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9c1b96e3 AK |
1 | The Definitive KVM (Kernel-based Virtual Machine) API Documentation |
2 | =================================================================== | |
3 | ||
4 | 1. General description | |
414fa985 | 5 | ---------------------- |
9c1b96e3 AK |
6 | |
7 | The kvm API is a set of ioctls that are issued to control various aspects | |
8 | of a virtual machine. The ioctls belong to three classes | |
9 | ||
10 | - System ioctls: These query and set global attributes which affect the | |
11 | whole kvm subsystem. In addition a system ioctl is used to create | |
12 | virtual machines | |
13 | ||
14 | - VM ioctls: These query and set attributes that affect an entire virtual | |
15 | machine, for example memory layout. In addition a VM ioctl is used to | |
16 | create virtual cpus (vcpus). | |
17 | ||
18 | Only run VM ioctls from the same process (address space) that was used | |
19 | to create the VM. | |
20 | ||
21 | - vcpu ioctls: These query and set attributes that control the operation | |
22 | of a single virtual cpu. | |
23 | ||
24 | Only run vcpu ioctls from the same thread that was used to create the | |
25 | vcpu. | |
26 | ||
414fa985 | 27 | |
2044892d | 28 | 2. File descriptors |
414fa985 | 29 | ------------------- |
9c1b96e3 AK |
30 | |
31 | The kvm API is centered around file descriptors. An initial | |
32 | open("/dev/kvm") obtains a handle to the kvm subsystem; this handle | |
33 | can be used to issue system ioctls. A KVM_CREATE_VM ioctl on this | |
2044892d | 34 | handle will create a VM file descriptor which can be used to issue VM |
9c1b96e3 AK |
35 | ioctls. A KVM_CREATE_VCPU ioctl on a VM fd will create a virtual cpu |
36 | and return a file descriptor pointing to it. Finally, ioctls on a vcpu | |
37 | fd can be used to control the vcpu, including the important task of | |
38 | actually running guest code. | |
39 | ||
40 | In general file descriptors can be migrated among processes by means | |
41 | of fork() and the SCM_RIGHTS facility of unix domain socket. These | |
42 | kinds of tricks are explicitly not supported by kvm. While they will | |
43 | not cause harm to the host, their actual behavior is not guaranteed by | |
44 | the API. The only supported use is one virtual machine per process, | |
45 | and one vcpu per thread. | |
46 | ||
414fa985 | 47 | |
9c1b96e3 | 48 | 3. Extensions |
414fa985 | 49 | ------------- |
9c1b96e3 AK |
50 | |
51 | As of Linux 2.6.22, the KVM ABI has been stabilized: no backward | |
52 | incompatible change are allowed. However, there is an extension | |
53 | facility that allows backward-compatible extensions to the API to be | |
54 | queried and used. | |
55 | ||
c9f3f2d8 | 56 | The extension mechanism is not based on the Linux version number. |
9c1b96e3 AK |
57 | Instead, kvm defines extension identifiers and a facility to query |
58 | whether a particular extension identifier is available. If it is, a | |
59 | set of ioctls is available for application use. | |
60 | ||
414fa985 | 61 | |
9c1b96e3 | 62 | 4. API description |
414fa985 | 63 | ------------------ |
9c1b96e3 AK |
64 | |
65 | This section describes ioctls that can be used to control kvm guests. | |
66 | For each ioctl, the following information is provided along with a | |
67 | description: | |
68 | ||
69 | Capability: which KVM extension provides this ioctl. Can be 'basic', | |
70 | which means that is will be provided by any kernel that supports | |
7f05db6a | 71 | API version 12 (see section 4.1), a KVM_CAP_xyz constant, which |
9c1b96e3 | 72 | means availability needs to be checked with KVM_CHECK_EXTENSION |
7f05db6a MT |
73 | (see section 4.4), or 'none' which means that while not all kernels |
74 | support this ioctl, there's no capability bit to check its | |
75 | availability: for kernels that don't support the ioctl, | |
76 | the ioctl returns -ENOTTY. | |
9c1b96e3 AK |
77 | |
78 | Architectures: which instruction set architectures provide this ioctl. | |
79 | x86 includes both i386 and x86_64. | |
80 | ||
81 | Type: system, vm, or vcpu. | |
82 | ||
83 | Parameters: what parameters are accepted by the ioctl. | |
84 | ||
85 | Returns: the return value. General error numbers (EBADF, ENOMEM, EINVAL) | |
86 | are not detailed, but errors with specific meanings are. | |
87 | ||
414fa985 | 88 | |
9c1b96e3 AK |
89 | 4.1 KVM_GET_API_VERSION |
90 | ||
91 | Capability: basic | |
92 | Architectures: all | |
93 | Type: system ioctl | |
94 | Parameters: none | |
95 | Returns: the constant KVM_API_VERSION (=12) | |
96 | ||
97 | This identifies the API version as the stable kvm API. It is not | |
98 | expected that this number will change. However, Linux 2.6.20 and | |
99 | 2.6.21 report earlier versions; these are not documented and not | |
100 | supported. Applications should refuse to run if KVM_GET_API_VERSION | |
101 | returns a value other than 12. If this check passes, all ioctls | |
102 | described as 'basic' will be available. | |
103 | ||
414fa985 | 104 | |
9c1b96e3 AK |
105 | 4.2 KVM_CREATE_VM |
106 | ||
107 | Capability: basic | |
108 | Architectures: all | |
109 | Type: system ioctl | |
e08b9637 | 110 | Parameters: machine type identifier (KVM_VM_*) |
9c1b96e3 AK |
111 | Returns: a VM fd that can be used to control the new virtual machine. |
112 | ||
113 | The new VM has no virtual cpus and no memory. An mmap() of a VM fd | |
114 | will access the virtual machine's physical address space; offset zero | |
115 | corresponds to guest physical address zero. Use of mmap() on a VM fd | |
116 | is discouraged if userspace memory allocation (KVM_CAP_USER_MEMORY) is | |
117 | available. | |
e08b9637 CO |
118 | You most certainly want to use 0 as machine type. |
119 | ||
120 | In order to create user controlled virtual machines on S390, check | |
121 | KVM_CAP_S390_UCONTROL and use the flag KVM_VM_S390_UCONTROL as | |
122 | privileged user (CAP_SYS_ADMIN). | |
9c1b96e3 | 123 | |
414fa985 | 124 | |
9c1b96e3 AK |
125 | 4.3 KVM_GET_MSR_INDEX_LIST |
126 | ||
127 | Capability: basic | |
128 | Architectures: x86 | |
129 | Type: system | |
130 | Parameters: struct kvm_msr_list (in/out) | |
131 | Returns: 0 on success; -1 on error | |
132 | Errors: | |
133 | E2BIG: the msr index list is to be to fit in the array specified by | |
134 | the user. | |
135 | ||
136 | struct kvm_msr_list { | |
137 | __u32 nmsrs; /* number of msrs in entries */ | |
138 | __u32 indices[0]; | |
139 | }; | |
140 | ||
141 | This ioctl returns the guest msrs that are supported. The list varies | |
142 | by kvm version and host processor, but does not change otherwise. The | |
143 | user fills in the size of the indices array in nmsrs, and in return | |
144 | kvm adjusts nmsrs to reflect the actual number of msrs and fills in | |
145 | the indices array with their numbers. | |
146 | ||
2e2602ca AK |
147 | Note: if kvm indicates supports MCE (KVM_CAP_MCE), then the MCE bank MSRs are |
148 | not returned in the MSR list, as different vcpus can have a different number | |
149 | of banks, as set via the KVM_X86_SETUP_MCE ioctl. | |
150 | ||
414fa985 | 151 | |
9c1b96e3 AK |
152 | 4.4 KVM_CHECK_EXTENSION |
153 | ||
92b591a4 | 154 | Capability: basic, KVM_CAP_CHECK_EXTENSION_VM for vm ioctl |
9c1b96e3 | 155 | Architectures: all |
92b591a4 | 156 | Type: system ioctl, vm ioctl |
9c1b96e3 AK |
157 | Parameters: extension identifier (KVM_CAP_*) |
158 | Returns: 0 if unsupported; 1 (or some other positive integer) if supported | |
159 | ||
160 | The API allows the application to query about extensions to the core | |
161 | kvm API. Userspace passes an extension identifier (an integer) and | |
162 | receives an integer that describes the extension availability. | |
163 | Generally 0 means no and 1 means yes, but some extensions may report | |
164 | additional information in the integer return value. | |
165 | ||
92b591a4 AG |
166 | Based on their initialization different VMs may have different capabilities. |
167 | It is thus encouraged to use the vm ioctl to query for capabilities (available | |
168 | with KVM_CAP_CHECK_EXTENSION_VM on the vm fd) | |
414fa985 | 169 | |
9c1b96e3 AK |
170 | 4.5 KVM_GET_VCPU_MMAP_SIZE |
171 | ||
172 | Capability: basic | |
173 | Architectures: all | |
174 | Type: system ioctl | |
175 | Parameters: none | |
176 | Returns: size of vcpu mmap area, in bytes | |
177 | ||
178 | The KVM_RUN ioctl (cf.) communicates with userspace via a shared | |
179 | memory region. This ioctl returns the size of that region. See the | |
180 | KVM_RUN documentation for details. | |
181 | ||
414fa985 | 182 | |
9c1b96e3 AK |
183 | 4.6 KVM_SET_MEMORY_REGION |
184 | ||
185 | Capability: basic | |
186 | Architectures: all | |
187 | Type: vm ioctl | |
188 | Parameters: struct kvm_memory_region (in) | |
189 | Returns: 0 on success, -1 on error | |
190 | ||
b74a07be | 191 | This ioctl is obsolete and has been removed. |
9c1b96e3 | 192 | |
414fa985 | 193 | |
68ba6974 | 194 | 4.7 KVM_CREATE_VCPU |
9c1b96e3 AK |
195 | |
196 | Capability: basic | |
197 | Architectures: all | |
198 | Type: vm ioctl | |
199 | Parameters: vcpu id (apic id on x86) | |
200 | Returns: vcpu fd on success, -1 on error | |
201 | ||
0b1b1dfd GK |
202 | This API adds a vcpu to a virtual machine. No more than max_vcpus may be added. |
203 | The vcpu id is an integer in the range [0, max_vcpu_id). | |
8c3ba334 SL |
204 | |
205 | The recommended max_vcpus value can be retrieved using the KVM_CAP_NR_VCPUS of | |
206 | the KVM_CHECK_EXTENSION ioctl() at run-time. | |
207 | The maximum possible value for max_vcpus can be retrieved using the | |
208 | KVM_CAP_MAX_VCPUS of the KVM_CHECK_EXTENSION ioctl() at run-time. | |
209 | ||
76d25402 PE |
210 | If the KVM_CAP_NR_VCPUS does not exist, you should assume that max_vcpus is 4 |
211 | cpus max. | |
8c3ba334 SL |
212 | If the KVM_CAP_MAX_VCPUS does not exist, you should assume that max_vcpus is |
213 | same as the value returned from KVM_CAP_NR_VCPUS. | |
9c1b96e3 | 214 | |
0b1b1dfd GK |
215 | The maximum possible value for max_vcpu_id can be retrieved using the |
216 | KVM_CAP_MAX_VCPU_ID of the KVM_CHECK_EXTENSION ioctl() at run-time. | |
217 | ||
218 | If the KVM_CAP_MAX_VCPU_ID does not exist, you should assume that max_vcpu_id | |
219 | is the same as the value returned from KVM_CAP_MAX_VCPUS. | |
220 | ||
371fefd6 PM |
221 | On powerpc using book3s_hv mode, the vcpus are mapped onto virtual |
222 | threads in one or more virtual CPU cores. (This is because the | |
223 | hardware requires all the hardware threads in a CPU core to be in the | |
224 | same partition.) The KVM_CAP_PPC_SMT capability indicates the number | |
36442687 AK |
225 | of vcpus per virtual core (vcore). The vcore id is obtained by |
226 | dividing the vcpu id by the number of vcpus per vcore. The vcpus in a | |
227 | given vcore will always be in the same physical core as each other | |
228 | (though that might be a different physical core from time to time). | |
229 | Userspace can control the threading (SMT) mode of the guest by its | |
230 | allocation of vcpu ids. For example, if userspace wants | |
231 | single-threaded guest vcpus, it should make all vcpu ids be a multiple | |
232 | of the number of vcpus per vcore. | |
233 | ||
5b1c1493 CO |
234 | For virtual cpus that have been created with S390 user controlled virtual |
235 | machines, the resulting vcpu fd can be memory mapped at page offset | |
236 | KVM_S390_SIE_PAGE_OFFSET in order to obtain a memory map of the virtual | |
237 | cpu's hardware control block. | |
238 | ||
414fa985 | 239 | |
68ba6974 | 240 | 4.8 KVM_GET_DIRTY_LOG (vm ioctl) |
9c1b96e3 AK |
241 | |
242 | Capability: basic | |
243 | Architectures: x86 | |
244 | Type: vm ioctl | |
245 | Parameters: struct kvm_dirty_log (in/out) | |
246 | Returns: 0 on success, -1 on error | |
247 | ||
248 | /* for KVM_GET_DIRTY_LOG */ | |
249 | struct kvm_dirty_log { | |
250 | __u32 slot; | |
251 | __u32 padding; | |
252 | union { | |
253 | void __user *dirty_bitmap; /* one bit per page */ | |
254 | __u64 padding; | |
255 | }; | |
256 | }; | |
257 | ||
258 | Given a memory slot, return a bitmap containing any pages dirtied | |
259 | since the last call to this ioctl. Bit 0 is the first page in the | |
260 | memory slot. Ensure the entire structure is cleared to avoid padding | |
261 | issues. | |
262 | ||
f481b069 PB |
263 | If KVM_CAP_MULTI_ADDRESS_SPACE is available, bits 16-31 specifies |
264 | the address space for which you want to return the dirty bitmap. | |
265 | They must be less than the value that KVM_CHECK_EXTENSION returns for | |
266 | the KVM_CAP_MULTI_ADDRESS_SPACE capability. | |
267 | ||
414fa985 | 268 | |
68ba6974 | 269 | 4.9 KVM_SET_MEMORY_ALIAS |
9c1b96e3 AK |
270 | |
271 | Capability: basic | |
272 | Architectures: x86 | |
273 | Type: vm ioctl | |
274 | Parameters: struct kvm_memory_alias (in) | |
275 | Returns: 0 (success), -1 (error) | |
276 | ||
a1f4d395 | 277 | This ioctl is obsolete and has been removed. |
9c1b96e3 | 278 | |
414fa985 | 279 | |
68ba6974 | 280 | 4.10 KVM_RUN |
9c1b96e3 AK |
281 | |
282 | Capability: basic | |
283 | Architectures: all | |
284 | Type: vcpu ioctl | |
285 | Parameters: none | |
286 | Returns: 0 on success, -1 on error | |
287 | Errors: | |
288 | EINTR: an unmasked signal is pending | |
289 | ||
290 | This ioctl is used to run a guest virtual cpu. While there are no | |
291 | explicit parameters, there is an implicit parameter block that can be | |
292 | obtained by mmap()ing the vcpu fd at offset 0, with the size given by | |
293 | KVM_GET_VCPU_MMAP_SIZE. The parameter block is formatted as a 'struct | |
294 | kvm_run' (see below). | |
295 | ||
414fa985 | 296 | |
68ba6974 | 297 | 4.11 KVM_GET_REGS |
9c1b96e3 AK |
298 | |
299 | Capability: basic | |
379e04c7 | 300 | Architectures: all except ARM, arm64 |
9c1b96e3 AK |
301 | Type: vcpu ioctl |
302 | Parameters: struct kvm_regs (out) | |
303 | Returns: 0 on success, -1 on error | |
304 | ||
305 | Reads the general purpose registers from the vcpu. | |
306 | ||
307 | /* x86 */ | |
308 | struct kvm_regs { | |
309 | /* out (KVM_GET_REGS) / in (KVM_SET_REGS) */ | |
310 | __u64 rax, rbx, rcx, rdx; | |
311 | __u64 rsi, rdi, rsp, rbp; | |
312 | __u64 r8, r9, r10, r11; | |
313 | __u64 r12, r13, r14, r15; | |
314 | __u64 rip, rflags; | |
315 | }; | |
316 | ||
c2d2c21b JH |
317 | /* mips */ |
318 | struct kvm_regs { | |
319 | /* out (KVM_GET_REGS) / in (KVM_SET_REGS) */ | |
320 | __u64 gpr[32]; | |
321 | __u64 hi; | |
322 | __u64 lo; | |
323 | __u64 pc; | |
324 | }; | |
325 | ||
414fa985 | 326 | |
68ba6974 | 327 | 4.12 KVM_SET_REGS |
9c1b96e3 AK |
328 | |
329 | Capability: basic | |
379e04c7 | 330 | Architectures: all except ARM, arm64 |
9c1b96e3 AK |
331 | Type: vcpu ioctl |
332 | Parameters: struct kvm_regs (in) | |
333 | Returns: 0 on success, -1 on error | |
334 | ||
335 | Writes the general purpose registers into the vcpu. | |
336 | ||
337 | See KVM_GET_REGS for the data structure. | |
338 | ||
414fa985 | 339 | |
68ba6974 | 340 | 4.13 KVM_GET_SREGS |
9c1b96e3 AK |
341 | |
342 | Capability: basic | |
5ce941ee | 343 | Architectures: x86, ppc |
9c1b96e3 AK |
344 | Type: vcpu ioctl |
345 | Parameters: struct kvm_sregs (out) | |
346 | Returns: 0 on success, -1 on error | |
347 | ||
348 | Reads special registers from the vcpu. | |
349 | ||
350 | /* x86 */ | |
351 | struct kvm_sregs { | |
352 | struct kvm_segment cs, ds, es, fs, gs, ss; | |
353 | struct kvm_segment tr, ldt; | |
354 | struct kvm_dtable gdt, idt; | |
355 | __u64 cr0, cr2, cr3, cr4, cr8; | |
356 | __u64 efer; | |
357 | __u64 apic_base; | |
358 | __u64 interrupt_bitmap[(KVM_NR_INTERRUPTS + 63) / 64]; | |
359 | }; | |
360 | ||
68e2ffed | 361 | /* ppc -- see arch/powerpc/include/uapi/asm/kvm.h */ |
5ce941ee | 362 | |
9c1b96e3 AK |
363 | interrupt_bitmap is a bitmap of pending external interrupts. At most |
364 | one bit may be set. This interrupt has been acknowledged by the APIC | |
365 | but not yet injected into the cpu core. | |
366 | ||
414fa985 | 367 | |
68ba6974 | 368 | 4.14 KVM_SET_SREGS |
9c1b96e3 AK |
369 | |
370 | Capability: basic | |
5ce941ee | 371 | Architectures: x86, ppc |
9c1b96e3 AK |
372 | Type: vcpu ioctl |
373 | Parameters: struct kvm_sregs (in) | |
374 | Returns: 0 on success, -1 on error | |
375 | ||
376 | Writes special registers into the vcpu. See KVM_GET_SREGS for the | |
377 | data structures. | |
378 | ||
414fa985 | 379 | |
68ba6974 | 380 | 4.15 KVM_TRANSLATE |
9c1b96e3 AK |
381 | |
382 | Capability: basic | |
383 | Architectures: x86 | |
384 | Type: vcpu ioctl | |
385 | Parameters: struct kvm_translation (in/out) | |
386 | Returns: 0 on success, -1 on error | |
387 | ||
388 | Translates a virtual address according to the vcpu's current address | |
389 | translation mode. | |
390 | ||
391 | struct kvm_translation { | |
392 | /* in */ | |
393 | __u64 linear_address; | |
394 | ||
395 | /* out */ | |
396 | __u64 physical_address; | |
397 | __u8 valid; | |
398 | __u8 writeable; | |
399 | __u8 usermode; | |
400 | __u8 pad[5]; | |
401 | }; | |
402 | ||
414fa985 | 403 | |
68ba6974 | 404 | 4.16 KVM_INTERRUPT |
9c1b96e3 AK |
405 | |
406 | Capability: basic | |
c2d2c21b | 407 | Architectures: x86, ppc, mips |
9c1b96e3 AK |
408 | Type: vcpu ioctl |
409 | Parameters: struct kvm_interrupt (in) | |
1c1a9ce9 | 410 | Returns: 0 on success, negative on failure. |
9c1b96e3 | 411 | |
1c1a9ce9 | 412 | Queues a hardware interrupt vector to be injected. |
9c1b96e3 AK |
413 | |
414 | /* for KVM_INTERRUPT */ | |
415 | struct kvm_interrupt { | |
416 | /* in */ | |
417 | __u32 irq; | |
418 | }; | |
419 | ||
6f7a2bd4 AG |
420 | X86: |
421 | ||
1c1a9ce9 SR |
422 | Returns: 0 on success, |
423 | -EEXIST if an interrupt is already enqueued | |
424 | -EINVAL the the irq number is invalid | |
425 | -ENXIO if the PIC is in the kernel | |
426 | -EFAULT if the pointer is invalid | |
427 | ||
428 | Note 'irq' is an interrupt vector, not an interrupt pin or line. This | |
429 | ioctl is useful if the in-kernel PIC is not used. | |
9c1b96e3 | 430 | |
6f7a2bd4 AG |
431 | PPC: |
432 | ||
433 | Queues an external interrupt to be injected. This ioctl is overleaded | |
434 | with 3 different irq values: | |
435 | ||
436 | a) KVM_INTERRUPT_SET | |
437 | ||
438 | This injects an edge type external interrupt into the guest once it's ready | |
439 | to receive interrupts. When injected, the interrupt is done. | |
440 | ||
441 | b) KVM_INTERRUPT_UNSET | |
442 | ||
443 | This unsets any pending interrupt. | |
444 | ||
445 | Only available with KVM_CAP_PPC_UNSET_IRQ. | |
446 | ||
447 | c) KVM_INTERRUPT_SET_LEVEL | |
448 | ||
449 | This injects a level type external interrupt into the guest context. The | |
450 | interrupt stays pending until a specific ioctl with KVM_INTERRUPT_UNSET | |
451 | is triggered. | |
452 | ||
453 | Only available with KVM_CAP_PPC_IRQ_LEVEL. | |
454 | ||
455 | Note that any value for 'irq' other than the ones stated above is invalid | |
456 | and incurs unexpected behavior. | |
457 | ||
c2d2c21b JH |
458 | MIPS: |
459 | ||
460 | Queues an external interrupt to be injected into the virtual CPU. A negative | |
461 | interrupt number dequeues the interrupt. | |
462 | ||
414fa985 | 463 | |
68ba6974 | 464 | 4.17 KVM_DEBUG_GUEST |
9c1b96e3 AK |
465 | |
466 | Capability: basic | |
467 | Architectures: none | |
468 | Type: vcpu ioctl | |
469 | Parameters: none) | |
470 | Returns: -1 on error | |
471 | ||
472 | Support for this has been removed. Use KVM_SET_GUEST_DEBUG instead. | |
473 | ||
414fa985 | 474 | |
68ba6974 | 475 | 4.18 KVM_GET_MSRS |
9c1b96e3 AK |
476 | |
477 | Capability: basic | |
478 | Architectures: x86 | |
479 | Type: vcpu ioctl | |
480 | Parameters: struct kvm_msrs (in/out) | |
481 | Returns: 0 on success, -1 on error | |
482 | ||
483 | Reads model-specific registers from the vcpu. Supported msr indices can | |
484 | be obtained using KVM_GET_MSR_INDEX_LIST. | |
485 | ||
486 | struct kvm_msrs { | |
487 | __u32 nmsrs; /* number of msrs in entries */ | |
488 | __u32 pad; | |
489 | ||
490 | struct kvm_msr_entry entries[0]; | |
491 | }; | |
492 | ||
493 | struct kvm_msr_entry { | |
494 | __u32 index; | |
495 | __u32 reserved; | |
496 | __u64 data; | |
497 | }; | |
498 | ||
499 | Application code should set the 'nmsrs' member (which indicates the | |
500 | size of the entries array) and the 'index' member of each array entry. | |
501 | kvm will fill in the 'data' member. | |
502 | ||
414fa985 | 503 | |
68ba6974 | 504 | 4.19 KVM_SET_MSRS |
9c1b96e3 AK |
505 | |
506 | Capability: basic | |
507 | Architectures: x86 | |
508 | Type: vcpu ioctl | |
509 | Parameters: struct kvm_msrs (in) | |
510 | Returns: 0 on success, -1 on error | |
511 | ||
512 | Writes model-specific registers to the vcpu. See KVM_GET_MSRS for the | |
513 | data structures. | |
514 | ||
515 | Application code should set the 'nmsrs' member (which indicates the | |
