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05330448 AL |
1 | /* |
2 | * QEMU KVM support | |
3 | * | |
4 | * Copyright IBM, Corp. 2008 | |
5832d1f2 | 5 | * Red Hat, Inc. 2008 |
05330448 AL |
6 | * |
7 | * Authors: | |
8 | * Anthony Liguori <aliguori@us.ibm.com> | |
5832d1f2 | 9 | * Glauber Costa <gcosta@redhat.com> |
05330448 AL |
10 | * |
11 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
12 | * See the COPYING file in the top-level directory. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <sys/types.h> | |
17 | #include <sys/ioctl.h> | |
18 | #include <sys/mman.h> | |
984b5181 | 19 | #include <stdarg.h> |
05330448 AL |
20 | |
21 | #include <linux/kvm.h> | |
22 | ||
23 | #include "qemu-common.h" | |
24 | #include "sysemu.h" | |
d33a1810 | 25 | #include "hw/hw.h" |
e22a25c9 | 26 | #include "gdbstub.h" |
05330448 AL |
27 | #include "kvm.h" |
28 | ||
f65ed4c1 AL |
29 | /* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */ |
30 | #define PAGE_SIZE TARGET_PAGE_SIZE | |
31 | ||
05330448 AL |
32 | //#define DEBUG_KVM |
33 | ||
34 | #ifdef DEBUG_KVM | |
35 | #define dprintf(fmt, ...) \ | |
36 | do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) | |
37 | #else | |
38 | #define dprintf(fmt, ...) \ | |
39 | do { } while (0) | |
40 | #endif | |
41 | ||
34fc643f AL |
42 | typedef struct KVMSlot |
43 | { | |
c227f099 AL |
44 | target_phys_addr_t start_addr; |
45 | ram_addr_t memory_size; | |
46 | ram_addr_t phys_offset; | |
34fc643f AL |
47 | int slot; |
48 | int flags; | |
49 | } KVMSlot; | |
05330448 | 50 | |
5832d1f2 AL |
51 | typedef struct kvm_dirty_log KVMDirtyLog; |
52 | ||
05330448 AL |
53 | int kvm_allowed = 0; |
54 | ||
55 | struct KVMState | |
56 | { | |
57 | KVMSlot slots[32]; | |
58 | int fd; | |
59 | int vmfd; | |
f65ed4c1 | 60 | int coalesced_mmio; |
62a2744c SY |
61 | #ifdef KVM_CAP_COALESCED_MMIO |
62 | struct kvm_coalesced_mmio_ring *coalesced_mmio_ring; | |
63 | #endif | |
e69917e2 | 64 | int broken_set_mem_region; |
4495d6a7 | 65 | int migration_log; |
a0fb002c | 66 | int vcpu_events; |
e22a25c9 AL |
67 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
68 | struct kvm_sw_breakpoint_head kvm_sw_breakpoints; | |
69 | #endif | |
6f725c13 GC |
70 | int irqchip_in_kernel; |
71 | int pit_in_kernel; | |
05330448 AL |
72 | }; |
73 | ||
74 | static KVMState *kvm_state; | |
75 | ||
76 | static KVMSlot *kvm_alloc_slot(KVMState *s) | |
77 | { | |
78 | int i; | |
79 | ||
80 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
62d60e8c AL |
81 | /* KVM private memory slots */ |
82 | if (i >= 8 && i < 12) | |
83 | continue; | |
05330448 AL |
84 | if (s->slots[i].memory_size == 0) |
85 | return &s->slots[i]; | |
86 | } | |
87 | ||
d3f8d37f AL |
88 | fprintf(stderr, "%s: no free slot available\n", __func__); |
89 | abort(); | |
90 | } | |
91 | ||
92 | static KVMSlot *kvm_lookup_matching_slot(KVMState *s, | |
c227f099 AL |
93 | target_phys_addr_t start_addr, |
94 | target_phys_addr_t end_addr) | |
d3f8d37f AL |
95 | { |
96 | int i; | |
97 | ||
98 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
99 | KVMSlot *mem = &s->slots[i]; | |
100 | ||
101 | if (start_addr == mem->start_addr && | |
102 | end_addr == mem->start_addr + mem->memory_size) { | |
103 | return mem; | |
104 | } | |
105 | } | |
106 | ||
05330448 AL |
107 | return NULL; |
108 | } | |
109 | ||
6152e2ae AL |
110 | /* |
111 | * Find overlapping slot with lowest start address | |
112 | */ | |
113 | static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s, | |
c227f099 AL |
114 | target_phys_addr_t start_addr, |
115 | target_phys_addr_t end_addr) | |
05330448 | 116 | { |
6152e2ae | 117 | KVMSlot *found = NULL; |
05330448 AL |
118 | int i; |
119 | ||
120 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
121 | KVMSlot *mem = &s->slots[i]; | |
122 | ||
6152e2ae AL |
123 | if (mem->memory_size == 0 || |
124 | (found && found->start_addr < mem->start_addr)) { | |
125 | continue; | |
126 | } | |
127 | ||
128 | if (end_addr > mem->start_addr && | |
129 | start_addr < mem->start_addr + mem->memory_size) { | |
130 | found = mem; | |
131 | } | |
05330448 AL |
132 | } |
133 | ||
6152e2ae | 134 | return found; |
05330448 AL |
135 | } |
136 | ||
5832d1f2 AL |
137 | static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot) |
138 | { | |
139 | struct kvm_userspace_memory_region mem; | |
140 | ||
141 | mem.slot = slot->slot; | |
