]>
Commit | Line | Data |
---|---|---|
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 | { | |
44 | target_phys_addr_t start_addr; | |
45 | ram_addr_t memory_size; | |
46 | ram_addr_t phys_offset; | |
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; |
e69917e2 | 61 | int broken_set_mem_region; |
4495d6a7 | 62 | int migration_log; |
e22a25c9 AL |
63 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
64 | struct kvm_sw_breakpoint_head kvm_sw_breakpoints; | |
65 | #endif | |
05330448 AL |
66 | }; |
67 | ||
68 | static KVMState *kvm_state; | |
69 | ||
70 | static KVMSlot *kvm_alloc_slot(KVMState *s) | |
71 | { | |
72 | int i; | |
73 | ||
74 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
62d60e8c AL |
75 | /* KVM private memory slots */ |
76 | if (i >= 8 && i < 12) | |
77 | continue; | |
05330448 AL |
78 | if (s->slots[i].memory_size == 0) |
79 | return &s->slots[i]; | |
80 | } | |
81 | ||
d3f8d37f AL |
82 | fprintf(stderr, "%s: no free slot available\n", __func__); |
83 | abort(); | |
84 | } | |
85 | ||
86 | static KVMSlot *kvm_lookup_matching_slot(KVMState *s, | |
87 | target_phys_addr_t start_addr, | |
88 | target_phys_addr_t end_addr) | |
89 | { | |
90 | int i; | |
91 | ||
92 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
93 | KVMSlot *mem = &s->slots[i]; | |
94 | ||
95 | if (start_addr == mem->start_addr && | |
96 | end_addr == mem->start_addr + mem->memory_size) { | |
97 | return mem; | |
98 | } | |
99 | } | |
100 | ||
05330448 AL |
101 | return NULL; |
102 | } | |
103 | ||
6152e2ae AL |
104 | /* |
105 | * Find overlapping slot with lowest start address | |
106 | */ | |
107 | static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s, | |
108 | target_phys_addr_t start_addr, | |
109 | target_phys_addr_t end_addr) | |
05330448 | 110 | { |
6152e2ae | 111 | KVMSlot *found = NULL; |
05330448 AL |
112 | int i; |
113 | ||
114 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
115 | KVMSlot *mem = &s->slots[i]; | |
116 | ||
6152e2ae AL |
117 | if (mem->memory_size == 0 || |
118 | (found && found->start_addr < mem->start_addr)) { | |
119 | continue; | |
120 | } | |
121 | ||
122 | if (end_addr > mem->start_addr && | |
123 | start_addr < mem->start_addr + mem->memory_size) { | |
124 | found = mem; | |
125 | } | |
05330448 AL |
126 | } |
127 | ||
6152e2ae | 128 | return found; |
05330448 AL |
129 | } |
130 | ||
5832d1f2 AL |
131 | static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot) |
132 | { | |
133 | struct kvm_userspace_memory_region mem; | |
134 | ||
135 | mem.slot = slot->slot; | |
136 | mem.guest_phys_addr = slot->start_addr; | |
137 | mem.memory_size = slot->memory_size; | |
5579c7f3 | 138 | mem.userspace_addr = (unsigned long)qemu_get_ram_ptr(slot->phys_offset); |
5832d1f2 | 139 | mem.flags = slot->flags; |
4495d6a7 JK |
140 | if (s->migration_log) { |
141 | mem.flags |= KVM_MEM_LOG_DIRTY_PAGES; | |
142 | } | |
5832d1f2 AL |
143 | return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem); |
144 | } | |
145 | ||
8d2ba1fb JK |
146 | static void kvm_reset_vcpu(void *opaque) |
147 | { | |
148 | CPUState *env = opaque; | |
149 | ||
150 | if (kvm_arch_put_registers(env)) { | |
151 | fprintf(stderr, "Fatal: kvm vcpu reset failed\n"); | |
152 | abort(); | |
153 | } | |
154 | } | |
5832d1f2 | 155 | |
452e4751 GC |
156 | static void on_vcpu(CPUState *env, void (*func)(void *data), void *data) |
157 | { | |
158 | if (env == cpu_single_env) { | |
159 | func(data); | |
160 | return; | |
161 | } | |
162 | abort(); | |
163 | } | |
164 | ||
05330448 AL |
165 | int kvm_init_vcpu(CPUState *env) |
166 | { | |
167 | KVMState *s = kvm_state; | |
168 | long mmap_size; | |
169 | int ret; | |
170 | ||
171 | dprintf("kvm_init_vcpu\n"); | |
172 | ||
984b5181 | 173 | ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index); |
05330448 AL |
174 | if (ret < 0) { |
175 | dprintf("kvm_create_vcpu failed\n"); | |
176 | goto err; | |
177 | } | |
178 | ||
179 | env->kvm_fd = ret; | |
180 | env->kvm_state = s; | |
181 | ||
