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05330448
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1/*
2 * QEMU KVM support
3 *
4 * Copyright IBM, Corp. 2008
5832d1f2 5 * Red Hat, Inc. 2008
05330448
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6 *
7 * Authors:
8 * Anthony Liguori <aliguori@us.ibm.com>
5832d1f2 9 * Glauber Costa <gcosta@redhat.com>
05330448
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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>
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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
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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
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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
42typedef 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
51typedef struct kvm_dirty_log KVMDirtyLog;
52
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53int kvm_allowed = 0;
54
55struct 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
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66};
67
68static KVMState *kvm_state;
69
70static KVMSlot *kvm_alloc_slot(KVMState *s)
71{
72 int i;
73
74 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
62d60e8c
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75 /* KVM private memory slots */
76 if (i >= 8 && i < 12)
77 continue;
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78 if (s->slots[i].memory_size == 0)
79 return &s->slots[i];
80 }
81
d3f8d37f
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82 fprintf(stderr, "%s: no free slot available\n", __func__);
83 abort();
84}
85
86static 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
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101 return NULL;
102}
103
6152e2ae
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104/*
105 * Find overlapping slot with lowest start address
106 */
107static 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
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112 int i;
113
114 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
115 KVMSlot *mem = &s->slots[i];
116
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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 }
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126 }
127
6152e2ae 128 return found;
05330448
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129}
130
5832d1f2
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131static 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
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143 return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
144}
145
8d2ba1fb
JK
146static 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
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156int 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);
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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 }
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192err:
193 return ret;
194}
195
f8d926e9
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196int kvm_put_mp_state(CPUState *env)
197{
198 struct kvm_mp_state mp_state = { .mp_state = env->mp_state };
199
200 return kvm_vcpu_ioctl(env, KVM_SET_MP_STATE, &mp_state);
201}
202
203int kvm_get_mp_state(CPUState *env)
204{
205 struct kvm_mp_state mp_state;
206 int ret;
207
208 ret = kvm_vcpu_ioctl(env, KVM_GET_MP_STATE, &mp_state);
209 if (ret < 0) {
210 return ret;
211 }
212 env->mp_state = mp_state.mp_state;
213 return 0;
214}
215
5832d1f2
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216/*
217 * dirty pages logging control
218 */
d3f8d37f 219static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr,
4495d6a7 220 ram_addr_t size, int flags, int mask)
5832d1f2
AL
221{
222 KVMState *s = kvm_state;
d3f8d37f 223 KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size);
4495d6a7
JK
224 int old_flags;
225
5832d1f2 226 if (mem == NULL) {
d3f8d37f
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227 fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-"
228 TARGET_FMT_plx "\n", __func__, phys_addr,
b80a55e6 229 (target_phys_addr_t)(phys_addr + size - 1));
5832d1f2
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230 return -EINVAL;
231 }
232
4495d6a7 233 old_flags = mem->flags;
5832d1f2 234
4495d6a7 235 flags = (mem->flags & ~mask) | flags;
5832d1f2
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236 mem->flags = flags;
237
4495d6a7
JK
238 /* If nothing changed effectively, no need to issue ioctl */
239 if (s->migration_log) {
240 flags |= KVM_MEM_LOG_DIRTY_PAGES;
241 }
242 if (flags == old_flags) {
243 return 0;
244 }
245
5832d1f2
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246 return kvm_set_user_memory_region(s, mem);
247}
248
d3f8d37f 249int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size)
5832d1f2 250{
d3f8d37f 251 return kvm_dirty_pages_log_change(phys_addr, size,
5832d1f2
AL
252 KVM_MEM_LOG_DIRTY_PAGES,
253 KVM_MEM_LOG_DIRTY_PAGES);
254}
255
d3f8d37f 256int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size)
5832d1f2 257{
d3f8d37f 258 return kvm_dirty_pages_log_change(phys_addr, size,
5832d1f2
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259 0,
260 KVM_MEM_LOG_DIRTY_PAGES);
261}
262
4495d6a7
JK
263int kvm_set_migration_log(int enable)
264{
265 KVMState *s = kvm_state;
266 KVMSlot *mem;
267 int i, err;
268
269 s->migration_log = enable;
270
271 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
272 mem = &s->slots[i];
273
274 if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {
275 continue;
276 }
277 err = kvm_set_user_memory_region(s, mem);
278 if (err) {
279 return err;
280 }
281 }
282 return 0;
283}
284
5832d1f2
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285/**
286 * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
287 * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty().
288 * This means all bits are set to dirty.
289 *
d3f8d37f 290 * @start_add: start of logged region.
5832d1f2
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291 * @end_addr: end of logged region.
