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05330448 AL |
1 | /* |
2 | * QEMU KVM support | |
3 | * | |
4 | * Copyright IBM, Corp. 2008 | |
5832d1f2 | 5 | * Red Hat, Inc. 2008 |
05330448 AL |
6 | * |
7 | * Authors: | |
8 | * Anthony Liguori <aliguori@us.ibm.com> | |
5832d1f2 | 9 | * Glauber Costa <gcosta@redhat.com> |
05330448 AL |
10 | * |
11 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
12 | * See the COPYING file in the top-level directory. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <sys/types.h> | |
17 | #include <sys/ioctl.h> | |
18 | #include <sys/mman.h> | |
984b5181 | 19 | #include <stdarg.h> |
05330448 AL |
20 | |
21 | #include <linux/kvm.h> | |
22 | ||
23 | #include "qemu-common.h" | |
24 | #include "sysemu.h" | |
d33a1810 | 25 | #include "hw/hw.h" |
e22a25c9 | 26 | #include "gdbstub.h" |
05330448 AL |
27 | #include "kvm.h" |
28 | ||
f65ed4c1 AL |
29 | /* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */ |
30 | #define PAGE_SIZE TARGET_PAGE_SIZE | |
31 | ||
05330448 AL |
32 | //#define DEBUG_KVM |
33 | ||
34 | #ifdef DEBUG_KVM | |
35 | #define dprintf(fmt, ...) \ | |
36 | do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) | |
37 | #else | |
38 | #define dprintf(fmt, ...) \ | |
39 | do { } while (0) | |
40 | #endif | |
41 | ||
34fc643f AL |
42 | typedef struct KVMSlot |
43 | { | |
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 | |
05330448 AL |
156 | int kvm_init_vcpu(CPUState *env) |
157 | { | |
158 | KVMState *s = kvm_state; | |
159 | long mmap_size; | |
160 | int ret; | |
161 | ||
162 | dprintf("kvm_init_vcpu\n"); | |
163 | ||
984b5181 | 164 | ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index); |
05330448 AL |
165 | if (ret < 0) { |
166 | dprintf("kvm_create_vcpu failed\n"); | |
167 | goto err; | |
168 | } | |
169 | ||
170 | env->kvm_fd = ret; | |
171 | env->kvm_state = s; | |
172 | ||
173 | mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0); | |
174 | if (mmap_size < 0) { | |
175 | dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n"); | |
176 | goto err; | |
177 | } | |
178 | ||
179 | env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, | |
180 | env->kvm_fd, 0); | |
181 | if (env->kvm_run == MAP_FAILED) { | |
182 | ret = -errno; | |
183 | dprintf("mmap'ing vcpu state failed\n"); | |
184 | goto err; | |
185 | } | |
186 | ||
187 | ret = kvm_arch_init_vcpu(env); | |
8d2ba1fb | 188 | if (ret == 0) { |
a08d4367 | 189 | qemu_register_reset(kvm_reset_vcpu, env); |
8d2ba1fb JK |
190 | ret = kvm_arch_put_registers(env); |
191 | } | |
05330448 AL |
192 | err: |
193 | return ret; | |
194 | } | |
195 | ||
5832d1f2 AL |
196 | /* |
197 | * dirty pages logging control | |
198 | */ | |
d3f8d37f | 199 | static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr, |
4495d6a7 | 200 | ram_addr_t size, int flags, int mask) |
5832d1f2 AL |
201 | { |
202 | KVMState *s = kvm_state; | |
d3f8d37f | 203 | KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size); |
4495d6a7 JK |
204 | int old_flags; |
205 | ||
5832d1f2 | 206 | if (mem == NULL) { |
d3f8d37f AL |
207 | fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-" |
208 | TARGET_FMT_plx "\n", __func__, phys_addr, | |
209 | phys_addr + size - 1); | |
5832d1f2 AL |
210 | return -EINVAL; |
211 | } | |
212 | ||
4495d6a7 | 213 | old_flags = mem->flags; |
5832d1f2 | 214 | |
4495d6a7 | 215 | flags = (mem->flags & ~mask) | flags; |
5832d1f2 AL |
216 | mem->flags = flags; |
217 | ||
4495d6a7 JK |
218 | /* If nothing changed effectively, no need to issue ioctl */ |
219 | if (s->migration_log) { | |