182 | mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0); | |
183 | if (mmap_size < 0) { | |
184 | dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n"); | |
185 | goto err; | |
186 | } | |
187 | ||
188 | env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, | |
189 | env->kvm_fd, 0); | |
190 | if (env->kvm_run == MAP_FAILED) { | |
191 | ret = -errno; | |
192 | dprintf("mmap'ing vcpu state failed\n"); | |
193 | goto err; | |
194 | } | |
195 | ||
196 | ret = kvm_arch_init_vcpu(env); | |
8d2ba1fb | 197 | if (ret == 0) { |
a08d4367 | 198 | qemu_register_reset(kvm_reset_vcpu, env); |
8d2ba1fb JK |
199 | ret = kvm_arch_put_registers(env); |
200 | } | |
05330448 AL |
201 | err: |
202 | return ret; | |
203 | } | |
204 | ||
f8d926e9 JK |
205 | int kvm_put_mp_state(CPUState *env) |
206 | { | |
207 | struct kvm_mp_state mp_state = { .mp_state = env->mp_state }; | |
208 | ||
209 | return kvm_vcpu_ioctl(env, KVM_SET_MP_STATE, &mp_state); | |
210 | } | |
211 | ||
212 | int kvm_get_mp_state(CPUState *env) | |
213 | { | |
214 | struct kvm_mp_state mp_state; | |
215 | int ret; | |
216 | ||
217 | ret = kvm_vcpu_ioctl(env, KVM_GET_MP_STATE, &mp_state); | |
218 | if (ret < 0) { | |
219 | return ret; | |
220 | } | |
221 | env->mp_state = mp_state.mp_state; | |
222 | return 0; | |
223 | } | |
224 | ||
5832d1f2 AL |
225 | /* |
226 | * dirty pages logging control | |
227 | */ | |
d3f8d37f | 228 | static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr, |
4495d6a7 | 229 | ram_addr_t size, int flags, int mask) |
5832d1f2 AL |
230 | { |
231 | KVMState *s = kvm_state; | |
d3f8d37f | 232 | KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size); |
4495d6a7 JK |
233 | int old_flags; |
234 | ||
5832d1f2 | 235 | if (mem == NULL) { |
d3f8d37f AL |
236 | fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-" |
237 | TARGET_FMT_plx "\n", __func__, phys_addr, | |
b80a55e6 | 238 | (target_phys_addr_t)(phys_addr + size - 1)); |
5832d1f2 AL |
239 | return -EINVAL; |
240 | } | |
241 | ||
4495d6a7 | 242 | old_flags = mem->flags; |
5832d1f2 | 243 | |
4495d6a7 | 244 | flags = (mem->flags & ~mask) | flags; |
5832d1f2 AL |
245 | mem->flags = flags; |
246 | ||
4495d6a7 JK |
247 | /* If nothing changed effectively, no need to issue ioctl */ |
248 | if (s->migration_log) { | |
249 | flags |= KVM_MEM_LOG_DIRTY_PAGES; | |
250 | } | |
251 | if (flags == old_flags) { | |
252 | return 0; | |
253 | } | |
254 | ||
5832d1f2 AL |
255 | return kvm_set_user_memory_region(s, mem); |
256 | } | |
257 | ||
d3f8d37f | 258 | int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size) |
5832d1f2 | 259 | { |
d3f8d37f | 260 | return kvm_dirty_pages_log_change(phys_addr, size, |
5832d1f2 AL |
261 | KVM_MEM_LOG_DIRTY_PAGES, |
262 | KVM_MEM_LOG_DIRTY_PAGES); | |
263 | } | |
264 | ||
d3f8d37f | 265 | int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size) |
5832d1f2 | 266 | { |
d3f8d37f | 267 | return kvm_dirty_pages_log_change(phys_addr, size, |
5832d1f2 AL |
268 | 0, |
269 | KVM_MEM_LOG_DIRTY_PAGES); | |
270 | } | |
271 | ||
4495d6a7 JK |
272 | int kvm_set_migration_log(int enable) |
273 | { | |
274 | KVMState *s = kvm_state; | |
275 | KVMSlot *mem; | |
276 | int i, err; | |
277 | ||
278 | s->migration_log = enable; | |
279 | ||
280 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
281 | mem = &s->slots[i]; | |
282 | ||
283 | if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) { | |
284 | continue; | |
285 | } | |
286 | err = kvm_set_user_memory_region(s, mem); | |
287 | if (err) { | |
288 | return err; | |
289 | } | |
290 | } | |
291 | return 0; | |
292 | } | |
293 | ||
5832d1f2 AL |
294 | /** |
295 | * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space | |
296 | * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty(). | |
297 | * This means all bits are set to dirty. | |
298 | * | |
d3f8d37f | 299 | * @start_add: start of logged region. |
5832d1f2 AL |
300 | * @end_addr: end of logged region. |
301 | */ | |
151f7749 JK |
302 | int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, |
303 | target_phys_addr_t end_addr) | |