142 | mem.guest_phys_addr = slot->start_addr; | |
143 | mem.memory_size = slot->memory_size; | |
5579c7f3 | 144 | mem.userspace_addr = (unsigned long)qemu_get_ram_ptr(slot->phys_offset); |
5832d1f2 | 145 | mem.flags = slot->flags; |
4495d6a7 JK |
146 | if (s->migration_log) { |
147 | mem.flags |= KVM_MEM_LOG_DIRTY_PAGES; | |
148 | } | |
5832d1f2 AL |
149 | return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem); |
150 | } | |
151 | ||
8d2ba1fb JK |
152 | static void kvm_reset_vcpu(void *opaque) |
153 | { | |
154 | CPUState *env = opaque; | |
155 | ||
caa5af0f | 156 | kvm_arch_reset_vcpu(env); |
8d2ba1fb JK |
157 | if (kvm_arch_put_registers(env)) { |
158 | fprintf(stderr, "Fatal: kvm vcpu reset failed\n"); | |
159 | abort(); | |
160 | } | |
161 | } | |
5832d1f2 | 162 | |
6f725c13 GC |
163 | int kvm_irqchip_in_kernel(void) |
164 | { | |
165 | return kvm_state->irqchip_in_kernel; | |
166 | } | |
167 | ||
168 | int kvm_pit_in_kernel(void) | |
169 | { | |
170 | return kvm_state->pit_in_kernel; | |
171 | } | |
172 | ||
173 | ||
05330448 AL |
174 | int kvm_init_vcpu(CPUState *env) |
175 | { | |
176 | KVMState *s = kvm_state; | |
177 | long mmap_size; | |
178 | int ret; | |
179 | ||
180 | dprintf("kvm_init_vcpu\n"); | |
181 | ||
984b5181 | 182 | ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index); |
05330448 AL |
183 | if (ret < 0) { |
184 | dprintf("kvm_create_vcpu failed\n"); | |
185 | goto err; | |
186 | } | |
187 | ||
188 | env->kvm_fd = ret; | |
189 | env->kvm_state = s; | |
190 | ||
191 | mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0); | |
192 | if (mmap_size < 0) { | |
193 | dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n"); | |
194 | goto err; | |
195 | } | |
196 | ||
197 | env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, | |
198 | env->kvm_fd, 0); | |
199 | if (env->kvm_run == MAP_FAILED) { | |
200 | ret = -errno; | |
201 | dprintf("mmap'ing vcpu state failed\n"); | |
202 | goto err; | |
203 | } | |
204 | ||
62a2744c SY |
205 | #ifdef KVM_CAP_COALESCED_MMIO |
206 | if (s->coalesced_mmio && !s->coalesced_mmio_ring) | |
207 | s->coalesced_mmio_ring = (void *) env->kvm_run + | |
208 | s->coalesced_mmio * PAGE_SIZE; | |
209 | #endif | |
210 | ||
05330448 | 211 | ret = kvm_arch_init_vcpu(env); |
8d2ba1fb | 212 | if (ret == 0) { |
a08d4367 | 213 | qemu_register_reset(kvm_reset_vcpu, env); |
caa5af0f | 214 | kvm_arch_reset_vcpu(env); |
8d2ba1fb JK |
215 | ret = kvm_arch_put_registers(env); |
216 | } | |
05330448 AL |
217 | err: |
218 | return ret; | |
219 | } | |
220 | ||
5832d1f2 AL |
221 | /* |
222 | * dirty pages logging control | |
223 | */ | |
c227f099 AL |
224 | static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr, |
225 | ram_addr_t size, int flags, int mask) | |
5832d1f2 AL |
226 | { |
227 | KVMState *s = kvm_state; | |
d3f8d37f | 228 | KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size); |
4495d6a7 JK |
229 | int old_flags; |
230 | ||
5832d1f2 | 231 | if (mem == NULL) { |
d3f8d37f AL |
232 | fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-" |
233 | TARGET_FMT_plx "\n", __func__, phys_addr, | |
c227f099 | 234 | (target_phys_addr_t)(phys_addr + size - 1)); |
5832d1f2 AL |
235 | return -EINVAL; |
236 | } | |
237 | ||
4495d6a7 | 238 | old_flags = mem->flags; |
5832d1f2 | 239 | |
4495d6a7 | 240 | flags = (mem->flags & ~mask) | flags; |
5832d1f2 AL |
241 | mem->flags = flags; |
242 | ||
4495d6a7 JK |
243 | /* If nothing changed effectively, no need to issue ioctl */ |
244 | if (s->migration_log) { | |
245 | flags |= KVM_MEM_LOG_DIRTY_PAGES; | |
246 | } | |
247 | if (flags == old_flags) { | |
248 | return 0; | |
249 | } | |
250 | ||
5832d1f2 AL |
251 | return kvm_set_user_memory_region(s, mem); |
252 | } | |
253 | ||
c227f099 | 254 | int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size) |
5832d1f2 | 255 | { |
d3f8d37f | 256 | return kvm_dirty_pages_log_change(phys_addr, size, |
5832d1f2 AL |
257 | KVM_MEM_LOG_DIRTY_PAGES, |
258 | KVM_MEM_LOG_DIRTY_PAGES); | |
259 | } | |
260 | ||
c227f099 | 261 | int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size) |
5832d1f2 | 262 | { |
d3f8d37f | 263 | return kvm_dirty_pages_log_change(phys_addr, size, |
5832d1f2 AL |
264 | 0, |
265 | KVM_MEM_LOG_DIRTY_PAGES); | |
266 | } | |
267 | ||
4495d6a7 JK |
268 | int kvm_set_migration_log(int enable) |
269 | { | |
270 | KVMState *s = kvm_state; | |
271 | KVMSlot *mem; | |
272 | int i, err; | |