292 */
151f7749
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293int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr,
294 target_phys_addr_t end_addr)
5832d1f2
AL
295{
296 KVMState *s = kvm_state;
151f7749
JK
297 unsigned long size, allocated_size = 0;
298 target_phys_addr_t phys_addr;
5832d1f2 299 ram_addr_t addr;
151f7749
JK
300 KVMDirtyLog d;
301 KVMSlot *mem;
302 int ret = 0;
5832d1f2 303
151f7749
JK
304 d.dirty_bitmap = NULL;
305 while (start_addr < end_addr) {
306 mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr);
307 if (mem == NULL) {
308 break;
309 }
5832d1f2 310
151f7749
JK
311 size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8;
312 if (!d.dirty_bitmap) {
313 d.dirty_bitmap = qemu_malloc(size);
314 } else if (size > allocated_size) {
315 d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size);
316 }
317 allocated_size = size;
318 memset(d.dirty_bitmap, 0, allocated_size);
5832d1f2 319
151f7749 320 d.slot = mem->slot;
5832d1f2 321
151f7749
JK
322 if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
323 dprintf("ioctl failed %d\n", errno);
324 ret = -1;
325 break;
326 }
5832d1f2 327
151f7749
JK
328 for (phys_addr = mem->start_addr, addr = mem->phys_offset;
329 phys_addr < mem->start_addr + mem->memory_size;
330 phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) {
331 unsigned long *bitmap = (unsigned long *)d.dirty_bitmap;
332 unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS;
333 unsigned word = nr / (sizeof(*bitmap) * 8);
334 unsigned bit = nr % (sizeof(*bitmap) * 8);
335
336 if ((bitmap[word] >> bit) & 1) {
337 cpu_physical_memory_set_dirty(addr);
338 }
339 }
340 start_addr = phys_addr;
5832d1f2 341 }
5832d1f2 342 qemu_free(d.dirty_bitmap);
151f7749
JK
343
344 return ret;
5832d1f2
AL
345}
346
f65ed4c1
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347int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
348{
349 int ret = -ENOSYS;
350#ifdef KVM_CAP_COALESCED_MMIO
351 KVMState *s = kvm_state;
352
353 if (s->coalesced_mmio) {
354 struct kvm_coalesced_mmio_zone zone;
355
356 zone.addr = start;
357 zone.size = size;
358
359 ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
360 }
361#endif
362
363 return ret;
364}
365
366int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
367{
368 int ret = -ENOSYS;
369#ifdef KVM_CAP_COALESCED_MMIO
370 KVMState *s = kvm_state;
371
372 if (s->coalesced_mmio) {
373 struct kvm_coalesced_mmio_zone zone;
374
375 zone.addr = start;
376 zone.size = size;
377
378 ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
379 }
380#endif
381
382 return ret;
383}
384
ad7b8b33
AL
385int kvm_check_extension(KVMState *s, unsigned int extension)
386{
387 int ret;
388
389 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension);
390 if (ret < 0) {
391 ret = 0;
392 }
393
394 return ret;
395}
396
05330448
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397int kvm_init(int smp_cpus)
398{
168ccc11
JK
399 static const char upgrade_note[] =
400 "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
401 "(see http://sourceforge.net/projects/kvm).\n";
05330448
AL
402 KVMState *s;
403 int ret;
404 int i;
405
9f8fd694
MM
406 if (smp_cpus > 1) {
407 fprintf(stderr, "No SMP KVM support, use '-smp 1'\n");
05330448 408 return -EINVAL;
9f8fd694 409 }
05330448
AL
410
411 s = qemu_mallocz(sizeof(KVMState));
05330448 412
e22a25c9
AL
413#ifdef KVM_CAP_SET_GUEST_DEBUG
414 TAILQ_INIT(&s->kvm_sw_breakpoints);
415#endif
05330448
AL
416 for (i = 0; i < ARRAY_SIZE(s->slots); i++)
417 s->slots[i].slot = i;
418
419 s->vmfd = -1;
420 s->fd = open("/dev/kvm", O_RDWR);
421 if (s->fd == -1) {
422 fprintf(stderr, "Could not access KVM kernel module: %m\n");
423 ret = -errno;
424 goto err;
425 }
426
427 ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
428 if (ret < KVM_API_VERSION) {
429 if (ret > 0)
430 ret = -EINVAL;
431 fprintf(stderr, "kvm version too old\n");
432 goto err;
433 }
434
435 if (ret > KVM_API_VERSION) {
436 ret = -EINVAL;
437 fprintf(stderr, "kvm version not supported\n");
438 goto err;
439 }
440
441 s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
442 if (s->vmfd < 0)
443 goto err;
444
445 /* initially, KVM allocated its own memory and we had to jump through
446 * hooks to make phys_ram_base point to this. Modern versions of KVM
5579c7f3 447 * just use a user allocated buffer so we can use regular pages
05330448
AL
448 * unmodified. Make sure we have a sufficiently modern version of KVM.
