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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 | */ | |
d3f8d37f AL |
275 | void 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; | |
279 | KVMDirtyLog d; | |
d3f8d37f | 280 | KVMSlot *mem = kvm_lookup_matching_slot(s, start_addr, end_addr); |
5832d1f2 AL |
281 | unsigned long alloc_size; |
282 | ram_addr_t addr; | |
283 | target_phys_addr_t phys_addr = start_addr; | |
284 | ||
d3f8d37f AL |
285 | dprintf("sync addr: " TARGET_FMT_lx " into %lx\n", start_addr, |
286 | mem->phys_offset); | |
5832d1f2 | 287 | if (mem == NULL) { |
d3f8d37f AL |
288 | fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-" |
289 | TARGET_FMT_plx "\n", __func__, phys_addr, end_addr - 1); | |
5832d1f2 AL |
290 | return; |
291 | } | |
292 | ||
62518b8b | 293 | alloc_size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8; |
5832d1f2 AL |
294 | d.dirty_bitmap = qemu_mallocz(alloc_size); |
295 | ||
5832d1f2 AL |
296 | d.slot = mem->slot; |
297 | dprintf("slot %d, phys_addr %llx, uaddr: %llx\n", | |
298 | d.slot, mem->start_addr, mem->phys_offset); | |
299 | ||
300 | if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) { | |
301 | dprintf("ioctl failed %d\n", errno); | |
302 | goto out; | |
303 | } | |
304 | ||
305 | phys_addr = start_addr; | |
306 | for (addr = mem->phys_offset; phys_addr < end_addr; phys_addr+= TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) { | |
307 | unsigned long *bitmap = (unsigned long *)d.dirty_bitmap; | |
308 | unsigned nr = (phys_addr - start_addr) >> TARGET_PAGE_BITS; | |
309 | unsigned word = nr / (sizeof(*bitmap) * 8); | |
310 | unsigned bit = nr % (sizeof(*bitmap) * 8); | |
311 | if ((bitmap[word] >> bit) & 1) | |
312 | cpu_physical_memory_set_dirty(addr); | |
313 | } | |
314 | out: | |
315 | qemu_free(d.dirty_bitmap); | |
316 | } | |
317 | ||
f65ed4c1 AL |
318 | int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) |
319 | { | |
320 | int ret = -ENOSYS; | |
321 | #ifdef KVM_CAP_COALESCED_MMIO | |
322 | KVMState *s = kvm_state; | |
323 | ||
324 | if (s->coalesced_mmio) { | |
325 | struct kvm_coalesced_mmio_zone zone; | |
326 | ||
327 | zone.addr = start; | |
328 | zone.size = size; | |
329 | ||
330 | ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); | |
331 | } | |
332 | #endif | |
333 | ||
334 | return ret; | |
335 | } | |
336 | ||
337 | int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) | |
338 | { | |
339 | int ret = -ENOSYS; | |
340 | #ifdef KVM_CAP_COALESCED_MMIO | |
341 | KVMState *s = kvm_state; | |
342 | ||
343 | if (s->coalesced_mmio) { | |
344 | struct kvm_coalesced_mmio_zone zone; | |
345 | ||
346 | zone.addr = start; | |
347 | zone.size = size; | |
348 | ||
349 | ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); | |
350 | } | |
351 | #endif | |
352 | ||
353 | return ret; | |
354 | } | |
355 | ||
ad7b8b33 AL |
356 | int kvm_check_extension(KVMState *s, unsigned int extension) |
357 | { | |
358 | int ret; | |
359 | ||
360 | ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension); | |
361 | if (ret < 0) { | |
362 | ret = 0; | |
363 | } | |
364 | ||
365 | return ret; | |
366 | } | |
367 | ||
05330448 AL |
368 | int kvm_init(int smp_cpus) |
369 | { | |
370 | KVMState *s; | |
371 | int ret; | |
372 | int i; | |