273 | ||
274 | s->migration_log = enable; | |
275 | ||
276 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
277 | mem = &s->slots[i]; | |
278 | ||
279 | if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) { | |
280 | continue; | |
281 | } | |
282 | err = kvm_set_user_memory_region(s, mem); | |
283 | if (err) { | |
284 | return err; | |
285 | } | |
286 | } | |
287 | return 0; | |
288 | } | |
289 | ||
96c1606b AG |
290 | static int test_le_bit(unsigned long nr, unsigned char *addr) |
291 | { | |
292 | return (addr[nr >> 3] >> (nr & 7)) & 1; | |
293 | } | |
294 | ||
5832d1f2 AL |
295 | /** |
296 | * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space | |
297 | * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty(). | |
298 | * This means all bits are set to dirty. | |
299 | * | |
d3f8d37f | 300 | * @start_add: start of logged region. |
5832d1f2 AL |
301 | * @end_addr: end of logged region. |
302 | */ | |
c227f099 AL |
303 | int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, |
304 | target_phys_addr_t end_addr) | |
5832d1f2 AL |
305 | { |
306 | KVMState *s = kvm_state; | |
151f7749 | 307 | unsigned long size, allocated_size = 0; |
c227f099 AL |
308 | target_phys_addr_t phys_addr; |
309 | ram_addr_t addr; | |
151f7749 JK |
310 | KVMDirtyLog d; |
311 | KVMSlot *mem; | |
312 | int ret = 0; | |
5832d1f2 | 313 | |
151f7749 JK |
314 | d.dirty_bitmap = NULL; |
315 | while (start_addr < end_addr) { | |
316 | mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr); | |
317 | if (mem == NULL) { | |
318 | break; | |
319 | } | |
5832d1f2 | 320 | |
151f7749 JK |
321 | size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8; |
322 | if (!d.dirty_bitmap) { | |
323 | d.dirty_bitmap = qemu_malloc(size); | |
324 | } else if (size > allocated_size) { | |
325 | d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size); | |
326 | } | |
327 | allocated_size = size; | |
328 | memset(d.dirty_bitmap, 0, allocated_size); | |
5832d1f2 | 329 | |
151f7749 | 330 | d.slot = mem->slot; |
5832d1f2 | 331 | |
6e489f3f | 332 | if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) { |
151f7749 JK |
333 | dprintf("ioctl failed %d\n", errno); |
334 | ret = -1; | |
335 | break; | |
336 | } | |
5832d1f2 | 337 | |
151f7749 JK |
338 | for (phys_addr = mem->start_addr, addr = mem->phys_offset; |
339 | phys_addr < mem->start_addr + mem->memory_size; | |
340 | phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) { | |
96c1606b | 341 | unsigned char *bitmap = (unsigned char *)d.dirty_bitmap; |
151f7749 | 342 | unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS; |
151f7749 | 343 | |
96c1606b | 344 | if (test_le_bit(nr, bitmap)) { |
151f7749 JK |
345 | cpu_physical_memory_set_dirty(addr); |
346 | } | |
347 | } | |
348 | start_addr = phys_addr; | |
5832d1f2 | 349 | } |
5832d1f2 | 350 | qemu_free(d.dirty_bitmap); |
151f7749 JK |
351 | |
352 | return ret; | |
5832d1f2 AL |
353 | } |
354 | ||
c227f099 | 355 | int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) |
f65ed4c1 AL |
356 | { |
357 | int ret = -ENOSYS; | |
358 | #ifdef KVM_CAP_COALESCED_MMIO | |
359 | KVMState *s = kvm_state; | |
360 | ||
361 | if (s->coalesced_mmio) { | |
362 | struct kvm_coalesced_mmio_zone zone; | |
363 | ||
364 | zone.addr = start; | |
365 | zone.size = size; | |
366 | ||
367 | ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); | |
368 | } | |
369 | #endif | |
370 | ||
371 | return ret; | |
372 | } | |
373 | ||
c227f099 | 374 | int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) |
f65ed4c1 AL |
375 | { |
376 | int ret = -ENOSYS; | |
377 | #ifdef KVM_CAP_COALESCED_MMIO | |
378 | KVMState *s = kvm_state; | |
379 | ||
380 | if (s->coalesced_mmio) { | |
381 | struct kvm_coalesced_mmio_zone zone; | |
382 | ||
383 | zone.addr = start; | |
384 | zone.size = size; | |
385 | ||
386 | ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); | |
387 | } | |
388 | #endif | |
389 | ||
390 | return ret; | |
391 | } | |
392 | ||
ad7b8b33 AL |
393 | int kvm_check_extension(KVMState *s, unsigned int extension) |
394 | { | |
395 | int ret; | |
396 | ||
397 | ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension); | |
398 | if (ret < 0) { | |
399 | ret = 0; | |
400 | } | |
401 | ||
402 | return ret; | |
403 | } | |
404 | ||
46dbef6a MT |
405 | void kvm_set_phys_mem(target_phys_addr_t start_addr, |
406 | ram_addr_t size, | |
407 | ram_addr_t phys_offset) | |