220 | flags |= KVM_MEM_LOG_DIRTY_PAGES; | |
221 | } | |
222 | if (flags == old_flags) { | |
223 | return 0; | |
224 | } | |
225 | ||
5832d1f2 AL |
226 | return kvm_set_user_memory_region(s, mem); |
227 | } | |
228 | ||
d3f8d37f | 229 | int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size) |
5832d1f2 | 230 | { |
d3f8d37f | 231 | return kvm_dirty_pages_log_change(phys_addr, size, |
5832d1f2 AL |
232 | KVM_MEM_LOG_DIRTY_PAGES, |
233 | KVM_MEM_LOG_DIRTY_PAGES); | |
234 | } | |
235 | ||
d3f8d37f | 236 | int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size) |
5832d1f2 | 237 | { |
d3f8d37f | 238 | return kvm_dirty_pages_log_change(phys_addr, size, |
5832d1f2 AL |
239 | 0, |
240 | KVM_MEM_LOG_DIRTY_PAGES); | |
241 | } | |
242 | ||
4495d6a7 JK |
243 | int kvm_set_migration_log(int enable) |
244 | { | |
245 | KVMState *s = kvm_state; | |
246 | KVMSlot *mem; | |
247 | int i, err; | |
248 | ||
249 | s->migration_log = enable; | |
250 | ||
251 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) { | |
252 | mem = &s->slots[i]; | |
253 | ||
254 | if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) { | |
255 | continue; | |
256 | } | |
257 | err = kvm_set_user_memory_region(s, mem); | |
258 | if (err) { | |
259 | return err; | |
260 | } | |
261 | } | |
262 | return 0; | |
263 | } | |
264 | ||
5832d1f2 AL |
265 | /** |
266 | * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space | |
267 | * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty(). | |
268 | * This means all bits are set to dirty. | |
269 | * | |
d3f8d37f | 270 | * @start_add: start of logged region. |
5832d1f2 AL |
271 | * @end_addr: end of logged region. |
272 | */ | |
151f7749 JK |
273 | int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, |
274 | target_phys_addr_t end_addr) | |
5832d1f2 AL |
275 | { |
276 | KVMState *s = kvm_state; | |
151f7749 JK |
277 | unsigned long size, allocated_size = 0; |
278 | target_phys_addr_t phys_addr; | |
5832d1f2 | 279 | ram_addr_t addr; |
151f7749 JK |
280 | KVMDirtyLog d; |
281 | KVMSlot *mem; | |
282 | int ret = 0; | |
5832d1f2 | 283 | |
151f7749 JK |
284 | d.dirty_bitmap = NULL; |
285 | while (start_addr < end_addr) { | |
286 | mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr); | |
287 | if (mem == NULL) { | |
288 | break; | |
289 | } | |
5832d1f2 | 290 | |
151f7749 JK |
291 | size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8; |
292 | if (!d.dirty_bitmap) { | |
293 | d.dirty_bitmap = qemu_malloc(size); | |
294 | } else if (size > allocated_size) { | |
295 | d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size); | |
296 | } | |
297 | allocated_size = size; | |
298 | memset(d.dirty_bitmap, 0, allocated_size); | |
5832d1f2 | 299 | |
151f7749 | 300 | d.slot = mem->slot; |
5832d1f2 | 301 | |
151f7749 JK |
302 | if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) { |
303 | dprintf("ioctl failed %d\n", errno); | |
304 | ret = -1; | |
305 | break; | |
306 | } | |
5832d1f2 | 307 | |
151f7749 JK |
308 | for (phys_addr = mem->start_addr, addr = mem->phys_offset; |
309 | phys_addr < mem->start_addr + mem->memory_size; | |
310 | phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) { | |
311 | unsigned long *bitmap = (unsigned long *)d.dirty_bitmap; | |
312 | unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS; | |
313 | unsigned word = nr / (sizeof(*bitmap) * 8); | |
314 | unsigned bit = nr % (sizeof(*bitmap) * 8); | |
315 | ||
316 | if ((bitmap[word] >> bit) & 1) { | |
317 | cpu_physical_memory_set_dirty(addr); | |
318 | } | |
319 | } | |
320 | start_addr = phys_addr; | |