373 | ||
9f8fd694 MM |
374 | if (smp_cpus > 1) { |
375 | fprintf(stderr, "No SMP KVM support, use '-smp 1'\n"); | |
05330448 | 376 | return -EINVAL; |
9f8fd694 | 377 | } |
05330448 AL |
378 | |
379 | s = qemu_mallocz(sizeof(KVMState)); | |
05330448 | 380 | |
e22a25c9 AL |
381 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
382 | TAILQ_INIT(&s->kvm_sw_breakpoints); | |
383 | #endif | |
05330448 AL |
384 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
385 | s->slots[i].slot = i; | |
386 | ||
387 | s->vmfd = -1; | |
388 | s->fd = open("/dev/kvm", O_RDWR); | |
389 | if (s->fd == -1) { | |
390 | fprintf(stderr, "Could not access KVM kernel module: %m\n"); | |
391 | ret = -errno; | |
392 | goto err; | |
393 | } | |
394 | ||
395 | ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0); | |
396 | if (ret < KVM_API_VERSION) { | |
397 | if (ret > 0) | |
398 | ret = -EINVAL; | |
399 | fprintf(stderr, "kvm version too old\n"); | |
400 | goto err; | |
401 | } | |
402 | ||
403 | if (ret > KVM_API_VERSION) { | |
404 | ret = -EINVAL; | |
405 | fprintf(stderr, "kvm version not supported\n"); | |
406 | goto err; | |
407 | } | |
408 | ||
409 | s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0); | |
410 | if (s->vmfd < 0) | |
411 | goto err; | |
412 | ||
413 | /* initially, KVM allocated its own memory and we had to jump through | |
414 | * hooks to make phys_ram_base point to this. Modern versions of KVM | |
5579c7f3 | 415 | * just use a user allocated buffer so we can use regular pages |
05330448 AL |
416 | * unmodified. Make sure we have a sufficiently modern version of KVM. |
417 | */ | |
ad7b8b33 AL |
418 | if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) { |
419 | ret = -EINVAL; | |
05330448 AL |
420 | fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n"); |
421 | goto err; | |
422 | } | |
423 | ||
d85dc283 AL |
424 | /* There was a nasty bug in < kvm-80 that prevents memory slots from being |
425 | * destroyed properly. Since we rely on this capability, refuse to work | |
426 | * with any kernel without this capability. */ | |
ad7b8b33 AL |
427 | if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) { |
428 | ret = -EINVAL; | |
d85dc283 AL |
429 | |
430 | fprintf(stderr, | |
431 | "KVM kernel module broken (DESTROY_MEMORY_REGION)\n" | |
432 | "Please upgrade to at least kvm-81.\n"); | |
433 | goto err; | |
434 | } | |
435 | ||
f65ed4c1 | 436 | #ifdef KVM_CAP_COALESCED_MMIO |
ad7b8b33 AL |
437 | s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); |
438 | #else | |
439 | s->coalesced_mmio = 0; | |
f65ed4c1 AL |
440 | #endif |
441 | ||
e69917e2 JK |
442 | s->broken_set_mem_region = 1; |
443 | #ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS | |
444 | ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS); | |
445 | if (ret > 0) { | |
446 | s->broken_set_mem_region = 0; | |
447 | } | |
448 | #endif | |
449 | ||
05330448 AL |
450 | ret = kvm_arch_init(s, smp_cpus); |
451 | if (ret < 0) | |
452 | goto err; | |
453 | ||
454 | kvm_state = s; | |
455 | ||
456 | return 0; | |
457 | ||
458 | err: | |
459 | if (s) { | |
460 | if (s->vmfd != -1) | |
461 | close(s->vmfd); | |
462 | if (s->fd != -1) | |
463 | close(s->fd); | |
464 | } | |
465 | qemu_free(s); | |
466 | ||
467 | return ret; | |