516 | size of the entries array), and the 'index' and 'data' members of each | |
517 | array entry. | |
518 | ||
414fa985 | 519 | |
68ba6974 | 520 | 4.20 KVM_SET_CPUID |
9c1b96e3 AK |
521 | |
522 | Capability: basic | |
523 | Architectures: x86 | |
524 | Type: vcpu ioctl | |
525 | Parameters: struct kvm_cpuid (in) | |
526 | Returns: 0 on success, -1 on error | |
527 | ||
528 | Defines the vcpu responses to the cpuid instruction. Applications | |
529 | should use the KVM_SET_CPUID2 ioctl if available. | |
530 | ||
531 | ||
532 | struct kvm_cpuid_entry { | |
533 | __u32 function; | |
534 | __u32 eax; | |
535 | __u32 ebx; | |
536 | __u32 ecx; | |
537 | __u32 edx; | |
538 | __u32 padding; | |
539 | }; | |
540 | ||
541 | /* for KVM_SET_CPUID */ | |
542 | struct kvm_cpuid { | |
543 | __u32 nent; | |
544 | __u32 padding; | |
545 | struct kvm_cpuid_entry entries[0]; | |
546 | }; | |
547 | ||
414fa985 | 548 | |
68ba6974 | 549 | 4.21 KVM_SET_SIGNAL_MASK |
9c1b96e3 AK |
550 | |
551 | Capability: basic | |
572e0929 | 552 | Architectures: all |
9c1b96e3 AK |
553 | Type: vcpu ioctl |
554 | Parameters: struct kvm_signal_mask (in) | |
555 | Returns: 0 on success, -1 on error | |
556 | ||
557 | Defines which signals are blocked during execution of KVM_RUN. This | |
558 | signal mask temporarily overrides the threads signal mask. Any | |
559 | unblocked signal received (except SIGKILL and SIGSTOP, which retain | |
560 | their traditional behaviour) will cause KVM_RUN to return with -EINTR. | |
561 | ||
562 | Note the signal will only be delivered if not blocked by the original | |
563 | signal mask. | |
564 | ||
565 | /* for KVM_SET_SIGNAL_MASK */ | |
566 | struct kvm_signal_mask { | |
567 | __u32 len; | |
568 | __u8 sigset[0]; | |
569 | }; | |
570 | ||
414fa985 | 571 | |
68ba6974 | 572 | 4.22 KVM_GET_FPU |
9c1b96e3 AK |
573 | |
574 | Capability: basic | |
575 | Architectures: x86 | |
576 | Type: vcpu ioctl | |
577 | Parameters: struct kvm_fpu (out) | |
578 | Returns: 0 on success, -1 on error | |
579 | ||
580 | Reads the floating point state from the vcpu. | |
581 | ||
582 | /* for KVM_GET_FPU and KVM_SET_FPU */ | |
583 | struct kvm_fpu { | |
584 | __u8 fpr[8][16]; | |
585 | __u16 fcw; | |
586 | __u16 fsw; | |
587 | __u8 ftwx; /* in fxsave format */ | |
588 | __u8 pad1; | |
589 | __u16 last_opcode; | |
590 | __u64 last_ip; | |
591 | __u64 last_dp; | |
592 | __u8 xmm[16][16]; | |
593 | __u32 mxcsr; | |
594 | __u32 pad2; | |
595 | }; | |
596 | ||
414fa985 | 597 | |
68ba6974 | 598 | 4.23 KVM_SET_FPU |
9c1b96e3 AK |
599 | |
600 | Capability: basic | |
601 | Architectures: x86 | |
602 | Type: vcpu ioctl | |
603 | Parameters: struct kvm_fpu (in) | |
604 | Returns: 0 on success, -1 on error | |
605 | ||
606 | Writes the floating point state to the vcpu. | |
607 | ||
608 | /* for KVM_GET_FPU and KVM_SET_FPU */ | |
609 | struct kvm_fpu { | |
610 | __u8 fpr[8][16]; | |
611 | __u16 fcw; | |
612 | __u16 fsw; | |
613 | __u8 ftwx; /* in fxsave format */ | |
614 | __u8 pad1; | |
615 | __u16 last_opcode; | |
616 | __u64 last_ip; | |
617 | __u64 last_dp; | |
618 | __u8 xmm[16][16]; | |
619 | __u32 mxcsr; | |
620 | __u32 pad2; | |
621 | }; | |
622 | ||
414fa985 | 623 | |
68ba6974 | 624 | 4.24 KVM_CREATE_IRQCHIP |
5dadbfd6 | 625 | |
84223598 | 626 | Capability: KVM_CAP_IRQCHIP, KVM_CAP_S390_IRQCHIP (s390) |
c32a4272 | 627 | Architectures: x86, ARM, arm64, s390 |
5dadbfd6 AK |
628 | Type: vm ioctl |
629 | Parameters: none | |
630 | Returns: 0 on success, -1 on error | |
631 | ||
ac3d3735 AP |
632 | Creates an interrupt controller model in the kernel. |
633 | On x86, creates a virtual ioapic, a virtual PIC (two PICs, nested), and sets up | |
634 | future vcpus to have a local APIC. IRQ routing for GSIs 0-15 is set to both | |
635 | PIC and IOAPIC; GSI 16-23 only go to the IOAPIC. | |
636 | On ARM/arm64, a GICv2 is created. Any other GIC versions require the usage of | |
637 | KVM_CREATE_DEVICE, which also supports creating a GICv2. Using | |
638 | KVM_CREATE_DEVICE is preferred over KVM_CREATE_IRQCHIP for GICv2. | |
639 | On s390, a dummy irq routing table is created. | |
84223598 CH |
640 | |
641 | Note that on s390 the KVM_CAP_S390_IRQCHIP vm capability needs to be enabled | |
642 | before KVM_CREATE_IRQCHIP can be used. | |
5dadbfd6 | 643 | |
414fa985 | 644 | |
68ba6974 | 645 | 4.25 KVM_IRQ_LINE |
5dadbfd6 AK |
646 | |
647 | Capability: KVM_CAP_IRQCHIP | |
c32a4272 | 648 | Architectures: x86, arm, arm64 |
5dadbfd6 AK |
649 | Type: vm ioctl |
650 | Parameters: struct kvm_irq_level | |
651 | Returns: 0 on success, -1 on error | |
652 | ||
653 | Sets the level of a GSI input to the interrupt controller model in the kernel. | |
86ce8535 CD |
654 | On some architectures it is required that an interrupt controller model has |
655 | been previously created with KVM_CREATE_IRQCHIP. Note that edge-triggered | |
656 | interrupts require the level to be set to 1 and then back to 0. | |
657 | ||
100943c5 GS |
658 | On real hardware, interrupt pins can be active-low or active-high. This |
659 | does not matter for the level field of struct kvm_irq_level: 1 always | |
660 | means active (asserted), 0 means inactive (deasserted). | |
661 | ||
662 | x86 allows the operating system to program the interrupt polarity | |
663 | (active-low/active-high) for level-triggered interrupts, and KVM used | |
664 | to consider the polarity. However, due to bitrot in the handling of | |
665 | active-low interrupts, the above convention is now valid on x86 too. | |
666 | This is signaled by KVM_CAP_X86_IOAPIC_POLARITY_IGNORED. Userspace | |
667 | should not present interrupts to the guest as active-low unless this | |
668 | capability is present (or unless it is not using the in-kernel irqchip, | |
669 | of course). | |
670 | ||
671 | ||
379e04c7 MZ |
672 | ARM/arm64 can signal an interrupt either at the CPU level, or at the |
673 | in-kernel irqchip (GIC), and for in-kernel irqchip can tell the GIC to | |
674 | use PPIs designated for specific cpus. The irq field is interpreted | |
675 | like this: | |
86ce8535 CD |
676 | |
677 | bits: | 31 ... 24 | 23 ... 16 | 15 ... 0 | | |
678 | field: | irq_type | vcpu_index | irq_id | | |
679 | ||
680 | The irq_type field has the following values: | |
681 | - irq_type[0]: out-of-kernel GIC: irq_id 0 is IRQ, irq_id 1 is FIQ | |
682 | - irq_type[1]: in-kernel GIC: SPI, irq_id between 32 and 1019 (incl.) | |
683 | (the vcpu_index field is ignored) | |
684 | - irq_type[2]: in-kernel GIC: PPI, irq_id between 16 and 31 (incl.) | |
685 | ||
686 | (The irq_id field thus corresponds nicely to the IRQ ID in the ARM GIC specs) | |
687 | ||
100943c5 | 688 | In both cases, level is used to assert/deassert the line. |
5dadbfd6 AK |
689 | |
690 | struct kvm_irq_level { | |
691 | union { | |
692 | __u32 irq; /* GSI */ | |
693 | __s32 status; /* not used for KVM_IRQ_LEVEL */ | |
694 | }; | |
695 | __u32 level; /* 0 or 1 */ | |
696 | }; | |
697 | ||
414fa985 | 698 | |
68ba6974 | 699 | 4.26 KVM_GET_IRQCHIP |
5dadbfd6 AK |
700 | |
701 | Capability: KVM_CAP_IRQCHIP | |
c32a4272 | 702 | Architectures: x86 |
5dadbfd6 AK |
703 | Type: vm ioctl |
704 | Parameters: struct kvm_irqchip (in/out) | |
705 | Returns: 0 on success, -1 on error | |
706 | ||
707 | Reads the state of a kernel interrupt controller created with | |
708 | KVM_CREATE_IRQCHIP into a buffer provided by the caller. | |
709 | ||
710 | struct kvm_irqchip { | |
711 | __u32 chip_id; /* 0 = PIC1, 1 = PIC2, 2 = IOAPIC */ | |
712 | __u32 pad; | |
713 | union { | |
714 | char dummy[512]; /* reserving space */ | |
715 | struct kvm_pic_state pic; | |
716 | struct kvm_ioapic_state ioapic; | |
717 | } chip; | |
718 | }; | |
719 | ||
414fa985 | 720 | |
68ba6974 | 721 | 4.27 KVM_SET_IRQCHIP |
5dadbfd6 AK |
722 | |
723 | Capability: KVM_CAP_IRQCHIP | |
c32a4272 | 724 | Architectures: x86 |
5dadbfd6 AK |
725 | Type: vm ioctl |
726 | Parameters: struct kvm_irqchip (in) | |
727 | Returns: 0 on success, -1 on error | |
728 | ||
729 | Sets the state of a kernel interrupt controller created with | |
730 | KVM_CREATE_IRQCHIP from a buffer provided by the caller. | |
731 | ||
732 | struct kvm_irqchip { | |
733 | __u32 chip_id; /* 0 = PIC1, 1 = PIC2, 2 = IOAPIC */ | |
734 | __u32 pad; | |
735 | union { | |
736 | char dummy[512]; /* reserving space */ | |
737 | struct kvm_pic_state pic; | |
738 | struct kvm_ioapic_state ioapic; | |
739 | } chip; | |
740 | }; | |
741 | ||
414fa985 | 742 | |
68ba6974 | 743 | 4.28 KVM_XEN_HVM_CONFIG |
ffde22ac ES |
744 | |
745 | Capability: KVM_CAP_XEN_HVM | |
746 | Architectures: x86 | |
747 | Type: vm ioctl | |
748 | Parameters: struct kvm_xen_hvm_config (in) | |
749 | Returns: 0 on success, -1 on error | |
750 | ||
751 | Sets the MSR that the Xen HVM guest uses to initialize its hypercall | |
752 | page, and provides the starting address and size of the hypercall | |
753 | blobs in userspace. When the guest writes the MSR, kvm copies one | |
754 | page of a blob (32- or 64-bit, depending on the vcpu mode) to guest | |
755 | memory. | |
756 | ||
757 | struct kvm_xen_hvm_config { | |
758 | __u32 flags; | |
759 | __u32 msr; | |
760 | __u64 blob_addr_32; | |
761 | __u64 blob_addr_64; | |
762 | __u8 blob_size_32; | |
763 | __u8 blob_size_64; | |
764 | __u8 pad2[30]; | |
765 | }; | |
766 | ||
414fa985 | 767 | |
68ba6974 | 768 | 4.29 KVM_GET_CLOCK |
afbcf7ab GC |
769 | |
770 | Capability: KVM_CAP_ADJUST_CLOCK | |
771 | Architectures: x86 | |
772 | Type: vm ioctl | |
773 | Parameters: struct kvm_clock_data (out) | |
774 | Returns: 0 on success, -1 on error | |
775 | ||
776 | Gets the current timestamp of kvmclock as seen by the current guest. In | |
777 | conjunction with KVM_SET_CLOCK, it is used to ensure monotonicity on scenarios | |
778 | such as migration. | |
779 | ||
780 | struct kvm_clock_data { | |
781 | __u64 clock; /* kvmclock current value */ | |
782 | __u32 flags; | |
783 | __u32 pad[9]; | |
784 | }; | |
785 | ||
414fa985 | 786 | |
68ba6974 | 787 | 4.30 KVM_SET_CLOCK |
afbcf7ab GC |
788 | |
789 | Capability: KVM_CAP_ADJUST_CLOCK | |
790 | Architectures: x86 | |
791 | Type: vm ioctl | |
792 | Parameters: struct kvm_clock_data (in) | |
793 | Returns: 0 on success, -1 on error | |
794 | ||
2044892d | 795 | Sets the current timestamp of kvmclock to the value specified in its parameter. |
afbcf7ab GC |
796 | In conjunction with KVM_GET_CLOCK, it is used to ensure monotonicity on scenarios |
797 | such as migration. | |
798 | ||
799 | struct kvm_clock_data { | |
800 | __u64 clock; /* kvmclock current value */ | |
801 | __u32 flags; | |
802 | __u32 pad[9]; | |
803 | }; | |
804 | ||
414fa985 | 805 | |
68ba6974 | 806 | 4.31 KVM_GET_VCPU_EVENTS |
3cfc3092 JK |
807 | |
808 | Capability: KVM_CAP_VCPU_EVENTS | |
48005f64 | 809 | Extended by: KVM_CAP_INTR_SHADOW |
3cfc3092 JK |
810 | Architectures: x86 |
811 | Type: vm ioctl | |
812 | Parameters: struct kvm_vcpu_event (out) | |
813 | Returns: 0 on success, -1 on error | |
814 | ||
815 | Gets currently pending exceptions, interrupts, and NMIs as well as related | |
816 | states of the vcpu. | |
817 | ||
818 | struct kvm_vcpu_events { | |
819 | struct { | |
820 | __u8 injected; | |
821 | __u8 nr; | |
822 | __u8 has_error_code; | |
823 | __u8 pad; | |
824 | __u32 error_code; | |
825 | } exception; | |
826 | struct { | |
827 | __u8 injected; | |
828 | __u8 nr; | |
829 | __u8 soft; | |
48005f64 | 830 | __u8 shadow; |
3cfc3092 JK |
831 | } interrupt; |
832 | struct { | |
833 | __u8 injected; | |
834 | __u8 pending; | |
835 | __u8 masked; | |
836 | __u8 pad; | |
837 | } nmi; | |
838 | __u32 sipi_vector; | |
dab4b911 | 839 | __u32 flags; |
f077825a PB |
840 | struct { |
841 | __u8 smm; | |
842 | __u8 pending; | |
843 | __u8 smm_inside_nmi; | |
844 | __u8 latched_init; | |
845 | } smi; | |
3cfc3092 JK |
846 | }; |
847 | ||
f077825a PB |
848 | Only two fields are defined in the flags field: |
849 | ||
850 | - KVM_VCPUEVENT_VALID_SHADOW may be set in the flags field to signal that | |
851 | interrupt.shadow contains a valid state. | |
48005f64 | 852 | |
f077825a PB |
853 | - KVM_VCPUEVENT_VALID_SMM may be set in the flags field to signal that |
854 | smi contains a valid state. | |
414fa985 | 855 | |
68ba6974 | 856 | 4.32 KVM_SET_VCPU_EVENTS |
3cfc3092 JK |
857 | |
858 | Capability: KVM_CAP_VCPU_EVENTS | |
48005f64 | 859 | Extended by: KVM_CAP_INTR_SHADOW |
3cfc3092 JK |
860 | Architectures: x86 |
861 | Type: vm ioctl | |
862 | Parameters: struct kvm_vcpu_event (in) | |
863 | Returns: 0 on success, -1 on error | |
864 | ||
865 | Set pending exceptions, interrupts, and NMIs as well as related states of the | |
866 | vcpu. | |
867 | ||
868 | See KVM_GET_VCPU_EVENTS for the data structure. | |
869 | ||
dab4b911 | 870 | Fields that may be modified asynchronously by running VCPUs can be excluded |
f077825a PB |
871 | from the update. These fields are nmi.pending, sipi_vector, smi.smm, |
872 | smi.pending. Keep the corresponding bits in the flags field cleared to | |
873 | suppress overwriting the current in-kernel state. The bits are: | |
dab4b911 JK |
874 | |
875 | KVM_VCPUEVENT_VALID_NMI_PENDING - transfer nmi.pending to the kernel | |
876 | KVM_VCPUEVENT_VALID_SIPI_VECTOR - transfer sipi_vector | |
f077825a | 877 | KVM_VCPUEVENT_VALID_SMM - transfer the smi sub-struct. |
dab4b911 | 878 | |
48005f64 JK |
879 | If KVM_CAP_INTR_SHADOW is available, KVM_VCPUEVENT_VALID_SHADOW can be set in |
880 | the flags field to signal that interrupt.shadow contains a valid state and | |
881 | shall be written into the VCPU. | |
882 | ||
f077825a PB |
883 | KVM_VCPUEVENT_VALID_SMM can only be set if KVM_CAP_X86_SMM is available. |
884 | ||
414fa985 | 885 | |
68ba6974 | 886 | 4.33 KVM_GET_DEBUGREGS |
a1efbe77 JK |
887 | |
888 | Capability: KVM_CAP_DEBUGREGS | |
889 | Architectures: x86 | |
890 | Type: vm ioctl | |
891 | Parameters: struct kvm_debugregs (out) | |
892 | Returns: 0 on success, -1 on error | |
893 | ||
894 | Reads debug registers from the vcpu. | |
895 | ||
896 | struct kvm_debugregs { | |
897 | __u64 db[4]; | |
898 | __u64 dr6; | |
899 | __u64 dr7; | |
900 | __u64 flags; | |
901 | __u64 reserved[9]; | |
902 | }; | |
903 | ||
414fa985 | 904 | |
68ba6974 | 905 | 4.34 KVM_SET_DEBUGREGS |
a1efbe77 JK |
906 | |
907 | Capability: KVM_CAP_DEBUGREGS | |
908 | Architectures: x86 | |
909 | Type: vm ioctl | |
910 | Parameters: struct kvm_debugregs (in) | |
911 | Returns: 0 on success, -1 on error | |
912 | ||
913 | Writes debug registers into the vcpu. | |
914 | ||
915 | See KVM_GET_DEBUGREGS for the data structure. The flags field is unused | |
916 | yet and must be cleared on entry. | |
917 | ||
414fa985 | 918 | |
68ba6974 | 919 | 4.35 KVM_SET_USER_MEMORY_REGION |
0f2d8f4d AK |
920 | |
921 | Capability: KVM_CAP_USER_MEM | |
922 | Architectures: all | |
923 | Type: vm ioctl | |
924 | Parameters: struct kvm_userspace_memory_region (in) | |
925 | Returns: 0 on success, -1 on error | |
926 | ||
927 | struct kvm_userspace_memory_region { | |
928 | __u32 slot; | |
929 | __u32 flags; | |
930 | __u64 guest_phys_addr; | |
931 | __u64 memory_size; /* bytes */ | |
932 | __u64 userspace_addr; /* start of the userspace allocated memory */ | |
933 | }; | |
934 | ||
935 | /* for kvm_memory_region::flags */ | |
4d8b81ab XG |
936 | #define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0) |
937 | #define KVM_MEM_READONLY (1UL << 1) | |
0f2d8f4d AK |
938 | |
939 | This ioctl allows the user to create or modify a guest physical memory | |
940 | slot. When changing an existing slot, it may be moved in the guest | |
941 | physical memory space, or its flags may be modified. It may not be | |
942 | resized. Slots may not overlap in guest physical address space. | |
943 | ||
f481b069 PB |
944 | If KVM_CAP_MULTI_ADDRESS_SPACE is available, bits 16-31 of "slot" |
945 | specifies the address space which is being modified. They must be | |
946 | less than the value that KVM_CHECK_EXTENSION returns for the | |
947 | KVM_CAP_MULTI_ADDRESS_SPACE capability. Slots in separate address spaces | |
948 | are unrelated; the restriction on overlapping slots only applies within | |
949 | each address space. | |
950 | ||
0f2d8f4d AK |
951 | Memory for the region is taken starting at the address denoted by the |
952 | field userspace_addr, which must point at user addressable memory for | |
953 | the entire memory slot size. Any object may back this memory, including | |
954 | anonymous memory, ordinary files, and hugetlbfs. | |
955 | ||
956 | It is recommended that the lower 21 bits of guest_phys_addr and userspace_addr | |
957 | be identical. This allows large pages in the guest to be backed by large | |
958 | pages in the host. | |
959 | ||
75d61fbc TY |
960 | The flags field supports two flags: KVM_MEM_LOG_DIRTY_PAGES and |
961 | KVM_MEM_READONLY. The former can be set to instruct KVM to keep track of | |
962 | writes to memory within the slot. See KVM_GET_DIRTY_LOG ioctl to know how to | |
963 | use it. The latter can be set, if KVM_CAP_READONLY_MEM capability allows it, | |
964 | to make a new slot read-only. In this case, writes to this memory will be | |
965 | posted to userspace as KVM_EXIT_MMIO exits. | |
7efd8fa1 JK |
966 | |
967 | When the KVM_CAP_SYNC_MMU capability is available, changes in the backing of | |
968 | the memory region are automatically reflected into the guest. For example, an | |
969 | mmap() that affects the region will be made visible immediately. Another | |
970 | example is madvise(MADV_DROP). | |
0f2d8f4d AK |
971 | |
972 | It is recommended to use this API instead of the KVM_SET_MEMORY_REGION ioctl. | |
973 | The KVM_SET_MEMORY_REGION does not allow fine grained control over memory | |
974 | allocation and is deprecated. | |
3cfc3092 | 975 | |
414fa985 | 976 | |
68ba6974 | 977 | 4.36 KVM_SET_TSS_ADDR |
8a5416db AK |
978 | |
979 | Capability: KVM_CAP_SET_TSS_ADDR | |
980 | Architectures: x86 | |
981 | Type: vm ioctl | |
982 | Parameters: unsigned long tss_address (in) | |
983 | Returns: 0 on success, -1 on error | |
984 | ||
985 | This ioctl defines the physical address of a three-page region in the guest | |
986 | physical address space. The region must be within the first 4GB of the | |
987 | guest physical address space and must not conflict with any memory slot | |
988 | or any mmio address. The guest may malfunction if it accesses this memory | |
989 | region. | |
990 | ||
991 | This ioctl is required on Intel-based hosts. This is needed on Intel hardware | |
992 | because of a quirk in the virtualization implementation (see the internals | |
993 | documentation when it pops into existence). | |
994 | ||
414fa985 | 995 | |
68ba6974 | 996 | 4.37 KVM_ENABLE_CAP |
71fbfd5f | 997 | |
d938dc55 | 998 | Capability: KVM_CAP_ENABLE_CAP, KVM_CAP_ENABLE_CAP_VM |
90de4a18 NA |
999 | Architectures: x86 (only KVM_CAP_ENABLE_CAP_VM), |
1000 | mips (only KVM_CAP_ENABLE_CAP), ppc, s390 | |
d938dc55 | 1001 | Type: vcpu ioctl, vm ioctl (with KVM_CAP_ENABLE_CAP_VM) |
71fbfd5f AG |
1002 | Parameters: struct kvm_enable_cap (in) |
1003 | Returns: 0 on success; -1 on error | |
1004 | ||
1005 | +Not all extensions are enabled by default. Using this ioctl the application | |
1006 | can enable an extension, making it available to the guest. | |
1007 | ||
1008 | On systems that do not support this ioctl, it always fails. On systems that | |
1009 | do support it, it only works for extensions that are supported for enablement. | |
1010 | ||
1011 | To check if a capability can be enabled, the KVM_CHECK_EXTENSION ioctl should | |
1012 | be used. | |
1013 | ||
1014 | struct kvm_enable_cap { | |
1015 | /* in */ | |
1016 | __u32 cap; | |
1017 | ||
1018 | The capability that is supposed to get enabled. | |
1019 | ||
1020 | __u32 flags; | |
1021 | ||
1022 | A bitfield indicating future enhancements. Has to be 0 for now. | |
1023 | ||
1024 | __u64 args[4]; | |
1025 | ||
1026 | Arguments for enabling a feature. If a feature needs initial values to | |
1027 | function properly, this is the place to put them. | |
1028 | ||
1029 | __u8 pad[64]; | |
1030 | }; | |
1031 | ||
d938dc55 CH |
1032 | The vcpu ioctl should be used for vcpu-specific capabilities, the vm ioctl |
1033 | for vm-wide capabilities. | |
414fa985 | 1034 | |
68ba6974 | 1035 | 4.38 KVM_GET_MP_STATE |
b843f065 AK |
1036 | |
1037 | Capability: KVM_CAP_MP_STATE | |
ecccf0cc | 1038 | Architectures: x86, s390, arm, arm64 |
b843f065 AK |
1039 | Type: vcpu ioctl |
1040 | Parameters: struct kvm_mp_state (out) | |
1041 | Returns: 0 on success; -1 on error | |
1042 | ||
1043 | struct kvm_mp_state { | |
1044 | __u32 mp_state; | |
1045 | }; | |
1046 | ||
1047 | Returns the vcpu's current "multiprocessing state" (though also valid on | |
1048 | uniprocessor guests). | |
1049 | ||
1050 | Possible values are: | |
1051 | ||
ecccf0cc | 1052 | - KVM_MP_STATE_RUNNABLE: the vcpu is currently running [x86,arm/arm64] |