5832d1f2 | 321 | } |
5832d1f2 | 322 | qemu_free(d.dirty_bitmap); |
151f7749 JK |
323 | |
324 | return ret; | |
5832d1f2 AL |
325 | } |
326 | ||
f65ed4c1 AL |
327 | int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) |
328 | { | |
329 | int ret = -ENOSYS; | |
330 | #ifdef KVM_CAP_COALESCED_MMIO | |
331 | KVMState *s = kvm_state; | |
332 | ||
333 | if (s->coalesced_mmio) { | |
334 | struct kvm_coalesced_mmio_zone zone; | |
335 | ||
336 | zone.addr = start; | |
337 | zone.size = size; | |
338 | ||
339 | ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); | |
340 | } | |
341 | #endif | |
342 | ||
343 | return ret; | |
344 | } | |
345 | ||
346 | int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) | |
347 | { | |
348 | int ret = -ENOSYS; | |
349 | #ifdef KVM_CAP_COALESCED_MMIO | |
350 | KVMState *s = kvm_state; | |
351 | ||
352 | if (s->coalesced_mmio) { | |
353 | struct kvm_coalesced_mmio_zone zone; | |
354 | ||
355 | zone.addr = start; | |
356 | zone.size = size; | |
357 | ||
358 | ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); | |
359 | } | |
360 | #endif | |
361 | ||
362 | return ret; | |
363 | } | |
364 | ||
ad7b8b33 AL |
365 | int kvm_check_extension(KVMState *s, unsigned int extension) |
366 | { | |
367 | int ret; | |
368 | ||
369 | ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension); | |
370 | if (ret < 0) { | |
371 | ret = 0; | |
372 | } | |
373 | ||
374 | return ret; | |
375 | } | |
376 | ||
05330448 AL |
377 | int kvm_init(int smp_cpus) |
378 | { | |
168ccc11 JK |
379 | static const char upgrade_note[] = |
380 | "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n" | |
381 | "(see http://sourceforge.net/projects/kvm).\n"; | |
05330448 AL |
382 | KVMState *s; |
383 | int ret; | |
384 | int i; | |
385 | ||
9f8fd694 MM |
386 | if (smp_cpus > 1) { |
387 | fprintf(stderr, "No SMP KVM support, use '-smp 1'\n"); | |
05330448 | 388 | return -EINVAL; |
9f8fd694 | 389 | } |
05330448 AL |
390 | |
391 | s = qemu_mallocz(sizeof(KVMState)); | |
05330448 | 392 | |
e22a25c9 AL |
393 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
394 | TAILQ_INIT(&s->kvm_sw_breakpoints); | |
395 | #endif | |
05330448 AL |
396 | for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
397 | s->slots[i].slot = i; | |
398 | ||
399 | s->vmfd = -1; | |
400 | s->fd = open("/dev/kvm", O_RDWR); | |
401 | if (s->fd == -1) { | |
402 | fprintf(stderr, "Could not access KVM kernel module: %m\n"); | |
403 | ret = -errno; | |
404 | goto err; | |
405 | } | |
406 | ||
407 | ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0); | |
408 | if (ret < KVM_API_VERSION) { | |
409 | if (ret > 0) | |
410 | ret = -EINVAL; | |
411 | fprintf(stderr, "kvm version too old\n"); | |
412 | goto err; | |
413 | } | |
414 | ||
415 | if (ret > KVM_API_VERSION) { | |
416 | ret = -EINVAL; | |
417 | fprintf(stderr, "kvm version not supported\n"); | |
418 | goto err; | |
419 | } | |
420 | ||
421 | s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0); | |
422 | if (s->vmfd < 0) | |
423 | goto err; | |
424 | ||
425 | /* initially, KVM allocated its own memory and we had to jump through | |
426 | * hooks to make phys_ram_base point to this. Modern versions of KVM | |
5579c7f3 | 427 | * just use a user allocated buffer so we can use regular pages |
05330448 AL |
428 | * unmodified. Make sure we have a sufficiently modern version of KVM. |
429 | */ | |
ad7b8b33 AL |
430 | if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) { |
431 | ret = -EINVAL; | |
168ccc11 JK |
432 | fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s", |
433 | upgrade_note); | |
