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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" | |
e22a25c9 | 25 | #include "gdbstub.h" |
05330448 AL |
26 | #include "kvm.h" |
27 | ||
f65ed4c1 AL |
28 | /* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */ |
29 | #define PAGE_SIZE TARGET_PAGE_SIZE | |
30 | ||
05330448 AL |
31 | //#define DEBUG_KVM |
32 | ||
33 | #ifdef DEBUG_KVM | |
34 | #define dprintf(fmt, ...) \ | |
35 | do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) | |
36 | #else | |
37 | #define dprintf(fmt, ...) \ | |
38 | do { } while (0) | |
39 | #endif | |
40 | ||
34fc643f AL |
41 | typedef struct KVMSlot |
42 | { | |
43 | target_phys_addr_t start_addr; | |
44 | ram_addr_t memory_size; | |
45 | ram_addr_t phys_offset; | |
46 | int slot; | |
47 | int flags; | |
48 | } KVMSlot; | |
05330448 | 49 | |
5832d1f2 AL |
50 | typedef struct kvm_dirty_log KVMDirtyLog; |
51 | ||
05330448 AL |
52 | int kvm_allowed = 0; |
53 | ||
54 | struct KVMState | |
55 | { | |
56 | KVMSlot slots[32]; | |
57 | int fd; | |
58 | int vmfd; | |
f65ed4c1 | 59 | int coalesced_mmio; |
e69917e2 | 60 | int broken_set_mem_region; |
4495d6a7 | 61 | int migration_log; |
e22a25c9 AL |
62 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
63 | struct kvm_sw_breakpoint_head kvm_sw_breakpoints; | |
64 | #endif | |
05330448 AL |
65 | }; |
66 | ||
67 | static KVMState *kvm_state; | |
68 | ||
69 | static KVMSlot *kvm_alloc_slot(KVMState *s) | |
70 | { | |
71 | int i; | |
72 | ||
73 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
62d60e8c AL |
74 | /* KVM private memory slots */ |
75 | if (i >= 8 && i < 12) | |
76 | continue; | |
05330448 AL |
77 | if (s->slots[i].memory_size == 0) |
78 | return &s->slots[i]; | |
79 | } | |
80 | ||
d3f8d37f AL |
81 | fprintf(stderr, "%s: no free slot available\n", __func__); |
82 | abort(); | |
83 | } | |
84 | ||
85 | static KVMSlot *kvm_lookup_matching_slot(KVMState *s, | |
86 | target_phys_addr_t start_addr, | |
87 | target_phys_addr_t end_addr) | |
88 | { | |
89 | int i; | |
90 | ||
91 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
92 | KVMSlot *mem = &s->slots[i]; | |
93 | ||
94 | if (start_addr == mem->start_addr && | |
95 | end_addr == mem->start_addr + mem->memory_size) { | |
96 | return mem; | |
97 | } | |
98 | } | |
99 | ||
05330448 AL |
100 | return NULL; |
101 | } | |
102 | ||
6152e2ae AL |
103 | /* |
104 | * Find overlapping slot with lowest start address | |
105 | */ | |
106 | static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s, | |
107 | target_phys_addr_t start_addr, | |
108 | target_phys_addr_t end_addr) | |
05330448 | 109 | { |
6152e2ae | 110 | KVMSlot *found = NULL; |
05330448 AL |
111 | int i; |
112 | ||
113 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
114 | KVMSlot *mem = &s->slots[i]; | |
115 | ||
6152e2ae AL |
116 | if (mem->memory_size == 0 || |
117 | (found && found->start_addr < mem->start_addr)) { | |
118 | continue; | |
119 | } | |
120 | ||
121 | if (end_addr > mem->start_addr && | |
122 | start_addr < mem->start_addr + mem->memory_size) { | |
123 | found = mem; | |
124 | } | |
05330448 AL |
125 | } |
126 | ||
6152e2ae | 127 | return found; |
05330448 AL |
128 | } |
129 | ||
5832d1f2 AL |
130 | static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot) |
131 | { | |
132 | struct kvm_userspace_memory_region mem; | |
133 | ||
134 | mem.slot = slot->slot; | |
135 | mem.guest_phys_addr = slot->start_addr; | |
136 | mem.memory_size = slot->memory_size; | |
5579c7f3 | 137 | mem.userspace_addr = (unsigned long)qemu_get_ram_ptr(slot->phys_offset); |
5832d1f2 | 138 | mem.flags = slot->flags; |
4495d6a7 JK |
139 | if (s->migration_log) { |
140 | mem.flags |= KVM_MEM_LOG_DIRTY_PAGES; | |
141 | } | |
5832d1f2 AL |
142 | return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem); |
143 | } | |
144 | ||
145 | ||
05330448 AL |