468 | } | |
469 | ||
470 | static int kvm_handle_io(CPUState *env, uint16_t port, void *data, | |
471 | int direction, int size, uint32_t count) | |
472 | { | |
473 | int i; | |
474 | uint8_t *ptr = data; | |
475 | ||
476 | for (i = 0; i < count; i++) { | |
477 | if (direction == KVM_EXIT_IO_IN) { | |
478 | switch (size) { | |
479 | case 1: | |
480 | stb_p(ptr, cpu_inb(env, port)); | |
481 | break; | |
482 | case 2: | |
483 | stw_p(ptr, cpu_inw(env, port)); | |
484 | break; | |
485 | case 4: | |
486 | stl_p(ptr, cpu_inl(env, port)); | |
487 | break; | |
488 | } | |
489 | } else { | |
490 | switch (size) { | |
491 | case 1: | |
492 | cpu_outb(env, port, ldub_p(ptr)); | |
493 | break; | |
494 | case 2: | |
495 | cpu_outw(env, port, lduw_p(ptr)); | |
496 | break; | |
497 | case 4: | |
498 | cpu_outl(env, port, ldl_p(ptr)); | |
499 | break; | |
500 | } | |
501 | } | |
502 | ||
503 | ptr += size; | |
504 | } | |
505 | ||
506 | return 1; | |
507 | } | |
508 | ||
f65ed4c1 AL |
509 | static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run) |
510 | { | |
511 | #ifdef KVM_CAP_COALESCED_MMIO | |
512 | KVMState *s = kvm_state; | |
513 | if (s->coalesced_mmio) { | |
514 | struct kvm_coalesced_mmio_ring *ring; | |
515 | ||
516 | ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE); | |
517 | while (ring->first != ring->last) { | |
518 | struct kvm_coalesced_mmio *ent; | |
519 | ||
520 | ent = &ring->coalesced_mmio[ring->first]; | |
521 | ||
522 | cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); | |
523 | /* FIXME smp_wmb() */ | |
524 | ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX; | |
525 | } | |
526 | } | |
527 | #endif | |
528 | } | |
529 | ||
05330448 AL |
530 | int kvm_cpu_exec(CPUState *env) |
531 | { | |
532 | struct kvm_run *run = env->kvm_run; | |
533 | int ret; | |
534 | ||
535 | dprintf("kvm_cpu_exec()\n"); | |
536 | ||
537 | do { | |
538 | kvm_arch_pre_run(env, run); | |
539 | ||
be214e6c | 540 | if (env->exit_request) { |
05330448 AL |
541 | dprintf("interrupt exit requested\n"); |
542 | ret = 0; | |
543 | break; | |
544 | } | |
545 | ||
546 | ret = kvm_vcpu_ioctl(env, KVM_RUN, 0); | |
547 | kvm_arch_post_run(env, run); | |
548 | ||
549 | if (ret == -EINTR || ret == -EAGAIN) { | |
550 | dprintf("io window exit\n"); | |
551 | ret = 0; | |
552 | break; | |
553 | } | |
554 | ||
555 | if (ret < 0) { | |
556 | dprintf("kvm run failed %s\n", strerror(-ret)); | |
557 | abort(); | |
558 | } | |
559 | ||
f65ed4c1 AL |
560 | kvm_run_coalesced_mmio(env, run); |
561 | ||
05330448 AL |
562 | ret = 0; /* exit loop */ |
563 | switch (run->exit_reason) { | |
564 | case KVM_EXIT_IO: | |
565 | dprintf("handle_io\n"); | |
566 | ret = kvm_handle_io(env, run->io.port, | |
567 | (uint8_t *)run + run->io.data_offset, | |
568 | run->io.direction, | |
569 | run->io.size, | |
570 | run->io.count); | |
571 | break; | |
572 | case KVM_EXIT_MMIO: | |
573 | dprintf("handle_mmio\n"); | |
574 | cpu_physical_memory_rw(run->mmio.phys_addr, | |
575 | run->mmio.data, | |
576 | run->mmio.len, | |
577 | run->mmio.is_write); | |
578 | ret = 1; | |
579 | break; | |
580 | case KVM_EXIT_IRQ_WINDOW_OPEN: | |
581 | dprintf("irq_window_open\n"); | |
582 | break; | |
583 | case KVM_EXIT_SHUTDOWN: | |
584 | dprintf("shutdown\n"); | |