b843f065 | 1053 | - KVM_MP_STATE_UNINITIALIZED: the vcpu is an application processor (AP) |
c32a4272 | 1054 | which has not yet received an INIT signal [x86] |
b843f065 | 1055 | - KVM_MP_STATE_INIT_RECEIVED: the vcpu has received an INIT signal, and is |
c32a4272 | 1056 | now ready for a SIPI [x86] |
b843f065 | 1057 | - KVM_MP_STATE_HALTED: the vcpu has executed a HLT instruction and |
c32a4272 | 1058 | is waiting for an interrupt [x86] |
b843f065 | 1059 | - KVM_MP_STATE_SIPI_RECEIVED: the vcpu has just received a SIPI (vector |
c32a4272 | 1060 | accessible via KVM_GET_VCPU_EVENTS) [x86] |
ecccf0cc | 1061 | - KVM_MP_STATE_STOPPED: the vcpu is stopped [s390,arm/arm64] |
6352e4d2 DH |
1062 | - KVM_MP_STATE_CHECK_STOP: the vcpu is in a special error state [s390] |
1063 | - KVM_MP_STATE_OPERATING: the vcpu is operating (running or halted) | |
1064 | [s390] | |
1065 | - KVM_MP_STATE_LOAD: the vcpu is in a special load/startup state | |
1066 | [s390] | |
b843f065 | 1067 | |
c32a4272 | 1068 | On x86, this ioctl is only useful after KVM_CREATE_IRQCHIP. Without an |
0b4820d6 DH |
1069 | in-kernel irqchip, the multiprocessing state must be maintained by userspace on |
1070 | these architectures. | |
b843f065 | 1071 | |
ecccf0cc AB |
1072 | For arm/arm64: |
1073 | ||
1074 | The only states that are valid are KVM_MP_STATE_STOPPED and | |
1075 | KVM_MP_STATE_RUNNABLE which reflect if the vcpu is paused or not. | |
414fa985 | 1076 | |
68ba6974 | 1077 | 4.39 KVM_SET_MP_STATE |
b843f065 AK |
1078 | |
1079 | Capability: KVM_CAP_MP_STATE | |
ecccf0cc | 1080 | Architectures: x86, s390, arm, arm64 |
b843f065 AK |
1081 | Type: vcpu ioctl |
1082 | Parameters: struct kvm_mp_state (in) | |
1083 | Returns: 0 on success; -1 on error | |
1084 | ||
1085 | Sets the vcpu's current "multiprocessing state"; see KVM_GET_MP_STATE for | |
1086 | arguments. | |
1087 | ||
c32a4272 | 1088 | On x86, this ioctl is only useful after KVM_CREATE_IRQCHIP. Without an |
0b4820d6 DH |
1089 | in-kernel irqchip, the multiprocessing state must be maintained by userspace on |
1090 | these architectures. | |
b843f065 | 1091 | |
ecccf0cc AB |
1092 | For arm/arm64: |
1093 | ||
1094 | The only states that are valid are KVM_MP_STATE_STOPPED and | |
1095 | KVM_MP_STATE_RUNNABLE which reflect if the vcpu should be paused or not. | |
414fa985 | 1096 | |
68ba6974 | 1097 | 4.40 KVM_SET_IDENTITY_MAP_ADDR |
47dbb84f AK |
1098 | |
1099 | Capability: KVM_CAP_SET_IDENTITY_MAP_ADDR | |
1100 | Architectures: x86 | |
1101 | Type: vm ioctl | |
1102 | Parameters: unsigned long identity (in) | |
1103 | Returns: 0 on success, -1 on error | |
1104 | ||
1105 | This ioctl defines the physical address of a one-page region in the guest | |
1106 | physical address space. The region must be within the first 4GB of the | |
1107 | guest physical address space and must not conflict with any memory slot | |
1108 | or any mmio address. The guest may malfunction if it accesses this memory | |
1109 | region. | |
1110 | ||
1111 | This ioctl is required on Intel-based hosts. This is needed on Intel hardware | |
1112 | because of a quirk in the virtualization implementation (see the internals | |
1113 | documentation when it pops into existence). | |
1114 | ||
414fa985 | 1115 | |
68ba6974 | 1116 | 4.41 KVM_SET_BOOT_CPU_ID |
57bc24cf AK |
1117 | |
1118 | Capability: KVM_CAP_SET_BOOT_CPU_ID | |
c32a4272 | 1119 | Architectures: x86 |
57bc24cf AK |
1120 | Type: vm ioctl |
1121 | Parameters: unsigned long vcpu_id | |
1122 | Returns: 0 on success, -1 on error | |
1123 | ||
1124 | Define which vcpu is the Bootstrap Processor (BSP). Values are the same | |
1125 | as the vcpu id in KVM_CREATE_VCPU. If this ioctl is not called, the default | |
1126 | is vcpu 0. | |
1127 | ||
414fa985 | 1128 | |
68ba6974 | 1129 | 4.42 KVM_GET_XSAVE |
2d5b5a66 SY |
1130 | |
1131 | Capability: KVM_CAP_XSAVE | |
1132 | Architectures: x86 | |
1133 | Type: vcpu ioctl | |
1134 | Parameters: struct kvm_xsave (out) | |
1135 | Returns: 0 on success, -1 on error | |
1136 | ||
1137 | struct kvm_xsave { | |
1138 | __u32 region[1024]; | |
1139 | }; | |
1140 | ||
1141 | This ioctl would copy current vcpu's xsave struct to the userspace. | |
1142 | ||
414fa985 | 1143 | |
68ba6974 | 1144 | 4.43 KVM_SET_XSAVE |
2d5b5a66 SY |
1145 | |
1146 | Capability: KVM_CAP_XSAVE | |
1147 | Architectures: x86 | |
1148 | Type: vcpu ioctl | |
1149 | Parameters: struct kvm_xsave (in) | |
1150 | Returns: 0 on success, -1 on error | |
1151 | ||
1152 | struct kvm_xsave { | |
1153 | __u32 region[1024]; | |
1154 | }; | |
1155 | ||
1156 | This ioctl would copy userspace's xsave struct to the kernel. | |
1157 | ||
414fa985 | 1158 | |
68ba6974 | 1159 | 4.44 KVM_GET_XCRS |
2d5b5a66 SY |
1160 | |
1161 | Capability: KVM_CAP_XCRS | |
1162 | Architectures: x86 | |
1163 | Type: vcpu ioctl | |
1164 | Parameters: struct kvm_xcrs (out) | |
1165 | Returns: 0 on success, -1 on error | |
1166 | ||
1167 | struct kvm_xcr { | |
1168 | __u32 xcr; | |
1169 | __u32 reserved; | |
1170 | __u64 value; | |
1171 | }; | |
1172 | ||
1173 | struct kvm_xcrs { | |
1174 | __u32 nr_xcrs; | |
1175 | __u32 flags; | |
1176 | struct kvm_xcr xcrs[KVM_MAX_XCRS]; | |
1177 | __u64 padding[16]; | |
1178 | }; | |
1179 | ||
1180 | This ioctl would copy current vcpu's xcrs to the userspace. | |
1181 | ||
414fa985 | 1182 | |
68ba6974 | 1183 | 4.45 KVM_SET_XCRS |
2d5b5a66 SY |
1184 | |
1185 | Capability: KVM_CAP_XCRS | |
1186 | Architectures: x86 | |
1187 | Type: vcpu ioctl | |
1188 | Parameters: struct kvm_xcrs (in) | |
1189 | Returns: 0 on success, -1 on error | |
1190 | ||
1191 | struct kvm_xcr { | |
1192 | __u32 xcr; | |
1193 | __u32 reserved; | |
1194 | __u64 value; | |
1195 | }; | |
1196 | ||
1197 | struct kvm_xcrs { | |
1198 | __u32 nr_xcrs; | |
1199 | __u32 flags; | |
1200 | struct kvm_xcr xcrs[KVM_MAX_XCRS]; | |
1201 | __u64 padding[16]; | |
1202 | }; | |
1203 | ||
1204 | This ioctl would set vcpu's xcr to the value userspace specified. | |
1205 | ||
414fa985 | 1206 | |
68ba6974 | 1207 | 4.46 KVM_GET_SUPPORTED_CPUID |
d153513d AK |
1208 | |
1209 | Capability: KVM_CAP_EXT_CPUID | |
1210 | Architectures: x86 | |
1211 | Type: system ioctl | |
1212 | Parameters: struct kvm_cpuid2 (in/out) | |
1213 | Returns: 0 on success, -1 on error | |
1214 | ||
1215 | struct kvm_cpuid2 { | |
1216 | __u32 nent; | |
1217 | __u32 padding; | |
1218 | struct kvm_cpuid_entry2 entries[0]; | |
1219 | }; | |
1220 | ||
9c15bb1d BP |
1221 | #define KVM_CPUID_FLAG_SIGNIFCANT_INDEX BIT(0) |
1222 | #define KVM_CPUID_FLAG_STATEFUL_FUNC BIT(1) | |
1223 | #define KVM_CPUID_FLAG_STATE_READ_NEXT BIT(2) | |
d153513d AK |
1224 | |
1225 | struct kvm_cpuid_entry2 { | |
1226 | __u32 function; | |
1227 | __u32 index; | |
1228 | __u32 flags; | |
1229 | __u32 eax; | |
1230 | __u32 ebx; | |
1231 | __u32 ecx; | |
1232 | __u32 edx; | |
1233 | __u32 padding[3]; | |
1234 | }; | |
1235 | ||
1236 | This ioctl returns x86 cpuid features which are supported by both the hardware | |
1237 | and kvm. Userspace can use the information returned by this ioctl to | |
1238 | construct cpuid information (for KVM_SET_CPUID2) that is consistent with | |
1239 | hardware, kernel, and userspace capabilities, and with user requirements (for | |
1240 | example, the user may wish to constrain cpuid to emulate older hardware, | |
1241 | or for feature consistency across a cluster). | |
1242 | ||
1243 | Userspace invokes KVM_GET_SUPPORTED_CPUID by passing a kvm_cpuid2 structure | |
1244 | with the 'nent' field indicating the number of entries in the variable-size | |
1245 | array 'entries'. If the number of entries is too low to describe the cpu | |
1246 | capabilities, an error (E2BIG) is returned. If the number is too high, | |
1247 | the 'nent' field is adjusted and an error (ENOMEM) is returned. If the | |
1248 | number is just right, the 'nent' field is adjusted to the number of valid | |
1249 | entries in the 'entries' array, which is then filled. | |
1250 | ||
1251 | The entries returned are the host cpuid as returned by the cpuid instruction, | |
c39cbd2a AK |
1252 | with unknown or unsupported features masked out. Some features (for example, |
1253 | x2apic), may not be present in the host cpu, but are exposed by kvm if it can | |
1254 | emulate them efficiently. The fields in each entry are defined as follows: | |
d153513d AK |
1255 | |
1256 | function: the eax value used to obtain the entry | |
1257 | index: the ecx value used to obtain the entry (for entries that are | |
1258 | affected by ecx) | |
1259 | flags: an OR of zero or more of the following: | |
1260 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX: | |
1261 | if the index field is valid | |
1262 | KVM_CPUID_FLAG_STATEFUL_FUNC: | |
1263 | if cpuid for this function returns different values for successive | |
1264 | invocations; there will be several entries with the same function, | |
1265 | all with this flag set | |
1266 | KVM_CPUID_FLAG_STATE_READ_NEXT: | |
1267 | for KVM_CPUID_FLAG_STATEFUL_FUNC entries, set if this entry is | |
1268 | the first entry to be read by a cpu | |
1269 | eax, ebx, ecx, edx: the values returned by the cpuid instruction for | |
1270 | this function/index combination | |
1271 | ||
4d25a066 JK |
1272 | The TSC deadline timer feature (CPUID leaf 1, ecx[24]) is always returned |
1273 | as false, since the feature depends on KVM_CREATE_IRQCHIP for local APIC | |
1274 | support. Instead it is reported via | |
1275 | ||
1276 | ioctl(KVM_CHECK_EXTENSION, KVM_CAP_TSC_DEADLINE_TIMER) | |
1277 | ||
1278 | if that returns true and you use KVM_CREATE_IRQCHIP, or if you emulate the | |
1279 | feature in userspace, then you can enable the feature for KVM_SET_CPUID2. | |
1280 | ||
414fa985 | 1281 | |
68ba6974 | 1282 | 4.47 KVM_PPC_GET_PVINFO |
15711e9c AG |
1283 | |
1284 | Capability: KVM_CAP_PPC_GET_PVINFO | |
1285 | Architectures: ppc | |
1286 | Type: vm ioctl | |
1287 | Parameters: struct kvm_ppc_pvinfo (out) | |
1288 | Returns: 0 on success, !0 on error | |
1289 | ||
1290 | struct kvm_ppc_pvinfo { | |
1291 | __u32 flags; | |
1292 | __u32 hcall[4]; | |
1293 | __u8 pad[108]; | |
1294 | }; | |
1295 | ||
1296 | This ioctl fetches PV specific information that need to be passed to the guest | |
1297 | using the device tree or other means from vm context. | |
1298 | ||
9202e076 | 1299 | The hcall array defines 4 instructions that make up a hypercall. |
15711e9c AG |
1300 | |
1301 | If any additional field gets added to this structure later on, a bit for that | |
1302 | additional piece of information will be set in the flags bitmap. | |
1303 | ||
9202e076 LYB |
1304 | The flags bitmap is defined as: |
1305 | ||
1306 | /* the host supports the ePAPR idle hcall | |
1307 | #define KVM_PPC_PVINFO_FLAGS_EV_IDLE (1<<0) | |
414fa985 | 1308 | |
e80a4a94 | 1309 | 4.48 KVM_ASSIGN_PCI_DEVICE (deprecated) |
49f48172 | 1310 | |
7f05db6a | 1311 | Capability: none |
c32a4272 | 1312 | Architectures: x86 |
49f48172 JK |
1313 | Type: vm ioctl |
1314 | Parameters: struct kvm_assigned_pci_dev (in) | |
1315 | Returns: 0 on success, -1 on error | |
1316 | ||
1317 | Assigns a host PCI device to the VM. | |
1318 | ||
1319 | struct kvm_assigned_pci_dev { | |
1320 | __u32 assigned_dev_id; | |
1321 | __u32 busnr; | |
1322 | __u32 devfn; | |
1323 | __u32 flags; | |
1324 | __u32 segnr; | |
1325 | union { | |
1326 | __u32 reserved[11]; | |
1327 | }; | |
1328 | }; | |
1329 | ||
1330 | The PCI device is specified by the triple segnr, busnr, and devfn. | |
1331 | Identification in succeeding service requests is done via assigned_dev_id. The | |
1332 | following flags are specified: | |
1333 | ||
1334 | /* Depends on KVM_CAP_IOMMU */ | |
1335 | #define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0) | |
07700a94 JK |
1336 | /* The following two depend on KVM_CAP_PCI_2_3 */ |
1337 | #define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1) | |
1338 | #define KVM_DEV_ASSIGN_MASK_INTX (1 << 2) | |
1339 | ||
1340 | If KVM_DEV_ASSIGN_PCI_2_3 is set, the kernel will manage legacy INTx interrupts | |
1341 | via the PCI-2.3-compliant device-level mask, thus enable IRQ sharing with other | |
1342 | assigned devices or host devices. KVM_DEV_ASSIGN_MASK_INTX specifies the | |
1343 | guest's view on the INTx mask, see KVM_ASSIGN_SET_INTX_MASK for details. | |
49f48172 | 1344 | |
42387373 AW |
1345 | The KVM_DEV_ASSIGN_ENABLE_IOMMU flag is a mandatory option to ensure |
1346 | isolation of the device. Usages not specifying this flag are deprecated. | |
1347 | ||
3d27e23b AW |
1348 | Only PCI header type 0 devices with PCI BAR resources are supported by |
1349 | device assignment. The user requesting this ioctl must have read/write | |
1350 | access to the PCI sysfs resource files associated with the device. | |
1351 | ||
7f05db6a MT |
1352 | Errors: |
1353 | ENOTTY: kernel does not support this ioctl | |
1354 | ||
1355 | Other error conditions may be defined by individual device types or | |
1356 | have their standard meanings. | |
1357 | ||
414fa985 | 1358 | |
e80a4a94 | 1359 | 4.49 KVM_DEASSIGN_PCI_DEVICE (deprecated) |
49f48172 | 1360 | |
7f05db6a | 1361 | Capability: none |
c32a4272 | 1362 | Architectures: x86 |
49f48172 JK |
1363 | Type: vm ioctl |
1364 | Parameters: struct kvm_assigned_pci_dev (in) | |
1365 | Returns: 0 on success, -1 on error | |
1366 | ||
1367 | Ends PCI device assignment, releasing all associated resources. | |
1368 | ||
7f05db6a | 1369 | See KVM_ASSIGN_PCI_DEVICE for the data structure. Only assigned_dev_id is |
49f48172 JK |
1370 | used in kvm_assigned_pci_dev to identify the device. |
1371 | ||
7f05db6a MT |
1372 | Errors: |
1373 | ENOTTY: kernel does not support this ioctl | |
1374 | ||
1375 | Other error conditions may be defined by individual device types or | |
1376 | have their standard meanings. | |
414fa985 | 1377 | |
e80a4a94 | 1378 | 4.50 KVM_ASSIGN_DEV_IRQ (deprecated) |
49f48172 JK |
1379 | |
1380 | Capability: KVM_CAP_ASSIGN_DEV_IRQ | |
c32a4272 | 1381 | Architectures: x86 |
49f48172 JK |
1382 | Type: vm ioctl |
1383 | Parameters: struct kvm_assigned_irq (in) | |
1384 | Returns: 0 on success, -1 on error | |
1385 | ||
1386 | Assigns an IRQ to a passed-through device. | |
1387 | ||
1388 | struct kvm_assigned_irq { | |
1389 | __u32 assigned_dev_id; | |
91e3d71d | 1390 | __u32 host_irq; /* ignored (legacy field) */ |
49f48172 JK |
1391 | __u32 guest_irq; |
1392 | __u32 flags; | |
1393 | union { | |
49f48172 JK |
1394 | __u32 reserved[12]; |
1395 | }; | |
1396 | }; | |
1397 | ||
1398 | The following flags are defined: | |
1399 | ||
1400 | #define KVM_DEV_IRQ_HOST_INTX (1 << 0) | |
1401 | #define KVM_DEV_IRQ_HOST_MSI (1 << 1) | |
1402 | #define KVM_DEV_IRQ_HOST_MSIX (1 << 2) | |
1403 | ||
1404 | #define KVM_DEV_IRQ_GUEST_INTX (1 << 8) | |
1405 | #define KVM_DEV_IRQ_GUEST_MSI (1 << 9) | |
1406 | #define KVM_DEV_IRQ_GUEST_MSIX (1 << 10) | |
1407 | ||
1408 | It is not valid to specify multiple types per host or guest IRQ. However, the | |
1409 | IRQ type of host and guest can differ or can even be null. | |
1410 | ||
7f05db6a MT |
1411 | Errors: |
1412 | ENOTTY: kernel does not support this ioctl | |
1413 | ||
1414 | Other error conditions may be defined by individual device types or | |
1415 | have their standard meanings. | |
1416 | ||
414fa985 | 1417 | |
e80a4a94 | 1418 | 4.51 KVM_DEASSIGN_DEV_IRQ (deprecated) |
49f48172 JK |
1419 | |
1420 | Capability: KVM_CAP_ASSIGN_DEV_IRQ | |
c32a4272 | 1421 | Architectures: x86 |
49f48172 JK |
1422 | Type: vm ioctl |
1423 | Parameters: struct kvm_assigned_irq (in) | |
1424 | Returns: 0 on success, -1 on error | |
1425 | ||
1426 | Ends an IRQ assignment to a passed-through device. | |
1427 | ||
1428 | See KVM_ASSIGN_DEV_IRQ for the data structure. The target device is specified | |
1429 | by assigned_dev_id, flags must correspond to the IRQ type specified on | |
1430 | KVM_ASSIGN_DEV_IRQ. Partial deassignment of host or guest IRQ is allowed. | |
1431 | ||
414fa985 | 1432 | |
68ba6974 | 1433 | 4.52 KVM_SET_GSI_ROUTING |
49f48172 JK |
1434 | |
1435 | Capability: KVM_CAP_IRQ_ROUTING | |
c32a4272 | 1436 | Architectures: x86 s390 |
49f48172 JK |
1437 | Type: vm ioctl |
1438 | Parameters: struct kvm_irq_routing (in) | |
1439 | Returns: 0 on success, -1 on error | |
1440 | ||
1441 | Sets the GSI routing table entries, overwriting any previously set entries. | |
1442 | ||
1443 | struct kvm_irq_routing { | |
1444 | __u32 nr; | |
1445 | __u32 flags; | |
1446 | struct kvm_irq_routing_entry entries[0]; | |
1447 | }; | |
1448 | ||
1449 | No flags are specified so far, the corresponding field must be set to zero. | |
1450 | ||
1451 | struct kvm_irq_routing_entry { | |
1452 | __u32 gsi; | |
1453 | __u32 type; | |
1454 | __u32 flags; | |
1455 | __u32 pad; | |
1456 | union { | |
1457 | struct kvm_irq_routing_irqchip irqchip; | |
1458 | struct kvm_irq_routing_msi msi; | |
84223598 | 1459 | struct kvm_irq_routing_s390_adapter adapter; |
5c919412 | 1460 | struct kvm_irq_routing_hv_sint hv_sint; |
49f48172 JK |
1461 | __u32 pad[8]; |
1462 | } u; | |
1463 | }; | |
1464 | ||
1465 | /* gsi routing entry types */ | |
1466 | #define KVM_IRQ_ROUTING_IRQCHIP 1 | |
1467 | #define KVM_IRQ_ROUTING_MSI 2 | |
84223598 | 1468 | #define KVM_IRQ_ROUTING_S390_ADAPTER 3 |
5c919412 | 1469 | #define KVM_IRQ_ROUTING_HV_SINT 4 |
49f48172 JK |
1470 | |
1471 | No flags are specified so far, the corresponding field must be set to zero. | |
1472 | ||
1473 | struct kvm_irq_routing_irqchip { | |
1474 | __u32 irqchip; | |
1475 | __u32 pin; | |
1476 | }; | |
1477 | ||
1478 | struct kvm_irq_routing_msi { | |
1479 | __u32 address_lo; | |
1480 | __u32 address_hi; | |
1481 | __u32 data; | |
1482 | __u32 pad; | |
1483 | }; | |
1484 | ||
84223598 CH |
1485 | struct kvm_irq_routing_s390_adapter { |
1486 | __u64 ind_addr; | |
1487 | __u64 summary_addr; | |
1488 | __u64 ind_offset; | |
1489 | __u32 summary_offset; | |
1490 | __u32 adapter_id; | |
1491 | }; | |
1492 | ||
5c919412 AS |
1493 | struct kvm_irq_routing_hv_sint { |
1494 | __u32 vcpu; | |
1495 | __u32 sint; | |
1496 | }; | |
414fa985 | 1497 | |
e80a4a94 | 1498 | 4.53 KVM_ASSIGN_SET_MSIX_NR (deprecated) |
49f48172 | 1499 | |
7f05db6a | 1500 | Capability: none |
c32a4272 | 1501 | Architectures: x86 |
49f48172 JK |
1502 | Type: vm ioctl |
1503 | Parameters: struct kvm_assigned_msix_nr (in) | |
1504 | Returns: 0 on success, -1 on error | |
1505 | ||
58f0964e JK |
1506 | Set the number of MSI-X interrupts for an assigned device. The number is |
1507 | reset again by terminating the MSI-X assignment of the device via | |
1508 | KVM_DEASSIGN_DEV_IRQ. Calling this service more than once at any earlier | |
1509 | point will fail. | |
49f48172 JK |
1510 | |
1511 | struct kvm_assigned_msix_nr { | |
1512 | __u32 assigned_dev_id; | |
1513 | __u16 entry_nr; | |
1514 | __u16 padding; | |
1515 | }; | |
1516 | ||
1517 | #define KVM_MAX_MSIX_PER_DEV 256 | |
1518 | ||
414fa985 | 1519 | |
e80a4a94 | 1520 | 4.54 KVM_ASSIGN_SET_MSIX_ENTRY (deprecated) |
49f48172 | 1521 | |
7f05db6a | 1522 | Capability: none |
c32a4272 | 1523 | Architectures: x86 |
49f48172 JK |
1524 | Type: vm ioctl |
1525 | Parameters: struct kvm_assigned_msix_entry (in) | |
1526 | Returns: 0 on success, -1 on error | |
1527 | ||
1528 | Specifies the routing of an MSI-X assigned device interrupt to a GSI. Setting | |
1529 | the GSI vector to zero means disabling the interrupt. | |
1530 | ||
1531 | struct kvm_assigned_msix_entry { | |
1532 | __u32 assigned_dev_id; | |
1533 | __u32 gsi; | |
1534 | __u16 entry; /* The index of entry in the MSI-X table */ | |
1535 | __u16 padding[3]; | |
1536 | }; | |
1537 | ||
7f05db6a MT |
1538 | Errors: |
1539 | ENOTTY: kernel does not support this ioctl | |
1540 | ||
1541 | Other error conditions may be defined by individual device types or | |
1542 | have their standard meanings. | |
1543 | ||
414fa985 JK |
1544 | |
1545 | 4.55 KVM_SET_TSC_KHZ | |
92a1f12d JR |
1546 | |
1547 | Capability: KVM_CAP_TSC_CONTROL | |
1548 | Architectures: x86 | |
1549 | Type: vcpu ioctl | |
1550 | Parameters: virtual tsc_khz | |
1551 | Returns: 0 on success, -1 on error | |
1552 | ||
1553 | Specifies the tsc frequency for the virtual machine. The unit of the | |
1554 | frequency is KHz. | |
1555 | ||
414fa985 JK |
1556 | |
1557 | 4.56 KVM_GET_TSC_KHZ | |
92a1f12d JR |
1558 | |
1559 | Capability: KVM_CAP_GET_TSC_KHZ | |
1560 | Architectures: x86 | |
1561 | Type: vcpu ioctl | |
1562 | Parameters: none | |
1563 | Returns: virtual tsc-khz on success, negative value on error | |
1564 | ||
1565 | Returns the tsc frequency of the guest. The unit of the return value is | |
1566 | KHz. If the host has unstable tsc this ioctl returns -EIO instead as an | |
1567 | error. | |
1568 | ||
414fa985 JK |
1569 | |
1570 | 4.57 KVM_GET_LAPIC | |
e7677933 AK |
1571 | |
1572 | Capability: KVM_CAP_IRQCHIP | |
1573 | Architectures: x86 | |
1574 | Type: vcpu ioctl | |
1575 | Parameters: struct kvm_lapic_state (out) | |