146 | int kvm_init_vcpu(CPUState *env) |
147 | { | |
148 | KVMState *s = kvm_state; | |
149 | long mmap_size; | |
150 | int ret; | |
151 | ||
152 | dprintf("kvm_init_vcpu\n"); | |
153 | ||
984b5181 | 154 | ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index); |
05330448 AL |
155 | if (ret < 0) { |
156 | dprintf("kvm_create_vcpu failed\n"); | |
157 | goto err; | |
158 | } | |
159 | ||
160 | env->kvm_fd = ret; | |
161 | env->kvm_state = s; | |
162 | ||
163 | mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0); | |
164 | if (mmap_size < 0) { | |
165 | dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n"); | |
166 | goto err; | |
167 | } | |
168 | ||
169 | env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, | |
170 | env->kvm_fd, 0); | |
171 | if (env->kvm_run == MAP_FAILED) { | |
172 | ret = -errno; | |
173 | dprintf("mmap'ing vcpu state failed\n"); | |
174 | goto err; | |
175 | } | |
176 | ||
177 | ret = kvm_arch_init_vcpu(env); | |
178 | ||
179 | err: | |
180 | return ret; | |
181 | } | |
182 | ||
f5d6f51b AL |
183 | int kvm_sync_vcpus(void) |
184 | { | |
185 | CPUState *env; | |
186 | ||
187 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
188 | int ret; | |
189 | ||
190 | ret = kvm_arch_put_registers(env); | |
191 | if (ret) | |
192 | return ret; | |
193 | } | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
5832d1f2 AL |
198 | /* |
199 | * dirty pages logging control | |
200 | */ | |
d3f8d37f | 201 | static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr, |
4495d6a7 | 202 | ram_addr_t size, int flags, int mask) |
5832d1f2 AL |
203 | { |
204 | KVMState *s = kvm_state; | |
d3f8d37f | 205 | KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size); |
4495d6a7 JK |
206 | int old_flags; |
207 | ||
5832d1f2 | 208 | if (mem == NULL) { |
d3f8d37f AL |
209 | fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-" |
210 | TARGET_FMT_plx "\n", __func__, phys_addr, | |
211 | phys_addr + size - 1); | |
5832d1f2 AL |
212 | return -EINVAL; |
213 | } | |
214 | ||
4495d6a7 | 215 | old_flags = mem->flags; |
5832d1f2 | 216 | |
4495d6a7 | 217 | flags = (mem->flags & ~mask) | flags; |
5832d1f2 AL |
218 | mem->flags = flags; |
219 | ||
4495d6a7 JK |
220 | /* If nothing changed effectively, no need to issue ioctl */ |
221 | if (s->migration_log) { | |
222 | flags |= KVM_MEM_LOG_DIRTY_PAGES; | |
223 | } | |
224 | if (flags == old_flags) { | |
225 | return 0; | |
226 | } | |
227 | ||
5832d1f2 AL |
228 | return kvm_set_user_memory_region(s, mem); |
229 | } | |
230 | ||
d3f8d37f | 231 | int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size) |
5832d1f2 | 232 | { |
d3f8d37f | 233 | return kvm_dirty_pages_log_change(phys_addr, size, |
5832d1f2 AL |
234 | KVM_MEM_LOG_DIRTY_PAGES, |
235 | KVM_MEM_LOG_DIRTY_PAGES); | |
236 | } | |
237 | ||
d3f8d37f | 238 | int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size) |
5832d1f2 | 239 | { |
d3f8d37f | 240 | return kvm_dirty_pages_log_change(phys_addr, size, |
5832d1f2 AL |
241 | 0, |
242 | KVM_MEM_LOG_DIRTY_PAGES); | |
243 | } | |
244 | ||
4495d6a7 JK |
245 | int kvm_set_migration_log(int enable) |
246 | { | |
247 | KVMState *s = kvm_state; | |
248 | KVMSlot *mem; | |
249 | int i, err; | |
250 | ||
251 | s->migration_log = enable; | |
252 | ||
253 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
254 | mem = &s->slots[i]; | |
255 | ||
256 | if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) { | |
257 | continue; | |
258 | } | |
259 | err = kvm_set_user_memory_region(s, mem); | |
260 | if (err) { | |
261 | return err; | |
262 | } | |
263 | } | |
264 | return 0; | |
265 | } | |
266 | ||
5832d1f2 AL |
267 | /** |
268 | * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space | |
269 | * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty(). | |
270 | * This means all bits are set to dirty. | |
271 | * | |