5832d1f2 AL |
304 | { |
305 | KVMState *s = kvm_state; | |
151f7749 JK |
306 | unsigned long size, allocated_size = 0; |
307 | target_phys_addr_t phys_addr; | |
5832d1f2 | 308 | ram_addr_t addr; |
151f7749 JK |
309 | KVMDirtyLog d; |
310 | KVMSlot *mem; | |
311 | int ret = 0; | |
bd836776 | 312 | int r; |
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 | |
bd836776 AG |
321 | /* We didn't activate dirty logging? Don't care then. */ |
322 | if(!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES)) { | |
323 | continue; | |
324 | } | |
325 | ||
151f7749 JK |
326 | size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8; |
327 | if (!d.dirty_bitmap) { | |
328 | d.dirty_bitmap = qemu_malloc(size); | |
329 | } else if (size > allocated_size) { | |
330 | d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size); | |
331 | } | |
332 | allocated_size = size; | |
333 | memset(d.dirty_bitmap, 0, allocated_size); | |
5832d1f2 | 334 | |
151f7749 | 335 | d.slot = mem->slot; |
5832d1f2 | 336 | |
bd836776 AG |
337 | r = kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d); |
338 | if (r == -EINVAL) { | |
151f7749 JK |
339 | dprintf("ioctl failed %d\n", errno); |
340 | ret = -1; | |
341 | break; | |
342 | } | |
5832d1f2 | 343 | |
151f7749 JK |
344 | for (phys_addr = mem->start_addr, addr = mem->phys_offset; |
345 | phys_addr < mem->start_addr + mem->memory_size; | |
346 | phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) { | |
347 | unsigned long *bitmap = (unsigned long *)d.dirty_bitmap; | |
348 | unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS; | |
349 | unsigned word = nr / (sizeof(*bitmap) * 8); | |
350 | unsigned bit = nr % (sizeof(*bitmap) * 8); | |
351 | ||
352 | if ((bitmap[word] >> bit) & 1) { | |
353 | cpu_physical_memory_set_dirty(addr); | |
bd836776 AG |
354 | } else if (r < 0) { |
355 | /* When our KVM implementation doesn't know about dirty logging | |
356 | * we can just assume it's always dirty and be fine. */ | |
357 | cpu_physical_memory_set_dirty(addr); | |
151f7749 JK |
358 | } |
359 | } | |
360 | start_addr = phys_addr; | |
5832d1f2 | 361 | } |
5832d1f2 | 362 | qemu_free(d.dirty_bitmap); |
151f7749 JK |
363 | |
364 | return ret; | |
5832d1f2 AL |
365 | } |
366 | ||
f65ed4c1 AL |
367 | int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) |
368 | { | |
369 | int ret = -ENOSYS; | |
370 | #ifdef KVM_CAP_COALESCED_MMIO | |
371 | KVMState *s = kvm_state; | |
372 | ||
373 | if (s->coalesced_mmio) { | |
374 | struct kvm_coalesced_mmio_zone zone; | |
375 | ||
376 | zone.addr = start; | |
377 | zone.size = size; | |
378 | ||
379 | ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); | |
380 | } | |
381 | #endif | |
382 | ||
383 | return ret; | |
384 | } | |
385 | ||
386 | int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) | |
387 | { | |
388 | int ret = -ENOSYS; | |
389 | #ifdef KVM_CAP_COALESCED_MMIO | |
390 | KVMState *s = kvm_state; | |
391 | ||
392 | if (s->coalesced_mmio) { | |
393 | struct kvm_coalesced_mmio_zone zone; | |
394 | ||
395 | zone.addr = start; | |
396 | zone.size = size; | |
397 | ||
398 | ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); | |
399 | } | |
400 | #endif | |
401 | ||
402 | return ret; | |
403 | } | |
404 | ||
ad7b8b33 AL |
405 | int kvm_check_extension(KVMState *s, unsigned int extension) |
406 | { | |
407 | int ret; | |
408 | ||
409 | ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension); | |
410 | if (ret < 0) { | |
411 | ret = 0; | |
412 | } | |
413 | ||
414 | return ret; | |
415 | } | |
416 | ||
05330448 AL |
417 | int kvm_init(int smp_cpus) |
418 | { | |
168ccc11 JK |
419 | static const char upgrade_note[] = |
420 | "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n" | |
421 | "(see http://sourceforge.net/projects/kvm).\n"; | |
05330448 AL |
422 | KVMState *s; |
423 | int ret; | |
424 | int i; | |
425 | ||
9f8fd694 MM |
426 | if (smp_cpus > 1) { |
427 | fprintf(stderr, "No SMP KVM support, use '-smp 1'\n"); | |
05330448 | 428 | return -EINVAL; |
9f8fd694 | 429 | } |