1576 | Returns: 0 on success, -1 on error | |
1577 | ||
1578 | #define KVM_APIC_REG_SIZE 0x400 | |
1579 | struct kvm_lapic_state { | |
1580 | char regs[KVM_APIC_REG_SIZE]; | |
1581 | }; | |
1582 | ||
1583 | Reads the Local APIC registers and copies them into the input argument. The | |
1584 | data format and layout are the same as documented in the architecture manual. | |
1585 | ||
414fa985 JK |
1586 | |
1587 | 4.58 KVM_SET_LAPIC | |
e7677933 AK |
1588 | |
1589 | Capability: KVM_CAP_IRQCHIP | |
1590 | Architectures: x86 | |
1591 | Type: vcpu ioctl | |
1592 | Parameters: struct kvm_lapic_state (in) | |
1593 | Returns: 0 on success, -1 on error | |
1594 | ||
1595 | #define KVM_APIC_REG_SIZE 0x400 | |
1596 | struct kvm_lapic_state { | |
1597 | char regs[KVM_APIC_REG_SIZE]; | |
1598 | }; | |
1599 | ||
df5cbb27 | 1600 | Copies the input argument into the Local APIC registers. The data format |
e7677933 AK |
1601 | and layout are the same as documented in the architecture manual. |
1602 | ||
414fa985 JK |
1603 | |
1604 | 4.59 KVM_IOEVENTFD | |
55399a02 SL |
1605 | |
1606 | Capability: KVM_CAP_IOEVENTFD | |
1607 | Architectures: all | |
1608 | Type: vm ioctl | |
1609 | Parameters: struct kvm_ioeventfd (in) | |
1610 | Returns: 0 on success, !0 on error | |
1611 | ||
1612 | This ioctl attaches or detaches an ioeventfd to a legal pio/mmio address | |
1613 | within the guest. A guest write in the registered address will signal the | |
1614 | provided event instead of triggering an exit. | |
1615 | ||
1616 | struct kvm_ioeventfd { | |
1617 | __u64 datamatch; | |
1618 | __u64 addr; /* legal pio/mmio address */ | |
e9ea5069 | 1619 | __u32 len; /* 0, 1, 2, 4, or 8 bytes */ |
55399a02 SL |
1620 | __s32 fd; |
1621 | __u32 flags; | |
1622 | __u8 pad[36]; | |
1623 | }; | |
1624 | ||
2b83451b CH |
1625 | For the special case of virtio-ccw devices on s390, the ioevent is matched |
1626 | to a subchannel/virtqueue tuple instead. | |
1627 | ||
55399a02 SL |
1628 | The following flags are defined: |
1629 | ||
1630 | #define KVM_IOEVENTFD_FLAG_DATAMATCH (1 << kvm_ioeventfd_flag_nr_datamatch) | |
1631 | #define KVM_IOEVENTFD_FLAG_PIO (1 << kvm_ioeventfd_flag_nr_pio) | |
1632 | #define KVM_IOEVENTFD_FLAG_DEASSIGN (1 << kvm_ioeventfd_flag_nr_deassign) | |
2b83451b CH |
1633 | #define KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY \ |
1634 | (1 << kvm_ioeventfd_flag_nr_virtio_ccw_notify) | |
55399a02 SL |
1635 | |
1636 | If datamatch flag is set, the event will be signaled only if the written value | |
1637 | to the registered address is equal to datamatch in struct kvm_ioeventfd. | |
1638 | ||
2b83451b CH |
1639 | For virtio-ccw devices, addr contains the subchannel id and datamatch the |
1640 | virtqueue index. | |
1641 | ||
e9ea5069 JW |
1642 | With KVM_CAP_IOEVENTFD_ANY_LENGTH, a zero length ioeventfd is allowed, and |
1643 | the kernel will ignore the length of guest write and may get a faster vmexit. | |
1644 | The speedup may only apply to specific architectures, but the ioeventfd will | |
1645 | work anyway. | |
414fa985 JK |
1646 | |
1647 | 4.60 KVM_DIRTY_TLB | |
dc83b8bc SW |
1648 | |
1649 | Capability: KVM_CAP_SW_TLB | |
1650 | Architectures: ppc | |
1651 | Type: vcpu ioctl | |
1652 | Parameters: struct kvm_dirty_tlb (in) | |
1653 | Returns: 0 on success, -1 on error | |
1654 | ||
1655 | struct kvm_dirty_tlb { | |
1656 | __u64 bitmap; | |
1657 | __u32 num_dirty; | |
1658 | }; | |
1659 | ||
1660 | This must be called whenever userspace has changed an entry in the shared | |
1661 | TLB, prior to calling KVM_RUN on the associated vcpu. | |
1662 | ||
1663 | The "bitmap" field is the userspace address of an array. This array | |
1664 | consists of a number of bits, equal to the total number of TLB entries as | |
1665 | determined by the last successful call to KVM_CONFIG_TLB, rounded up to the | |
1666 | nearest multiple of 64. | |
1667 | ||
1668 | Each bit corresponds to one TLB entry, ordered the same as in the shared TLB | |
1669 | array. | |
1670 | ||
1671 | The array is little-endian: the bit 0 is the least significant bit of the | |
1672 | first byte, bit 8 is the least significant bit of the second byte, etc. | |
1673 | This avoids any complications with differing word sizes. | |
1674 | ||
1675 | The "num_dirty" field is a performance hint for KVM to determine whether it | |
1676 | should skip processing the bitmap and just invalidate everything. It must | |
1677 | be set to the number of set bits in the bitmap. | |
1678 | ||
414fa985 | 1679 | |
e80a4a94 | 1680 | 4.61 KVM_ASSIGN_SET_INTX_MASK (deprecated) |
07700a94 JK |
1681 | |
1682 | Capability: KVM_CAP_PCI_2_3 | |
1683 | Architectures: x86 | |
1684 | Type: vm ioctl | |
1685 | Parameters: struct kvm_assigned_pci_dev (in) | |
1686 | Returns: 0 on success, -1 on error | |
1687 | ||
1688 | Allows userspace to mask PCI INTx interrupts from the assigned device. The | |
1689 | kernel will not deliver INTx interrupts to the guest between setting and | |
1690 | clearing of KVM_ASSIGN_SET_INTX_MASK via this interface. This enables use of | |
1691 | and emulation of PCI 2.3 INTx disable command register behavior. | |
1692 | ||
1693 | This may be used for both PCI 2.3 devices supporting INTx disable natively and | |
1694 | older devices lacking this support. Userspace is responsible for emulating the | |
1695 | read value of the INTx disable bit in the guest visible PCI command register. | |
1696 | When modifying the INTx disable state, userspace should precede updating the | |
1697 | physical device command register by calling this ioctl to inform the kernel of | |
1698 | the new intended INTx mask state. | |
1699 | ||
1700 | Note that the kernel uses the device INTx disable bit to internally manage the | |
1701 | device interrupt state for PCI 2.3 devices. Reads of this register may | |
1702 | therefore not match the expected value. Writes should always use the guest | |
1703 | intended INTx disable value rather than attempting to read-copy-update the | |
1704 | current physical device state. Races between user and kernel updates to the | |
1705 | INTx disable bit are handled lazily in the kernel. It's possible the device | |
1706 | may generate unintended interrupts, but they will not be injected into the | |
1707 | guest. | |
1708 | ||
1709 | See KVM_ASSIGN_DEV_IRQ for the data structure. The target device is specified | |
1710 | by assigned_dev_id. In the flags field, only KVM_DEV_ASSIGN_MASK_INTX is | |
1711 | evaluated. | |
1712 | ||
414fa985 | 1713 | |
54738c09 DG |
1714 | 4.62 KVM_CREATE_SPAPR_TCE |
1715 | ||
1716 | Capability: KVM_CAP_SPAPR_TCE | |
1717 | Architectures: powerpc | |
1718 | Type: vm ioctl | |
1719 | Parameters: struct kvm_create_spapr_tce (in) | |
1720 | Returns: file descriptor for manipulating the created TCE table | |
1721 | ||
1722 | This creates a virtual TCE (translation control entry) table, which | |
1723 | is an IOMMU for PAPR-style virtual I/O. It is used to translate | |
1724 | logical addresses used in virtual I/O into guest physical addresses, | |
1725 | and provides a scatter/gather capability for PAPR virtual I/O. | |
1726 | ||
1727 | /* for KVM_CAP_SPAPR_TCE */ | |
1728 | struct kvm_create_spapr_tce { | |
1729 | __u64 liobn; | |
1730 | __u32 window_size; | |
1731 | }; | |
1732 | ||
1733 | The liobn field gives the logical IO bus number for which to create a | |
1734 | TCE table. The window_size field specifies the size of the DMA window | |
1735 | which this TCE table will translate - the table will contain one 64 | |
1736 | bit TCE entry for every 4kiB of the DMA window. | |
1737 | ||
1738 | When the guest issues an H_PUT_TCE hcall on a liobn for which a TCE | |
1739 | table has been created using this ioctl(), the kernel will handle it | |
1740 | in real mode, updating the TCE table. H_PUT_TCE calls for other | |
1741 | liobns will cause a vm exit and must be handled by userspace. | |
1742 | ||
1743 | The return value is a file descriptor which can be passed to mmap(2) | |
1744 | to map the created TCE table into userspace. This lets userspace read | |
1745 | the entries written by kernel-handled H_PUT_TCE calls, and also lets | |
1746 | userspace update the TCE table directly which is useful in some | |
1747 | circumstances. | |
1748 | ||
414fa985 | 1749 | |
aa04b4cc PM |
1750 | 4.63 KVM_ALLOCATE_RMA |
1751 | ||
1752 | Capability: KVM_CAP_PPC_RMA | |
1753 | Architectures: powerpc | |
1754 | Type: vm ioctl | |
1755 | Parameters: struct kvm_allocate_rma (out) | |
1756 | Returns: file descriptor for mapping the allocated RMA | |
1757 | ||
1758 | This allocates a Real Mode Area (RMA) from the pool allocated at boot | |
1759 | time by the kernel. An RMA is a physically-contiguous, aligned region | |
1760 | of memory used on older POWER processors to provide the memory which | |
1761 | will be accessed by real-mode (MMU off) accesses in a KVM guest. | |
1762 | POWER processors support a set of sizes for the RMA that usually | |
1763 | includes 64MB, 128MB, 256MB and some larger powers of two. | |
1764 | ||
1765 | /* for KVM_ALLOCATE_RMA */ | |
1766 | struct kvm_allocate_rma { | |
1767 | __u64 rma_size; | |
1768 | }; | |
1769 | ||
1770 | The return value is a file descriptor which can be passed to mmap(2) | |
1771 | to map the allocated RMA into userspace. The mapped area can then be | |
1772 | passed to the KVM_SET_USER_MEMORY_REGION ioctl to establish it as the | |
1773 | RMA for a virtual machine. The size of the RMA in bytes (which is | |
1774 | fixed at host kernel boot time) is returned in the rma_size field of | |
1775 | the argument structure. | |
1776 | ||
1777 | The KVM_CAP_PPC_RMA capability is 1 or 2 if the KVM_ALLOCATE_RMA ioctl | |
1778 | is supported; 2 if the processor requires all virtual machines to have | |
1779 | an RMA, or 1 if the processor can use an RMA but doesn't require it, | |
1780 | because it supports the Virtual RMA (VRMA) facility. | |
1781 | ||
414fa985 | 1782 | |
3f745f1e AK |
1783 | 4.64 KVM_NMI |
1784 | ||
1785 | Capability: KVM_CAP_USER_NMI | |
1786 | Architectures: x86 | |
1787 | Type: vcpu ioctl | |
1788 | Parameters: none | |
1789 | Returns: 0 on success, -1 on error | |
1790 | ||
1791 | Queues an NMI on the thread's vcpu. Note this is well defined only | |
1792 | when KVM_CREATE_IRQCHIP has not been called, since this is an interface | |
1793 | between the virtual cpu core and virtual local APIC. After KVM_CREATE_IRQCHIP | |
1794 | has been called, this interface is completely emulated within the kernel. | |
1795 | ||
1796 | To use this to emulate the LINT1 input with KVM_CREATE_IRQCHIP, use the | |
1797 | following algorithm: | |
1798 | ||
5d4f6f3d | 1799 | - pause the vcpu |
3f745f1e AK |
1800 | - read the local APIC's state (KVM_GET_LAPIC) |
1801 | - check whether changing LINT1 will queue an NMI (see the LVT entry for LINT1) | |
1802 | - if so, issue KVM_NMI | |
1803 | - resume the vcpu | |
1804 | ||
1805 | Some guests configure the LINT1 NMI input to cause a panic, aiding in | |
1806 | debugging. | |
1807 | ||
414fa985 | 1808 | |
e24ed81f | 1809 | 4.65 KVM_S390_UCAS_MAP |
27e0393f CO |
1810 | |
1811 | Capability: KVM_CAP_S390_UCONTROL | |
1812 | Architectures: s390 | |
1813 | Type: vcpu ioctl | |
1814 | Parameters: struct kvm_s390_ucas_mapping (in) | |
1815 | Returns: 0 in case of success | |
1816 | ||
1817 | The parameter is defined like this: | |
1818 | struct kvm_s390_ucas_mapping { | |
1819 | __u64 user_addr; | |
1820 | __u64 vcpu_addr; | |
1821 | __u64 length; | |
1822 | }; | |
1823 | ||
1824 | This ioctl maps the memory at "user_addr" with the length "length" to | |
1825 | the vcpu's address space starting at "vcpu_addr". All parameters need to | |
f884ab15 | 1826 | be aligned by 1 megabyte. |
27e0393f | 1827 | |
414fa985 | 1828 | |
e24ed81f | 1829 | 4.66 KVM_S390_UCAS_UNMAP |
27e0393f CO |
1830 | |
1831 | Capability: KVM_CAP_S390_UCONTROL | |
1832 | Architectures: s390 | |
1833 | Type: vcpu ioctl | |
1834 | Parameters: struct kvm_s390_ucas_mapping (in) | |
1835 | Returns: 0 in case of success | |
1836 | ||
1837 | The parameter is defined like this: | |
1838 | struct kvm_s390_ucas_mapping { | |
1839 | __u64 user_addr; | |
1840 | __u64 vcpu_addr; | |
1841 | __u64 length; | |
1842 | }; | |
1843 | ||
1844 | This ioctl unmaps the memory in the vcpu's address space starting at | |
1845 | "vcpu_addr" with the length "length". The field "user_addr" is ignored. | |
f884ab15 | 1846 | All parameters need to be aligned by 1 megabyte. |
27e0393f | 1847 | |
414fa985 | 1848 | |
e24ed81f | 1849 | 4.67 KVM_S390_VCPU_FAULT |
ccc7910f CO |
1850 | |
1851 | Capability: KVM_CAP_S390_UCONTROL | |
1852 | Architectures: s390 | |
1853 | Type: vcpu ioctl | |
1854 | Parameters: vcpu absolute address (in) | |
1855 | Returns: 0 in case of success | |
1856 | ||
1857 | This call creates a page table entry on the virtual cpu's address space | |
1858 | (for user controlled virtual machines) or the virtual machine's address | |
1859 | space (for regular virtual machines). This only works for minor faults, | |
1860 | thus it's recommended to access subject memory page via the user page | |
1861 | table upfront. This is useful to handle validity intercepts for user | |
1862 | controlled virtual machines to fault in the virtual cpu's lowcore pages | |
1863 | prior to calling the KVM_RUN ioctl. | |
1864 | ||
414fa985 | 1865 | |
e24ed81f AG |
1866 | 4.68 KVM_SET_ONE_REG |
1867 | ||
1868 | Capability: KVM_CAP_ONE_REG | |
1869 | Architectures: all | |
1870 | Type: vcpu ioctl | |
1871 | Parameters: struct kvm_one_reg (in) | |
1872 | Returns: 0 on success, negative value on failure | |
1873 | ||
1874 | struct kvm_one_reg { | |
1875 | __u64 id; | |
1876 | __u64 addr; | |
1877 | }; | |
1878 | ||
1879 | Using this ioctl, a single vcpu register can be set to a specific value | |
1880 | defined by user space with the passed in struct kvm_one_reg, where id | |
1881 | refers to the register identifier as described below and addr is a pointer | |
1882 | to a variable with the respective size. There can be architecture agnostic | |
1883 | and architecture specific registers. Each have their own range of operation | |
1884 | and their own constants and width. To keep track of the implemented | |
1885 | registers, find a list below: | |
1886 | ||
bf5590f3 JH |
1887 | Arch | Register | Width (bits) |
1888 | | | | |
1889 | PPC | KVM_REG_PPC_HIOR | 64 | |
1890 | PPC | KVM_REG_PPC_IAC1 | 64 | |
1891 | PPC | KVM_REG_PPC_IAC2 | 64 | |
1892 | PPC | KVM_REG_PPC_IAC3 | 64 | |
1893 | PPC | KVM_REG_PPC_IAC4 | 64 | |
1894 | PPC | KVM_REG_PPC_DAC1 | 64 | |
1895 | PPC | KVM_REG_PPC_DAC2 | 64 | |
1896 | PPC | KVM_REG_PPC_DABR | 64 | |
1897 | PPC | KVM_REG_PPC_DSCR | 64 | |
1898 | PPC | KVM_REG_PPC_PURR | 64 | |
1899 | PPC | KVM_REG_PPC_SPURR | 64 | |
1900 | PPC | KVM_REG_PPC_DAR | 64 | |
1901 | PPC | KVM_REG_PPC_DSISR | 32 | |
1902 | PPC | KVM_REG_PPC_AMR | 64 | |
1903 | PPC | KVM_REG_PPC_UAMOR | 64 | |
1904 | PPC | KVM_REG_PPC_MMCR0 | 64 | |
1905 | PPC | KVM_REG_PPC_MMCR1 | 64 | |
1906 | PPC | KVM_REG_PPC_MMCRA | 64 | |
1907 | PPC | KVM_REG_PPC_MMCR2 | 64 | |
1908 | PPC | KVM_REG_PPC_MMCRS | 64 | |
1909 | PPC | KVM_REG_PPC_SIAR | 64 | |
1910 | PPC | KVM_REG_PPC_SDAR | 64 | |
1911 | PPC | KVM_REG_PPC_SIER | 64 | |
1912 | PPC | KVM_REG_PPC_PMC1 | 32 | |
1913 | PPC | KVM_REG_PPC_PMC2 | 32 | |
1914 | PPC | KVM_REG_PPC_PMC3 | 32 | |
1915 | PPC | KVM_REG_PPC_PMC4 | 32 | |
1916 | PPC | KVM_REG_PPC_PMC5 | 32 | |
1917 | PPC | KVM_REG_PPC_PMC6 | 32 | |
1918 | PPC | KVM_REG_PPC_PMC7 | 32 | |
1919 | PPC | KVM_REG_PPC_PMC8 | 32 | |
1920 | PPC | KVM_REG_PPC_FPR0 | 64 | |
a8bd19ef | 1921 | ... |
bf5590f3 JH |
1922 | PPC | KVM_REG_PPC_FPR31 | 64 |
1923 | PPC | KVM_REG_PPC_VR0 | 128 | |
a8bd19ef | 1924 | ... |
bf5590f3 JH |
1925 | PPC | KVM_REG_PPC_VR31 | 128 |
1926 | PPC | KVM_REG_PPC_VSR0 | 128 | |
a8bd19ef | 1927 | ... |
bf5590f3 JH |
1928 | PPC | KVM_REG_PPC_VSR31 | 128 |
1929 | PPC | KVM_REG_PPC_FPSCR | 64 | |
1930 | PPC | KVM_REG_PPC_VSCR | 32 | |
1931 | PPC | KVM_REG_PPC_VPA_ADDR | 64 | |
1932 | PPC | KVM_REG_PPC_VPA_SLB | 128 | |
1933 | PPC | KVM_REG_PPC_VPA_DTL | 128 | |
1934 | PPC | KVM_REG_PPC_EPCR | 32 | |
1935 | PPC | KVM_REG_PPC_EPR | 32 | |
1936 | PPC | KVM_REG_PPC_TCR | 32 | |
1937 | PPC | KVM_REG_PPC_TSR | 32 | |
1938 | PPC | KVM_REG_PPC_OR_TSR | 32 | |
1939 | PPC | KVM_REG_PPC_CLEAR_TSR | 32 | |
1940 | PPC | KVM_REG_PPC_MAS0 | 32 | |
1941 | PPC | KVM_REG_PPC_MAS1 | 32 | |
1942 | PPC | KVM_REG_PPC_MAS2 | 64 | |
1943 | PPC | KVM_REG_PPC_MAS7_3 | 64 | |
1944 | PPC | KVM_REG_PPC_MAS4 | 32 | |
1945 | PPC | KVM_REG_PPC_MAS6 | 32 | |
1946 | PPC | KVM_REG_PPC_MMUCFG | 32 | |
1947 | PPC | KVM_REG_PPC_TLB0CFG | 32 | |
1948 | PPC | KVM_REG_PPC_TLB1CFG | 32 | |
1949 | PPC | KVM_REG_PPC_TLB2CFG | 32 | |
1950 | PPC | KVM_REG_PPC_TLB3CFG | 32 | |
1951 | PPC | KVM_REG_PPC_TLB0PS | 32 | |
1952 | PPC | KVM_REG_PPC_TLB1PS | 32 | |
1953 | PPC | KVM_REG_PPC_TLB2PS | 32 | |
1954 | PPC | KVM_REG_PPC_TLB3PS | 32 | |
1955 | PPC | KVM_REG_PPC_EPTCFG | 32 | |
1956 | PPC | KVM_REG_PPC_ICP_STATE | 64 | |
1957 | PPC | KVM_REG_PPC_TB_OFFSET | 64 | |
1958 | PPC | KVM_REG_PPC_SPMC1 | 32 | |
1959 | PPC | KVM_REG_PPC_SPMC2 | 32 | |
1960 | PPC | KVM_REG_PPC_IAMR | 64 | |
1961 | PPC | KVM_REG_PPC_TFHAR | 64 | |
1962 | PPC | KVM_REG_PPC_TFIAR | 64 | |
1963 | PPC | KVM_REG_PPC_TEXASR | 64 | |
1964 | PPC | KVM_REG_PPC_FSCR | 64 | |
1965 | PPC | KVM_REG_PPC_PSPB | 32 | |
1966 | PPC | KVM_REG_PPC_EBBHR | 64 | |
1967 | PPC | KVM_REG_PPC_EBBRR | 64 | |
1968 | PPC | KVM_REG_PPC_BESCR | 64 | |
1969 | PPC | KVM_REG_PPC_TAR | 64 | |
1970 | PPC | KVM_REG_PPC_DPDES | 64 | |
1971 | PPC | KVM_REG_PPC_DAWR | 64 | |
1972 | PPC | KVM_REG_PPC_DAWRX | 64 | |
1973 | PPC | KVM_REG_PPC_CIABR | 64 | |
1974 | PPC | KVM_REG_PPC_IC | 64 | |
1975 | PPC | KVM_REG_PPC_VTB | 64 | |
1976 | PPC | KVM_REG_PPC_CSIGR | 64 | |
1977 | PPC | KVM_REG_PPC_TACR | 64 | |
1978 | PPC | KVM_REG_PPC_TCSCR | 64 | |
1979 | PPC | KVM_REG_PPC_PID | 64 | |
1980 | PPC | KVM_REG_PPC_ACOP | 64 | |
1981 | PPC | KVM_REG_PPC_VRSAVE | 32 | |
cc568ead PB |
1982 | PPC | KVM_REG_PPC_LPCR | 32 |
1983 | PPC | KVM_REG_PPC_LPCR_64 | 64 | |
bf5590f3 JH |
1984 | PPC | KVM_REG_PPC_PPR | 64 |
1985 | PPC | KVM_REG_PPC_ARCH_COMPAT | 32 | |
1986 | PPC | KVM_REG_PPC_DABRX | 32 | |
1987 | PPC | KVM_REG_PPC_WORT | 64 | |
bc8a4e5c BB |
1988 | PPC | KVM_REG_PPC_SPRG9 | 64 |
1989 | PPC | KVM_REG_PPC_DBSR | 32 | |
bf5590f3 | 1990 | PPC | KVM_REG_PPC_TM_GPR0 | 64 |
3b783474 | 1991 | ... |
bf5590f3 JH |
1992 | PPC | KVM_REG_PPC_TM_GPR31 | 64 |
1993 | PPC | KVM_REG_PPC_TM_VSR0 | 128 | |
3b783474 | 1994 | ... |
bf5590f3 JH |
1995 | PPC | KVM_REG_PPC_TM_VSR63 | 128 |
1996 | PPC | KVM_REG_PPC_TM_CR | 64 | |
1997 | PPC | KVM_REG_PPC_TM_LR | 64 | |
1998 | PPC | KVM_REG_PPC_TM_CTR | 64 | |
1999 | PPC | KVM_REG_PPC_TM_FPSCR | 64 | |
2000 | PPC | KVM_REG_PPC_TM_AMR | 64 | |
2001 | PPC | KVM_REG_PPC_TM_PPR | 64 | |
2002 | PPC | KVM_REG_PPC_TM_VRSAVE | 64 | |
2003 | PPC | KVM_REG_PPC_TM_VSCR | 32 | |
2004 | PPC | KVM_REG_PPC_TM_DSCR | 64 | |
2005 | PPC | KVM_REG_PPC_TM_TAR | 64 | |
c2d2c21b JH |
2006 | | | |
2007 | MIPS | KVM_REG_MIPS_R0 | 64 | |
2008 | ... | |
2009 | MIPS | KVM_REG_MIPS_R31 | 64 | |
2010 | MIPS | KVM_REG_MIPS_HI | 64 | |
2011 | MIPS | KVM_REG_MIPS_LO | 64 | |
2012 | MIPS | KVM_REG_MIPS_PC | 64 | |
2013 | MIPS | KVM_REG_MIPS_CP0_INDEX | 32 | |
2014 | MIPS | KVM_REG_MIPS_CP0_CONTEXT | 64 | |
2015 | MIPS | KVM_REG_MIPS_CP0_USERLOCAL | 64 | |
2016 | MIPS | KVM_REG_MIPS_CP0_PAGEMASK | 32 | |
2017 | MIPS | KVM_REG_MIPS_CP0_WIRED | 32 | |
2018 | MIPS | KVM_REG_MIPS_CP0_HWRENA | 32 | |
2019 | MIPS | KVM_REG_MIPS_CP0_BADVADDR | 64 | |
2020 | MIPS | KVM_REG_MIPS_CP0_COUNT | 32 | |
2021 | MIPS | KVM_REG_MIPS_CP0_ENTRYHI | 64 | |
2022 | MIPS | KVM_REG_MIPS_CP0_COMPARE | 32 | |
2023 | MIPS | KVM_REG_MIPS_CP0_STATUS | 32 | |
2024 | MIPS | KVM_REG_MIPS_CP0_CAUSE | 32 | |
2025 | MIPS | KVM_REG_MIPS_CP0_EPC | 64 | |
1068eaaf | 2026 | MIPS | KVM_REG_MIPS_CP0_PRID | 32 |
c2d2c21b JH |
2027 | MIPS | KVM_REG_MIPS_CP0_CONFIG | 32 |
2028 | MIPS | KVM_REG_MIPS_CP0_CONFIG1 | 32 | |
2029 | MIPS | KVM_REG_MIPS_CP0_CONFIG2 | 32 | |
2030 | MIPS | KVM_REG_MIPS_CP0_CONFIG3 | 32 | |
c771607a JH |
2031 | MIPS | KVM_REG_MIPS_CP0_CONFIG4 | 32 |
2032 | MIPS | KVM_REG_MIPS_CP0_CONFIG5 | 32 | |
c2d2c21b JH |
2033 | MIPS | KVM_REG_MIPS_CP0_CONFIG7 | 32 |
2034 | MIPS | KVM_REG_MIPS_CP0_ERROREPC | 64 | |
05108709 JH |
2035 | MIPS | KVM_REG_MIPS_CP0_KSCRATCH1 | 64 |
2036 | MIPS | KVM_REG_MIPS_CP0_KSCRATCH2 | 64 | |
2037 | MIPS | KVM_REG_MIPS_CP0_KSCRATCH3 | 64 | |
2038 | MIPS | KVM_REG_MIPS_CP0_KSCRATCH4 | 64 | |
2039 | MIPS | KVM_REG_MIPS_CP0_KSCRATCH5 | 64 | |
2040 | MIPS | KVM_REG_MIPS_CP0_KSCRATCH6 | 64 | |
c2d2c21b JH |
2041 | MIPS | KVM_REG_MIPS_COUNT_CTL | 64 |
2042 | MIPS | KVM_REG_MIPS_COUNT_RESUME | 64 | |
2043 | MIPS | KVM_REG_MIPS_COUNT_HZ | 64 | |