d3f8d37f | 272 | * @start_add: start of logged region. |
5832d1f2 AL |
273 | * @end_addr: end of logged region. |
274 | */ | |
151f7749 JK |
275 | int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, |
276 | target_phys_addr_t end_addr) | |
5832d1f2 AL |
277 | { |
278 | KVMState *s = kvm_state; | |
151f7749 JK |
279 | unsigned long size, allocated_size = 0; |
280 | target_phys_addr_t phys_addr; | |
5832d1f2 | 281 | ram_addr_t addr; |
151f7749 JK |
282 | KVMDirtyLog d; |
283 | KVMSlot *mem; | |
284 | int ret = 0; | |
5832d1f2 | 285 | |
151f7749 JK |
286 | d.dirty_bitmap = NULL; |
287 | while (start_addr < end_addr) { | |
288 | mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr); | |
289 | if (mem == NULL) { | |
290 | break; | |
291 | } | |
5832d1f2 | 292 | |
151f7749 JK |
293 | size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8; |
294 | if (!d.dirty_bitmap) { | |
295 | d.dirty_bitmap = qemu_malloc(size); | |
296 | } else if (size > allocated_size) { | |
297 | d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size); | |
298 | } | |
299 | allocated_size = size; | |
300 | memset(d.dirty_bitmap, 0, allocated_size); | |
5832d1f2 | 301 | |
151f7749 | 302 | d.slot = mem->slot; |
5832d1f2 | 303 | |
151f7749 JK |
304 | if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) { |
305 | dprintf("ioctl failed %d\n", errno); | |
306 | ret = -1; | |
307 | break; | |
308 | } | |
5832d1f2 | 309 | |
151f7749 JK |
310 | for (phys_addr = mem->start_addr, addr = mem->phys_offset; |
311 | phys_addr < mem->start_addr + mem->memory_size; | |
312 | phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) { | |
313 | unsigned long *bitmap = (unsigned long *)d.dirty_bitmap; | |
314 | unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS; | |
315 | unsigned word = nr / (sizeof(*bitmap) * 8); | |
316 | unsigned bit = nr % (sizeof(*bitmap) * 8); | |
317 | ||
318 | if ((bitmap[word] >> bit) & 1) { | |
319 | cpu_physical_memory_set_dirty(addr); | |
320 | } | |
321 | } | |
322 | start_addr = phys_addr; | |
5832d1f2 | 323 | } |
5832d1f2 | 324 | qemu_free(d.dirty_bitmap); |
151f7749 JK |
325 | |
326 | return ret; | |
5832d1f2 AL |
327 | } |
328 | ||
f65ed4c1 AL |
329 | int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) |
330 | { | |
331 | int ret = -ENOSYS; | |
332 | #ifdef KVM_CAP_COALESCED_MMIO | |
333 | KVMState *s = kvm_state; | |
334 | ||
335 | if (s->coalesced_mmio) { | |
336 | struct kvm_coalesced_mmio_zone zone; | |
337 | ||
338 | zone.addr = start; | |
339 | zone.size = size; | |
340 | ||
341 | ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); | |
342 | } | |
343 | #endif | |
344 | ||
345 | return ret; | |
346 | } | |
347 | ||
348 | int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) | |
349 | { | |
350 | int ret = -ENOSYS; | |
351 | #ifdef KVM_CAP_COALESCED_MMIO | |
352 | KVMState *s = kvm_state; | |
353 | ||
354 | if (s->coalesced_mmio) { | |
355 | struct kvm_coalesced_mmio_zone zone; | |
356 | ||
357 | zone.addr = start; | |
358 | zone.size = size; | |
359 | ||
360 | ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); | |
361 | } | |
362 | #endif | |
363 | ||
364 | return ret; | |
365 | } | |
366 | ||
ad7b8b33 AL |
367 | int kvm_check_extension(KVMState *s, unsigned int extension) |
368 | { | |
369 | int ret; | |
370 | ||
371 | ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension); | |
372 | if (ret < 0) { | |
373 | ret = 0; | |
374 | } | |
375 | ||
376 | return ret; | |
377 | } | |
378 | ||
05330448 AL |
379 | int kvm_init(int smp_cpus) |
380 | { | |
381 | KVMState *s; | |
382 | int ret; | |
383 | int i; | |
384 | ||
9f8fd694 MM |
385 | if (smp_cpus > 1) { |
386 | fprintf(stderr, "No SMP KVM support, use '-smp 1'\n"); | |
05330448 | 387 | return -EINVAL; |
9f8fd694 | 388 | } |
05330448 AL |
389 | |
390 | s = qemu_mallocz(sizeof(KVMState)); | |
05330448 | 391 | |
e22a25c9 AL |