05330448 AL |
430 | |
431 | s = qemu_mallocz(sizeof(KVMState)); | |
05330448 | 432 | |
e22a25c9 AL |
433 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
434 | TAILQ_INIT(&s->kvm_sw_breakpoints); | |
435 | #endif | |
05330448 AL |
436 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
437 | s->slots[i].slot = i; | |
438 | ||
439 | s->vmfd = -1; | |
440 | s->fd = open("/dev/kvm", O_RDWR); | |
441 | if (s->fd == -1) { | |
442 | fprintf(stderr, "Could not access KVM kernel module: %m\n"); | |
443 | ret = -errno; | |
444 | goto err; | |
445 | } | |
446 | ||
447 | ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0); | |
448 | if (ret < KVM_API_VERSION) { | |
449 | if (ret > 0) | |
450 | ret = -EINVAL; | |
451 | fprintf(stderr, "kvm version too old\n"); | |
452 | goto err; | |
453 | } | |
454 | ||
455 | if (ret > KVM_API_VERSION) { | |
456 | ret = -EINVAL; | |
457 | fprintf(stderr, "kvm version not supported\n"); | |
458 | goto err; | |
459 | } | |
460 | ||
461 | s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0); | |
462 | if (s->vmfd < 0) | |
463 | goto err; | |
464 | ||
465 | /* initially, KVM allocated its own memory and we had to jump through | |
466 | * hooks to make phys_ram_base point to this. Modern versions of KVM | |
5579c7f3 | 467 | * just use a user allocated buffer so we can use regular pages |
05330448 AL |
468 | * unmodified. Make sure we have a sufficiently modern version of KVM. |
469 | */ | |
ad7b8b33 AL |
470 | if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) { |
471 | ret = -EINVAL; | |
168ccc11 JK |
472 | fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s", |
473 | upgrade_note); | |
05330448 AL |
474 | goto err; |
475 | } | |
476 | ||
d85dc283 AL |
477 | /* There was a nasty bug in < kvm-80 that prevents memory slots from being |
478 | * destroyed properly. Since we rely on this capability, refuse to work | |
479 | * with any kernel without this capability. */ | |
ad7b8b33 AL |
480 | if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) { |
481 | ret = -EINVAL; | |
d85dc283 AL |
482 | |
483 | fprintf(stderr, | |
168ccc11 JK |
484 | "KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s", |
485 | upgrade_note); | |
d85dc283 AL |
486 | goto err; |
487 | } | |
488 | ||
f65ed4c1 | 489 | #ifdef KVM_CAP_COALESCED_MMIO |
ad7b8b33 AL |
490 | s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); |
491 | #else | |
492 | s->coalesced_mmio = 0; | |
f65ed4c1 AL |
493 | #endif |
494 | ||
e69917e2 JK |
495 | s->broken_set_mem_region = 1; |
496 | #ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS | |
497 | ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS); | |
498 | if (ret > 0) { | |
499 | s->broken_set_mem_region = 0; | |
500 | } | |
501 | #endif | |
502 | ||
05330448 AL |
503 | ret = kvm_arch_init(s, smp_cpus); |
504 | if (ret < 0) | |
505 | goto err; | |
506 | ||
507 | kvm_state = s; | |
508 | ||
509 | return 0; | |
510 | ||
511 | err: | |
512 | if (s) { | |
513 | if (s->vmfd != -1) | |
514 | close(s->vmfd); | |
515 | if (s->fd != -1) | |
516 | close(s->fd); | |
517 | } | |
518 | qemu_free(s); | |
519 | ||
520 | return ret; | |
521 | } | |
522 | ||
523 | static int kvm_handle_io(CPUState *env, uint16_t port, void *data, | |
524 | int direction, int size, uint32_t count) | |
525 | { | |
526 | int i; | |
527 | uint8_t *ptr = data; | |
528 | ||
529 | for (i = 0; i < count; i++) { | |
530 | if (direction == KVM_EXIT_IO_IN) { | |
531 | switch (size) { | |
532 | case 1: | |
533 | stb_p(ptr, cpu_inb(env, port)); | |
534 | break; | |
535 | case 2: | |
536 | stw_p(ptr, cpu_inw(env, port)); | |
537 | break; | |
538 | case 4: | |
539 | stl_p(ptr, cpu_inl(env, port)); | |
540 | break; | |
541 | } | |
542 | } else { | |
543 | switch (size) { | |
544 | case 1: | |
545 | cpu_outb(env, port, ldub_p(ptr)); | |
546 | break; | |
547 | case 2: | |
548 | cpu_outw(env, port, lduw_p(ptr)); | |
549 | break; | |
550 | case 4: | |
551 | cpu_outl(env, port, ldl_p(ptr)); | |
552 | break; | |
553 | } | |
554 | } | |
555 | ||
556 | ptr += size; | |