379245cd JH |
2044 | MIPS | KVM_REG_MIPS_FPR_32(0..31) | 32 |
2045 | MIPS | KVM_REG_MIPS_FPR_64(0..31) | 64 | |
ab86bd60 | 2046 | MIPS | KVM_REG_MIPS_VEC_128(0..31) | 128 |
379245cd JH |
2047 | MIPS | KVM_REG_MIPS_FCR_IR | 32 |
2048 | MIPS | KVM_REG_MIPS_FCR_CSR | 32 | |
ab86bd60 JH |
2049 | MIPS | KVM_REG_MIPS_MSA_IR | 32 |
2050 | MIPS | KVM_REG_MIPS_MSA_CSR | 32 | |
414fa985 | 2051 | |
749cf76c CD |
2052 | ARM registers are mapped using the lower 32 bits. The upper 16 of that |
2053 | is the register group type, or coprocessor number: | |
2054 | ||
2055 | ARM core registers have the following id bit patterns: | |
aa404ddf | 2056 | 0x4020 0000 0010 <index into the kvm_regs struct:16> |
749cf76c | 2057 | |
1138245c | 2058 | ARM 32-bit CP15 registers have the following id bit patterns: |
aa404ddf | 2059 | 0x4020 0000 000F <zero:1> <crn:4> <crm:4> <opc1:4> <opc2:3> |
1138245c CD |
2060 | |
2061 | ARM 64-bit CP15 registers have the following id bit patterns: | |
aa404ddf | 2062 | 0x4030 0000 000F <zero:1> <zero:4> <crm:4> <opc1:4> <zero:3> |
749cf76c | 2063 | |
c27581ed | 2064 | ARM CCSIDR registers are demultiplexed by CSSELR value: |
aa404ddf | 2065 | 0x4020 0000 0011 00 <csselr:8> |
749cf76c | 2066 | |
4fe21e4c | 2067 | ARM 32-bit VFP control registers have the following id bit patterns: |
aa404ddf | 2068 | 0x4020 0000 0012 1 <regno:12> |
4fe21e4c RR |
2069 | |
2070 | ARM 64-bit FP registers have the following id bit patterns: | |
aa404ddf | 2071 | 0x4030 0000 0012 0 <regno:12> |
4fe21e4c | 2072 | |
379e04c7 MZ |
2073 | |
2074 | arm64 registers are mapped using the lower 32 bits. The upper 16 of | |
2075 | that is the register group type, or coprocessor number: | |
2076 | ||
2077 | arm64 core/FP-SIMD registers have the following id bit patterns. Note | |
2078 | that the size of the access is variable, as the kvm_regs structure | |
2079 | contains elements ranging from 32 to 128 bits. The index is a 32bit | |
2080 | value in the kvm_regs structure seen as a 32bit array. | |
2081 | 0x60x0 0000 0010 <index into the kvm_regs struct:16> | |
2082 | ||
2083 | arm64 CCSIDR registers are demultiplexed by CSSELR value: | |
2084 | 0x6020 0000 0011 00 <csselr:8> | |
2085 | ||
2086 | arm64 system registers have the following id bit patterns: | |
2087 | 0x6030 0000 0013 <op0:2> <op1:3> <crn:4> <crm:4> <op2:3> | |
2088 | ||
c2d2c21b JH |
2089 | |
2090 | MIPS registers are mapped using the lower 32 bits. The upper 16 of that is | |
2091 | the register group type: | |
2092 | ||
2093 | MIPS core registers (see above) have the following id bit patterns: | |
2094 | 0x7030 0000 0000 <reg:16> | |
2095 | ||
2096 | MIPS CP0 registers (see KVM_REG_MIPS_CP0_* above) have the following id bit | |
2097 | patterns depending on whether they're 32-bit or 64-bit registers: | |
2098 | 0x7020 0000 0001 00 <reg:5> <sel:3> (32-bit) | |
2099 | 0x7030 0000 0001 00 <reg:5> <sel:3> (64-bit) | |
2100 | ||
2101 | MIPS KVM control registers (see above) have the following id bit patterns: | |
2102 | 0x7030 0000 0002 <reg:16> | |
2103 | ||
379245cd JH |
2104 | MIPS FPU registers (see KVM_REG_MIPS_FPR_{32,64}() above) have the following |
2105 | id bit patterns depending on the size of the register being accessed. They are | |
2106 | always accessed according to the current guest FPU mode (Status.FR and | |
2107 | Config5.FRE), i.e. as the guest would see them, and they become unpredictable | |
ab86bd60 JH |
2108 | if the guest FPU mode is changed. MIPS SIMD Architecture (MSA) vector |
2109 | registers (see KVM_REG_MIPS_VEC_128() above) have similar patterns as they | |
2110 | overlap the FPU registers: | |
379245cd JH |
2111 | 0x7020 0000 0003 00 <0:3> <reg:5> (32-bit FPU registers) |
2112 | 0x7030 0000 0003 00 <0:3> <reg:5> (64-bit FPU registers) | |
ab86bd60 | 2113 | 0x7040 0000 0003 00 <0:3> <reg:5> (128-bit MSA vector registers) |
379245cd JH |
2114 | |
2115 | MIPS FPU control registers (see KVM_REG_MIPS_FCR_{IR,CSR} above) have the | |
2116 | following id bit patterns: | |
2117 | 0x7020 0000 0003 01 <0:3> <reg:5> | |
2118 | ||
ab86bd60 JH |
2119 | MIPS MSA control registers (see KVM_REG_MIPS_MSA_{IR,CSR} above) have the |
2120 | following id bit patterns: | |
2121 | 0x7020 0000 0003 02 <0:3> <reg:5> | |
2122 | ||
c2d2c21b | 2123 | |
e24ed81f AG |
2124 | 4.69 KVM_GET_ONE_REG |
2125 | ||
2126 | Capability: KVM_CAP_ONE_REG | |
2127 | Architectures: all | |
2128 | Type: vcpu ioctl | |
2129 | Parameters: struct kvm_one_reg (in and out) | |
2130 | Returns: 0 on success, negative value on failure | |
2131 | ||
2132 | This ioctl allows to receive the value of a single register implemented | |
2133 | in a vcpu. The register to read is indicated by the "id" field of the | |
2134 | kvm_one_reg struct passed in. On success, the register value can be found | |
2135 | at the memory location pointed to by "addr". | |
2136 | ||
2137 | The list of registers accessible using this interface is identical to the | |
2e232702 | 2138 | list in 4.68. |
e24ed81f | 2139 | |
414fa985 | 2140 | |
1c0b28c2 EM |
2141 | 4.70 KVM_KVMCLOCK_CTRL |
2142 | ||
2143 | Capability: KVM_CAP_KVMCLOCK_CTRL | |
2144 | Architectures: Any that implement pvclocks (currently x86 only) | |
2145 | Type: vcpu ioctl | |
2146 | Parameters: None | |
2147 | Returns: 0 on success, -1 on error | |
2148 | ||
2149 | This signals to the host kernel that the specified guest is being paused by | |
2150 | userspace. The host will set a flag in the pvclock structure that is checked | |
2151 | from the soft lockup watchdog. The flag is part of the pvclock structure that | |
2152 | is shared between guest and host, specifically the second bit of the flags | |
2153 | field of the pvclock_vcpu_time_info structure. It will be set exclusively by | |
2154 | the host and read/cleared exclusively by the guest. The guest operation of | |
2155 | checking and clearing the flag must an atomic operation so | |
2156 | load-link/store-conditional, or equivalent must be used. There are two cases | |
2157 | where the guest will clear the flag: when the soft lockup watchdog timer resets | |
2158 | itself or when a soft lockup is detected. This ioctl can be called any time | |
2159 | after pausing the vcpu, but before it is resumed. | |
2160 | ||
414fa985 | 2161 | |
07975ad3 JK |
2162 | 4.71 KVM_SIGNAL_MSI |
2163 | ||
2164 | Capability: KVM_CAP_SIGNAL_MSI | |
0e4e82f1 | 2165 | Architectures: x86 arm64 |
07975ad3 JK |
2166 | Type: vm ioctl |
2167 | Parameters: struct kvm_msi (in) | |
2168 | Returns: >0 on delivery, 0 if guest blocked the MSI, and -1 on error | |
2169 | ||
2170 | Directly inject a MSI message. Only valid with in-kernel irqchip that handles | |
2171 | MSI messages. | |
2172 | ||
2173 | struct kvm_msi { | |
2174 | __u32 address_lo; | |
2175 | __u32 address_hi; | |
2176 | __u32 data; | |
2177 | __u32 flags; | |
2b8ddd93 AP |
2178 | __u32 devid; |
2179 | __u8 pad[12]; | |
07975ad3 JK |
2180 | }; |
2181 | ||
2b8ddd93 AP |
2182 | flags: KVM_MSI_VALID_DEVID: devid contains a valid value |
2183 | devid: If KVM_MSI_VALID_DEVID is set, contains a unique device identifier | |
2184 | for the device that wrote the MSI message. | |
2185 | For PCI, this is usually a BFD identifier in the lower 16 bits. | |
2186 | ||
2187 | The per-VM KVM_CAP_MSI_DEVID capability advertises the need to provide | |
2188 | the device ID. If this capability is not set, userland cannot rely on | |
2189 | the kernel to allow the KVM_MSI_VALID_DEVID flag being set. | |
07975ad3 | 2190 | |
414fa985 | 2191 | |
0589ff6c JK |
2192 | 4.71 KVM_CREATE_PIT2 |
2193 | ||
2194 | Capability: KVM_CAP_PIT2 | |
2195 | Architectures: x86 | |
2196 | Type: vm ioctl | |
2197 | Parameters: struct kvm_pit_config (in) | |
2198 | Returns: 0 on success, -1 on error | |
2199 | ||
2200 | Creates an in-kernel device model for the i8254 PIT. This call is only valid | |
2201 | after enabling in-kernel irqchip support via KVM_CREATE_IRQCHIP. The following | |
2202 | parameters have to be passed: | |
2203 | ||
2204 | struct kvm_pit_config { | |
2205 | __u32 flags; | |
2206 | __u32 pad[15]; | |
2207 | }; | |
2208 | ||
2209 | Valid flags are: | |
2210 | ||
2211 | #define KVM_PIT_SPEAKER_DUMMY 1 /* emulate speaker port stub */ | |
2212 | ||
b6ddf05f JK |
2213 | PIT timer interrupts may use a per-VM kernel thread for injection. If it |
2214 | exists, this thread will have a name of the following pattern: | |
2215 | ||
2216 | kvm-pit/<owner-process-pid> | |
2217 | ||
2218 | When running a guest with elevated priorities, the scheduling parameters of | |
2219 | this thread may have to be adjusted accordingly. | |
2220 | ||
0589ff6c JK |
2221 | This IOCTL replaces the obsolete KVM_CREATE_PIT. |
2222 | ||
2223 | ||
2224 | 4.72 KVM_GET_PIT2 | |
2225 | ||
2226 | Capability: KVM_CAP_PIT_STATE2 | |
2227 | Architectures: x86 | |
2228 | Type: vm ioctl | |
2229 | Parameters: struct kvm_pit_state2 (out) | |
2230 | Returns: 0 on success, -1 on error | |
2231 | ||
2232 | Retrieves the state of the in-kernel PIT model. Only valid after | |
2233 | KVM_CREATE_PIT2. The state is returned in the following structure: | |
2234 | ||
2235 | struct kvm_pit_state2 { | |
2236 | struct kvm_pit_channel_state channels[3]; | |
2237 | __u32 flags; | |
2238 | __u32 reserved[9]; | |
2239 | }; | |
2240 | ||
2241 | Valid flags are: | |
2242 | ||
2243 | /* disable PIT in HPET legacy mode */ | |
2244 | #define KVM_PIT_FLAGS_HPET_LEGACY 0x00000001 | |
2245 | ||
2246 | This IOCTL replaces the obsolete KVM_GET_PIT. | |
2247 | ||
2248 | ||
2249 | 4.73 KVM_SET_PIT2 | |
2250 | ||
2251 | Capability: KVM_CAP_PIT_STATE2 | |
2252 | Architectures: x86 | |
2253 | Type: vm ioctl | |
2254 | Parameters: struct kvm_pit_state2 (in) | |
2255 | Returns: 0 on success, -1 on error | |
2256 | ||
2257 | Sets the state of the in-kernel PIT model. Only valid after KVM_CREATE_PIT2. | |
2258 | See KVM_GET_PIT2 for details on struct kvm_pit_state2. | |
2259 | ||
2260 | This IOCTL replaces the obsolete KVM_SET_PIT. | |
2261 | ||
2262 | ||
5b74716e BH |
2263 | 4.74 KVM_PPC_GET_SMMU_INFO |
2264 | ||
2265 | Capability: KVM_CAP_PPC_GET_SMMU_INFO | |
2266 | Architectures: powerpc | |
2267 | Type: vm ioctl | |
2268 | Parameters: None | |
2269 | Returns: 0 on success, -1 on error | |
2270 | ||
2271 | This populates and returns a structure describing the features of | |
2272 | the "Server" class MMU emulation supported by KVM. | |
cc22c354 | 2273 | This can in turn be used by userspace to generate the appropriate |
5b74716e BH |
2274 | device-tree properties for the guest operating system. |
2275 | ||
c98be0c9 | 2276 | The structure contains some global information, followed by an |
5b74716e BH |
2277 | array of supported segment page sizes: |
2278 | ||
2279 | struct kvm_ppc_smmu_info { | |
2280 | __u64 flags; | |
2281 | __u32 slb_size; | |
2282 | __u32 pad; | |
2283 | struct kvm_ppc_one_seg_page_size sps[KVM_PPC_PAGE_SIZES_MAX_SZ]; | |
2284 | }; | |
2285 | ||
2286 | The supported flags are: | |
2287 | ||
2288 | - KVM_PPC_PAGE_SIZES_REAL: | |
2289 | When that flag is set, guest page sizes must "fit" the backing | |
2290 | store page sizes. When not set, any page size in the list can | |
2291 | be used regardless of how they are backed by userspace. | |
2292 | ||
2293 | - KVM_PPC_1T_SEGMENTS | |
2294 | The emulated MMU supports 1T segments in addition to the | |
2295 | standard 256M ones. | |
2296 | ||
2297 | The "slb_size" field indicates how many SLB entries are supported | |
2298 | ||
2299 | The "sps" array contains 8 entries indicating the supported base | |
2300 | page sizes for a segment in increasing order. Each entry is defined | |
2301 | as follow: | |
2302 | ||
2303 | struct kvm_ppc_one_seg_page_size { | |
2304 | __u32 page_shift; /* Base page shift of segment (or 0) */ | |
2305 | __u32 slb_enc; /* SLB encoding for BookS */ | |
2306 | struct kvm_ppc_one_page_size enc[KVM_PPC_PAGE_SIZES_MAX_SZ]; | |
2307 | }; | |
2308 | ||
2309 | An entry with a "page_shift" of 0 is unused. Because the array is | |
2310 | organized in increasing order, a lookup can stop when encoutering | |
2311 | such an entry. | |
2312 | ||
2313 | The "slb_enc" field provides the encoding to use in the SLB for the | |
2314 | page size. The bits are in positions such as the value can directly | |
2315 | be OR'ed into the "vsid" argument of the slbmte instruction. | |
2316 | ||
2317 | The "enc" array is a list which for each of those segment base page | |
2318 | size provides the list of supported actual page sizes (which can be | |
2319 | only larger or equal to the base page size), along with the | |
f884ab15 | 2320 | corresponding encoding in the hash PTE. Similarly, the array is |
5b74716e BH |
2321 | 8 entries sorted by increasing sizes and an entry with a "0" shift |
2322 | is an empty entry and a terminator: | |
2323 | ||
2324 | struct kvm_ppc_one_page_size { | |
2325 | __u32 page_shift; /* Page shift (or 0) */ | |
2326 | __u32 pte_enc; /* Encoding in the HPTE (>>12) */ | |
2327 | }; | |
2328 | ||
2329 | The "pte_enc" field provides a value that can OR'ed into the hash | |
2330 | PTE's RPN field (ie, it needs to be shifted left by 12 to OR it | |
2331 | into the hash PTE second double word). | |
2332 | ||
f36992e3 AW |
2333 | 4.75 KVM_IRQFD |
2334 | ||
2335 | Capability: KVM_CAP_IRQFD | |
174178fe | 2336 | Architectures: x86 s390 arm arm64 |
f36992e3 AW |
2337 | Type: vm ioctl |
2338 | Parameters: struct kvm_irqfd (in) | |
2339 | Returns: 0 on success, -1 on error | |
2340 | ||
2341 | Allows setting an eventfd to directly trigger a guest interrupt. | |
2342 | kvm_irqfd.fd specifies the file descriptor to use as the eventfd and | |
2343 | kvm_irqfd.gsi specifies the irqchip pin toggled by this event. When | |
17180032 | 2344 | an event is triggered on the eventfd, an interrupt is injected into |
f36992e3 AW |
2345 | the guest using the specified gsi pin. The irqfd is removed using |
2346 | the KVM_IRQFD_FLAG_DEASSIGN flag, specifying both kvm_irqfd.fd | |
2347 | and kvm_irqfd.gsi. | |
2348 | ||
7a84428a AW |
2349 | With KVM_CAP_IRQFD_RESAMPLE, KVM_IRQFD supports a de-assert and notify |
2350 | mechanism allowing emulation of level-triggered, irqfd-based | |
2351 | interrupts. When KVM_IRQFD_FLAG_RESAMPLE is set the user must pass an | |
2352 | additional eventfd in the kvm_irqfd.resamplefd field. When operating | |
2353 | in resample mode, posting of an interrupt through kvm_irq.fd asserts | |
2354 | the specified gsi in the irqchip. When the irqchip is resampled, such | |
17180032 | 2355 | as from an EOI, the gsi is de-asserted and the user is notified via |
7a84428a AW |
2356 | kvm_irqfd.resamplefd. It is the user's responsibility to re-queue |
2357 | the interrupt if the device making use of it still requires service. | |
2358 | Note that closing the resamplefd is not sufficient to disable the | |
2359 | irqfd. The KVM_IRQFD_FLAG_RESAMPLE is only necessary on assignment | |
2360 | and need not be specified with KVM_IRQFD_FLAG_DEASSIGN. | |
2361 | ||
174178fe EA |
2362 | On ARM/ARM64, the gsi field in the kvm_irqfd struct specifies the Shared |
2363 | Peripheral Interrupt (SPI) index, such that the GIC interrupt ID is | |
2364 | given by gsi + 32. | |
2365 | ||
5fecc9d8 | 2366 | 4.76 KVM_PPC_ALLOCATE_HTAB |
32fad281 PM |
2367 | |
2368 | Capability: KVM_CAP_PPC_ALLOC_HTAB | |
2369 | Architectures: powerpc | |
2370 | Type: vm ioctl | |
2371 | Parameters: Pointer to u32 containing hash table order (in/out) | |
2372 | Returns: 0 on success, -1 on error | |
2373 | ||
2374 | This requests the host kernel to allocate an MMU hash table for a | |
2375 | guest using the PAPR paravirtualization interface. This only does | |
2376 | anything if the kernel is configured to use the Book 3S HV style of | |
2377 | virtualization. Otherwise the capability doesn't exist and the ioctl | |
2378 | returns an ENOTTY error. The rest of this description assumes Book 3S | |
2379 | HV. | |
2380 | ||
2381 | There must be no vcpus running when this ioctl is called; if there | |
2382 | are, it will do nothing and return an EBUSY error. | |
2383 | ||
2384 | The parameter is a pointer to a 32-bit unsigned integer variable | |
2385 | containing the order (log base 2) of the desired size of the hash | |
2386 | table, which must be between 18 and 46. On successful return from the | |
2387 | ioctl, it will have been updated with the order of the hash table that | |
2388 | was allocated. | |
2389 | ||
2390 | If no hash table has been allocated when any vcpu is asked to run | |
2391 | (with the KVM_RUN ioctl), the host kernel will allocate a | |
2392 | default-sized hash table (16 MB). | |
2393 | ||
2394 | If this ioctl is called when a hash table has already been allocated, | |
2395 | the kernel will clear out the existing hash table (zero all HPTEs) and | |
2396 | return the hash table order in the parameter. (If the guest is using | |
2397 | the virtualized real-mode area (VRMA) facility, the kernel will | |
2398 | re-create the VMRA HPTEs on the next KVM_RUN of any vcpu.) | |
2399 | ||
416ad65f CH |
2400 | 4.77 KVM_S390_INTERRUPT |
2401 | ||
2402 | Capability: basic | |
2403 | Architectures: s390 | |
2404 | Type: vm ioctl, vcpu ioctl | |
2405 | Parameters: struct kvm_s390_interrupt (in) | |
2406 | Returns: 0 on success, -1 on error | |
2407 | ||
2408 | Allows to inject an interrupt to the guest. Interrupts can be floating | |
2409 | (vm ioctl) or per cpu (vcpu ioctl), depending on the interrupt type. | |
2410 | ||
2411 | Interrupt parameters are passed via kvm_s390_interrupt: | |
2412 | ||
2413 | struct kvm_s390_interrupt { | |
2414 | __u32 type; | |
2415 | __u32 parm; | |
2416 | __u64 parm64; | |
2417 | }; | |
2418 | ||
2419 | type can be one of the following: | |
2420 | ||
2822545f | 2421 | KVM_S390_SIGP_STOP (vcpu) - sigp stop; optional flags in parm |
416ad65f CH |
2422 | KVM_S390_PROGRAM_INT (vcpu) - program check; code in parm |
2423 | KVM_S390_SIGP_SET_PREFIX (vcpu) - sigp set prefix; prefix address in parm | |
2424 | KVM_S390_RESTART (vcpu) - restart | |
e029ae5b TH |
2425 | KVM_S390_INT_CLOCK_COMP (vcpu) - clock comparator interrupt |
2426 | KVM_S390_INT_CPU_TIMER (vcpu) - CPU timer interrupt | |
416ad65f CH |
2427 | KVM_S390_INT_VIRTIO (vm) - virtio external interrupt; external interrupt |
2428 | parameters in parm and parm64 | |
2429 | KVM_S390_INT_SERVICE (vm) - sclp external interrupt; sclp parameter in parm | |
2430 | KVM_S390_INT_EMERGENCY (vcpu) - sigp emergency; source cpu in parm | |
2431 | KVM_S390_INT_EXTERNAL_CALL (vcpu) - sigp external call; source cpu in parm | |
d8346b7d CH |
2432 | KVM_S390_INT_IO(ai,cssid,ssid,schid) (vm) - compound value to indicate an |
2433 | I/O interrupt (ai - adapter interrupt; cssid,ssid,schid - subchannel); | |
2434 | I/O interruption parameters in parm (subchannel) and parm64 (intparm, | |
2435 | interruption subclass) | |
48a3e950 CH |
2436 | KVM_S390_MCHK (vm, vcpu) - machine check interrupt; cr 14 bits in parm, |
2437 | machine check interrupt code in parm64 (note that | |
2438 | machine checks needing further payload are not | |
2439 | supported by this ioctl) | |
416ad65f CH |
2440 | |
2441 | Note that the vcpu ioctl is asynchronous to vcpu execution. | |
2442 | ||
a2932923 PM |
2443 | 4.78 KVM_PPC_GET_HTAB_FD |
2444 | ||
2445 | Capability: KVM_CAP_PPC_HTAB_FD | |
2446 | Architectures: powerpc | |
2447 | Type: vm ioctl | |
2448 | Parameters: Pointer to struct kvm_get_htab_fd (in) | |
2449 | Returns: file descriptor number (>= 0) on success, -1 on error | |
2450 | ||
2451 | This returns a file descriptor that can be used either to read out the | |
2452 | entries in the guest's hashed page table (HPT), or to write entries to | |
2453 | initialize the HPT. The returned fd can only be written to if the | |
2454 | KVM_GET_HTAB_WRITE bit is set in the flags field of the argument, and | |
2455 | can only be read if that bit is clear. The argument struct looks like | |
2456 | this: | |
2457 | ||
2458 | /* For KVM_PPC_GET_HTAB_FD */ | |
2459 | struct kvm_get_htab_fd { | |
2460 | __u64 flags; | |
2461 | __u64 start_index; | |
2462 | __u64 reserved[2]; | |
2463 | }; | |
2464 | ||
2465 | /* Values for kvm_get_htab_fd.flags */ | |
2466 | #define KVM_GET_HTAB_BOLTED_ONLY ((__u64)0x1) | |
2467 | #define KVM_GET_HTAB_WRITE ((__u64)0x2) | |
2468 | ||
2469 | The `start_index' field gives the index in the HPT of the entry at | |
2470 | which to start reading. It is ignored when writing. | |
2471 | ||
2472 | Reads on the fd will initially supply information about all | |
2473 | "interesting" HPT entries. Interesting entries are those with the | |
2474 | bolted bit set, if the KVM_GET_HTAB_BOLTED_ONLY bit is set, otherwise | |
2475 | all entries. When the end of the HPT is reached, the read() will | |
2476 | return. If read() is called again on the fd, it will start again from | |
2477 | the beginning of the HPT, but will only return HPT entries that have | |