392 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
393 | TAILQ_INIT(&s->kvm_sw_breakpoints); | |
394 | #endif | |
05330448 AL |
395 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
396 | s->slots[i].slot = i; | |
397 | ||
398 | s->vmfd = -1; | |
399 | s->fd = open("/dev/kvm", O_RDWR); | |
400 | if (s->fd == -1) { | |
401 | fprintf(stderr, "Could not access KVM kernel module: %m\n"); | |
402 | ret = -errno; | |
403 | goto err; | |
404 | } | |
405 | ||
406 | ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0); | |
407 | if (ret < KVM_API_VERSION) { | |
408 | if (ret > 0) | |
409 | ret = -EINVAL; | |
410 | fprintf(stderr, "kvm version too old\n"); | |
411 | goto err; | |
412 | } | |
413 | ||
414 | if (ret > KVM_API_VERSION) { | |
415 | ret = -EINVAL; | |
416 | fprintf(stderr, "kvm version not supported\n"); | |
417 | goto err; | |
418 | } | |
419 | ||
420 | s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0); | |
421 | if (s->vmfd < 0) | |
422 | goto err; | |
423 | ||
424 | /* initially, KVM allocated its own memory and we had to jump through | |
425 | * hooks to make phys_ram_base point to this. Modern versions of KVM | |
5579c7f3 | 426 | * just use a user allocated buffer so we can use regular pages |
05330448 AL |
427 | * unmodified. Make sure we have a sufficiently modern version of KVM. |
428 | */ | |
ad7b8b33 AL |
429 | if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) { |
430 | ret = -EINVAL; | |
05330448 AL |
431 | fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n"); |
432 | goto err; | |
433 | } | |
434 | ||
d85dc283 AL |
435 | /* There was a nasty bug in < kvm-80 that prevents memory slots from being |
436 | * destroyed properly. Since we rely on this capability, refuse to work | |
437 | * with any kernel without this capability. */ | |
ad7b8b33 AL |
438 | if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) { |
439 | ret = -EINVAL; | |
d85dc283 AL |
440 | |
441 | fprintf(stderr, | |
442 | "KVM kernel module broken (DESTROY_MEMORY_REGION)\n" | |
443 | "Please upgrade to at least kvm-81.\n"); | |
444 | goto err; | |
445 | } | |
446 | ||
f65ed4c1 | 447 | #ifdef KVM_CAP_COALESCED_MMIO |
ad7b8b33 AL |
448 | s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); |
449 | #else | |
450 | s->coalesced_mmio = 0; | |
f65ed4c1 AL |
451 | #endif |
452 | ||
e69917e2 JK |
453 | s->broken_set_mem_region = 1; |
454 | #ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS | |
455 | ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS); | |
456 | if (ret > 0) { | |
457 | s->broken_set_mem_region = 0; | |
458 | } | |
459 | #endif | |
460 | ||
05330448 AL |
461 | ret = kvm_arch_init(s, smp_cpus); |
462 | if (ret < 0) | |
463 | goto err; | |
464 | ||
465 | kvm_state = s; | |
466 | ||
467 | return 0; | |
468 | ||
469 | err: | |
470 | if (s) { | |
471 | if (s->vmfd != -1) | |
472 | close(s->vmfd); | |
473 | if (s->fd != -1) | |
474 | close(s->fd); | |
475 | } | |
476 | qemu_free(s); | |
477 | ||
478 | return ret; | |
479 | } | |
480 | ||
481 | static int kvm_handle_io(CPUState *env, uint16_t port, void *data, | |
482 | int direction, int size, uint32_t count) | |
483 | { | |
484 | int i; | |
485 | uint8_t *ptr = data; | |
486 | ||
487 | for (i = 0; i < count; i++) { | |
488 | if (direction == KVM_EXIT_IO_IN) { | |
489 | switch (size) { | |
490 | case 1: | |
491 | stb_p(ptr, cpu_inb(env, port)); | |
492 | break; | |
493 | case 2: | |
494 | stw_p(ptr, cpu_inw(env, port)); | |
495 | break; | |
496 | case 4: | |
497 | stl_p(ptr, cpu_inl(env, port)); | |
498 | break; | |
499 | } | |
500 | } else { | |
501 | switch (size) { | |
502 | case 1: | |
503 | cpu_outb(env, port, ldub_p(ptr)); | |
504 | break; | |
505 | case 2: | |
506 | cpu_outw(env, port, lduw_p(ptr)); | |
507 | break; | |
508 | case 4: | |
509 | cpu_outl(env, port, ldl_p(ptr)); | |
510 | break; | |
511 | } | |
512 | } | |
513 | ||
514 | ptr += size; | |