557 | } | |
558 | ||
559 | return 1; | |
560 | } | |
561 | ||
f65ed4c1 AL |
562 | static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run) |
563 | { | |
564 | #ifdef KVM_CAP_COALESCED_MMIO | |
565 | KVMState *s = kvm_state; | |
566 | if (s->coalesced_mmio) { | |
567 | struct kvm_coalesced_mmio_ring *ring; | |
568 | ||
569 | ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE); | |
570 | while (ring->first != ring->last) { | |
571 | struct kvm_coalesced_mmio *ent; | |
572 | ||
573 | ent = &ring->coalesced_mmio[ring->first]; | |
574 | ||
575 | cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); | |
576 | /* FIXME smp_wmb() */ | |
577 | ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX; | |
578 | } | |
579 | } | |
580 | #endif | |
581 | } | |
582 | ||
05330448 AL |
583 | int kvm_cpu_exec(CPUState *env) |
584 | { | |
585 | struct kvm_run *run = env->kvm_run; | |
586 | int ret; | |
587 | ||
588 | dprintf("kvm_cpu_exec()\n"); | |
589 | ||
590 | do { | |
be214e6c | 591 | if (env->exit_request) { |
05330448 AL |
592 | dprintf("interrupt exit requested\n"); |
593 | ret = 0; | |
594 | break; | |
595 | } | |
596 | ||
8c14c173 | 597 | kvm_arch_pre_run(env, run); |
05330448 AL |
598 | ret = kvm_vcpu_ioctl(env, KVM_RUN, 0); |
599 | kvm_arch_post_run(env, run); | |
600 | ||
601 | if (ret == -EINTR || ret == -EAGAIN) { | |
602 | dprintf("io window exit\n"); | |
603 | ret = 0; | |
604 | break; | |
605 | } | |
606 | ||
607 | if (ret < 0) { | |
608 | dprintf("kvm run failed %s\n", strerror(-ret)); | |
609 | abort(); | |
610 | } | |
611 | ||
f65ed4c1 AL |
612 | kvm_run_coalesced_mmio(env, run); |
613 | ||
05330448 AL |
614 | ret = 0; /* exit loop */ |
615 | switch (run->exit_reason) { | |
616 | case KVM_EXIT_IO: | |
617 | dprintf("handle_io\n"); | |
618 | ret = kvm_handle_io(env, run->io.port, | |
619 | (uint8_t *)run + run->io.data_offset, | |
620 | run->io.direction, | |
621 | run->io.size, | |
622 | run->io.count); | |
623 | break; | |
624 | case KVM_EXIT_MMIO: | |
625 | dprintf("handle_mmio\n"); | |
626 | cpu_physical_memory_rw(run->mmio.phys_addr, | |
627 | run->mmio.data, | |
628 | run->mmio.len, | |
629 | run->mmio.is_write); | |
630 | ret = 1; | |
631 | break; | |
632 | case KVM_EXIT_IRQ_WINDOW_OPEN: | |
633 | dprintf("irq_window_open\n"); | |
634 | break; | |
635 | case KVM_EXIT_SHUTDOWN: | |
636 | dprintf("shutdown\n"); | |
637 | qemu_system_reset_request(); | |
638 | ret = 1; | |
639 | break; | |
640 | case KVM_EXIT_UNKNOWN: | |
641 | dprintf("kvm_exit_unknown\n"); | |
642 | break; | |
643 | case KVM_EXIT_FAIL_ENTRY: | |
644 | dprintf("kvm_exit_fail_entry\n"); | |
645 | break; | |
646 | case KVM_EXIT_EXCEPTION: | |
647 | dprintf("kvm_exit_exception\n"); | |
648 | break; | |
649 | case KVM_EXIT_DEBUG: | |
650 | dprintf("kvm_exit_debug\n"); | |
e22a25c9 AL |
651 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
652 | if (kvm_arch_debug(&run->debug.arch)) { | |
653 | gdb_set_stop_cpu(env); | |
654 | vm_stop(EXCP_DEBUG); | |
655 | env->exception_index = EXCP_DEBUG; | |
656 | return 0; | |
657 | } | |
658 | /* re-enter, this exception was guest-internal */ | |
659 | ret = 1; | |
660 | #endif /* KVM_CAP_SET_GUEST_DEBUG */ | |
05330448 AL |
661 | break; |
662 | default: | |
663 | dprintf("kvm_arch_handle_exit\n"); | |
664 | ret = kvm_arch_handle_exit(env, run); | |
665 | break; | |
666 | } | |
667 | } while (ret > 0); | |
668 | ||
be214e6c AJ |
669 | if (env->exit_request) { |
670 | env->exit_request = 0; | |
becfc390 AL |
671 | env->exception_index = EXCP_INTERRUPT; |
672 | } | |
673 | ||
05330448 AL |
674 | return ret; |
675 | } | |
676 | ||
677 | void kvm_set_phys_mem(target_phys_addr_t start_addr, | |
678 | ram_addr_t size, | |
679 | ram_addr_t phys_offset) | |
680 | { | |
681 | KVMState *s = kvm_state; | |
682 | ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; | |
6152e2ae AL |
683 | KVMSlot *mem, old; |
684 | int err; | |
05330448 | 685 | |
d3f8d37f | 686 | if (start_addr & ~TARGET_PAGE_MASK) { |
e6f4afe0 JK |
687 | if (flags >= IO_MEM_UNASSIGNED) { |