408 | { | |
409 | KVMState *s = kvm_state; | |
410 | ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; | |
411 | KVMSlot *mem, old; | |
412 | int err; | |
413 | ||
414 | if (start_addr & ~TARGET_PAGE_MASK) { | |
415 | if (flags >= IO_MEM_UNASSIGNED) { | |
416 | if (!kvm_lookup_overlapping_slot(s, start_addr, | |
417 | start_addr + size)) { | |
418 | return; | |
419 | } | |
420 | fprintf(stderr, "Unaligned split of a KVM memory slot\n"); | |
421 | } else { | |
422 | fprintf(stderr, "Only page-aligned memory slots supported\n"); | |
423 | } | |
424 | abort(); | |
425 | } | |
426 | ||
427 | /* KVM does not support read-only slots */ | |
428 | phys_offset &= ~IO_MEM_ROM; | |
429 | ||
430 | while (1) { | |
431 | mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size); | |
432 | if (!mem) { | |
433 | break; | |
434 | } | |
435 | ||
436 | if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr && | |
437 | (start_addr + size <= mem->start_addr + mem->memory_size) && | |
438 | (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) { | |
439 | /* The new slot fits into the existing one and comes with | |
440 | * identical parameters - nothing to be done. */ | |
441 | return; | |
442 | } | |
443 | ||
444 | old = *mem; | |
445 | ||
446 | /* unregister the overlapping slot */ | |
447 | mem->memory_size = 0; | |
448 | err = kvm_set_user_memory_region(s, mem); | |
449 | if (err) { | |
450 | fprintf(stderr, "%s: error unregistering overlapping slot: %s\n", | |
451 | __func__, strerror(-err)); | |
452 | abort(); | |
453 | } | |
454 | ||
455 | /* Workaround for older KVM versions: we can't join slots, even not by | |
456 | * unregistering the previous ones and then registering the larger | |
457 | * slot. We have to maintain the existing fragmentation. Sigh. | |
458 | * | |
459 | * This workaround assumes that the new slot starts at the same | |
460 | * address as the first existing one. If not or if some overlapping | |
461 | * slot comes around later, we will fail (not seen in practice so far) | |
462 | * - and actually require a recent KVM version. */ | |
463 | if (s->broken_set_mem_region && | |
464 | old.start_addr == start_addr && old.memory_size < size && | |
465 | flags < IO_MEM_UNASSIGNED) { | |
466 | mem = kvm_alloc_slot(s); | |
467 | mem->memory_size = old.memory_size; | |
468 | mem->start_addr = old.start_addr; | |
469 | mem->phys_offset = old.phys_offset; | |
470 | mem->flags = 0; | |
471 | ||
472 | err = kvm_set_user_memory_region(s, mem); | |
473 | if (err) { | |
474 | fprintf(stderr, "%s: error updating slot: %s\n", __func__, | |
475 | strerror(-err)); | |
476 | abort(); | |
477 | } | |
478 | ||
479 | start_addr += old.memory_size; | |
480 | phys_offset += old.memory_size; | |
481 | size -= old.memory_size; | |
482 | continue; | |
483 | } | |
484 | ||
485 | /* register prefix slot */ | |
486 | if (old.start_addr < start_addr) { | |
487 | mem = kvm_alloc_slot(s); | |
488 | mem->memory_size = start_addr - old.start_addr; | |
489 | mem->start_addr = old.start_addr; | |
490 | mem->phys_offset = old.phys_offset; | |
491 | mem->flags = 0; | |
492 | ||
493 | err = kvm_set_user_memory_region(s, mem); | |
494 | if (err) { | |
495 | fprintf(stderr, "%s: error registering prefix slot: %s\n", | |
496 | __func__, strerror(-err)); | |
497 | abort(); | |
498 | } | |
499 | } | |
500 | ||
501 | /* register suffix slot */ | |
502 | if (old.start_addr + old.memory_size > start_addr + size) { | |
503 | ram_addr_t size_delta; | |
504 | ||
505 | mem = kvm_alloc_slot(s); | |
506 | mem->start_addr = start_addr + size; | |
507 | size_delta = mem->start_addr - old.start_addr; | |
508 | mem->memory_size = old.memory_size - size_delta; | |
509 | mem->phys_offset = old.phys_offset + size_delta; | |
510 | mem->flags = 0; | |
511 | ||
512 | err = kvm_set_user_memory_region(s, mem); | |
513 | if (err) { | |
514 | fprintf(stderr, "%s: error registering suffix slot: %s\n", | |
515 | __func__, strerror(-err)); | |
516 | abort(); | |
517 | } | |
518 | } | |
519 | } | |
520 | ||
521 | /* in case the KVM bug workaround already "consumed" the new slot */ | |
522 | if (!size) | |
523 | return; | |
524 | ||
525 | /* KVM does not need to know about this memory */ | |
526 | if (flags >= IO_MEM_UNASSIGNED) | |
527 | return; | |
528 | ||
529 | mem = kvm_alloc_slot(s); | |
530 | mem->memory_size = size; | |
531 | mem->start_addr = start_addr; | |