515 | } | |
516 | ||
517 | return 1; | |
518 | } | |
519 | ||
f65ed4c1 AL |
520 | static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run) |
521 | { | |
522 | #ifdef KVM_CAP_COALESCED_MMIO | |
523 | KVMState *s = kvm_state; | |
524 | if (s->coalesced_mmio) { | |
525 | struct kvm_coalesced_mmio_ring *ring; | |
526 | ||
527 | ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE); | |
528 | while (ring->first != ring->last) { | |
529 | struct kvm_coalesced_mmio *ent; | |
530 | ||
531 | ent = &ring->coalesced_mmio[ring->first]; | |
532 | ||
533 | cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); | |
534 | /* FIXME smp_wmb() */ | |
535 | ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX; | |
536 | } | |
537 | } | |
538 | #endif | |
539 | } | |
540 | ||
05330448 AL |
541 | int kvm_cpu_exec(CPUState *env) |
542 | { | |
543 | struct kvm_run *run = env->kvm_run; | |
544 | int ret; | |
545 | ||
546 | dprintf("kvm_cpu_exec()\n"); | |
547 | ||
548 | do { | |
549 | kvm_arch_pre_run(env, run); | |
550 | ||
be214e6c | 551 | if (env->exit_request) { |
05330448 AL |
552 | dprintf("interrupt exit requested\n"); |
553 | ret = 0; | |
554 | break; | |
555 | } | |
556 | ||
557 | ret = kvm_vcpu_ioctl(env, KVM_RUN, 0); | |
558 | kvm_arch_post_run(env, run); | |
559 | ||
560 | if (ret == -EINTR || ret == -EAGAIN) { | |
561 | dprintf("io window exit\n"); | |
562 | ret = 0; | |
563 | break; | |
564 | } | |
565 | ||
566 | if (ret < 0) { | |
567 | dprintf("kvm run failed %s\n", strerror(-ret)); | |
568 | abort(); | |
569 | } | |
570 | ||
f65ed4c1 AL |
571 | kvm_run_coalesced_mmio(env, run); |
572 | ||
05330448 AL |
573 | ret = 0; /* exit loop */ |
574 | switch (run->exit_reason) { | |
575 | case KVM_EXIT_IO: | |
576 | dprintf("handle_io\n"); | |
577 | ret = kvm_handle_io(env, run->io.port, | |
578 | (uint8_t *)run + run->io.data_offset, | |
579 | run->io.direction, | |
580 | run->io.size, | |
581 | run->io.count); | |
582 | break; | |
583 | case KVM_EXIT_MMIO: | |
584 | dprintf("handle_mmio\n"); | |
585 | cpu_physical_memory_rw(run->mmio.phys_addr, | |
586 | run->mmio.data, | |
587 | run->mmio.len, | |
588 | run->mmio.is_write); | |
589 | ret = 1; | |
590 | break; | |
591 | case KVM_EXIT_IRQ_WINDOW_OPEN: | |
592 | dprintf("irq_window_open\n"); | |
593 | break; | |
594 | case KVM_EXIT_SHUTDOWN: | |
595 | dprintf("shutdown\n"); | |
596 | qemu_system_reset_request(); | |
597 | ret = 1; | |
598 | break; | |
599 | case KVM_EXIT_UNKNOWN: | |
600 | dprintf("kvm_exit_unknown\n"); | |
601 | break; | |
602 | case KVM_EXIT_FAIL_ENTRY: | |
603 | dprintf("kvm_exit_fail_entry\n"); | |
604 | break; | |
605 | case KVM_EXIT_EXCEPTION: | |
606 | dprintf("kvm_exit_exception\n"); | |
607 | break; | |
608 | case KVM_EXIT_DEBUG: | |
609 | dprintf("kvm_exit_debug\n"); | |
e22a25c9 AL |
610 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
611 | if (kvm_arch_debug(&run->debug.arch)) { | |
612 | gdb_set_stop_cpu(env); | |
613 | vm_stop(EXCP_DEBUG); | |
614 | env->exception_index = EXCP_DEBUG; | |
615 | return 0; | |
616 | } | |
617 | /* re-enter, this exception was guest-internal */ | |
618 | ret = 1; | |
619 | #endif /* KVM_CAP_SET_GUEST_DEBUG */ | |
05330448 AL |
620 | break; |
621 | default: | |
622 | dprintf("kvm_arch_handle_exit\n"); | |
623 | ret = kvm_arch_handle_exit(env, run); | |
624 | break; | |
625 | } | |
626 | } while (ret > 0); | |
627 | ||
be214e6c AJ |
628 | if (env->exit_request) { |
629 | env->exit_request = 0; | |
becfc390 AL |
630 | env->exception_index = EXCP_INTERRUPT; |
631 | } | |
632 | ||
05330448 AL |
633 | return ret; |
634 | } | |
635 | ||
636 | void kvm_set_phys_mem(target_phys_addr_t start_addr, | |
637 | ram_addr_t size, | |
638 | ram_addr_t phys_offset) | |
639 | { | |
640 | KVMState *s = kvm_state; | |
641 | ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; | |
6152e2ae AL |
642 | KVMSlot *mem, old; |