2478 | changed since they were last read. | |
2479 | ||
2480 | Data read or written is structured as a header (8 bytes) followed by a | |
2481 | series of valid HPT entries (16 bytes) each. The header indicates how | |
2482 | many valid HPT entries there are and how many invalid entries follow | |
2483 | the valid entries. The invalid entries are not represented explicitly | |
2484 | in the stream. The header format is: | |
2485 | ||
2486 | struct kvm_get_htab_header { | |
2487 | __u32 index; | |
2488 | __u16 n_valid; | |
2489 | __u16 n_invalid; | |
2490 | }; | |
2491 | ||
2492 | Writes to the fd create HPT entries starting at the index given in the | |
2493 | header; first `n_valid' valid entries with contents from the data | |
2494 | written, then `n_invalid' invalid entries, invalidating any previously | |
2495 | valid entries found. | |
2496 | ||
852b6d57 SW |
2497 | 4.79 KVM_CREATE_DEVICE |
2498 | ||
2499 | Capability: KVM_CAP_DEVICE_CTRL | |
2500 | Type: vm ioctl | |
2501 | Parameters: struct kvm_create_device (in/out) | |
2502 | Returns: 0 on success, -1 on error | |
2503 | Errors: | |
2504 | ENODEV: The device type is unknown or unsupported | |
2505 | EEXIST: Device already created, and this type of device may not | |
2506 | be instantiated multiple times | |
2507 | ||
2508 | Other error conditions may be defined by individual device types or | |
2509 | have their standard meanings. | |
2510 | ||
2511 | Creates an emulated device in the kernel. The file descriptor returned | |
2512 | in fd can be used with KVM_SET/GET/HAS_DEVICE_ATTR. | |
2513 | ||
2514 | If the KVM_CREATE_DEVICE_TEST flag is set, only test whether the | |
2515 | device type is supported (not necessarily whether it can be created | |
2516 | in the current vm). | |
2517 | ||
2518 | Individual devices should not define flags. Attributes should be used | |
2519 | for specifying any behavior that is not implied by the device type | |
2520 | number. | |
2521 | ||
2522 | struct kvm_create_device { | |
2523 | __u32 type; /* in: KVM_DEV_TYPE_xxx */ | |
2524 | __u32 fd; /* out: device handle */ | |
2525 | __u32 flags; /* in: KVM_CREATE_DEVICE_xxx */ | |
2526 | }; | |
2527 | ||
2528 | 4.80 KVM_SET_DEVICE_ATTR/KVM_GET_DEVICE_ATTR | |
2529 | ||
f577f6c2 SZ |
2530 | Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device, |
2531 | KVM_CAP_VCPU_ATTRIBUTES for vcpu device | |
2532 | Type: device ioctl, vm ioctl, vcpu ioctl | |
852b6d57 SW |
2533 | Parameters: struct kvm_device_attr |
2534 | Returns: 0 on success, -1 on error | |
2535 | Errors: | |
2536 | ENXIO: The group or attribute is unknown/unsupported for this device | |
f9cbd9b0 | 2537 | or hardware support is missing. |
852b6d57 SW |
2538 | EPERM: The attribute cannot (currently) be accessed this way |
2539 | (e.g. read-only attribute, or attribute that only makes | |
2540 | sense when the device is in a different state) | |
2541 | ||
2542 | Other error conditions may be defined by individual device types. | |
2543 | ||
2544 | Gets/sets a specified piece of device configuration and/or state. The | |
2545 | semantics are device-specific. See individual device documentation in | |
2546 | the "devices" directory. As with ONE_REG, the size of the data | |
2547 | transferred is defined by the particular attribute. | |
2548 | ||
2549 | struct kvm_device_attr { | |
2550 | __u32 flags; /* no flags currently defined */ | |
2551 | __u32 group; /* device-defined */ | |
2552 | __u64 attr; /* group-defined */ | |
2553 | __u64 addr; /* userspace address of attr data */ | |
2554 | }; | |
2555 | ||
2556 | 4.81 KVM_HAS_DEVICE_ATTR | |
2557 | ||
f577f6c2 SZ |
2558 | Capability: KVM_CAP_DEVICE_CTRL, KVM_CAP_VM_ATTRIBUTES for vm device, |
2559 | KVM_CAP_VCPU_ATTRIBUTES for vcpu device | |
2560 | Type: device ioctl, vm ioctl, vcpu ioctl | |
852b6d57 SW |
2561 | Parameters: struct kvm_device_attr |
2562 | Returns: 0 on success, -1 on error | |
2563 | Errors: | |
2564 | ENXIO: The group or attribute is unknown/unsupported for this device | |
f9cbd9b0 | 2565 | or hardware support is missing. |
852b6d57 SW |
2566 | |
2567 | Tests whether a device supports a particular attribute. A successful | |
2568 | return indicates the attribute is implemented. It does not necessarily | |
2569 | indicate that the attribute can be read or written in the device's | |
2570 | current state. "addr" is ignored. | |
f36992e3 | 2571 | |
d8968f1f | 2572 | 4.82 KVM_ARM_VCPU_INIT |
749cf76c CD |
2573 | |
2574 | Capability: basic | |
379e04c7 | 2575 | Architectures: arm, arm64 |
749cf76c | 2576 | Type: vcpu ioctl |
beb11fc7 | 2577 | Parameters: struct kvm_vcpu_init (in) |
749cf76c CD |
2578 | Returns: 0 on success; -1 on error |
2579 | Errors: | |
2580 | EINVAL: the target is unknown, or the combination of features is invalid. | |
2581 | ENOENT: a features bit specified is unknown. | |
2582 | ||
2583 | This tells KVM what type of CPU to present to the guest, and what | |
2584 | optional features it should have. This will cause a reset of the cpu | |
2585 | registers to their initial values. If this is not called, KVM_RUN will | |
2586 | return ENOEXEC for that vcpu. | |
2587 | ||
2588 | Note that because some registers reflect machine topology, all vcpus | |
2589 | should be created before this ioctl is invoked. | |
2590 | ||
f7fa034d CD |
2591 | Userspace can call this function multiple times for a given vcpu, including |
2592 | after the vcpu has been run. This will reset the vcpu to its initial | |
2593 | state. All calls to this function after the initial call must use the same | |
2594 | target and same set of feature flags, otherwise EINVAL will be returned. | |
2595 | ||
aa024c2f MZ |
2596 | Possible features: |
2597 | - KVM_ARM_VCPU_POWER_OFF: Starts the CPU in a power-off state. | |
3ad8b3de CD |
2598 | Depends on KVM_CAP_ARM_PSCI. If not set, the CPU will be powered on |
2599 | and execute guest code when KVM_RUN is called. | |
379e04c7 MZ |
2600 | - KVM_ARM_VCPU_EL1_32BIT: Starts the CPU in a 32bit mode. |
2601 | Depends on KVM_CAP_ARM_EL1_32BIT (arm64 only). | |
50bb0c94 AP |
2602 | - KVM_ARM_VCPU_PSCI_0_2: Emulate PSCI v0.2 for the CPU. |
2603 | Depends on KVM_CAP_ARM_PSCI_0_2. | |
808e7381 SZ |
2604 | - KVM_ARM_VCPU_PMU_V3: Emulate PMUv3 for the CPU. |
2605 | Depends on KVM_CAP_ARM_PMU_V3. | |
aa024c2f | 2606 | |
749cf76c | 2607 | |
740edfc0 AP |
2608 | 4.83 KVM_ARM_PREFERRED_TARGET |
2609 | ||
2610 | Capability: basic | |
2611 | Architectures: arm, arm64 | |
2612 | Type: vm ioctl | |
2613 | Parameters: struct struct kvm_vcpu_init (out) | |
2614 | Returns: 0 on success; -1 on error | |
2615 | Errors: | |
a7265fb1 | 2616 | ENODEV: no preferred target available for the host |
740edfc0 AP |
2617 | |
2618 | This queries KVM for preferred CPU target type which can be emulated | |
2619 | by KVM on underlying host. | |
2620 | ||
2621 | The ioctl returns struct kvm_vcpu_init instance containing information | |
2622 | about preferred CPU target type and recommended features for it. The | |
2623 | kvm_vcpu_init->features bitmap returned will have feature bits set if | |
2624 | the preferred target recommends setting these features, but this is | |
2625 | not mandatory. | |
2626 | ||
2627 | The information returned by this ioctl can be used to prepare an instance | |
2628 | of struct kvm_vcpu_init for KVM_ARM_VCPU_INIT ioctl which will result in | |
2629 | in VCPU matching underlying host. | |
2630 | ||
2631 | ||
2632 | 4.84 KVM_GET_REG_LIST | |
749cf76c CD |
2633 | |
2634 | Capability: basic | |
c2d2c21b | 2635 | Architectures: arm, arm64, mips |
749cf76c CD |
2636 | Type: vcpu ioctl |
2637 | Parameters: struct kvm_reg_list (in/out) | |
2638 | Returns: 0 on success; -1 on error | |
2639 | Errors: | |
2640 | E2BIG: the reg index list is too big to fit in the array specified by | |
2641 | the user (the number required will be written into n). | |
2642 | ||
2643 | struct kvm_reg_list { | |
2644 | __u64 n; /* number of registers in reg[] */ | |
2645 | __u64 reg[0]; | |
2646 | }; | |
2647 | ||
2648 | This ioctl returns the guest registers that are supported for the | |
2649 | KVM_GET_ONE_REG/KVM_SET_ONE_REG calls. | |
2650 | ||
ce01e4e8 CD |
2651 | |
2652 | 4.85 KVM_ARM_SET_DEVICE_ADDR (deprecated) | |
3401d546 CD |
2653 | |
2654 | Capability: KVM_CAP_ARM_SET_DEVICE_ADDR | |
379e04c7 | 2655 | Architectures: arm, arm64 |
3401d546 CD |
2656 | Type: vm ioctl |
2657 | Parameters: struct kvm_arm_device_address (in) | |
2658 | Returns: 0 on success, -1 on error | |
2659 | Errors: | |
2660 | ENODEV: The device id is unknown | |
2661 | ENXIO: Device not supported on current system | |
2662 | EEXIST: Address already set | |
2663 | E2BIG: Address outside guest physical address space | |
330690cd | 2664 | EBUSY: Address overlaps with other device range |
3401d546 CD |
2665 | |
2666 | struct kvm_arm_device_addr { | |
2667 | __u64 id; | |
2668 | __u64 addr; | |
2669 | }; | |
2670 | ||
2671 | Specify a device address in the guest's physical address space where guests | |
2672 | can access emulated or directly exposed devices, which the host kernel needs | |
2673 | to know about. The id field is an architecture specific identifier for a | |
2674 | specific device. | |
2675 | ||
379e04c7 MZ |
2676 | ARM/arm64 divides the id field into two parts, a device id and an |
2677 | address type id specific to the individual device. | |
3401d546 CD |
2678 | |
2679 | bits: | 63 ... 32 | 31 ... 16 | 15 ... 0 | | |
2680 | field: | 0x00000000 | device id | addr type id | | |
2681 | ||
379e04c7 MZ |
2682 | ARM/arm64 currently only require this when using the in-kernel GIC |
2683 | support for the hardware VGIC features, using KVM_ARM_DEVICE_VGIC_V2 | |
2684 | as the device id. When setting the base address for the guest's | |
2685 | mapping of the VGIC virtual CPU and distributor interface, the ioctl | |
2686 | must be called after calling KVM_CREATE_IRQCHIP, but before calling | |
2687 | KVM_RUN on any of the VCPUs. Calling this ioctl twice for any of the | |
2688 | base addresses will return -EEXIST. | |
3401d546 | 2689 | |
ce01e4e8 CD |
2690 | Note, this IOCTL is deprecated and the more flexible SET/GET_DEVICE_ATTR API |
2691 | should be used instead. | |
2692 | ||
2693 | ||
740edfc0 | 2694 | 4.86 KVM_PPC_RTAS_DEFINE_TOKEN |
8e591cb7 ME |
2695 | |
2696 | Capability: KVM_CAP_PPC_RTAS | |
2697 | Architectures: ppc | |
2698 | Type: vm ioctl | |
2699 | Parameters: struct kvm_rtas_token_args | |
2700 | Returns: 0 on success, -1 on error | |
2701 | ||
2702 | Defines a token value for a RTAS (Run Time Abstraction Services) | |
2703 | service in order to allow it to be handled in the kernel. The | |
2704 | argument struct gives the name of the service, which must be the name | |
2705 | of a service that has a kernel-side implementation. If the token | |
2706 | value is non-zero, it will be associated with that service, and | |
2707 | subsequent RTAS calls by the guest specifying that token will be | |
2708 | handled by the kernel. If the token value is 0, then any token | |
2709 | associated with the service will be forgotten, and subsequent RTAS | |
2710 | calls by the guest for that service will be passed to userspace to be | |
2711 | handled. | |
2712 | ||
4bd9d344 AB |
2713 | 4.87 KVM_SET_GUEST_DEBUG |
2714 | ||
2715 | Capability: KVM_CAP_SET_GUEST_DEBUG | |
0e6f07f2 | 2716 | Architectures: x86, s390, ppc, arm64 |
4bd9d344 AB |
2717 | Type: vcpu ioctl |
2718 | Parameters: struct kvm_guest_debug (in) | |
2719 | Returns: 0 on success; -1 on error | |
2720 | ||
2721 | struct kvm_guest_debug { | |
2722 | __u32 control; | |
2723 | __u32 pad; | |
2724 | struct kvm_guest_debug_arch arch; | |
2725 | }; | |
2726 | ||
2727 | Set up the processor specific debug registers and configure vcpu for | |
2728 | handling guest debug events. There are two parts to the structure, the | |
2729 | first a control bitfield indicates the type of debug events to handle | |
2730 | when running. Common control bits are: | |
2731 | ||
2732 | - KVM_GUESTDBG_ENABLE: guest debugging is enabled | |
2733 | - KVM_GUESTDBG_SINGLESTEP: the next run should single-step | |
2734 | ||
2735 | The top 16 bits of the control field are architecture specific control | |
2736 | flags which can include the following: | |
2737 | ||
4bd611ca | 2738 | - KVM_GUESTDBG_USE_SW_BP: using software breakpoints [x86, arm64] |
834bf887 | 2739 | - KVM_GUESTDBG_USE_HW_BP: using hardware breakpoints [x86, s390, arm64] |
4bd9d344 AB |
2740 | - KVM_GUESTDBG_INJECT_DB: inject DB type exception [x86] |
2741 | - KVM_GUESTDBG_INJECT_BP: inject BP type exception [x86] | |
2742 | - KVM_GUESTDBG_EXIT_PENDING: trigger an immediate guest exit [s390] | |
2743 | ||
2744 | For example KVM_GUESTDBG_USE_SW_BP indicates that software breakpoints | |
2745 | are enabled in memory so we need to ensure breakpoint exceptions are | |
2746 | correctly trapped and the KVM run loop exits at the breakpoint and not | |
2747 | running off into the normal guest vector. For KVM_GUESTDBG_USE_HW_BP | |
2748 | we need to ensure the guest vCPUs architecture specific registers are | |
2749 | updated to the correct (supplied) values. | |
2750 | ||
2751 | The second part of the structure is architecture specific and | |
2752 | typically contains a set of debug registers. | |
2753 | ||
834bf887 AB |
2754 | For arm64 the number of debug registers is implementation defined and |
2755 | can be determined by querying the KVM_CAP_GUEST_DEBUG_HW_BPS and | |
2756 | KVM_CAP_GUEST_DEBUG_HW_WPS capabilities which return a positive number | |
2757 | indicating the number of supported registers. | |
2758 | ||
4bd9d344 AB |
2759 | When debug events exit the main run loop with the reason |
2760 | KVM_EXIT_DEBUG with the kvm_debug_exit_arch part of the kvm_run | |
2761 | structure containing architecture specific debug information. | |
3401d546 | 2762 | |
209cf19f AB |
2763 | 4.88 KVM_GET_EMULATED_CPUID |
2764 | ||
2765 | Capability: KVM_CAP_EXT_EMUL_CPUID | |
2766 | Architectures: x86 | |
2767 | Type: system ioctl | |
2768 | Parameters: struct kvm_cpuid2 (in/out) | |
2769 | Returns: 0 on success, -1 on error | |
2770 | ||
2771 | struct kvm_cpuid2 { | |
2772 | __u32 nent; | |
2773 | __u32 flags; | |
2774 | struct kvm_cpuid_entry2 entries[0]; | |
2775 | }; | |
2776 | ||
2777 | The member 'flags' is used for passing flags from userspace. | |
2778 | ||
2779 | #define KVM_CPUID_FLAG_SIGNIFCANT_INDEX BIT(0) | |
2780 | #define KVM_CPUID_FLAG_STATEFUL_FUNC BIT(1) | |
2781 | #define KVM_CPUID_FLAG_STATE_READ_NEXT BIT(2) | |
2782 | ||
2783 | struct kvm_cpuid_entry2 { | |
2784 | __u32 function; | |
2785 | __u32 index; | |
2786 | __u32 flags; | |
2787 | __u32 eax; | |
2788 | __u32 ebx; | |
2789 | __u32 ecx; | |
2790 | __u32 edx; | |
2791 | __u32 padding[3]; | |
2792 | }; | |
2793 | ||
2794 | This ioctl returns x86 cpuid features which are emulated by | |
2795 | kvm.Userspace can use the information returned by this ioctl to query | |
2796 | which features are emulated by kvm instead of being present natively. | |
2797 | ||
2798 | Userspace invokes KVM_GET_EMULATED_CPUID by passing a kvm_cpuid2 | |
2799 | structure with the 'nent' field indicating the number of entries in | |
2800 | the variable-size array 'entries'. If the number of entries is too low | |
2801 | to describe the cpu capabilities, an error (E2BIG) is returned. If the | |
2802 | number is too high, the 'nent' field is adjusted and an error (ENOMEM) | |
2803 | is returned. If the number is just right, the 'nent' field is adjusted | |
2804 | to the number of valid entries in the 'entries' array, which is then | |
2805 | filled. | |
2806 | ||
2807 | The entries returned are the set CPUID bits of the respective features | |
2808 | which kvm emulates, as returned by the CPUID instruction, with unknown | |
2809 | or unsupported feature bits cleared. | |
2810 | ||
2811 | Features like x2apic, for example, may not be present in the host cpu | |
2812 | but are exposed by kvm in KVM_GET_SUPPORTED_CPUID because they can be | |
2813 | emulated efficiently and thus not included here. | |
2814 | ||
2815 | The fields in each entry are defined as follows: | |
2816 | ||
2817 | function: the eax value used to obtain the entry | |
2818 | index: the ecx value used to obtain the entry (for entries that are | |
2819 | affected by ecx) | |
2820 | flags: an OR of zero or more of the following: | |
2821 | KVM_CPUID_FLAG_SIGNIFCANT_INDEX: | |
2822 | if the index field is valid | |
2823 | KVM_CPUID_FLAG_STATEFUL_FUNC: | |
2824 | if cpuid for this function returns different values for successive | |
2825 | invocations; there will be several entries with the same function, | |
2826 | all with this flag set | |
2827 | KVM_CPUID_FLAG_STATE_READ_NEXT: | |
2828 | for KVM_CPUID_FLAG_STATEFUL_FUNC entries, set if this entry is | |
2829 | the first entry to be read by a cpu | |
2830 | eax, ebx, ecx, edx: the values returned by the cpuid instruction for | |
2831 | this function/index combination | |
2832 | ||
41408c28 TH |
2833 | 4.89 KVM_S390_MEM_OP |
2834 | ||
2835 | Capability: KVM_CAP_S390_MEM_OP | |
2836 | Architectures: s390 | |
2837 | Type: vcpu ioctl | |
2838 | Parameters: struct kvm_s390_mem_op (in) | |
2839 | Returns: = 0 on success, | |
2840 | < 0 on generic error (e.g. -EFAULT or -ENOMEM), | |
2841 | > 0 if an exception occurred while walking the page tables | |
2842 | ||
5d4f6f3d | 2843 | Read or write data from/to the logical (virtual) memory of a VCPU. |
41408c28 TH |
2844 | |
2845 | Parameters are specified via the following structure: | |
2846 | ||
2847 | struct kvm_s390_mem_op { | |
2848 | __u64 gaddr; /* the guest address */ | |
2849 | __u64 flags; /* flags */ | |
2850 | __u32 size; /* amount of bytes */ | |
2851 | __u32 op; /* type of operation */ | |
2852 | __u64 buf; /* buffer in userspace */ | |
2853 | __u8 ar; /* the access register number */ | |
2854 | __u8 reserved[31]; /* should be set to 0 */ | |
2855 | }; | |
2856 | ||
2857 | The type of operation is specified in the "op" field. It is either | |
2858 | KVM_S390_MEMOP_LOGICAL_READ for reading from logical memory space or | |
2859 | KVM_S390_MEMOP_LOGICAL_WRITE for writing to logical memory space. The | |
2860 | KVM_S390_MEMOP_F_CHECK_ONLY flag can be set in the "flags" field to check | |
2861 | whether the corresponding memory access would create an access exception | |
2862 | (without touching the data in the memory at the destination). In case an | |
2863 | access exception occurred while walking the MMU tables of the guest, the | |
2864 | ioctl returns a positive error number to indicate the type of exception. | |
2865 | This exception is also raised directly at the corresponding VCPU if the | |
2866 | flag KVM_S390_MEMOP_F_INJECT_EXCEPTION is set in the "flags" field. | |
2867 | ||
2868 | The start address of the memory region has to be specified in the "gaddr" | |
2869 | field, and the length of the region in the "size" field. "buf" is the buffer | |
2870 | supplied by the userspace application where the read data should be written | |
2871 | to for KVM_S390_MEMOP_LOGICAL_READ, or where the data that should be written | |
2872 | is stored for a KVM_S390_MEMOP_LOGICAL_WRITE. "buf" is unused and can be NULL | |
2873 | when KVM_S390_MEMOP_F_CHECK_ONLY is specified. "ar" designates the access | |
2874 | register number to be used. | |
2875 | ||
2876 | The "reserved" field is meant for future extensions. It is not used by | |
2877 | KVM with the currently defined set of flags. | |
2878 | ||
30ee2a98 JH |
2879 | 4.90 KVM_S390_GET_SKEYS |
2880 | ||
2881 | Capability: KVM_CAP_S390_SKEYS | |
2882 | Architectures: s390 | |
2883 | Type: vm ioctl | |
2884 | Parameters: struct kvm_s390_skeys | |
2885 | Returns: 0 on success, KVM_S390_GET_KEYS_NONE if guest is not using storage | |
2886 | keys, negative value on error | |
2887 | ||
2888 | This ioctl is used to get guest storage key values on the s390 | |
2889 | architecture. The ioctl takes parameters via the kvm_s390_skeys struct. | |
2890 | ||
2891 | struct kvm_s390_skeys { | |
2892 | __u64 start_gfn; | |
2893 | __u64 count; | |
2894 | __u64 skeydata_addr; | |
2895 | __u32 flags; | |
2896 | __u32 reserved[9]; | |
2897 | }; | |
2898 | ||
2899 | The start_gfn field is the number of the first guest frame whose storage keys | |
2900 | you want to get. | |
2901 | ||
2902 | The count field is the number of consecutive frames (starting from start_gfn) | |
2903 | whose storage keys to get. The count field must be at least 1 and the maximum | |
2904 | allowed value is defined as KVM_S390_SKEYS_ALLOC_MAX. Values outside this range | |
2905 | will cause the ioctl to return -EINVAL. | |
2906 | ||
2907 | The skeydata_addr field is the address to a buffer large enough to hold count | |
2908 | bytes. This buffer will be filled with storage key data by the ioctl. | |
2909 | ||
2910 | 4.91 KVM_S390_SET_SKEYS | |
2911 | ||