05330448 AL |
434 | goto err; |
435 | } | |
436 | ||
d85dc283 AL |
437 | /* There was a nasty bug in < kvm-80 that prevents memory slots from being |
438 | * destroyed properly. Since we rely on this capability, refuse to work | |
439 | * with any kernel without this capability. */ | |
ad7b8b33 AL |
440 | if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) { |
441 | ret = -EINVAL; | |
d85dc283 AL |
442 | |
443 | fprintf(stderr, | |
168ccc11 JK |
444 | "KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s", |
445 | upgrade_note); | |
d85dc283 AL |
446 | goto err; |
447 | } | |
448 | ||
f65ed4c1 | 449 | #ifdef KVM_CAP_COALESCED_MMIO |
ad7b8b33 AL |
450 | s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); |
451 | #else | |
452 | s->coalesced_mmio = 0; | |
f65ed4c1 AL |
453 | #endif |
454 | ||
e69917e2 JK |
455 | s->broken_set_mem_region = 1; |
456 | #ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS | |
457 | ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS); | |
458 | if (ret > 0) { | |
459 | s->broken_set_mem_region = 0; | |
460 | } | |
461 | #endif | |
462 | ||
05330448 AL |
463 | ret = kvm_arch_init(s, smp_cpus); |
464 | if (ret < 0) | |
465 | goto err; | |
466 | ||
467 | kvm_state = s; | |
468 | ||
469 | return 0; | |
470 | ||
471 | err: | |
472 | if (s) { | |
473 | if (s->vmfd != -1) | |
474 | close(s->vmfd); | |
475 | if (s->fd != -1) | |
476 | close(s->fd); | |
477 | } | |
478 | qemu_free(s); | |
479 | ||
480 | return ret; | |
481 | } | |
482 | ||
483 | static int kvm_handle_io(CPUState *env, uint16_t port, void *data, | |
484 | int direction, int size, uint32_t count) | |
485 | { | |
486 | int i; | |
487 | uint8_t *ptr = data; | |
488 | ||
489 | for (i = 0; i < count; i++) { | |
490 | if (direction == KVM_EXIT_IO_IN) { | |
491 | switch (size) { | |
492 | case 1: | |
493 | stb_p(ptr, cpu_inb(env, port)); | |
494 | break; | |
495 | case 2: | |
496 | stw_p(ptr, cpu_inw(env, port)); | |
497 | break; | |
498 | case 4: | |
499 | stl_p(ptr, cpu_inl(env, port)); | |
500 | break; | |
501 | } | |
502 | } else { | |
503 | switch (size) { | |
504 | case 1: | |
505 | cpu_outb(env, port, ldub_p(ptr)); | |
506 | break; | |
507 | case 2: | |
508 | cpu_outw(env, port, lduw_p(ptr)); | |
509 | break; | |
510 | case 4: | |
511 | cpu_outl(env, port, ldl_p(ptr)); | |
512 | break; | |
513 | } | |
514 | } | |
515 | ||
516 | ptr += size; | |
517 | } | |
518 | ||
519 | return 1; | |
520 | } | |
521 | ||
f65ed4c1 AL |
522 | static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run) |
523 | { | |
524 | #ifdef KVM_CAP_COALESCED_MMIO | |
525 | KVMState *s = kvm_state; | |
526 | if (s->coalesced_mmio) { | |
527 | struct kvm_coalesced_mmio_ring *ring; | |
528 | ||
529 | ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE); | |
530 | while (ring->first != ring->last) { | |
531 | struct kvm_coalesced_mmio *ent; | |
532 | ||
533 | ent = &ring->coalesced_mmio[ring->first]; | |
534 | ||
535 | cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); | |
536 | /* FIXME smp_wmb() */ | |
537 | ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX; | |
538 | } | |
539 | } | |
540 | #endif | |
541 | } | |
542 | ||
05330448 AL |
543 | int kvm_cpu_exec(CPUState *env) |
544 | { | |
545 | struct kvm_run *run = env->kvm_run; | |
546 | int ret; | |
547 | ||
548 | dprintf("kvm_cpu_exec()\n"); | |
549 | ||
550 | do { | |
be214e6c | 551 | if (env->exit_request) { |
05330448 AL |
552 | dprintf("interrupt exit requested\n"); |
553 | ret = 0; | |
554 | break; | |
555 | } | |
556 | ||
8c14c173 | 557 | kvm_arch_pre_run(env, run); |