643 | int err; | |
05330448 | 644 | |
d3f8d37f | 645 | if (start_addr & ~TARGET_PAGE_MASK) { |
e6f4afe0 JK |
646 | if (flags >= IO_MEM_UNASSIGNED) { |
647 | if (!kvm_lookup_overlapping_slot(s, start_addr, | |
648 | start_addr + size)) { | |
649 | return; | |
650 | } | |
651 | fprintf(stderr, "Unaligned split of a KVM memory slot\n"); | |
652 | } else { | |
653 | fprintf(stderr, "Only page-aligned memory slots supported\n"); | |
654 | } | |
d3f8d37f AL |
655 | abort(); |
656 | } | |
657 | ||
05330448 AL |
658 | /* KVM does not support read-only slots */ |
659 | phys_offset &= ~IO_MEM_ROM; | |
660 | ||
6152e2ae AL |
661 | while (1) { |
662 | mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size); | |
663 | if (!mem) { | |
664 | break; | |
665 | } | |
62d60e8c | 666 | |
6152e2ae AL |
667 | if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr && |
668 | (start_addr + size <= mem->start_addr + mem->memory_size) && | |
669 | (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) { | |
670 | /* The new slot fits into the existing one and comes with | |
671 | * identical parameters - nothing to be done. */ | |
05330448 | 672 | return; |
6152e2ae AL |
673 | } |
674 | ||
675 | old = *mem; | |
676 | ||
677 | /* unregister the overlapping slot */ | |
678 | mem->memory_size = 0; | |
679 | err = kvm_set_user_memory_region(s, mem); | |
680 | if (err) { | |
681 | fprintf(stderr, "%s: error unregistering overlapping slot: %s\n", | |
682 | __func__, strerror(-err)); | |
62d60e8c AL |
683 | abort(); |
684 | } | |
6152e2ae AL |
685 | |
686 | /* Workaround for older KVM versions: we can't join slots, even not by | |
687 | * unregistering the previous ones and then registering the larger | |
688 | * slot. We have to maintain the existing fragmentation. Sigh. | |
689 | * | |
690 | * This workaround assumes that the new slot starts at the same | |
691 | * address as the first existing one. If not or if some overlapping | |
692 | * slot comes around later, we will fail (not seen in practice so far) | |
693 | * - and actually require a recent KVM version. */ | |
e69917e2 JK |
694 | if (s->broken_set_mem_region && |
695 | old.start_addr == start_addr && old.memory_size < size && | |
6152e2ae AL |
696 | flags < IO_MEM_UNASSIGNED) { |
697 | mem = kvm_alloc_slot(s); | |
698 | mem->memory_size = old.memory_size; | |
699 | mem->start_addr = old.start_addr; | |
700 | mem->phys_offset = old.phys_offset; | |
701 | mem->flags = 0; | |
702 | ||
703 | err = kvm_set_user_memory_region(s, mem); | |
704 | if (err) { | |
705 | fprintf(stderr, "%s: error updating slot: %s\n", __func__, | |
706 | strerror(-err)); | |
707 | abort(); | |
708 | } | |
709 | ||
710 | start_addr += old.memory_size; | |
711 | phys_offset += old.memory_size; | |
712 | size -= old.memory_size; | |
713 | continue; | |
714 | } | |
715 | ||
716 | /* register prefix slot */ | |
717 | if (old.start_addr < start_addr) { | |
718 | mem = kvm_alloc_slot(s); | |
719 | mem->memory_size = start_addr - old.start_addr; | |
720 | mem->start_addr = old.start_addr; | |
721 | mem->phys_offset = old.phys_offset; | |
722 | mem->flags = 0; | |
723 | ||
724 | err = kvm_set_user_memory_region(s, mem); | |
725 | if (err) { | |
726 | fprintf(stderr, "%s: error registering prefix slot: %s\n", | |
727 | __func__, strerror(-err)); | |
728 | abort(); | |
729 | } | |
730 | } | |
731 | ||
732 | /* register suffix slot */ | |
733 | if (old.start_addr + old.memory_size > start_addr + size) { | |
734 | ram_addr_t size_delta; | |
735 | ||
736 | mem = kvm_alloc_slot(s); | |
737 | mem->start_addr = start_addr + size; | |
738 | size_delta = mem->start_addr - old.start_addr; | |
739 | mem->memory_size = old.memory_size - size_delta; | |
740 | mem->phys_offset = old.phys_offset + size_delta; | |
741 | mem->flags = 0; | |
742 | ||
743 | err = kvm_set_user_memory_region(s, mem); | |
744 | if (err) { | |