532 | mem->phys_offset = phys_offset; | |
533 | mem->flags = 0; | |
534 | ||
535 | err = kvm_set_user_memory_region(s, mem); | |
536 | if (err) { | |
537 | fprintf(stderr, "%s: error registering slot: %s\n", __func__, | |
538 | strerror(-err)); | |
539 | abort(); | |
540 | } | |
541 | } | |
542 | ||
05330448 AL |
543 | int kvm_init(int smp_cpus) |
544 | { | |
168ccc11 JK |
545 | static const char upgrade_note[] = |
546 | "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n" | |
547 | "(see http://sourceforge.net/projects/kvm).\n"; | |
05330448 AL |
548 | KVMState *s; |
549 | int ret; | |
550 | int i; | |
551 | ||
9f8fd694 MM |
552 | if (smp_cpus > 1) { |
553 | fprintf(stderr, "No SMP KVM support, use '-smp 1'\n"); | |
05330448 | 554 | return -EINVAL; |
9f8fd694 | 555 | } |
05330448 AL |
556 | |
557 | s = qemu_mallocz(sizeof(KVMState)); | |
05330448 | 558 | |
e22a25c9 | 559 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
72cf2d4f | 560 | QTAILQ_INIT(&s->kvm_sw_breakpoints); |
e22a25c9 | 561 | #endif |
05330448 AL |
562 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
563 | s->slots[i].slot = i; | |
564 | ||
565 | s->vmfd = -1; | |
40ff6d7e | 566 | s->fd = qemu_open("/dev/kvm", O_RDWR); |
05330448 AL |
567 | if (s->fd == -1) { |
568 | fprintf(stderr, "Could not access KVM kernel module: %m\n"); | |
569 | ret = -errno; | |
570 | goto err; | |
571 | } | |
572 | ||
573 | ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0); | |
574 | if (ret < KVM_API_VERSION) { | |
575 | if (ret > 0) | |
576 | ret = -EINVAL; | |
577 | fprintf(stderr, "kvm version too old\n"); | |
578 | goto err; | |
579 | } | |
580 | ||
581 | if (ret > KVM_API_VERSION) { | |
582 | ret = -EINVAL; | |
583 | fprintf(stderr, "kvm version not supported\n"); | |
584 | goto err; | |
585 | } | |
586 | ||
587 | s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0); | |
588 | if (s->vmfd < 0) | |
589 | goto err; | |
590 | ||
591 | /* initially, KVM allocated its own memory and we had to jump through | |
592 | * hooks to make phys_ram_base point to this. Modern versions of KVM | |
5579c7f3 | 593 | * just use a user allocated buffer so we can use regular pages |
05330448 AL |
594 | * unmodified. Make sure we have a sufficiently modern version of KVM. |
595 | */ | |
ad7b8b33 AL |
596 | if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) { |
597 | ret = -EINVAL; | |
168ccc11 JK |
598 | fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s", |
599 | upgrade_note); | |
05330448 AL |
600 | goto err; |
601 | } | |
602 | ||
d85dc283 AL |
603 | /* There was a nasty bug in < kvm-80 that prevents memory slots from being |
604 | * destroyed properly. Since we rely on this capability, refuse to work | |
605 | * with any kernel without this capability. */ | |
ad7b8b33 AL |
606 | if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) { |
607 | ret = -EINVAL; | |
d85dc283 AL |
608 | |
609 | fprintf(stderr, | |
168ccc11 JK |
610 | "KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s", |
611 | upgrade_note); | |
d85dc283 AL |
612 | goto err; |
613 | } | |
614 | ||
62a2744c | 615 | s->coalesced_mmio = 0; |
f65ed4c1 | 616 | #ifdef KVM_CAP_COALESCED_MMIO |
ad7b8b33 | 617 | s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); |
62a2744c | 618 | s->coalesced_mmio_ring = NULL; |
f65ed4c1 AL |
619 | #endif |
620 | ||
e69917e2 JK |
621 | s->broken_set_mem_region = 1; |
622 | #ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS | |
623 | ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS); | |
624 | if (ret > 0) { | |
625 | s->broken_set_mem_region = 0; | |
626 | } | |
627 | #endif | |
628 | ||
a0fb002c JK |
629 | s->vcpu_events = 0; |
630 | #ifdef KVM_CAP_VCPU_EVENTS | |
631 | s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS); | |
632 | #endif | |
633 | ||
05330448 AL |
634 | ret = kvm_arch_init(s, smp_cpus); |
635 | if (ret < 0) | |
636 | goto err; | |
637 | ||
638 | kvm_state = s; | |
639 | ||
640 | return 0; | |
641 | ||
642 | err: | |
643 | if (s) { | |
644 | if (s->vmfd != -1) | |
645 | close(s->vmfd); | |
646 | if (s->fd != -1) | |
647 | close(s->fd); | |
648 | } | |
649 | qemu_free(s); | |
650 | ||
651 | return ret; | |
652 | } | |
653 | ||
afcea8cb BS |
654 | static int kvm_handle_io(uint16_t port, void *data, int direction, int size, |
655 | uint32_t count) | |
05330448 AL |
656 | { |
657 | int i; | |
658 | uint8_t *ptr = data; | |
659 | ||