05330448 AL |
558 | ret = kvm_vcpu_ioctl(env, KVM_RUN, 0); |
559 | kvm_arch_post_run(env, run); | |
560 | ||
561 | if (ret == -EINTR || ret == -EAGAIN) { | |
562 | dprintf("io window exit\n"); | |
563 | ret = 0; | |
564 | break; | |
565 | } | |
566 | ||
567 | if (ret < 0) { | |
568 | dprintf("kvm run failed %s\n", strerror(-ret)); | |
569 | abort(); | |
570 | } | |
571 | ||
f65ed4c1 AL |
572 | kvm_run_coalesced_mmio(env, run); |
573 | ||
05330448 AL |
574 | ret = 0; /* exit loop */ |
575 | switch (run->exit_reason) { | |
576 | case KVM_EXIT_IO: | |
577 | dprintf("handle_io\n"); | |
578 | ret = kvm_handle_io(env, run->io.port, | |
579 | (uint8_t *)run + run->io.data_offset, | |
580 | run->io.direction, | |
581 | run->io.size, | |
582 | run->io.count); | |
583 | break; | |
584 | case KVM_EXIT_MMIO: | |
585 | dprintf("handle_mmio\n"); | |
586 | cpu_physical_memory_rw(run->mmio.phys_addr, | |
587 | run->mmio.data, | |
588 | run->mmio.len, | |
589 | run->mmio.is_write); | |
590 | ret = 1; | |
591 | break; | |
592 | case KVM_EXIT_IRQ_WINDOW_OPEN: | |
593 | dprintf("irq_window_open\n"); | |
594 | break; | |
595 | case KVM_EXIT_SHUTDOWN: | |
596 | dprintf("shutdown\n"); | |
597 | qemu_system_reset_request(); | |
598 | ret = 1; | |
599 | break; | |
600 | case KVM_EXIT_UNKNOWN: | |
601 | dprintf("kvm_exit_unknown\n"); | |
602 | break; | |
603 | case KVM_EXIT_FAIL_ENTRY: | |
604 | dprintf("kvm_exit_fail_entry\n"); | |
605 | break; | |
606 | case KVM_EXIT_EXCEPTION: | |
607 | dprintf("kvm_exit_exception\n"); | |
608 | break; | |
609 | case KVM_EXIT_DEBUG: | |
610 | dprintf("kvm_exit_debug\n"); | |
e22a25c9 AL |
611 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
612 | if (kvm_arch_debug(&run->debug.arch)) { | |
613 | gdb_set_stop_cpu(env); | |
614 | vm_stop(EXCP_DEBUG); | |
615 | env->exception_index = EXCP_DEBUG; | |
616 | return 0; | |
617 | } | |
618 | /* re-enter, this exception was guest-internal */ | |
619 | ret = 1; | |
620 | #endif /* KVM_CAP_SET_GUEST_DEBUG */ | |
05330448 AL |
621 | break; |
622 | default: | |
623 | dprintf("kvm_arch_handle_exit\n"); | |
624 | ret = kvm_arch_handle_exit(env, run); | |
625 | break; | |
626 | } | |
627 | } while (ret > 0); | |
628 | ||
be214e6c AJ |
629 | if (env->exit_request) { |
630 | env->exit_request = 0; | |
becfc390 AL |
631 | env->exception_index = EXCP_INTERRUPT; |
632 | } | |
633 | ||
05330448 AL |
634 | return ret; |
635 | } | |
636 | ||
637 | void kvm_set_phys_mem(target_phys_addr_t start_addr, | |
638 | ram_addr_t size, | |
639 | ram_addr_t phys_offset) | |
640 | { | |
641 | KVMState *s = kvm_state; | |
642 | ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; | |
6152e2ae AL |
643 | KVMSlot *mem, old; |
644 | int err; | |
05330448 | 645 | |
d3f8d37f | 646 | if (start_addr & ~TARGET_PAGE_MASK) { |
e6f4afe0 JK |
647 | if (flags >= IO_MEM_UNASSIGNED) { |
648 | if (!kvm_lookup_overlapping_slot(s, start_addr, | |
649 | start_addr + size)) { | |
650 | return; | |
651 | } | |
652 | fprintf(stderr, "Unaligned split of a KVM memory slot\n"); | |
653 | } else { | |
654 | fprintf(stderr, "Only page-aligned memory slots supported\n"); | |
655 | } | |
d3f8d37f AL |
656 | abort(); |
657 | } | |
658 | ||
05330448 AL |
659 | /* KVM does not support read-only slots */ |
660 | phys_offset &= ~IO_MEM_ROM; | |
661 | ||
6152e2ae AL |
662 | while (1) { |
663 | mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size); | |
664 | if (!mem) { | |
665 | break; | |
666 | } | |
62d60e8c | 667 | |
6152e2ae AL |
668 | if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr && |
669 | (start_addr + size <= mem->start_addr + mem->memory_size) && | |
670 | (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) { | |
671 | /* The new slot fits into the existing one and comes with | |
672 | * identical parameters - nothing to be done. */ | |
05330448 | 673 | return; |
6152e2ae AL |
674 | } |
675 | ||
676 | old = *mem; | |
677 | ||
678 | /* unregister the overlapping slot */ | |
679 | mem->memory_size = 0; | |
680 | err = kvm_set_user_memory_region(s, mem); | |
681 | if (err) { | |
682 | fprintf(stderr, "%s: error unregistering overlapping slot: %s\n", | |
683 | __func__, strerror(-err)); | |
62d60e8c AL |
684 | abort(); |
685 | } | |
6152e2ae AL |
686 | |
687 | /* Workaround for older KVM versions: we can't join slots, even not by | |
688 | * unregistering the previous ones and then registering the larger | |
689 | * slot. We have to maintain the existing fragmentation. Sigh. | |
690 | * | |
691 | * This workaround assumes that the new slot starts at the same | |
692 | * address as the first existing one. If not or if some overlapping | |
693 | * slot comes around later, we will fail (not seen in practice so far) | |
694 | * - and actually require a recent KVM version. */ | |
e69917e2 JK |
695 | if (s->broken_set_mem_region && |
696 | old.start_addr == start_addr && old.memory_size < size && | |
6152e2ae AL |
697 | flags < IO_MEM_UNASSIGNED) { |
698 | mem = kvm_alloc_slot(s); | |
699 | mem->memory_size = old.memory_size; | |
700 | mem->start_addr = old.start_addr; | |
701 | mem->phys_offset = old.phys_offset; | |
702 | mem->flags = 0; | |
703 | ||
704 | err = kvm_set_user_memory_region(s, mem); | |
705 | if (err) { | |
706 | fprintf(stderr, "%s: error updating slot: %s\n", __func__, | |
707 | strerror(-err)); | |
708 | abort(); | |
709 | } | |
710 | ||
711 | start_addr += old.memory_size; | |
712 | phys_offset += old.memory_size; | |
713 | size -= old.memory_size; | |
714 | continue; | |
715 | } | |
716 | ||
717 | /* register prefix slot */ | |
718 | if (old.start_addr < start_addr) { | |
719 | mem = kvm_alloc_slot(s); | |
720 | mem->memory_size = start_addr - old.start_addr; | |
721 | mem->start_addr = old.start_addr; | |
722 | mem->phys_offset = old.phys_offset; | |
723 | mem->flags = 0; | |
724 | ||
725 | err = kvm_set_user_memory_region(s, mem); | |
726 | if (err) { | |
727 | fprintf(stderr, "%s: error registering prefix slot: %s\n", | |
728 | __func__, strerror(-err)); | |
729 | abort(); | |
730 | } | |
731 | } | |
732 | ||
733 | /* register suffix slot */ | |
734 | if (old.start_addr + old.memory_size > start_addr + size) { | |
735 | ram_addr_t size_delta; | |
736 | ||
737 | mem = kvm_alloc_slot(s); | |
738 | mem->start_addr = start_addr + size; | |
739 | size_delta = mem->start_addr - old.start_addr; | |
740 | mem->memory_size = old.memory_size - size_delta; | |
741 | mem->phys_offset = old.phys_offset + size_delta; | |
742 | mem->flags = 0; | |
743 | ||
744 | err = kvm_set_user_memory_region(s, mem); | |
745 | if (err) { | |
746 | fprintf(stderr, "%s: error registering suffix slot: %s\n", | |
747 | __func__, strerror(-err)); | |
748 | abort(); | |
749 | } | |
750 | } | |
05330448 | 751 | } |
6152e2ae AL |
752 | |
753 | /* in case the KVM bug workaround already "consumed" the new slot */ | |
754 | if (!size) | |
755 | return; | |
756 | ||
05330448 AL |
757 | /* KVM does not need to know about this memory */ |
758 | if (flags >= IO_MEM_UNASSIGNED) | |
759 | return; | |
760 | ||
761 | mem = kvm_alloc_slot(s); | |
762 | mem->memory_size = size; | |
34fc643f AL |
763 | mem->start_addr = start_addr; |