745 | fprintf(stderr, "%s: error registering suffix slot: %s\n", | |
746 | __func__, strerror(-err)); | |
747 | abort(); | |
748 | } | |
749 | } | |
05330448 | 750 | } |
6152e2ae AL |
751 | |
752 | /* in case the KVM bug workaround already "consumed" the new slot */ | |
753 | if (!size) | |
754 | return; | |
755 | ||
05330448 AL |
756 | /* KVM does not need to know about this memory */ |
757 | if (flags >= IO_MEM_UNASSIGNED) | |
758 | return; | |
759 | ||
760 | mem = kvm_alloc_slot(s); | |
761 | mem->memory_size = size; | |
34fc643f AL |
762 | mem->start_addr = start_addr; |
763 | mem->phys_offset = phys_offset; | |
05330448 AL |
764 | mem->flags = 0; |
765 | ||
6152e2ae AL |
766 | err = kvm_set_user_memory_region(s, mem); |
767 | if (err) { | |
768 | fprintf(stderr, "%s: error registering slot: %s\n", __func__, | |
769 | strerror(-err)); | |
770 | abort(); | |
771 | } | |
05330448 AL |
772 | } |
773 | ||
984b5181 | 774 | int kvm_ioctl(KVMState *s, int type, ...) |
05330448 AL |
775 | { |
776 | int ret; | |
984b5181 AL |
777 | void *arg; |
778 | va_list ap; | |
05330448 | 779 | |
984b5181 AL |
780 | va_start(ap, type); |
781 | arg = va_arg(ap, void *); | |
782 | va_end(ap); | |
783 | ||
784 | ret = ioctl(s->fd, type, arg); | |
05330448 AL |
785 | if (ret == -1) |
786 | ret = -errno; | |
787 | ||
788 | return ret; | |
789 | } | |
790 | ||
984b5181 | 791 | int kvm_vm_ioctl(KVMState *s, int type, ...) |
05330448 AL |
792 | { |
793 | int ret; | |
984b5181 AL |
794 | void *arg; |
795 | va_list ap; | |
796 | ||
797 | va_start(ap, type); | |
798 | arg = va_arg(ap, void *); | |
799 | va_end(ap); | |
05330448 | 800 | |
984b5181 | 801 | ret = ioctl(s->vmfd, type, arg); |
05330448 AL |
802 | if (ret == -1) |
803 | ret = -errno; | |
804 | ||
805 | return ret; | |
806 | } | |
807 | ||
984b5181 | 808 | int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
05330448 AL |
809 | { |
810 | int ret; | |
984b5181 AL |
811 | void *arg; |
812 | va_list ap; | |
813 | ||
814 | va_start(ap, type); | |
815 | arg = va_arg(ap, void *); | |
816 | va_end(ap); | |
05330448 | 817 | |
984b5181 | 818 | ret = ioctl(env->kvm_fd, type, arg); |
05330448 AL |
819 | if (ret == -1) |
820 | ret = -errno; | |
821 | ||
822 | return ret; | |
823 | } | |
bd322087 AL |
824 | |
825 | int kvm_has_sync_mmu(void) | |
826 | { | |
a9c11522 | 827 | #ifdef KVM_CAP_SYNC_MMU |
bd322087 AL |
828 | KVMState *s = kvm_state; |
829 | ||
ad7b8b33 AL |
830 | return kvm_check_extension(s, KVM_CAP_SYNC_MMU); |
831 | #else | |
bd322087 | 832 | return 0; |
ad7b8b33 | 833 | #endif |
bd322087 | 834 | } |
e22a25c9 | 835 | |
6f0437e8 JK |
836 | void kvm_setup_guest_memory(void *start, size_t size) |
837 | { | |
838 | if (!kvm_has_sync_mmu()) { | |
839 | #ifdef MADV_DONTFORK | |
840 | int ret = madvise(start, size, MADV_DONTFORK); | |
841 | ||
842 | if (ret) { | |
843 | perror("madvice"); | |
844 | exit(1); | |
845 | } | |
846 | #else | |
847 | fprintf(stderr, | |
848 | "Need MADV_DONTFORK in absence of synchronous KVM MMU\n"); | |
849 | exit(1); | |
850 | #endif | |
851 | } | |
852 | } | |
853 | ||
e22a25c9 AL |
854 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
855 | struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env, | |
856 | target_ulong pc) | |
857 | { | |
858 | struct kvm_sw_breakpoint *bp; | |
859 | ||
860 | TAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) { | |
861 | if (bp->pc == pc) | |
862 | return bp; | |
863 | } | |
864 | return NULL; | |
865 | } | |
866 | ||
867 | int kvm_sw_breakpoints_active(CPUState *env) | |
868 | { | |
869 | return !TAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints); | |
870 | } | |
871 | ||
872 | int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) | |
873 | { | |
874 | struct kvm_guest_debug dbg; | |
875 | ||
876 | dbg.control = 0; | |
877 | if (env->singlestep_enabled) | |