688 | if (!kvm_lookup_overlapping_slot(s, start_addr, | |
689 | start_addr + size)) { | |
690 | return; | |
691 | } | |
692 | fprintf(stderr, "Unaligned split of a KVM memory slot\n"); | |
693 | } else { | |
694 | fprintf(stderr, "Only page-aligned memory slots supported\n"); | |
695 | } | |
d3f8d37f AL |
696 | abort(); |
697 | } | |
698 | ||
05330448 AL |
699 | /* KVM does not support read-only slots */ |
700 | phys_offset &= ~IO_MEM_ROM; | |
701 | ||
6152e2ae AL |
702 | while (1) { |
703 | mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size); | |
704 | if (!mem) { | |
705 | break; | |
706 | } | |
62d60e8c | 707 | |
6152e2ae AL |
708 | if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr && |
709 | (start_addr + size <= mem->start_addr + mem->memory_size) && | |
710 | (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) { | |
711 | /* The new slot fits into the existing one and comes with | |
712 | * identical parameters - nothing to be done. */ | |
05330448 | 713 | return; |
6152e2ae AL |
714 | } |
715 | ||
716 | old = *mem; | |
717 | ||
718 | /* unregister the overlapping slot */ | |
719 | mem->memory_size = 0; | |
720 | err = kvm_set_user_memory_region(s, mem); | |
721 | if (err) { | |
722 | fprintf(stderr, "%s: error unregistering overlapping slot: %s\n", | |
723 | __func__, strerror(-err)); | |
62d60e8c AL |
724 | abort(); |
725 | } | |
6152e2ae AL |
726 | |
727 | /* Workaround for older KVM versions: we can't join slots, even not by | |
728 | * unregistering the previous ones and then registering the larger | |
729 | * slot. We have to maintain the existing fragmentation. Sigh. | |
730 | * | |
731 | * This workaround assumes that the new slot starts at the same | |
732 | * address as the first existing one. If not or if some overlapping | |
733 | * slot comes around later, we will fail (not seen in practice so far) | |
734 | * - and actually require a recent KVM version. */ | |
e69917e2 JK |
735 | if (s->broken_set_mem_region && |
736 | old.start_addr == start_addr && old.memory_size < size && | |
6152e2ae AL |
737 | flags < IO_MEM_UNASSIGNED) { |
738 | mem = kvm_alloc_slot(s); | |
739 | mem->memory_size = old.memory_size; | |
740 | mem->start_addr = old.start_addr; | |
741 | mem->phys_offset = old.phys_offset; | |
742 | mem->flags = 0; | |
743 | ||
744 | err = kvm_set_user_memory_region(s, mem); | |
745 | if (err) { | |
746 | fprintf(stderr, "%s: error updating slot: %s\n", __func__, | |
747 | strerror(-err)); | |
748 | abort(); | |
749 | } | |
750 | ||
751 | start_addr += old.memory_size; | |
752 | phys_offset += old.memory_size; | |
753 | size -= old.memory_size; | |
754 | continue; | |
755 | } | |
756 | ||
757 | /* register prefix slot */ | |
758 | if (old.start_addr < start_addr) { | |
759 | mem = kvm_alloc_slot(s); | |
760 | mem->memory_size = start_addr - old.start_addr; | |
761 | mem->start_addr = old.start_addr; | |
762 | mem->phys_offset = old.phys_offset; | |
763 | mem->flags = 0; | |
764 | ||
765 | err = kvm_set_user_memory_region(s, mem); | |
766 | if (err) { | |
767 | fprintf(stderr, "%s: error registering prefix slot: %s\n", | |
768 | __func__, strerror(-err)); | |
769 | abort(); | |
770 | } | |
771 | } | |
772 | ||
773 | /* register suffix slot */ | |
774 | if (old.start_addr + old.memory_size > start_addr + size) { | |
775 | ram_addr_t size_delta; | |
776 | ||
777 | mem = kvm_alloc_slot(s); | |
778 | mem->start_addr = start_addr + size; | |
779 | size_delta = mem->start_addr - old.start_addr; | |
780 | mem->memory_size = old.memory_size - size_delta; | |
781 | mem->phys_offset = old.phys_offset + size_delta; | |
782 | mem->flags = 0; | |
783 | ||
784 | err = kvm_set_user_memory_region(s, mem); | |
785 | if (err) { | |
786 | fprintf(stderr, "%s: error registering suffix slot: %s\n", | |
787 | __func__, strerror(-err)); | |
788 | abort(); | |
789 | } | |
790 | } | |
05330448 | 791 | } |
6152e2ae AL |
792 | |
793 | /* in case the KVM bug workaround already "consumed" the new slot */ | |
794 | if (!size) | |
795 | return; | |