660 | for (i = 0; i < count; i++) { | |
661 | if (direction == KVM_EXIT_IO_IN) { | |
662 | switch (size) { | |
663 | case 1: | |
afcea8cb | 664 | stb_p(ptr, cpu_inb(port)); |
05330448 AL |
665 | break; |
666 | case 2: | |
afcea8cb | 667 | stw_p(ptr, cpu_inw(port)); |
05330448 AL |
668 | break; |
669 | case 4: | |
afcea8cb | 670 | stl_p(ptr, cpu_inl(port)); |
05330448 AL |
671 | break; |
672 | } | |
673 | } else { | |
674 | switch (size) { | |
675 | case 1: | |
afcea8cb | 676 | cpu_outb(port, ldub_p(ptr)); |
05330448 AL |
677 | break; |
678 | case 2: | |
afcea8cb | 679 | cpu_outw(port, lduw_p(ptr)); |
05330448 AL |
680 | break; |
681 | case 4: | |
afcea8cb | 682 | cpu_outl(port, ldl_p(ptr)); |
05330448 AL |
683 | break; |
684 | } | |
685 | } | |
686 | ||
687 | ptr += size; | |
688 | } | |
689 | ||
690 | return 1; | |
691 | } | |
692 | ||
62a2744c | 693 | void kvm_flush_coalesced_mmio_buffer(void) |
f65ed4c1 AL |
694 | { |
695 | #ifdef KVM_CAP_COALESCED_MMIO | |
696 | KVMState *s = kvm_state; | |
62a2744c SY |
697 | if (s->coalesced_mmio_ring) { |
698 | struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring; | |
f65ed4c1 AL |
699 | while (ring->first != ring->last) { |
700 | struct kvm_coalesced_mmio *ent; | |
701 | ||
702 | ent = &ring->coalesced_mmio[ring->first]; | |
703 | ||
704 | cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); | |
705 | /* FIXME smp_wmb() */ | |
706 | ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX; | |
707 | } | |
708 | } | |
709 | #endif | |
710 | } | |
711 | ||
4c0960c0 AK |
712 | void kvm_cpu_synchronize_state(CPUState *env) |
713 | { | |
9ded2744 | 714 | if (!env->kvm_vcpu_dirty) { |
4c0960c0 | 715 | kvm_arch_get_registers(env); |
9ded2744 | 716 | env->kvm_vcpu_dirty = 1; |
4c0960c0 AK |
717 | } |
718 | } | |
719 | ||
05330448 AL |
720 | int kvm_cpu_exec(CPUState *env) |
721 | { | |
722 | struct kvm_run *run = env->kvm_run; | |
723 | int ret; | |
724 | ||
725 | dprintf("kvm_cpu_exec()\n"); | |
726 | ||
727 | do { | |
be214e6c | 728 | if (env->exit_request) { |
05330448 AL |
729 | dprintf("interrupt exit requested\n"); |
730 | ret = 0; | |
731 | break; | |
732 | } | |
733 | ||
9ded2744 | 734 | if (env->kvm_vcpu_dirty) { |
4c0960c0 | 735 | kvm_arch_put_registers(env); |
9ded2744 | 736 | env->kvm_vcpu_dirty = 0; |
4c0960c0 AK |
737 | } |
738 | ||
8c14c173 | 739 | kvm_arch_pre_run(env, run); |
d549db5a | 740 | qemu_mutex_unlock_iothread(); |
05330448 | 741 | ret = kvm_vcpu_ioctl(env, KVM_RUN, 0); |
d549db5a | 742 | qemu_mutex_lock_iothread(); |
05330448 AL |
743 | kvm_arch_post_run(env, run); |
744 | ||
745 | if (ret == -EINTR || ret == -EAGAIN) { | |
746 | dprintf("io window exit\n"); | |
747 | ret = 0; | |
748 | break; | |
749 | } | |
750 | ||
751 | if (ret < 0) { | |
752 | dprintf("kvm run failed %s\n", strerror(-ret)); | |
753 | abort(); | |
754 | } | |
755 | ||
62a2744c | 756 | kvm_flush_coalesced_mmio_buffer(); |
f65ed4c1 | 757 | |
05330448 AL |
758 | ret = 0; /* exit loop */ |
759 | switch (run->exit_reason) { | |
760 | case KVM_EXIT_IO: | |
761 | dprintf("handle_io\n"); | |
afcea8cb | 762 | ret = kvm_handle_io(run->io.port, |
05330448 AL |
763 | (uint8_t *)run + run->io.data_offset, |
764 | run->io.direction, | |
765 | run->io.size, | |
766 | run->io.count); | |
767 | break; | |
768 | case KVM_EXIT_MMIO: | |
769 | dprintf("handle_mmio\n"); | |
770 | cpu_physical_memory_rw(run->mmio.phys_addr, | |
771 | run->mmio.data, | |
772 | run->mmio.len, | |
773 | run->mmio.is_write); | |
774 | ret = 1; | |
775 | break; | |
776 | case KVM_EXIT_IRQ_WINDOW_OPEN: | |
777 | dprintf("irq_window_open\n"); | |
778 | break; | |
779 | case KVM_EXIT_SHUTDOWN: | |
780 | dprintf("shutdown\n"); | |
781 | qemu_system_reset_request(); | |
782 | ret = 1; | |
783 | break; | |
784 | case KVM_EXIT_UNKNOWN: | |
785 | dprintf("kvm_exit_unknown\n"); | |
786 | break; | |
787 | case KVM_EXIT_FAIL_ENTRY: | |
788 | dprintf("kvm_exit_fail_entry\n"); | |
789 | break; | |
790 | case KVM_EXIT_EXCEPTION: | |
791 | dprintf("kvm_exit_exception\n"); | |
792 | break; | |
793 | case KVM_EXIT_DEBUG: | |
794 | dprintf("kvm_exit_debug\n"); | |
e22a25c9 AL |
795 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
796 | if (kvm_arch_debug(&run->debug.arch)) { | |
797 | gdb_set_stop_cpu(env); | |
798 | vm_stop(EXCP_DEBUG); | |
799 | env->exception_index = EXCP_DEBUG; | |
800 | return 0; | |
801 | } | |
802 | /* re-enter, this exception was guest-internal */ | |