585 | qemu_system_reset_request(); | |
586 | ret = 1; | |
587 | break; | |
588 | case KVM_EXIT_UNKNOWN: | |
589 | dprintf("kvm_exit_unknown\n"); | |
590 | break; | |
591 | case KVM_EXIT_FAIL_ENTRY: | |
592 | dprintf("kvm_exit_fail_entry\n"); | |
593 | break; | |
594 | case KVM_EXIT_EXCEPTION: | |
595 | dprintf("kvm_exit_exception\n"); | |
596 | break; | |
597 | case KVM_EXIT_DEBUG: | |
598 | dprintf("kvm_exit_debug\n"); | |
e22a25c9 AL |
599 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
600 | if (kvm_arch_debug(&run->debug.arch)) { | |
601 | gdb_set_stop_cpu(env); | |
602 | vm_stop(EXCP_DEBUG); | |
603 | env->exception_index = EXCP_DEBUG; | |
604 | return 0; | |
605 | } | |
606 | /* re-enter, this exception was guest-internal */ | |
607 | ret = 1; | |
608 | #endif /* KVM_CAP_SET_GUEST_DEBUG */ | |
05330448 AL |
609 | break; |
610 | default: | |
611 | dprintf("kvm_arch_handle_exit\n"); | |
612 | ret = kvm_arch_handle_exit(env, run); | |
613 | break; | |
614 | } | |
615 | } while (ret > 0); | |
616 | ||
be214e6c AJ |
617 | if (env->exit_request) { |
618 | env->exit_request = 0; | |
becfc390 AL |
619 | env->exception_index = EXCP_INTERRUPT; |
620 | } | |
621 | ||
05330448 AL |
622 | return ret; |
623 | } | |
624 | ||
625 | void kvm_set_phys_mem(target_phys_addr_t start_addr, | |
626 | ram_addr_t size, | |
627 | ram_addr_t phys_offset) | |
628 | { | |
629 | KVMState *s = kvm_state; | |
630 | ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; | |
6152e2ae AL |
631 | KVMSlot *mem, old; |
632 | int err; | |
05330448 | 633 | |
d3f8d37f | 634 | if (start_addr & ~TARGET_PAGE_MASK) { |
e6f4afe0 JK |
635 | if (flags >= IO_MEM_UNASSIGNED) { |
636 | if (!kvm_lookup_overlapping_slot(s, start_addr, | |
637 | start_addr + size)) { | |
638 | return; | |
639 | } | |
640 | fprintf(stderr, "Unaligned split of a KVM memory slot\n"); | |
641 | } else { | |
642 | fprintf(stderr, "Only page-aligned memory slots supported\n"); | |
643 | } | |
d3f8d37f AL |
644 | abort(); |
645 | } | |
646 | ||
05330448 AL |
647 | /* KVM does not support read-only slots */ |
648 | phys_offset &= ~IO_MEM_ROM; | |
649 | ||
6152e2ae AL |
650 | while (1) { |
651 | mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size); | |
652 | if (!mem) { | |
653 | break; | |
654 | } | |
62d60e8c | 655 | |
6152e2ae AL |
656 | if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr && |
657 | (start_addr + size <= mem->start_addr + mem->memory_size) && | |
658 | (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) { | |
659 | /* The new slot fits into the existing one and comes with | |
660 | * identical parameters - nothing to be done. */ | |
05330448 | 661 | return; |
6152e2ae AL |
662 | } |
663 | ||
664 | old = *mem; | |
665 | ||
666 | /* unregister the overlapping slot */ | |
667 | mem->memory_size = 0; | |
668 | err = kvm_set_user_memory_region(s, mem); | |
669 | if (err) { | |
670 | fprintf(stderr, "%s: error unregistering overlapping slot: %s\n", | |
671 | __func__, strerror(-err)); | |
62d60e8c AL |
672 | abort(); |
673 | } | |
6152e2ae AL |
674 | |
675 | /* Workaround for older KVM versions: we can't join slots, even not by | |
676 | * unregistering the previous ones and then registering the larger | |
677 | * slot. We have to maintain the existing fragmentation. Sigh. | |