764 | mem->phys_offset = phys_offset; | |
05330448 AL |
765 | mem->flags = 0; |
766 | ||
6152e2ae AL |
767 | err = kvm_set_user_memory_region(s, mem); |
768 | if (err) { | |
769 | fprintf(stderr, "%s: error registering slot: %s\n", __func__, | |
770 | strerror(-err)); | |
771 | abort(); | |
772 | } | |
05330448 AL |
773 | } |
774 | ||
984b5181 | 775 | int kvm_ioctl(KVMState *s, int type, ...) |
05330448 AL |
776 | { |
777 | int ret; | |
984b5181 AL |
778 | void *arg; |
779 | va_list ap; | |
05330448 | 780 | |
984b5181 AL |
781 | va_start(ap, type); |
782 | arg = va_arg(ap, void *); | |
783 | va_end(ap); | |
784 | ||
785 | ret = ioctl(s->fd, type, arg); | |
05330448 AL |
786 | if (ret == -1) |
787 | ret = -errno; | |
788 | ||
789 | return ret; | |
790 | } | |
791 | ||
984b5181 | 792 | int kvm_vm_ioctl(KVMState *s, int type, ...) |
05330448 AL |
793 | { |
794 | int ret; | |
984b5181 AL |
795 | void *arg; |
796 | va_list ap; | |
797 | ||
798 | va_start(ap, type); | |
799 | arg = va_arg(ap, void *); | |
800 | va_end(ap); | |
05330448 | 801 | |
984b5181 | 802 | ret = ioctl(s->vmfd, type, arg); |
05330448 AL |
803 | if (ret == -1) |
804 | ret = -errno; | |
805 | ||
806 | return ret; | |
807 | } | |
808 | ||
984b5181 | 809 | int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
05330448 AL |
810 | { |
811 | int ret; | |
984b5181 AL |
812 | void *arg; |
813 | va_list ap; | |
814 | ||
815 | va_start(ap, type); | |
816 | arg = va_arg(ap, void *); | |
817 | va_end(ap); | |
05330448 | 818 | |
984b5181 | 819 | ret = ioctl(env->kvm_fd, type, arg); |
05330448 AL |
820 | if (ret == -1) |
821 | ret = -errno; | |
822 | ||
823 | return ret; | |
824 | } | |
bd322087 AL |
825 | |
826 | int kvm_has_sync_mmu(void) | |
827 | { | |
a9c11522 | 828 | #ifdef KVM_CAP_SYNC_MMU |
bd322087 AL |
829 | KVMState *s = kvm_state; |
830 | ||
ad7b8b33 AL |
831 | return kvm_check_extension(s, KVM_CAP_SYNC_MMU); |
832 | #else | |
bd322087 | 833 | return 0; |
ad7b8b33 | 834 | #endif |
bd322087 | 835 | } |
e22a25c9 | 836 | |
6f0437e8 JK |
837 | void kvm_setup_guest_memory(void *start, size_t size) |
838 | { | |
839 | if (!kvm_has_sync_mmu()) { | |
840 | #ifdef MADV_DONTFORK | |
841 | int ret = madvise(start, size, MADV_DONTFORK); | |
842 | ||
843 | if (ret) { | |
844 | perror("madvice"); | |
845 | exit(1); | |
846 | } | |
847 | #else | |
848 | fprintf(stderr, | |
849 | "Need MADV_DONTFORK in absence of synchronous KVM MMU\n"); | |
850 | exit(1); | |
851 | #endif | |
852 | } | |
853 | } | |
854 | ||
e22a25c9 AL |
855 | #ifdef KVM_CAP_SET_GUEST_DEBUG |
856 | struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env, | |
857 | target_ulong pc) | |
858 | { | |
859 | struct kvm_sw_breakpoint *bp; | |
860 | ||
861 | TAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) { | |
862 | if (bp->pc == pc) | |
863 | return bp; | |
864 | } | |
865 | return NULL; | |
866 | } | |
867 | ||
868 | int kvm_sw_breakpoints_active(CPUState *env) | |
869 | { | |
870 | return !TAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints); | |
871 | } | |
872 | ||
873 | int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) | |
874 | { | |
875 | struct kvm_guest_debug dbg; | |
876 | ||
877 | dbg.control = 0; | |
878 | if (env->singlestep_enabled) | |
879 | dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; | |
880 | ||
881 | kvm_arch_update_guest_debug(env, &dbg); | |
882 | dbg.control |= reinject_trap; | |
883 | ||
884 | return kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg); | |
885 | } | |
886 | ||
887 | int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, | |