803 | ret = 1; | |
804 | #endif /* KVM_CAP_SET_GUEST_DEBUG */ | |
05330448 AL |
805 | break; |
806 | default: | |
807 | dprintf("kvm_arch_handle_exit\n"); | |
808 | ret = kvm_arch_handle_exit(env, run); | |
809 | break; | |
810 | } | |
811 | } while (ret > 0); | |
812 | ||
be214e6c AJ |
813 | if (env->exit_request) { |
814 | env->exit_request = 0; | |
becfc390 AL |
815 | env->exception_index = EXCP_INTERRUPT; |
816 | } | |
817 | ||
05330448 AL |
818 | return ret; |
819 | } | |
820 | ||
984b5181 | 821 | int kvm_ioctl(KVMState *s, int type, ...) |
05330448 AL |
822 | { |
823 | int ret; | |
984b5181 AL |
824 | void *arg; |
825 | va_list ap; | |
05330448 | 826 | |
984b5181 AL |
827 | va_start(ap, type); |
828 | arg = va_arg(ap, void *); | |
829 | va_end(ap); | |
830 | ||
831 | ret = ioctl(s->fd, type, arg); | |
05330448 AL |
832 | if (ret == -1) |
833 | ret = -errno; | |
834 | ||
835 | return ret; | |
836 | } | |
837 | ||
984b5181 | 838 | int kvm_vm_ioctl(KVMState *s, int type, ...) |
05330448 AL |
839 | { |
840 | int ret; | |
984b5181 AL |
841 | void *arg; |
842 | va_list ap; | |
843 | ||
844 | va_start(ap, type); | |
845 | arg = va_arg(ap, void *); | |
846 | va_end(ap); | |
05330448 | 847 | |
984b5181 | 848 | ret = ioctl(s->vmfd, type, arg); |
05330448 AL |
849 | if (ret == -1) |
850 | ret = -errno; | |
851 | ||
852 | return ret; | |
853 | } | |
854 | ||
984b5181 | 855 | int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
05330448 AL |
856 | { |
857 | int ret; | |
984b5181 AL |
858 | void *arg; |
859 | va_list ap; | |
860 | ||
861 | va_start(ap, type); | |
862 | arg = va_arg(ap, void *); | |
863 | va_end(ap); | |
05330448 | 864 | |
984b5181 | 865 | ret = ioctl(env->kvm_fd, type, arg); |
05330448 AL |
866 | if (ret == -1) |
867 | ret = -errno; | |
868 | ||
869 | return ret; | |
870 | } | |
bd322087 AL |
871 | |
872 | int kvm_has_sync_mmu(void) | |
873 | { | |
a9c11522 | 874 | #ifdef KVM_CAP_SYNC_MMU |
bd322087 AL |
875 | KVMState *s = kvm_state; |
876 | ||
ad7b8b33 AL |
877 | return kvm_check_extension(s, KVM_CAP_SYNC_MMU); |
878 | #else | |
bd322087 | 879 | return 0; |
ad7b8b33 | 880 | #endif |
bd322087 | 881 | } |
e22a25c9 | 882 | |
a0fb002c JK |
883 | int kvm_has_vcpu_events(void) |
884 | { | |
885 | return kvm_state->vcpu_events; | |
886 | } | |
887 | ||
6f0437e8 JK |
888 | void kvm_setup_guest_memory(void *start, size_t size) |
889 | { | |
890 | if (!kvm_has_sync_mmu()) { | |
891 | #ifdef MADV_DONTFORK | |
892 | int ret = madvise(start, size, MADV_DONTFORK); | |
893 | ||
894 | if (ret) { | |
895 | perror("madvice"); | |
896 | exit(1); | |
897 | } | |
898 | #else | |
899 | fprintf(stderr, | |
900 | "Need MADV_DONTFORK in absence of synchronous KVM MMU\n"); | |
901 | exit(1); | |
902 | #endif | |
903 | } | |
904 | } | |
905 | ||
e22a25c9 | 906 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
fc5d642f LC |
907 | static void on_vcpu(CPUState *env, void (*func)(void *data), void *data) |
908 | { | |
828566bc | 909 | #ifdef CONFIG_IOTHREAD |
fc5d642f LC |
910 | if (env == cpu_single_env) { |
911 | func(data); | |
912 | return; | |
913 | } | |
914 | abort(); | |
828566bc GC |
915 | #else |
916 | func(data); | |
917 | #endif | |
fc5d642f LC |
918 | } |
919 | ||
e22a25c9 AL |
920 | struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env, |
921 | target_ulong pc) | |
922 | { | |
923 | struct kvm_sw_breakpoint *bp; | |
924 | ||
72cf2d4f | 925 | QTAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) { |
e22a25c9 AL |
926 | if (bp->pc == pc) |
927 | return bp; | |
928 | } | |
929 | return NULL; | |
930 | } | |
931 | ||
932 | int kvm_sw_breakpoints_active(CPUState *env) | |
933 | { | |
72cf2d4f | 934 | return !QTAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints); |
e22a25c9 AL |
935 | } |
936 | ||
452e4751 GC |
937 | struct kvm_set_guest_debug_data { |
938 | struct kvm_guest_debug dbg; | |
939 | CPUState *env; | |
940 | int err; | |
941 | }; | |
942 | ||
943 | static void kvm_invoke_set_guest_debug(void *data) | |
944 | { | |
945 | struct kvm_set_guest_debug_data *dbg_data = data; | |
b3807725 JK |
946 | CPUState *env = dbg_data->env; |
947 | ||
9ded2744 | 948 | if (env->kvm_vcpu_dirty) { |
b3807725 | 949 | kvm_arch_put_registers(env); |
9ded2744 | 950 | env->kvm_vcpu_dirty = 0; |
b3807725 JK |
951 | } |
952 | dbg_data->err = kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg_data->dbg); | |