678 | * | |
679 | * This workaround assumes that the new slot starts at the same | |
680 | * address as the first existing one. If not or if some overlapping | |
681 | * slot comes around later, we will fail (not seen in practice so far) | |
682 | * - and actually require a recent KVM version. */ | |
e69917e2 JK |
683 | if (s->broken_set_mem_region && |
684 | old.start_addr == start_addr && old.memory_size < size && | |
6152e2ae AL |
685 | flags < IO_MEM_UNASSIGNED) { |
686 | mem = kvm_alloc_slot(s); | |
687 | mem->memory_size = old.memory_size; | |
688 | mem->start_addr = old.start_addr; | |
689 | mem->phys_offset = old.phys_offset; | |
690 | mem->flags = 0; | |
691 | ||
692 | err = kvm_set_user_memory_region(s, mem); | |
693 | if (err) { | |
694 | fprintf(stderr, "%s: error updating slot: %s\n", __func__, | |
695 | strerror(-err)); | |
696 | abort(); | |
697 | } | |
698 | ||
699 | start_addr += old.memory_size; | |
700 | phys_offset += old.memory_size; | |
701 | size -= old.memory_size; | |
702 | continue; | |
703 | } | |
704 | ||
705 | /* register prefix slot */ | |
706 | if (old.start_addr < start_addr) { | |
707 | mem = kvm_alloc_slot(s); | |
708 | mem->memory_size = start_addr - old.start_addr; | |
709 | mem->start_addr = old.start_addr; | |
710 | mem->phys_offset = old.phys_offset; | |
711 | mem->flags = 0; | |
712 | ||
713 | err = kvm_set_user_memory_region(s, mem); | |
714 | if (err) { | |
715 | fprintf(stderr, "%s: error registering prefix slot: %s\n", | |
716 | __func__, strerror(-err)); | |
717 | abort(); | |
718 | } | |
719 | } | |
720 | ||
721 | /* register suffix slot */ | |
722 | if (old.start_addr + old.memory_size > start_addr + size) { | |
723 | ram_addr_t size_delta; | |
724 | ||
725 | mem = kvm_alloc_slot(s); | |
726 | mem->start_addr = start_addr + size; | |
727 | size_delta = mem->start_addr - old.start_addr; | |
728 | mem->memory_size = old.memory_size - size_delta; | |
729 | mem->phys_offset = old.phys_offset + size_delta; | |
730 | mem->flags = 0; | |
731 | ||
732 | err = kvm_set_user_memory_region(s, mem); | |
733 | if (err) { | |
734 | fprintf(stderr, "%s: error registering suffix slot: %s\n", | |
735 | __func__, strerror(-err)); | |
736 | abort(); | |
737 | } | |
738 | } | |
05330448 | 739 | } |
6152e2ae AL |
740 | |
741 | /* in case the KVM bug workaround already "consumed" the new slot */ | |
742 | if (!size) | |
743 | return; | |
744 | ||
05330448 AL |
745 | /* KVM does not need to know about this memory */ |
746 | if (flags >= IO_MEM_UNASSIGNED) | |
747 | return; | |
748 | ||
749 | mem = kvm_alloc_slot(s); | |
750 | mem->memory_size = size; | |
34fc643f AL |
751 | mem->start_addr = start_addr; |
752 | mem->phys_offset = phys_offset; | |
05330448 AL |
753 | mem->flags = 0; |
754 | ||
6152e2ae AL |
755 | err = kvm_set_user_memory_region(s, mem); |
756 | if (err) { | |
757 | fprintf(stderr, "%s: error registering slot: %s\n", __func__, | |
758 | strerror(-err)); | |
759 | abort(); | |
760 | } | |
05330448 AL |
761 | } |
762 | ||
984b5181 | 763 | int kvm_ioctl(KVMState *s, int type, ...) |
05330448 AL |
764 | { |
765 | int ret; | |
984b5181 AL |
766 | void *arg; |
767 | va_list ap; | |
05330448 | 768 | |
984b5181 AL |
769 | va_start(ap, type); |
770 | arg = va_arg(ap, void *); | |