796 | ||
05330448 AL |
797 | /* KVM does not need to know about this memory */ |
798 | if (flags >= IO_MEM_UNASSIGNED) | |
799 | return; | |
800 | ||
801 | mem = kvm_alloc_slot(s); | |
802 | mem->memory_size = size; | |
34fc643f AL |
803 | mem->start_addr = start_addr; |
804 | mem->phys_offset = phys_offset; | |
05330448 AL |
805 | mem->flags = 0; |
806 | ||
6152e2ae AL |
807 | err = kvm_set_user_memory_region(s, mem); |
808 | if (err) { | |
809 | fprintf(stderr, "%s: error registering slot: %s\n", __func__, | |
810 | strerror(-err)); | |
811 | abort(); | |
812 | } | |
05330448 AL |
813 | } |
814 | ||
984b5181 | 815 | int kvm_ioctl(KVMState *s, int type, ...) |
05330448 AL |
816 | { |
817 | int ret; | |
984b5181 AL |
818 | void *arg; |
819 | va_list ap; | |
05330448 | 820 | |
984b5181 AL |
821 | va_start(ap, type); |
822 | arg = va_arg(ap, void *); | |
823 | va_end(ap); | |
824 | ||
825 | ret = ioctl(s->fd, type, arg); | |
05330448 AL |
826 | if (ret == -1) |
827 | ret = -errno; | |
828 | ||
829 | return ret; | |
830 | } | |
831 | ||
984b5181 | 832 | int kvm_vm_ioctl(KVMState *s, int type, ...) |
05330448 AL |
833 | { |
834 | int ret; | |
984b5181 AL |
835 | void *arg; |
836 | va_list ap; | |
837 | ||
838 | va_start(ap, type); | |
839 | arg = va_arg(ap, void *); | |
840 | va_end(ap); | |
05330448 | 841 | |
984b5181 | 842 | ret = ioctl(s->vmfd, type, arg); |
05330448 AL |
843 | if (ret == -1) |
844 | ret = -errno; | |
845 | ||
846 | return ret; | |
847 | } | |
848 | ||
984b5181 | 849 | int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
05330448 AL |
850 | { |
851 | int ret; | |
984b5181 AL |
852 | void *arg; |
853 | va_list ap; | |
854 | ||
855 | va_start(ap, type); | |
856 | arg = va_arg(ap, void *); | |
857 | va_end(ap); | |
05330448 | 858 | |
984b5181 | 859 | ret = ioctl(env->kvm_fd, type, arg); |
05330448 AL |
860 | if (ret == -1) |
861 | ret = -errno; | |
862 | ||
863 | return ret; | |
864 | } | |
bd322087 AL |
865 | |
866 | int kvm_has_sync_mmu(void) | |
867 | { | |
a9c11522 | 868 | #ifdef KVM_CAP_SYNC_MMU |
bd322087 AL |
869 | KVMState *s = kvm_state; |
870 | ||
ad7b8b33 AL |
871 | return kvm_check_extension(s, KVM_CAP_SYNC_MMU); |
872 | #else | |
bd322087 | 873 | return 0; |
ad7b8b33 | 874 | #endif |
bd322087 | 875 | } |
e22a25c9 | 876 | |
6f0437e8 JK |
877 | void kvm_setup_guest_memory(void *start, size_t size) |
878 | { | |
879 | if (!kvm_has_sync_mmu()) { | |
880 | #ifdef MADV_DONTFORK | |
881 | int ret = madvise(start, size, MADV_DONTFORK); | |
882 | ||
883 | if (ret) { | |
884 | perror("madvice"); | |
885 | exit(1); | |
886 | } | |
887 | #else | |
888 | fprintf(stderr, | |
889 | "Need MADV_DONTFORK in absence of synchronous KVM MMU\n"); | |
890 | exit(1); | |
891 | #endif | |
892 | } | |
893 | } | |
894 | ||
e22a25c9 AL |
895 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
896 | struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env, | |
897 | target_ulong pc) | |
898 | { | |
899 | struct kvm_sw_breakpoint *bp; | |
900 | ||
901 | TAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) { | |
902 | if (bp->pc == pc) | |
903 | return bp; | |
904 | } | |
905 | return NULL; | |
906 | } | |
907 | ||
908 | int kvm_sw_breakpoints_active(CPUState *env) | |
909 | { | |
910 | return !TAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints); | |
911 | } | |
912 | ||
452e4751 GC |
913 | struct kvm_set_guest_debug_data { |
914 | struct kvm_guest_debug dbg; | |
915 | CPUState *env; | |
916 | int err; | |
917 | }; | |
918 | ||
919 | static void kvm_invoke_set_guest_debug(void *data) | |
920 | { | |
921 | struct kvm_set_guest_debug_data *dbg_data = data; | |
922 | dbg_data->err = kvm_vcpu_ioctl(dbg_data->env, KVM_SET_GUEST_DEBUG, &dbg_data->dbg); | |
923 | } | |
924 | ||
e22a25c9 AL |
925 | int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
926 | { | |
452e4751 | 927 | struct kvm_set_guest_debug_data data; |
e22a25c9 | 928 | |
452e4751 | 929 | data.dbg.control = 0; |
e22a25c9 | 930 | if (env->singlestep_enabled) |