2912 | Capability: KVM_CAP_S390_SKEYS | |
2913 | Architectures: s390 | |
2914 | Type: vm ioctl | |
2915 | Parameters: struct kvm_s390_skeys | |
2916 | Returns: 0 on success, negative value on error | |
2917 | ||
2918 | This ioctl is used to set guest storage key values on the s390 | |
2919 | architecture. The ioctl takes parameters via the kvm_s390_skeys struct. | |
2920 | See section on KVM_S390_GET_SKEYS for struct definition. | |
2921 | ||
2922 | The start_gfn field is the number of the first guest frame whose storage keys | |
2923 | you want to set. | |
2924 | ||
2925 | The count field is the number of consecutive frames (starting from start_gfn) | |
2926 | whose storage keys to get. The count field must be at least 1 and the maximum | |
2927 | allowed value is defined as KVM_S390_SKEYS_ALLOC_MAX. Values outside this range | |
2928 | will cause the ioctl to return -EINVAL. | |
2929 | ||
2930 | The skeydata_addr field is the address to a buffer containing count bytes of | |
2931 | storage keys. Each byte in the buffer will be set as the storage key for a | |
2932 | single frame starting at start_gfn for count frames. | |
2933 | ||
2934 | Note: If any architecturally invalid key value is found in the given data then | |
2935 | the ioctl will return -EINVAL. | |
2936 | ||
47b43c52 JF |
2937 | 4.92 KVM_S390_IRQ |
2938 | ||
2939 | Capability: KVM_CAP_S390_INJECT_IRQ | |
2940 | Architectures: s390 | |
2941 | Type: vcpu ioctl | |
2942 | Parameters: struct kvm_s390_irq (in) | |
2943 | Returns: 0 on success, -1 on error | |
2944 | Errors: | |
2945 | EINVAL: interrupt type is invalid | |
2946 | type is KVM_S390_SIGP_STOP and flag parameter is invalid value | |
2947 | type is KVM_S390_INT_EXTERNAL_CALL and code is bigger | |
2948 | than the maximum of VCPUs | |
2949 | EBUSY: type is KVM_S390_SIGP_SET_PREFIX and vcpu is not stopped | |
2950 | type is KVM_S390_SIGP_STOP and a stop irq is already pending | |
2951 | type is KVM_S390_INT_EXTERNAL_CALL and an external call interrupt | |
2952 | is already pending | |
2953 | ||
2954 | Allows to inject an interrupt to the guest. | |
2955 | ||
2956 | Using struct kvm_s390_irq as a parameter allows | |
2957 | to inject additional payload which is not | |
2958 | possible via KVM_S390_INTERRUPT. | |
2959 | ||
2960 | Interrupt parameters are passed via kvm_s390_irq: | |
2961 | ||
2962 | struct kvm_s390_irq { | |
2963 | __u64 type; | |
2964 | union { | |
2965 | struct kvm_s390_io_info io; | |
2966 | struct kvm_s390_ext_info ext; | |
2967 | struct kvm_s390_pgm_info pgm; | |
2968 | struct kvm_s390_emerg_info emerg; | |
2969 | struct kvm_s390_extcall_info extcall; | |
2970 | struct kvm_s390_prefix_info prefix; | |
2971 | struct kvm_s390_stop_info stop; | |
2972 | struct kvm_s390_mchk_info mchk; | |
2973 | char reserved[64]; | |
2974 | } u; | |
2975 | }; | |
2976 | ||
2977 | type can be one of the following: | |
2978 | ||
2979 | KVM_S390_SIGP_STOP - sigp stop; parameter in .stop | |
2980 | KVM_S390_PROGRAM_INT - program check; parameters in .pgm | |
2981 | KVM_S390_SIGP_SET_PREFIX - sigp set prefix; parameters in .prefix | |
2982 | KVM_S390_RESTART - restart; no parameters | |
2983 | KVM_S390_INT_CLOCK_COMP - clock comparator interrupt; no parameters | |
2984 | KVM_S390_INT_CPU_TIMER - CPU timer interrupt; no parameters | |
2985 | KVM_S390_INT_EMERGENCY - sigp emergency; parameters in .emerg | |
2986 | KVM_S390_INT_EXTERNAL_CALL - sigp external call; parameters in .extcall | |
2987 | KVM_S390_MCHK - machine check interrupt; parameters in .mchk | |
2988 | ||
2989 | ||
2990 | Note that the vcpu ioctl is asynchronous to vcpu execution. | |
2991 | ||
816c7667 JF |
2992 | 4.94 KVM_S390_GET_IRQ_STATE |
2993 | ||
2994 | Capability: KVM_CAP_S390_IRQ_STATE | |
2995 | Architectures: s390 | |
2996 | Type: vcpu ioctl | |
2997 | Parameters: struct kvm_s390_irq_state (out) | |
2998 | Returns: >= number of bytes copied into buffer, | |
2999 | -EINVAL if buffer size is 0, | |
3000 | -ENOBUFS if buffer size is too small to fit all pending interrupts, | |
3001 | -EFAULT if the buffer address was invalid | |
3002 | ||
3003 | This ioctl allows userspace to retrieve the complete state of all currently | |
3004 | pending interrupts in a single buffer. Use cases include migration | |
3005 | and introspection. The parameter structure contains the address of a | |
3006 | userspace buffer and its length: | |
3007 | ||
3008 | struct kvm_s390_irq_state { | |
3009 | __u64 buf; | |
3010 | __u32 flags; | |
3011 | __u32 len; | |
3012 | __u32 reserved[4]; | |
3013 | }; | |
3014 | ||
3015 | Userspace passes in the above struct and for each pending interrupt a | |
3016 | struct kvm_s390_irq is copied to the provided buffer. | |
3017 | ||
3018 | If -ENOBUFS is returned the buffer provided was too small and userspace | |
3019 | may retry with a bigger buffer. | |
3020 | ||
3021 | 4.95 KVM_S390_SET_IRQ_STATE | |
3022 | ||
3023 | Capability: KVM_CAP_S390_IRQ_STATE | |
3024 | Architectures: s390 | |
3025 | Type: vcpu ioctl | |
3026 | Parameters: struct kvm_s390_irq_state (in) | |
3027 | Returns: 0 on success, | |
3028 | -EFAULT if the buffer address was invalid, | |
3029 | -EINVAL for an invalid buffer length (see below), | |
3030 | -EBUSY if there were already interrupts pending, | |
3031 | errors occurring when actually injecting the | |
3032 | interrupt. See KVM_S390_IRQ. | |
3033 | ||
3034 | This ioctl allows userspace to set the complete state of all cpu-local | |
3035 | interrupts currently pending for the vcpu. It is intended for restoring | |
3036 | interrupt state after a migration. The input parameter is a userspace buffer | |
3037 | containing a struct kvm_s390_irq_state: | |
3038 | ||
3039 | struct kvm_s390_irq_state { | |
3040 | __u64 buf; | |
3041 | __u32 len; | |
3042 | __u32 pad; | |
3043 | }; | |
3044 | ||
3045 | The userspace memory referenced by buf contains a struct kvm_s390_irq | |
3046 | for each interrupt to be injected into the guest. | |
3047 | If one of the interrupts could not be injected for some reason the | |
3048 | ioctl aborts. | |
3049 | ||
3050 | len must be a multiple of sizeof(struct kvm_s390_irq). It must be > 0 | |
3051 | and it must not exceed (max_vcpus + 32) * sizeof(struct kvm_s390_irq), | |
3052 | which is the maximum number of possibly pending cpu-local interrupts. | |
47b43c52 | 3053 | |
ed8e5a24 | 3054 | 4.96 KVM_SMI |
f077825a PB |
3055 | |
3056 | Capability: KVM_CAP_X86_SMM | |
3057 | Architectures: x86 | |
3058 | Type: vcpu ioctl | |
3059 | Parameters: none | |
3060 | Returns: 0 on success, -1 on error | |
3061 | ||
3062 | Queues an SMI on the thread's vcpu. | |
3063 | ||
d3695aa4 AK |
3064 | 4.97 KVM_CAP_PPC_MULTITCE |
3065 | ||
3066 | Capability: KVM_CAP_PPC_MULTITCE | |
3067 | Architectures: ppc | |
3068 | Type: vm | |
3069 | ||
3070 | This capability means the kernel is capable of handling hypercalls | |
3071 | H_PUT_TCE_INDIRECT and H_STUFF_TCE without passing those into the user | |
3072 | space. This significantly accelerates DMA operations for PPC KVM guests. | |
3073 | User space should expect that its handlers for these hypercalls | |
3074 | are not going to be called if user space previously registered LIOBN | |
3075 | in KVM (via KVM_CREATE_SPAPR_TCE or similar calls). | |
3076 | ||
3077 | In order to enable H_PUT_TCE_INDIRECT and H_STUFF_TCE use in the guest, | |
3078 | user space might have to advertise it for the guest. For example, | |
3079 | IBM pSeries (sPAPR) guest starts using them if "hcall-multi-tce" is | |
3080 | present in the "ibm,hypertas-functions" device-tree property. | |
3081 | ||
3082 | The hypercalls mentioned above may or may not be processed successfully | |
3083 | in the kernel based fast path. If they can not be handled by the kernel, | |
3084 | they will get passed on to user space. So user space still has to have | |
3085 | an implementation for these despite the in kernel acceleration. | |
3086 | ||
3087 | This capability is always enabled. | |
3088 | ||
58ded420 AK |
3089 | 4.98 KVM_CREATE_SPAPR_TCE_64 |
3090 | ||
3091 | Capability: KVM_CAP_SPAPR_TCE_64 | |
3092 | Architectures: powerpc | |
3093 | Type: vm ioctl | |
3094 | Parameters: struct kvm_create_spapr_tce_64 (in) | |
3095 | Returns: file descriptor for manipulating the created TCE table | |
3096 | ||
3097 | This is an extension for KVM_CAP_SPAPR_TCE which only supports 32bit | |
3098 | windows, described in 4.62 KVM_CREATE_SPAPR_TCE | |
3099 | ||
3100 | This capability uses extended struct in ioctl interface: | |
3101 | ||
3102 | /* for KVM_CAP_SPAPR_TCE_64 */ | |
3103 | struct kvm_create_spapr_tce_64 { | |
3104 | __u64 liobn; | |
3105 | __u32 page_shift; | |
3106 | __u32 flags; | |
3107 | __u64 offset; /* in pages */ | |
3108 | __u64 size; /* in pages */ | |
3109 | }; | |
3110 | ||
3111 | The aim of extension is to support an additional bigger DMA window with | |
3112 | a variable page size. | |
3113 | KVM_CREATE_SPAPR_TCE_64 receives a 64bit window size, an IOMMU page shift and | |
3114 | a bus offset of the corresponding DMA window, @size and @offset are numbers | |
3115 | of IOMMU pages. | |
3116 | ||
3117 | @flags are not used at the moment. | |
3118 | ||
3119 | The rest of functionality is identical to KVM_CREATE_SPAPR_TCE. | |
3120 | ||
107d44a2 RK |
3121 | 4.98 KVM_REINJECT_CONTROL |
3122 | ||
3123 | Capability: KVM_CAP_REINJECT_CONTROL | |
3124 | Architectures: x86 | |
3125 | Type: vm ioctl | |
3126 | Parameters: struct kvm_reinject_control (in) | |
3127 | Returns: 0 on success, | |
3128 | -EFAULT if struct kvm_reinject_control cannot be read, | |
3129 | -ENXIO if KVM_CREATE_PIT or KVM_CREATE_PIT2 didn't succeed earlier. | |
3130 | ||
3131 | i8254 (PIT) has two modes, reinject and !reinject. The default is reinject, | |
3132 | where KVM queues elapsed i8254 ticks and monitors completion of interrupt from | |
3133 | vector(s) that i8254 injects. Reinject mode dequeues a tick and injects its | |
3134 | interrupt whenever there isn't a pending interrupt from i8254. | |
3135 | !reinject mode injects an interrupt as soon as a tick arrives. | |
3136 | ||
3137 | struct kvm_reinject_control { | |
3138 | __u8 pit_reinject; | |
3139 | __u8 reserved[31]; | |
3140 | }; | |
3141 | ||
3142 | pit_reinject = 0 (!reinject mode) is recommended, unless running an old | |
3143 | operating system that uses the PIT for timing (e.g. Linux 2.4.x). | |
3144 | ||
9c1b96e3 | 3145 | 5. The kvm_run structure |
414fa985 | 3146 | ------------------------ |
9c1b96e3 AK |
3147 | |
3148 | Application code obtains a pointer to the kvm_run structure by | |
3149 | mmap()ing a vcpu fd. From that point, application code can control | |
3150 | execution by changing fields in kvm_run prior to calling the KVM_RUN | |
3151 | ioctl, and obtain information about the reason KVM_RUN returned by | |
3152 | looking up structure members. | |
3153 | ||
3154 | struct kvm_run { | |
3155 | /* in */ | |
3156 | __u8 request_interrupt_window; | |
3157 | ||
3158 | Request that KVM_RUN return when it becomes possible to inject external | |
3159 | interrupts into the guest. Useful in conjunction with KVM_INTERRUPT. | |
3160 | ||
3161 | __u8 padding1[7]; | |
3162 | ||
3163 | /* out */ | |
3164 | __u32 exit_reason; | |
3165 | ||
3166 | When KVM_RUN has returned successfully (return value 0), this informs | |
3167 | application code why KVM_RUN has returned. Allowable values for this | |
3168 | field are detailed below. | |
3169 | ||
3170 | __u8 ready_for_interrupt_injection; | |
3171 | ||
3172 | If request_interrupt_window has been specified, this field indicates | |
3173 | an interrupt can be injected now with KVM_INTERRUPT. | |
3174 | ||
3175 | __u8 if_flag; | |
3176 | ||
3177 | The value of the current interrupt flag. Only valid if in-kernel | |
3178 | local APIC is not used. | |
3179 | ||
f077825a PB |
3180 | __u16 flags; |
3181 | ||
3182 | More architecture-specific flags detailing state of the VCPU that may | |
3183 | affect the device's behavior. The only currently defined flag is | |
3184 | KVM_RUN_X86_SMM, which is valid on x86 machines and is set if the | |
3185 | VCPU is in system management mode. | |
9c1b96e3 AK |
3186 | |
3187 | /* in (pre_kvm_run), out (post_kvm_run) */ | |
3188 | __u64 cr8; | |
3189 | ||
3190 | The value of the cr8 register. Only valid if in-kernel local APIC is | |
3191 | not used. Both input and output. | |
3192 | ||
3193 | __u64 apic_base; | |
3194 | ||
3195 | The value of the APIC BASE msr. Only valid if in-kernel local | |
3196 | APIC is not used. Both input and output. | |
3197 | ||
3198 | union { | |
3199 | /* KVM_EXIT_UNKNOWN */ | |
3200 | struct { | |
3201 | __u64 hardware_exit_reason; | |
3202 | } hw; | |
3203 | ||
3204 | If exit_reason is KVM_EXIT_UNKNOWN, the vcpu has exited due to unknown | |
3205 | reasons. Further architecture-specific information is available in | |
3206 | hardware_exit_reason. | |
3207 | ||
3208 | /* KVM_EXIT_FAIL_ENTRY */ | |
3209 | struct { | |
3210 | __u64 hardware_entry_failure_reason; | |
3211 | } fail_entry; | |
3212 | ||
3213 | If exit_reason is KVM_EXIT_FAIL_ENTRY, the vcpu could not be run due | |
3214 | to unknown reasons. Further architecture-specific information is | |
3215 | available in hardware_entry_failure_reason. | |
3216 | ||
3217 | /* KVM_EXIT_EXCEPTION */ | |
3218 | struct { | |
3219 | __u32 exception; | |
3220 | __u32 error_code; | |
3221 | } ex; | |
3222 | ||
3223 | Unused. | |
3224 | ||
3225 | /* KVM_EXIT_IO */ | |
3226 | struct { | |
3227 | #define KVM_EXIT_IO_IN 0 | |
3228 | #define KVM_EXIT_IO_OUT 1 | |
3229 | __u8 direction; | |
3230 | __u8 size; /* bytes */ | |
3231 | __u16 port; | |
3232 | __u32 count; | |
3233 | __u64 data_offset; /* relative to kvm_run start */ | |
3234 | } io; | |
3235 | ||
2044892d | 3236 | If exit_reason is KVM_EXIT_IO, then the vcpu has |
9c1b96e3 AK |
3237 | executed a port I/O instruction which could not be satisfied by kvm. |
3238 | data_offset describes where the data is located (KVM_EXIT_IO_OUT) or | |
3239 | where kvm expects application code to place the data for the next | |
2044892d | 3240 | KVM_RUN invocation (KVM_EXIT_IO_IN). Data format is a packed array. |
9c1b96e3 | 3241 | |
8ab30c15 | 3242 | /* KVM_EXIT_DEBUG */ |
9c1b96e3 AK |
3243 | struct { |
3244 | struct kvm_debug_exit_arch arch; | |
3245 | } debug; | |
3246 | ||
8ab30c15 AB |
3247 | If the exit_reason is KVM_EXIT_DEBUG, then a vcpu is processing a debug event |
3248 | for which architecture specific information is returned. | |
9c1b96e3 AK |
3249 | |
3250 | /* KVM_EXIT_MMIO */ | |
3251 | struct { | |
3252 | __u64 phys_addr; | |
3253 | __u8 data[8]; | |
3254 | __u32 len; | |
3255 | __u8 is_write; | |
3256 | } mmio; | |
3257 | ||
2044892d | 3258 | If exit_reason is KVM_EXIT_MMIO, then the vcpu has |
9c1b96e3 AK |
3259 | executed a memory-mapped I/O instruction which could not be satisfied |
3260 | by kvm. The 'data' member contains the written data if 'is_write' is | |
3261 | true, and should be filled by application code otherwise. | |
3262 | ||
6acdb160 CD |
3263 | The 'data' member contains, in its first 'len' bytes, the value as it would |
3264 | appear if the VCPU performed a load or store of the appropriate width directly | |
3265 | to the byte array. | |
3266 | ||
cc568ead | 3267 | NOTE: For KVM_EXIT_IO, KVM_EXIT_MMIO, KVM_EXIT_OSI, KVM_EXIT_PAPR and |
ce91ddc4 | 3268 | KVM_EXIT_EPR the corresponding |
ad0a048b AG |
3269 | operations are complete (and guest state is consistent) only after userspace |
3270 | has re-entered the kernel with KVM_RUN. The kernel side will first finish | |
67961344 MT |
3271 | incomplete operations and then check for pending signals. Userspace |
3272 | can re-enter the guest with an unmasked signal pending to complete | |
3273 | pending operations. | |
3274 | ||
9c1b96e3 AK |
3275 | /* KVM_EXIT_HYPERCALL */ |
3276 | struct { | |
3277 | __u64 nr; | |
3278 | __u64 args[6]; | |
3279 | __u64 ret; | |
3280 | __u32 longmode; | |
3281 | __u32 pad; | |
3282 | } hypercall; | |
3283 | ||
647dc49e AK |
3284 | Unused. This was once used for 'hypercall to userspace'. To implement |
3285 | such functionality, use KVM_EXIT_IO (x86) or KVM_EXIT_MMIO (all except s390). | |
3286 | Note KVM_EXIT_IO is significantly faster than KVM_EXIT_MMIO. | |
9c1b96e3 AK |
3287 | |
3288 | /* KVM_EXIT_TPR_ACCESS */ | |
3289 | struct { | |
3290 | __u64 rip; | |
3291 | __u32 is_write; | |
3292 | __u32 pad; | |
3293 | } tpr_access; | |
3294 | ||
3295 | To be documented (KVM_TPR_ACCESS_REPORTING). | |
3296 | ||
3297 | /* KVM_EXIT_S390_SIEIC */ | |
3298 | struct { | |
3299 | __u8 icptcode; | |
3300 | __u64 mask; /* psw upper half */ | |
3301 | __u64 addr; /* psw lower half */ | |
3302 | __u16 ipa; | |
3303 | __u32 ipb; | |
3304 | } s390_sieic; | |
3305 | ||
3306 | s390 specific. | |
3307 | ||
3308 | /* KVM_EXIT_S390_RESET */ | |
3309 | #define KVM_S390_RESET_POR 1 | |
3310 | #define KVM_S390_RESET_CLEAR 2 | |
3311 | #define KVM_S390_RESET_SUBSYSTEM 4 | |
3312 | #define KVM_S390_RESET_CPU_INIT 8 | |
3313 | #define KVM_S390_RESET_IPL 16 | |
3314 | __u64 s390_reset_flags; | |
3315 | ||
3316 | s390 specific. | |
3317 | ||
e168bf8d CO |
3318 | /* KVM_EXIT_S390_UCONTROL */ |
3319 | struct { | |
3320 | __u64 trans_exc_code; | |
3321 | __u32 pgm_code; | |
3322 | } s390_ucontrol; | |
3323 | ||
3324 | s390 specific. A page fault has occurred for a user controlled virtual | |
3325 | machine (KVM_VM_S390_UNCONTROL) on it's host page table that cannot be | |
3326 | resolved by the kernel. | |
3327 | The program code and the translation exception code that were placed | |
3328 | in the cpu's lowcore are presented here as defined by the z Architecture | |
3329 | Principles of Operation Book in the Chapter for Dynamic Address Translation | |
3330 | (DAT) | |
3331 | ||
9c1b96e3 AK |
3332 | /* KVM_EXIT_DCR */ |
3333 | struct { | |
3334 | __u32 dcrn; | |
3335 | __u32 data; | |
3336 | __u8 is_write; | |
3337 | } dcr; | |
3338 | ||
ce91ddc4 | 3339 | Deprecated - was used for 440 KVM. |
9c1b96e3 | 3340 | |
ad0a048b AG |
3341 | /* KVM_EXIT_OSI */ |
3342 | struct { | |
3343 | __u64 gprs[32]; | |
3344 | } osi; | |
3345 | ||
3346 | MOL uses a special hypercall interface it calls 'OSI'. To enable it, we catch | |
3347 | hypercalls and exit with this exit struct that contains all the guest gprs. | |
3348 | ||
3349 | If exit_reason is KVM_EXIT_OSI, then the vcpu has triggered such a hypercall. | |
3350 | Userspace can now handle the hypercall and when it's done modify the gprs as | |
3351 | necessary. Upon guest entry all guest GPRs will then be replaced by the values | |
3352 | in this struct. | |
3353 | ||
de56a948 PM |
3354 | /* KVM_EXIT_PAPR_HCALL */ |
3355 | struct { | |
3356 | __u64 nr; | |
3357 | __u64 ret; | |
3358 | __u64 args[9]; | |
3359 | } papr_hcall; | |
3360 | ||
3361 | This is used on 64-bit PowerPC when emulating a pSeries partition, | |
3362 | e.g. with the 'pseries' machine type in qemu. It occurs when the | |
3363 | guest does a hypercall using the 'sc 1' instruction. The 'nr' field | |
3364 | contains the hypercall number (from the guest R3), and 'args' contains | |
3365 | the arguments (from the guest R4 - R12). Userspace should put the | |
3366 | return code in 'ret' and any extra returned values in args[]. | |
3367 | The possible hypercalls are defined in the Power Architecture Platform | |
3368 | Requirements (PAPR) document available from www.power.org (free | |
3369 | developer registration required to access it). | |
3370 | ||
fa6b7fe9 CH |
3371 | /* KVM_EXIT_S390_TSCH */ |
3372 | struct { | |
3373 | __u16 subchannel_id; | |
3374 | __u16 subchannel_nr; | |
3375 | __u32 io_int_parm; | |
3376 | __u32 io_int_word; | |
3377 | __u32 ipb; | |
3378 | __u8 dequeued; | |
3379 | } s390_tsch; | |
3380 | ||
3381 | s390 specific. This exit occurs when KVM_CAP_S390_CSS_SUPPORT has been enabled | |
3382 | and TEST SUBCHANNEL was intercepted. If dequeued is set, a pending I/O | |
3383 | interrupt for the target subchannel has been dequeued and subchannel_id, | |
3384 | subchannel_nr, io_int_parm and io_int_word contain the parameters for that | |
3385 | interrupt. ipb is needed for instruction parameter decoding. | |
3386 | ||
1c810636 AG |
3387 | /* KVM_EXIT_EPR */ |
3388 | struct { | |
3389 | __u32 epr; | |
3390 | } epr; | |
3391 | ||
3392 | On FSL BookE PowerPC chips, the interrupt controller has a fast patch | |
3393 | interrupt acknowledge path to the core. When the core successfully | |
3394 | delivers an interrupt, it automatically populates the EPR register with | |
3395 | the interrupt vector number and acknowledges the interrupt inside | |
3396 | the interrupt controller. | |
3397 | ||
3398 | In case the interrupt controller lives in user space, we need to do | |
3399 | the interrupt acknowledge cycle through it to fetch the next to be | |
3400 | delivered interrupt vector using this exit. | |
3401 | ||