771 | va_end(ap); | |
772 | ||
773 | ret = ioctl(s->fd, type, arg); | |
05330448 AL |
774 | if (ret == -1) |
775 | ret = -errno; | |
776 | ||
777 | return ret; | |
778 | } | |
779 | ||
984b5181 | 780 | int kvm_vm_ioctl(KVMState *s, int type, ...) |
05330448 AL |
781 | { |
782 | int ret; | |
984b5181 AL |
783 | void *arg; |
784 | va_list ap; | |
785 | ||
786 | va_start(ap, type); | |
787 | arg = va_arg(ap, void *); | |
788 | va_end(ap); | |
05330448 | 789 | |
984b5181 | 790 | ret = ioctl(s->vmfd, type, arg); |
05330448 AL |
791 | if (ret == -1) |
792 | ret = -errno; | |
793 | ||
794 | return ret; | |
795 | } | |
796 | ||
984b5181 | 797 | int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
05330448 AL |
798 | { |
799 | int ret; | |
984b5181 AL |
800 | void *arg; |
801 | va_list ap; | |
802 | ||
803 | va_start(ap, type); | |
804 | arg = va_arg(ap, void *); | |
805 | va_end(ap); | |
05330448 | 806 | |
984b5181 | 807 | ret = ioctl(env->kvm_fd, type, arg); |
05330448 AL |
808 | if (ret == -1) |
809 | ret = -errno; | |
810 | ||
811 | return ret; | |
812 | } | |
bd322087 AL |
813 | |
814 | int kvm_has_sync_mmu(void) | |
815 | { | |
a9c11522 | 816 | #ifdef KVM_CAP_SYNC_MMU |
bd322087 AL |
817 | KVMState *s = kvm_state; |
818 | ||
ad7b8b33 AL |
819 | return kvm_check_extension(s, KVM_CAP_SYNC_MMU); |
820 | #else | |
bd322087 | 821 | return 0; |
ad7b8b33 | 822 | #endif |
bd322087 | 823 | } |
e22a25c9 | 824 | |
6f0437e8 JK |
825 | void kvm_setup_guest_memory(void *start, size_t size) |
826 | { | |
827 | if (!kvm_has_sync_mmu()) { | |
828 | #ifdef MADV_DONTFORK | |
829 | int ret = madvise(start, size, MADV_DONTFORK); | |
830 | ||
831 | if (ret) { | |
832 | perror("madvice"); | |
833 | exit(1); | |
834 | } | |
835 | #else | |
836 | fprintf(stderr, | |
837 | "Need MADV_DONTFORK in absence of synchronous KVM MMU\n"); | |
838 | exit(1); | |
839 | #endif | |
840 | } | |
841 | } | |
842 | ||
e22a25c9 AL |
843 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
844 | struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env, | |
845 | target_ulong pc) | |
846 | { | |
847 | struct kvm_sw_breakpoint *bp; | |
848 | ||
849 | TAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) { | |
850 | if (bp->pc == pc) | |
851 | return bp; | |
852 | } | |
853 | return NULL; | |
854 | } | |
855 | ||
856 | int kvm_sw_breakpoints_active(CPUState *env) | |
857 | { | |
858 | return !TAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints); | |
859 | } | |
860 | ||
861 | int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) | |
862 | { | |
863 | struct kvm_guest_debug dbg; | |
864 | ||
865 | dbg.control = 0; | |
866 | if (env->singlestep_enabled) | |
867 | dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; | |
868 | ||
869 | kvm_arch_update_guest_debug(env, &dbg); | |
870 | dbg.control |= reinject_trap; | |
871 | ||
872 | return kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg); | |
873 | } | |
874 | ||
875 | int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, | |
876 | target_ulong len, int type) | |
877 | { | |
878 | struct kvm_sw_breakpoint *bp; | |
879 | CPUState *env; | |
880 | int err; | |
881 | ||
882 | if (type == GDB_BREAKPOINT_SW) { | |
883 | bp = kvm_find_sw_breakpoint(current_env, addr); | |
884 | if (bp) { | |