878 | dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; | |
879 | ||
880 | kvm_arch_update_guest_debug(env, &dbg); | |
881 | dbg.control |= reinject_trap; | |
882 | ||
883 | return kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg); | |
884 | } | |
885 | ||
886 | int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, | |
887 | target_ulong len, int type) | |
888 | { | |
889 | struct kvm_sw_breakpoint *bp; | |
890 | CPUState *env; | |
891 | int err; | |
892 | ||
893 | if (type == GDB_BREAKPOINT_SW) { | |
894 | bp = kvm_find_sw_breakpoint(current_env, addr); | |
895 | if (bp) { | |
896 | bp->use_count++; | |
897 | return 0; | |
898 | } | |
899 | ||
900 | bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint)); | |
901 | if (!bp) | |
902 | return -ENOMEM; | |
903 | ||
904 | bp->pc = addr; | |
905 | bp->use_count = 1; | |
906 | err = kvm_arch_insert_sw_breakpoint(current_env, bp); | |
907 | if (err) { | |
908 | free(bp); | |
909 | return err; | |
910 | } | |
911 | ||
912 | TAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints, | |
913 | bp, entry); | |
914 | } else { | |
915 | err = kvm_arch_insert_hw_breakpoint(addr, len, type); | |
916 | if (err) | |
917 | return err; | |
918 | } | |
919 | ||
920 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
921 | err = kvm_update_guest_debug(env, 0); | |
922 | if (err) | |
923 | return err; | |
924 | } | |
925 | return 0; | |
926 | } | |
927 | ||
928 | int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, | |
929 | target_ulong len, int type) | |
930 | { | |
931 | struct kvm_sw_breakpoint *bp; | |
932 | CPUState *env; | |
933 | int err; | |
934 | ||
935 | if (type == GDB_BREAKPOINT_SW) { | |
936 | bp = kvm_find_sw_breakpoint(current_env, addr); | |
937 | if (!bp) | |
938 | return -ENOENT; | |
939 | ||
940 | if (bp->use_count > 1) { | |
941 | bp->use_count--; | |
942 | return 0; | |
943 | } | |
944 | ||
945 | err = kvm_arch_remove_sw_breakpoint(current_env, bp); | |
946 | if (err) | |
947 | return err; | |
948 | ||
949 | TAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry); | |
950 | qemu_free(bp); | |
951 | } else { | |
952 | err = kvm_arch_remove_hw_breakpoint(addr, len, type); | |
953 | if (err) | |
954 | return err; | |
955 | } | |
956 | ||
957 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
958 | err = kvm_update_guest_debug(env, 0); | |
959 | if (err) | |
960 | return err; | |
961 | } | |
962 | return 0; | |
963 | } | |
964 | ||
965 | void kvm_remove_all_breakpoints(CPUState *current_env) | |
966 | { | |
967 | struct kvm_sw_breakpoint *bp, *next; | |
968 | KVMState *s = current_env->kvm_state; | |
969 | CPUState *env; | |
970 | ||
971 | TAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { | |
972 | if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) { | |
973 | /* Try harder to find a CPU that currently sees the breakpoint. */ | |
974 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
975 | if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) | |
976 | break; | |
977 | } | |
978 | } | |
979 | } | |
980 | kvm_arch_remove_all_hw_breakpoints(); | |
981 | ||
982 | for (env = first_cpu; env != NULL; env = env->next_cpu) | |
983 | kvm_update_guest_debug(env, 0); | |
984 | } | |
985 | ||
986 | #else /* !KVM_CAP_SET_GUEST_DEBUG */ | |
987 | ||
988 | int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) | |
989 | { | |
990 | return -EINVAL; | |
991 | } | |
992 | ||
993 | int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, | |
994 | target_ulong len, int type) | |
995 | { | |
996 | return -EINVAL; | |
997 | } | |
998 | ||
999 | int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, | |
1000 | target_ulong len, int type) | |
1001 | { | |
1002 | return -EINVAL; | |
1003 | } | |
1004 | ||
1005 | void kvm_remove_all_breakpoints(CPUState *current_env) | |
1006 | { | |
1007 | } | |
1008 | #endif /* !KVM_CAP_SET_GUEST_DEBUG */ |