3402 | It gets triggered whenever both KVM_CAP_PPC_EPR are enabled and an | |
3403 | external interrupt has just been delivered into the guest. User space | |
3404 | should put the acknowledged interrupt vector into the 'epr' field. | |
3405 | ||
8ad6b634 AP |
3406 | /* KVM_EXIT_SYSTEM_EVENT */ |
3407 | struct { | |
3408 | #define KVM_SYSTEM_EVENT_SHUTDOWN 1 | |
3409 | #define KVM_SYSTEM_EVENT_RESET 2 | |
2ce79189 | 3410 | #define KVM_SYSTEM_EVENT_CRASH 3 |
8ad6b634 AP |
3411 | __u32 type; |
3412 | __u64 flags; | |
3413 | } system_event; | |
3414 | ||
3415 | If exit_reason is KVM_EXIT_SYSTEM_EVENT then the vcpu has triggered | |
3416 | a system-level event using some architecture specific mechanism (hypercall | |
3417 | or some special instruction). In case of ARM/ARM64, this is triggered using | |
3418 | HVC instruction based PSCI call from the vcpu. The 'type' field describes | |
3419 | the system-level event type. The 'flags' field describes architecture | |
3420 | specific flags for the system-level event. | |
3421 | ||
cf5d3188 CD |
3422 | Valid values for 'type' are: |
3423 | KVM_SYSTEM_EVENT_SHUTDOWN -- the guest has requested a shutdown of the | |
3424 | VM. Userspace is not obliged to honour this, and if it does honour | |
3425 | this does not need to destroy the VM synchronously (ie it may call | |
3426 | KVM_RUN again before shutdown finally occurs). | |
3427 | KVM_SYSTEM_EVENT_RESET -- the guest has requested a reset of the VM. | |
3428 | As with SHUTDOWN, userspace can choose to ignore the request, or | |
3429 | to schedule the reset to occur in the future and may call KVM_RUN again. | |
2ce79189 AS |
3430 | KVM_SYSTEM_EVENT_CRASH -- the guest crash occurred and the guest |
3431 | has requested a crash condition maintenance. Userspace can choose | |
3432 | to ignore the request, or to gather VM memory core dump and/or | |
3433 | reset/shutdown of the VM. | |
cf5d3188 | 3434 | |
7543a635 SR |
3435 | /* KVM_EXIT_IOAPIC_EOI */ |
3436 | struct { | |
3437 | __u8 vector; | |
3438 | } eoi; | |
3439 | ||
3440 | Indicates that the VCPU's in-kernel local APIC received an EOI for a | |
3441 | level-triggered IOAPIC interrupt. This exit only triggers when the | |
3442 | IOAPIC is implemented in userspace (i.e. KVM_CAP_SPLIT_IRQCHIP is enabled); | |
3443 | the userspace IOAPIC should process the EOI and retrigger the interrupt if | |
3444 | it is still asserted. Vector is the LAPIC interrupt vector for which the | |
3445 | EOI was received. | |
3446 | ||
db397571 AS |
3447 | struct kvm_hyperv_exit { |
3448 | #define KVM_EXIT_HYPERV_SYNIC 1 | |
83326e43 | 3449 | #define KVM_EXIT_HYPERV_HCALL 2 |
db397571 AS |
3450 | __u32 type; |
3451 | union { | |
3452 | struct { | |
3453 | __u32 msr; | |
3454 | __u64 control; | |
3455 | __u64 evt_page; | |
3456 | __u64 msg_page; | |
3457 | } synic; | |
83326e43 AS |
3458 | struct { |
3459 | __u64 input; | |
3460 | __u64 result; | |
3461 | __u64 params[2]; | |
3462 | } hcall; | |
db397571 AS |
3463 | } u; |
3464 | }; | |
3465 | /* KVM_EXIT_HYPERV */ | |
3466 | struct kvm_hyperv_exit hyperv; | |
3467 | Indicates that the VCPU exits into userspace to process some tasks | |
3468 | related to Hyper-V emulation. | |
3469 | Valid values for 'type' are: | |
3470 | KVM_EXIT_HYPERV_SYNIC -- synchronously notify user-space about | |
3471 | Hyper-V SynIC state change. Notification is used to remap SynIC | |
3472 | event/message pages and to enable/disable SynIC messages/events processing | |
3473 | in userspace. | |
3474 | ||
9c1b96e3 AK |
3475 | /* Fix the size of the union. */ |
3476 | char padding[256]; | |
3477 | }; | |
b9e5dc8d CB |
3478 | |
3479 | /* | |
3480 | * shared registers between kvm and userspace. | |
3481 | * kvm_valid_regs specifies the register classes set by the host | |
3482 | * kvm_dirty_regs specified the register classes dirtied by userspace | |
3483 | * struct kvm_sync_regs is architecture specific, as well as the | |
3484 | * bits for kvm_valid_regs and kvm_dirty_regs | |
3485 | */ | |
3486 | __u64 kvm_valid_regs; | |
3487 | __u64 kvm_dirty_regs; | |
3488 | union { | |
3489 | struct kvm_sync_regs regs; | |
3490 | char padding[1024]; | |
3491 | } s; | |
3492 | ||
3493 | If KVM_CAP_SYNC_REGS is defined, these fields allow userspace to access | |
3494 | certain guest registers without having to call SET/GET_*REGS. Thus we can | |
3495 | avoid some system call overhead if userspace has to handle the exit. | |
3496 | Userspace can query the validity of the structure by checking | |
3497 | kvm_valid_regs for specific bits. These bits are architecture specific | |
3498 | and usually define the validity of a groups of registers. (e.g. one bit | |
3499 | for general purpose registers) | |
3500 | ||
d8482c0d DH |
3501 | Please note that the kernel is allowed to use the kvm_run structure as the |
3502 | primary storage for certain register types. Therefore, the kernel may use the | |
3503 | values in kvm_run even if the corresponding bit in kvm_dirty_regs is not set. | |
3504 | ||
9c1b96e3 | 3505 | }; |
821246a5 | 3506 | |
414fa985 | 3507 | |
9c15bb1d | 3508 | |
699a0ea0 PM |
3509 | 6. Capabilities that can be enabled on vCPUs |
3510 | -------------------------------------------- | |
821246a5 | 3511 | |
0907c855 CH |
3512 | There are certain capabilities that change the behavior of the virtual CPU or |
3513 | the virtual machine when enabled. To enable them, please see section 4.37. | |
3514 | Below you can find a list of capabilities and what their effect on the vCPU or | |
3515 | the virtual machine is when enabling them. | |
821246a5 AG |
3516 | |
3517 | The following information is provided along with the description: | |
3518 | ||
3519 | Architectures: which instruction set architectures provide this ioctl. | |
3520 | x86 includes both i386 and x86_64. | |
3521 | ||
0907c855 CH |
3522 | Target: whether this is a per-vcpu or per-vm capability. |
3523 | ||
821246a5 AG |
3524 | Parameters: what parameters are accepted by the capability. |
3525 | ||
3526 | Returns: the return value. General error numbers (EBADF, ENOMEM, EINVAL) | |
3527 | are not detailed, but errors with specific meanings are. | |
3528 | ||
414fa985 | 3529 | |
821246a5 AG |
3530 | 6.1 KVM_CAP_PPC_OSI |
3531 | ||
3532 | Architectures: ppc | |
0907c855 | 3533 | Target: vcpu |
821246a5 AG |
3534 | Parameters: none |
3535 | Returns: 0 on success; -1 on error | |
3536 | ||
3537 | This capability enables interception of OSI hypercalls that otherwise would | |
3538 | be treated as normal system calls to be injected into the guest. OSI hypercalls | |
3539 | were invented by Mac-on-Linux to have a standardized communication mechanism | |
3540 | between the guest and the host. | |
3541 | ||
3542 | When this capability is enabled, KVM_EXIT_OSI can occur. | |
3543 | ||
414fa985 | 3544 | |
821246a5 AG |
3545 | 6.2 KVM_CAP_PPC_PAPR |
3546 | ||
3547 | Architectures: ppc | |
0907c855 | 3548 | Target: vcpu |
821246a5 AG |
3549 | Parameters: none |
3550 | Returns: 0 on success; -1 on error | |
3551 | ||
3552 | This capability enables interception of PAPR hypercalls. PAPR hypercalls are | |
3553 | done using the hypercall instruction "sc 1". | |
3554 | ||
3555 | It also sets the guest privilege level to "supervisor" mode. Usually the guest | |
3556 | runs in "hypervisor" privilege mode with a few missing features. | |
3557 | ||
3558 | In addition to the above, it changes the semantics of SDR1. In this mode, the | |
3559 | HTAB address part of SDR1 contains an HVA instead of a GPA, as PAPR keeps the | |
3560 | HTAB invisible to the guest. | |
3561 | ||
3562 | When this capability is enabled, KVM_EXIT_PAPR_HCALL can occur. | |
dc83b8bc | 3563 | |
414fa985 | 3564 | |
dc83b8bc SW |
3565 | 6.3 KVM_CAP_SW_TLB |
3566 | ||
3567 | Architectures: ppc | |
0907c855 | 3568 | Target: vcpu |
dc83b8bc SW |
3569 | Parameters: args[0] is the address of a struct kvm_config_tlb |
3570 | Returns: 0 on success; -1 on error | |
3571 | ||
3572 | struct kvm_config_tlb { | |
3573 | __u64 params; | |
3574 | __u64 array; | |
3575 | __u32 mmu_type; | |
3576 | __u32 array_len; | |
3577 | }; | |
3578 | ||
3579 | Configures the virtual CPU's TLB array, establishing a shared memory area | |
3580 | between userspace and KVM. The "params" and "array" fields are userspace | |
3581 | addresses of mmu-type-specific data structures. The "array_len" field is an | |
3582 | safety mechanism, and should be set to the size in bytes of the memory that | |
3583 | userspace has reserved for the array. It must be at least the size dictated | |
3584 | by "mmu_type" and "params". | |
3585 | ||
3586 | While KVM_RUN is active, the shared region is under control of KVM. Its | |
3587 | contents are undefined, and any modification by userspace results in | |
3588 | boundedly undefined behavior. | |
3589 | ||
3590 | On return from KVM_RUN, the shared region will reflect the current state of | |
3591 | the guest's TLB. If userspace makes any changes, it must call KVM_DIRTY_TLB | |
3592 | to tell KVM which entries have been changed, prior to calling KVM_RUN again | |
3593 | on this vcpu. | |
3594 | ||
3595 | For mmu types KVM_MMU_FSL_BOOKE_NOHV and KVM_MMU_FSL_BOOKE_HV: | |
3596 | - The "params" field is of type "struct kvm_book3e_206_tlb_params". | |
3597 | - The "array" field points to an array of type "struct | |
3598 | kvm_book3e_206_tlb_entry". | |
3599 | - The array consists of all entries in the first TLB, followed by all | |
3600 | entries in the second TLB. | |
3601 | - Within a TLB, entries are ordered first by increasing set number. Within a | |
3602 | set, entries are ordered by way (increasing ESEL). | |
3603 | - The hash for determining set number in TLB0 is: (MAS2 >> 12) & (num_sets - 1) | |
3604 | where "num_sets" is the tlb_sizes[] value divided by the tlb_ways[] value. | |
3605 | - The tsize field of mas1 shall be set to 4K on TLB0, even though the | |
3606 | hardware ignores this value for TLB0. | |
fa6b7fe9 CH |
3607 | |
3608 | 6.4 KVM_CAP_S390_CSS_SUPPORT | |
3609 | ||
3610 | Architectures: s390 | |
0907c855 | 3611 | Target: vcpu |
fa6b7fe9 CH |
3612 | Parameters: none |
3613 | Returns: 0 on success; -1 on error | |
3614 | ||
3615 | This capability enables support for handling of channel I/O instructions. | |
3616 | ||
3617 | TEST PENDING INTERRUPTION and the interrupt portion of TEST SUBCHANNEL are | |
3618 | handled in-kernel, while the other I/O instructions are passed to userspace. | |
3619 | ||
3620 | When this capability is enabled, KVM_EXIT_S390_TSCH will occur on TEST | |
3621 | SUBCHANNEL intercepts. | |
1c810636 | 3622 | |
0907c855 CH |
3623 | Note that even though this capability is enabled per-vcpu, the complete |
3624 | virtual machine is affected. | |
3625 | ||
1c810636 AG |
3626 | 6.5 KVM_CAP_PPC_EPR |
3627 | ||
3628 | Architectures: ppc | |
0907c855 | 3629 | Target: vcpu |
1c810636 AG |
3630 | Parameters: args[0] defines whether the proxy facility is active |
3631 | Returns: 0 on success; -1 on error | |
3632 | ||
3633 | This capability enables or disables the delivery of interrupts through the | |
3634 | external proxy facility. | |
3635 | ||
3636 | When enabled (args[0] != 0), every time the guest gets an external interrupt | |
3637 | delivered, it automatically exits into user space with a KVM_EXIT_EPR exit | |
3638 | to receive the topmost interrupt vector. | |
3639 | ||
3640 | When disabled (args[0] == 0), behavior is as if this facility is unsupported. | |
3641 | ||
3642 | When this capability is enabled, KVM_EXIT_EPR can occur. | |
eb1e4f43 SW |
3643 | |
3644 | 6.6 KVM_CAP_IRQ_MPIC | |
3645 | ||
3646 | Architectures: ppc | |
3647 | Parameters: args[0] is the MPIC device fd | |
3648 | args[1] is the MPIC CPU number for this vcpu | |
3649 | ||
3650 | This capability connects the vcpu to an in-kernel MPIC device. | |
5975a2e0 PM |
3651 | |
3652 | 6.7 KVM_CAP_IRQ_XICS | |
3653 | ||
3654 | Architectures: ppc | |
0907c855 | 3655 | Target: vcpu |
5975a2e0 PM |
3656 | Parameters: args[0] is the XICS device fd |
3657 | args[1] is the XICS CPU number (server ID) for this vcpu | |
3658 | ||
3659 | This capability connects the vcpu to an in-kernel XICS device. | |
8a366a4b CH |
3660 | |
3661 | 6.8 KVM_CAP_S390_IRQCHIP | |
3662 | ||
3663 | Architectures: s390 | |
3664 | Target: vm | |
3665 | Parameters: none | |
3666 | ||
3667 | This capability enables the in-kernel irqchip for s390. Please refer to | |
3668 | "4.24 KVM_CREATE_IRQCHIP" for details. | |
699a0ea0 | 3669 | |
5fafd874 JH |
3670 | 6.9 KVM_CAP_MIPS_FPU |
3671 | ||
3672 | Architectures: mips | |
3673 | Target: vcpu | |
3674 | Parameters: args[0] is reserved for future use (should be 0). | |
3675 | ||
3676 | This capability allows the use of the host Floating Point Unit by the guest. It | |
3677 | allows the Config1.FP bit to be set to enable the FPU in the guest. Once this is | |
3678 | done the KVM_REG_MIPS_FPR_* and KVM_REG_MIPS_FCR_* registers can be accessed | |
3679 | (depending on the current guest FPU register mode), and the Status.FR, | |
3680 | Config5.FRE bits are accessible via the KVM API and also from the guest, | |
3681 | depending on them being supported by the FPU. | |
3682 | ||
d952bd07 JH |
3683 | 6.10 KVM_CAP_MIPS_MSA |
3684 | ||
3685 | Architectures: mips | |
3686 | Target: vcpu | |
3687 | Parameters: args[0] is reserved for future use (should be 0). | |
3688 | ||
3689 | This capability allows the use of the MIPS SIMD Architecture (MSA) by the guest. | |
3690 | It allows the Config3.MSAP bit to be set to enable the use of MSA by the guest. | |
3691 | Once this is done the KVM_REG_MIPS_VEC_* and KVM_REG_MIPS_MSA_* registers can be | |
3692 | accessed, and the Config5.MSAEn bit is accessible via the KVM API and also from | |
3693 | the guest. | |
3694 | ||
699a0ea0 PM |
3695 | 7. Capabilities that can be enabled on VMs |
3696 | ------------------------------------------ | |
3697 | ||
3698 | There are certain capabilities that change the behavior of the virtual | |
3699 | machine when enabled. To enable them, please see section 4.37. Below | |
3700 | you can find a list of capabilities and what their effect on the VM | |
3701 | is when enabling them. | |
3702 | ||
3703 | The following information is provided along with the description: | |
3704 | ||
3705 | Architectures: which instruction set architectures provide this ioctl. | |
3706 | x86 includes both i386 and x86_64. | |
3707 | ||
3708 | Parameters: what parameters are accepted by the capability. | |
3709 | ||
3710 | Returns: the return value. General error numbers (EBADF, ENOMEM, EINVAL) | |
3711 | are not detailed, but errors with specific meanings are. | |
3712 | ||
3713 | ||
3714 | 7.1 KVM_CAP_PPC_ENABLE_HCALL | |
3715 | ||
3716 | Architectures: ppc | |
3717 | Parameters: args[0] is the sPAPR hcall number | |
3718 | args[1] is 0 to disable, 1 to enable in-kernel handling | |
3719 | ||
3720 | This capability controls whether individual sPAPR hypercalls (hcalls) | |
3721 | get handled by the kernel or not. Enabling or disabling in-kernel | |
3722 | handling of an hcall is effective across the VM. On creation, an | |
3723 | initial set of hcalls are enabled for in-kernel handling, which | |
3724 | consists of those hcalls for which in-kernel handlers were implemented | |
3725 | before this capability was implemented. If disabled, the kernel will | |
3726 | not to attempt to handle the hcall, but will always exit to userspace | |
3727 | to handle it. Note that it may not make sense to enable some and | |
3728 | disable others of a group of related hcalls, but KVM does not prevent | |
3729 | userspace from doing that. | |
ae2113a4 PM |
3730 | |
3731 | If the hcall number specified is not one that has an in-kernel | |
3732 | implementation, the KVM_ENABLE_CAP ioctl will fail with an EINVAL | |
3733 | error. | |
2444b352 DH |
3734 | |
3735 | 7.2 KVM_CAP_S390_USER_SIGP | |
3736 | ||
3737 | Architectures: s390 | |
3738 | Parameters: none | |
3739 | ||
3740 | This capability controls which SIGP orders will be handled completely in user | |
3741 | space. With this capability enabled, all fast orders will be handled completely | |
3742 | in the kernel: | |
3743 | - SENSE | |
3744 | - SENSE RUNNING | |
3745 | - EXTERNAL CALL | |
3746 | - EMERGENCY SIGNAL | |
3747 | - CONDITIONAL EMERGENCY SIGNAL | |
3748 | ||
3749 | All other orders will be handled completely in user space. | |
3750 | ||
3751 | Only privileged operation exceptions will be checked for in the kernel (or even | |
3752 | in the hardware prior to interception). If this capability is not enabled, the | |
3753 | old way of handling SIGP orders is used (partially in kernel and user space). | |
68c55750 EF |
3754 | |
3755 | 7.3 KVM_CAP_S390_VECTOR_REGISTERS | |
3756 | ||
3757 | Architectures: s390 | |
3758 | Parameters: none | |
3759 | Returns: 0 on success, negative value on error | |
3760 | ||
3761 | Allows use of the vector registers introduced with z13 processor, and | |
3762 | provides for the synchronization between host and user space. Will | |
3763 | return -EINVAL if the machine does not support vectors. | |
e44fc8c9 ET |
3764 | |
3765 | 7.4 KVM_CAP_S390_USER_STSI | |
3766 | ||
3767 | Architectures: s390 | |
3768 | Parameters: none | |
3769 | ||
3770 | This capability allows post-handlers for the STSI instruction. After | |
3771 | initial handling in the kernel, KVM exits to user space with | |
3772 | KVM_EXIT_S390_STSI to allow user space to insert further data. | |
3773 | ||
3774 | Before exiting to userspace, kvm handlers should fill in s390_stsi field of | |
3775 | vcpu->run: | |
3776 | struct { | |
3777 | __u64 addr; | |
3778 | __u8 ar; | |
3779 | __u8 reserved; | |
3780 | __u8 fc; | |
3781 | __u8 sel1; | |
3782 | __u16 sel2; | |
3783 | } s390_stsi; | |
3784 | ||
3785 | @addr - guest address of STSI SYSIB | |
3786 | @fc - function code | |
3787 | @sel1 - selector 1 | |
3788 | @sel2 - selector 2 | |
3789 | @ar - access register number | |
3790 | ||
3791 | KVM handlers should exit to userspace with rc = -EREMOTE. | |
e928e9cb | 3792 | |
49df6397 SR |
3793 | 7.5 KVM_CAP_SPLIT_IRQCHIP |
3794 | ||
3795 | Architectures: x86 | |
b053b2ae | 3796 | Parameters: args[0] - number of routes reserved for userspace IOAPICs |
49df6397 SR |
3797 | Returns: 0 on success, -1 on error |
3798 | ||
3799 | Create a local apic for each processor in the kernel. This can be used | |
3800 | instead of KVM_CREATE_IRQCHIP if the userspace VMM wishes to emulate the | |
3801 | IOAPIC and PIC (and also the PIT, even though this has to be enabled | |
3802 | separately). | |
3803 | ||
b053b2ae SR |
3804 | This capability also enables in kernel routing of interrupt requests; |
3805 | when KVM_CAP_SPLIT_IRQCHIP only routes of KVM_IRQ_ROUTING_MSI type are | |
3806 | used in the IRQ routing table. The first args[0] MSI routes are reserved | |
3807 | for the IOAPIC pins. Whenever the LAPIC receives an EOI for these routes, | |
3808 | a KVM_EXIT_IOAPIC_EOI vmexit will be reported to userspace. | |
49df6397 SR |
3809 | |
3810 | Fails if VCPU has already been created, or if the irqchip is already in the | |
3811 | kernel (i.e. KVM_CREATE_IRQCHIP has already been called). | |
3812 | ||
051c87f7 DH |
3813 | 7.6 KVM_CAP_S390_RI |
3814 | ||
3815 | Architectures: s390 | |
3816 | Parameters: none | |
3817 | ||
3818 | Allows use of runtime-instrumentation introduced with zEC12 processor. | |
3819 | Will return -EINVAL if the machine does not support runtime-instrumentation. | |
3820 | Will return -EBUSY if a VCPU has already been created. | |
e928e9cb ME |
3821 | |
3822 | 8. Other capabilities. | |
3823 | ---------------------- | |
3824 | ||
3825 | This section lists capabilities that give information about other | |
3826 | features of the KVM implementation. | |
3827 | ||
3828 | 8.1 KVM_CAP_PPC_HWRNG | |
3829 | ||
3830 | Architectures: ppc | |
3831 | ||
3832 | This capability, if KVM_CHECK_EXTENSION indicates that it is | |
3833 | available, means that that the kernel has an implementation of the | |
3834 | H_RANDOM hypercall backed by a hardware random-number generator. | |
3835 | If present, the kernel H_RANDOM handler can be enabled for guest use | |
3836 | with the KVM_CAP_PPC_ENABLE_HCALL capability. | |
5c919412 AS |
3837 | |
3838 | 8.2 KVM_CAP_HYPERV_SYNIC | |
3839 | ||
3840 | Architectures: x86 | |
3841 | This capability, if KVM_CHECK_EXTENSION indicates that it is | |
3842 | available, means that that the kernel has an implementation of the | |
3843 | Hyper-V Synthetic interrupt controller(SynIC). Hyper-V SynIC is | |
3844 | used to support Windows Hyper-V based guest paravirt drivers(VMBus). | |
3845 | ||
3846 | In order to use SynIC, it has to be activated by setting this | |
3847 | capability via KVM_ENABLE_CAP ioctl on the vcpu fd. Note that this | |
3848 | will disable the use of APIC hardware virtualization even if supported | |
3849 | by the CPU, as it's incompatible with SynIC auto-EOI behavior. |