888 | target_ulong len, int type) | |
889 | { | |
890 | struct kvm_sw_breakpoint *bp; | |
891 | CPUState *env; | |
892 | int err; | |
893 | ||
894 | if (type == GDB_BREAKPOINT_SW) { | |
895 | bp = kvm_find_sw_breakpoint(current_env, addr); | |
896 | if (bp) { | |
897 | bp->use_count++; | |
898 | return 0; | |
899 | } | |
900 | ||
901 | bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint)); | |
902 | if (!bp) | |
903 | return -ENOMEM; | |
904 | ||
905 | bp->pc = addr; | |
906 | bp->use_count = 1; | |
907 | err = kvm_arch_insert_sw_breakpoint(current_env, bp); | |
908 | if (err) { | |
909 | free(bp); | |
910 | return err; | |
911 | } | |
912 | ||
913 | TAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints, | |
914 | bp, entry); | |
915 | } else { | |
916 | err = kvm_arch_insert_hw_breakpoint(addr, len, type); | |
917 | if (err) | |
918 | return err; | |
919 | } | |
920 | ||
921 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
922 | err = kvm_update_guest_debug(env, 0); | |
923 | if (err) | |
924 | return err; | |
925 | } | |
926 | return 0; | |
927 | } | |
928 | ||
929 | int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, | |
930 | target_ulong len, int type) | |
931 | { | |
932 | struct kvm_sw_breakpoint *bp; | |
933 | CPUState *env; | |
934 | int err; | |
935 | ||
936 | if (type == GDB_BREAKPOINT_SW) { | |
937 | bp = kvm_find_sw_breakpoint(current_env, addr); | |
938 | if (!bp) | |
939 | return -ENOENT; | |
940 | ||
941 | if (bp->use_count > 1) { | |
942 | bp->use_count--; | |
943 | return 0; | |
944 | } | |
945 | ||
946 | err = kvm_arch_remove_sw_breakpoint(current_env, bp); | |
947 | if (err) | |
948 | return err; | |
949 | ||
950 | TAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry); | |
951 | qemu_free(bp); | |
952 | } else { | |
953 | err = kvm_arch_remove_hw_breakpoint(addr, len, type); | |
954 | if (err) | |
955 | return err; | |
956 | } | |
957 | ||
958 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
959 | err = kvm_update_guest_debug(env, 0); | |
960 | if (err) | |
961 | return err; | |
962 | } | |
963 | return 0; | |
964 | } | |
965 | ||
966 | void kvm_remove_all_breakpoints(CPUState *current_env) | |
967 | { | |
968 | struct kvm_sw_breakpoint *bp, *next; | |
969 | KVMState *s = current_env->kvm_state; | |
970 | CPUState *env; | |
971 | ||
972 | TAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { | |
973 | if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) { | |
974 | /* Try harder to find a CPU that currently sees the breakpoint. */ | |
975 | for (env = first_cpu; env != NULL; env = env->next_cpu) { | |
976 | if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) | |
977 | break; | |
978 | } | |
979 | } | |
980 | } | |
981 | kvm_arch_remove_all_hw_breakpoints(); | |
982 | ||
983 | for (env = first_cpu; env != NULL; env = env->next_cpu) | |
984 | kvm_update_guest_debug(env, 0); | |
985 | } | |
986 | ||
987 | #else /* !KVM_CAP_SET_GUEST_DEBUG */ | |
988 | ||
989 | int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) | |
990 | { | |
991 | return -EINVAL; | |
992 | } | |
993 | ||
994 | int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, | |
995 | target_ulong len, int type) | |
996 | { | |
997 | return -EINVAL; | |
998 | } | |
999 | ||
1000 | int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, | |
1001 | target_ulong len, int type) | |
1002 | { | |
1003 | return -EINVAL; | |
1004 | } | |
1005 | ||
1006 | void kvm_remove_all_breakpoints(CPUState *current_env) | |
1007 | { | |
1008 | } | |
1009 | #endif /* !KVM_CAP_SET_GUEST_DEBUG */ |