885 | bp->use_count++; | |
886 | return 0; | |
887 | } | |
888 | ||
889 | bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint)); | |
890 | if (!bp) | |
891 | return -ENOMEM; | |
892 | ||
893 | bp->pc = addr; | |
894 | bp->use_count = 1; | |
895 | err = kvm_arch_insert_sw_breakpoint(current_env, bp); | |
896 | if (err) { | |
897 | free(bp); | |
898 | return err; | |
899 | } | |
900 | ||
901 | TAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints, | |
902 | bp, entry); | |
903 | } else { | |
904 | err = kvm_arch_insert_hw_breakpoint(addr, len, type); | |
905 | if (err) | |
906 | return err; | |
907 | } | |
908 | ||
909 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
910 | err = kvm_update_guest_debug(env, 0); | |
911 | if (err) | |
912 | return err; | |
913 | } | |
914 | return 0; | |
915 | } | |
916 | ||
917 | int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, | |
918 | target_ulong len, int type) | |
919 | { | |
920 | struct kvm_sw_breakpoint *bp; | |
921 | CPUState *env; | |
922 | int err; | |
923 | ||
924 | if (type == GDB_BREAKPOINT_SW) { | |
925 | bp = kvm_find_sw_breakpoint(current_env, addr); | |
926 | if (!bp) | |
927 | return -ENOENT; | |
928 | ||
929 | if (bp->use_count > 1) { | |
930 | bp->use_count--; | |
931 | return 0; | |
932 | } | |
933 | ||
934 | err = kvm_arch_remove_sw_breakpoint(current_env, bp); | |
935 | if (err) | |
936 | return err; | |
937 | ||
938 | TAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry); | |
939 | qemu_free(bp); | |
940 | } else { | |
941 | err = kvm_arch_remove_hw_breakpoint(addr, len, type); | |
942 | if (err) | |
943 | return err; | |
944 | } | |
945 | ||
946 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
947 | err = kvm_update_guest_debug(env, 0); | |
948 | if (err) | |
949 | return err; | |
950 | } | |
951 | return 0; | |
952 | } | |
953 | ||
954 | void kvm_remove_all_breakpoints(CPUState *current_env) | |
955 | { | |
956 | struct kvm_sw_breakpoint *bp, *next; | |
957 | KVMState *s = current_env->kvm_state; | |
958 | CPUState *env; | |
959 | ||
960 | TAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { | |
961 | if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) { | |
962 | /* Try harder to find a CPU that currently sees the breakpoint. */ | |
963 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
964 | if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) | |
965 | break; | |
966 | } | |
967 | } | |
968 | } | |
969 | kvm_arch_remove_all_hw_breakpoints(); | |
970 | ||
971 | for (env = first_cpu; env != NULL; env = env->next_cpu) | |
972 | kvm_update_guest_debug(env, 0); | |
973 | } | |
974 | ||
975 | #else /* !KVM_CAP_SET_GUEST_DEBUG */ | |
976 | ||
977 | int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) | |
978 | { | |
979 | return -EINVAL; | |
980 | } | |
981 | ||
982 | int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, | |
983 | target_ulong len, int type) | |
984 | { | |
985 | return -EINVAL; | |
986 | } | |
987 | ||
988 | int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, | |
989 | target_ulong len, int type) | |
990 | { | |
991 | return -EINVAL; | |
992 | } | |
993 | ||
994 | void kvm_remove_all_breakpoints(CPUState *current_env) | |
995 | { | |
996 | } | |
997 | #endif /* !KVM_CAP_SET_GUEST_DEBUG */ |