452e4751 GC |
953 | } |
954 | ||
e22a25c9 AL |
955 | int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
956 | { | |
452e4751 | 957 | struct kvm_set_guest_debug_data data; |
e22a25c9 | 958 | |
452e4751 | 959 | data.dbg.control = 0; |
e22a25c9 | 960 | if (env->singlestep_enabled) |
452e4751 | 961 | data.dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; |
e22a25c9 | 962 | |
452e4751 GC |
963 | kvm_arch_update_guest_debug(env, &data.dbg); |
964 | data.dbg.control |= reinject_trap; | |
965 | data.env = env; | |
e22a25c9 | 966 | |
452e4751 GC |
967 | on_vcpu(env, kvm_invoke_set_guest_debug, &data); |
968 | return data.err; | |
e22a25c9 AL |
969 | } |
970 | ||
971 | int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, | |
972 | target_ulong len, int type) | |
973 | { | |
974 | struct kvm_sw_breakpoint *bp; | |
975 | CPUState *env; | |
976 | int err; | |
977 | ||
978 | if (type == GDB_BREAKPOINT_SW) { | |
979 | bp = kvm_find_sw_breakpoint(current_env, addr); | |
980 | if (bp) { | |
981 | bp->use_count++; | |
982 | return 0; | |
983 | } | |
984 | ||
985 | bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint)); | |
986 | if (!bp) | |
987 | return -ENOMEM; | |
988 | ||
989 | bp->pc = addr; | |
990 | bp->use_count = 1; | |
991 | err = kvm_arch_insert_sw_breakpoint(current_env, bp); | |
992 | if (err) { | |
993 | free(bp); | |
994 | return err; | |
995 | } | |
996 | ||
72cf2d4f | 997 | QTAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints, |
e22a25c9 AL |
998 | bp, entry); |
999 | } else { | |
1000 | err = kvm_arch_insert_hw_breakpoint(addr, len, type); | |
1001 | if (err) | |
1002 | return err; | |
1003 | } | |
1004 | ||
1005 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
1006 | err = kvm_update_guest_debug(env, 0); | |
1007 | if (err) | |
1008 | return err; | |
1009 | } | |
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, | |
1014 | target_ulong len, int type) | |
1015 | { | |
1016 | struct kvm_sw_breakpoint *bp; | |
1017 | CPUState *env; | |
1018 | int err; | |
1019 | ||
1020 | if (type == GDB_BREAKPOINT_SW) { | |
1021 | bp = kvm_find_sw_breakpoint(current_env, addr); | |
1022 | if (!bp) | |
1023 | return -ENOENT; | |
1024 | ||
1025 | if (bp->use_count > 1) { | |
1026 | bp->use_count--; | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | err = kvm_arch_remove_sw_breakpoint(current_env, bp); | |
1031 | if (err) | |
1032 | return err; | |
1033 | ||
72cf2d4f | 1034 | QTAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry); |
e22a25c9 AL |
1035 | qemu_free(bp); |
1036 | } else { | |
1037 | err = kvm_arch_remove_hw_breakpoint(addr, len, type); | |
1038 | if (err) | |
1039 | return err; | |
1040 | } | |
1041 | ||
1042 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
1043 | err = kvm_update_guest_debug(env, 0); | |
1044 | if (err) | |
1045 | return err; | |
1046 | } | |
1047 | return 0; | |
1048 | } | |
1049 | ||
1050 | void kvm_remove_all_breakpoints(CPUState *current_env) | |
1051 | { | |
1052 | struct kvm_sw_breakpoint *bp, *next; | |
1053 | KVMState *s = current_env->kvm_state; | |
1054 | CPUState *env; | |
1055 | ||
72cf2d4f | 1056 | QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { |
e22a25c9 AL |
1057 | if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) { |
1058 | /* Try harder to find a CPU that currently sees the breakpoint. */ | |
1059 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
1060 | if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) | |
1061 | break; | |
1062 | } | |
1063 | } | |
1064 | } | |
1065 | kvm_arch_remove_all_hw_breakpoints(); | |
1066 | ||
1067 | for (env = first_cpu; env != NULL; env = env->next_cpu) | |
1068 | kvm_update_guest_debug(env, 0); | |
1069 | } | |
1070 | ||
1071 | #else /* !KVM_CAP_SET_GUEST_DEBUG */ | |
1072 | ||
1073 | int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) | |
1074 | { | |
1075 | return -EINVAL; | |
1076 | } | |
1077 | ||
1078 | int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, | |
1079 | target_ulong len, int type) | |
1080 | { | |
1081 | return -EINVAL; | |
1082 | } | |
1083 | ||
1084 | int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, | |
1085 | target_ulong len, int type) | |
1086 | { | |
1087 | return -EINVAL; | |
1088 | } | |
1089 | ||
1090 | void kvm_remove_all_breakpoints(CPUState *current_env) | |
1091 | { | |
1092 | } | |
1093 | #endif /* !KVM_CAP_SET_GUEST_DEBUG */ |