452e4751 | 931 | data.dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; |
e22a25c9 | 932 | |
452e4751 GC |
933 | kvm_arch_update_guest_debug(env, &data.dbg); |
934 | data.dbg.control |= reinject_trap; | |
935 | data.env = env; | |
e22a25c9 | 936 | |
452e4751 GC |
937 | on_vcpu(env, kvm_invoke_set_guest_debug, &data); |
938 | return data.err; | |
e22a25c9 AL |
939 | } |
940 | ||
941 | int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, | |
942 | target_ulong len, int type) | |
943 | { | |
944 | struct kvm_sw_breakpoint *bp; | |
945 | CPUState *env; | |
946 | int err; | |
947 | ||
948 | if (type == GDB_BREAKPOINT_SW) { | |
949 | bp = kvm_find_sw_breakpoint(current_env, addr); | |
950 | if (bp) { | |
951 | bp->use_count++; | |
952 | return 0; | |
953 | } | |
954 | ||
955 | bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint)); | |
956 | if (!bp) | |
957 | return -ENOMEM; | |
958 | ||
959 | bp->pc = addr; | |
960 | bp->use_count = 1; | |
961 | err = kvm_arch_insert_sw_breakpoint(current_env, bp); | |
962 | if (err) { | |
963 | free(bp); | |
964 | return err; | |
965 | } | |
966 | ||
967 | TAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints, | |
968 | bp, entry); | |
969 | } else { | |
970 | err = kvm_arch_insert_hw_breakpoint(addr, len, type); | |
971 | if (err) | |
972 | return err; | |
973 | } | |
974 | ||
975 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
976 | err = kvm_update_guest_debug(env, 0); | |
977 | if (err) | |
978 | return err; | |
979 | } | |
980 | return 0; | |
981 | } | |
982 | ||
983 | int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, | |
984 | target_ulong len, int type) | |
985 | { | |
986 | struct kvm_sw_breakpoint *bp; | |
987 | CPUState *env; | |
988 | int err; | |
989 | ||
990 | if (type == GDB_BREAKPOINT_SW) { | |
991 | bp = kvm_find_sw_breakpoint(current_env, addr); | |
992 | if (!bp) | |
993 | return -ENOENT; | |
994 | ||
995 | if (bp->use_count > 1) { | |
996 | bp->use_count--; | |
997 | return 0; | |
998 | } | |
999 | ||
1000 | err = kvm_arch_remove_sw_breakpoint(current_env, bp); | |
1001 | if (err) | |
1002 | return err; | |
1003 | ||
1004 | TAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry); | |
1005 | qemu_free(bp); | |
1006 | } else { | |
1007 | err = kvm_arch_remove_hw_breakpoint(addr, len, type); | |
1008 | if (err) | |
1009 | return err; | |
1010 | } | |
1011 | ||
1012 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
1013 | err = kvm_update_guest_debug(env, 0); | |
1014 | if (err) | |
1015 | return err; | |
1016 | } | |
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | void kvm_remove_all_breakpoints(CPUState *current_env) | |
1021 | { | |
1022 | struct kvm_sw_breakpoint *bp, *next; | |
1023 | KVMState *s = current_env->kvm_state; | |
1024 | CPUState *env; | |
1025 | ||
1026 | TAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { | |
1027 | if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) { | |
1028 | /* Try harder to find a CPU that currently sees the breakpoint. */ | |
1029 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
1030 | if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) | |
1031 | break; | |
1032 | } | |
1033 | } | |
1034 | } | |
1035 | kvm_arch_remove_all_hw_breakpoints(); | |
1036 | ||
1037 | for (env = first_cpu; env != NULL; env = env->next_cpu) | |
1038 | kvm_update_guest_debug(env, 0); | |
1039 | } | |
1040 | ||
1041 | #else /* !KVM_CAP_SET_GUEST_DEBUG */ | |
1042 | ||
1043 | int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) | |
1044 | { | |
1045 | return -EINVAL; | |
1046 | } | |
1047 | ||
1048 | int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, | |
1049 | target_ulong len, int type) | |
1050 | { | |
1051 | return -EINVAL; | |
1052 | } | |
1053 | ||
1054 | int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, | |
1055 | target_ulong len, int type) | |
1056 | { | |
1057 | return -EINVAL; | |
1058 | } | |
1059 | ||
1060 | void kvm_remove_all_breakpoints(CPUState *current_env) | |
1061 | { | |
1062 | } | |
1063 | #endif /* !KVM_CAP_SET_GUEST_DEBUG */ |