449 */
ad7b8b33
AL
450 if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) {
451 ret = -EINVAL;
168ccc11
JK
452 fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s",
453 upgrade_note);
05330448
AL
454 goto err;
455 }
456
d85dc283
AL
457 /* There was a nasty bug in < kvm-80 that prevents memory slots from being
458 * destroyed properly. Since we rely on this capability, refuse to work
459 * with any kernel without this capability. */
ad7b8b33
AL
460 if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) {
461 ret = -EINVAL;
d85dc283
AL
462
463 fprintf(stderr,
168ccc11
JK
464 "KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s",
465 upgrade_note);
d85dc283
AL
466 goto err;
467 }
468
f65ed4c1 469#ifdef KVM_CAP_COALESCED_MMIO
ad7b8b33
AL
470 s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);
471#else
472 s->coalesced_mmio = 0;
f65ed4c1
AL
473#endif
474
e69917e2
JK
475 s->broken_set_mem_region = 1;
476#ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
477 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS);
478 if (ret > 0) {
479 s->broken_set_mem_region = 0;
480 }
481#endif
482
05330448
AL
483 ret = kvm_arch_init(s, smp_cpus);
484 if (ret < 0)
485 goto err;
486
487 kvm_state = s;
488
489 return 0;
490
491err:
492 if (s) {
493 if (s->vmfd != -1)
494 close(s->vmfd);
495 if (s->fd != -1)
496 close(s->fd);
497 }
498 qemu_free(s);
499
500 return ret;
501}
502
503static int kvm_handle_io(CPUState *env, uint16_t port, void *data,
504 int direction, int size, uint32_t count)
505{
506 int i;
507 uint8_t *ptr = data;
508
509 for (i = 0; i < count; i++) {
510 if (direction == KVM_EXIT_IO_IN) {
511 switch (size) {
512 case 1:
513 stb_p(ptr, cpu_inb(env, port));
514 break;
515 case 2:
516 stw_p(ptr, cpu_inw(env, port));
517 break;
518 case 4:
519 stl_p(ptr, cpu_inl(env, port));
520 break;
521 }
522 } else {
523 switch (size) {
524 case 1:
525 cpu_outb(env, port, ldub_p(ptr));
526 break;
527 case 2:
528 cpu_outw(env, port, lduw_p(ptr));
529 break;
530 case 4:
531 cpu_outl(env, port, ldl_p(ptr));
532 break;
533 }
534 }
535
536 ptr += size;
537 }
538
539 return 1;
540}
541
f65ed4c1
AL
542static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run)
543{
544#ifdef KVM_CAP_COALESCED_MMIO
545 KVMState *s = kvm_state;
546 if (s->coalesced_mmio) {
547 struct kvm_coalesced_mmio_ring *ring;
548
549 ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE);
550 while (ring->first != ring->last) {
551 struct kvm_coalesced_mmio *ent;
552
553 ent = &ring->coalesced_mmio[ring->first];
554
555 cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
556 /* FIXME smp_wmb() */
557 ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
558 }
559 }
560#endif
561}
562
05330448
AL
563int kvm_cpu_exec(CPUState *env)
564{
565 struct kvm_run *run = env->kvm_run;
566 int ret;
567
568 dprintf("kvm_cpu_exec()\n");
569
570 do {
be214e6c 571 if (env->exit_request) {
05330448
AL
572 dprintf("interrupt exit requested\n");
573 ret = 0;
574 break;
575 }
576
8c14c173 577 kvm_arch_pre_run(env, run);
05330448
AL
578 ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
579 kvm_arch_post_run(env, run);
580
581 if (ret == -EINTR || ret == -EAGAIN) {
582 dprintf("io window exit\n");
583 ret = 0;
584 break;
585 }
586
587 if (ret < 0) {
588 dprintf("kvm run failed %s\n", strerror(-ret));
589 abort();
590 }
591
f65ed4c1
AL
592 kvm_run_coalesced_mmio(env, run);
593
05330448
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594 ret = 0; /* exit loop */
595 switch (run->exit_reason) {
596 case KVM_EXIT_IO:
597 dprintf("handle_io\n");
598 ret = kvm_handle_io(env, run->io.port,
599 (uint8_t *)run + run->io.data_offset,
600 run->io.direction,
601 run->io.size,
602 run->io.count);
603 break;
604 case KVM_EXIT_MMIO:
605 dprintf("handle_mmio\n");
606 cpu_physical_memory_rw(run->mmio.phys_addr,
607 run->mmio.data,
608 run->mmio.len,
609 run->mmio.is_write);
610 ret = 1;
611 break;
612 case KVM_EXIT_IRQ_WINDOW_OPEN:
613 dprintf("irq_window_open\n");
614 break;
615 case KVM_EXIT_SHUTDOWN:
616 dprintf("shutdown\n");
617 qemu_system_reset_request();
618 ret = 1;
619 break;
620 case KVM_EXIT_UNKNOWN:
621 dprintf("kvm_exit_unknown\n");
622 break;
623 case KVM_EXIT_FAIL_ENTRY:
624 dprintf("kvm_exit_fail_entry\n");
625 break;
626 case KVM_EXIT_EXCEPTION:
627 dprintf("kvm_exit_exception\n");
628 break;
629 case KVM_EXIT_DEBUG:
630 dprintf("kvm_exit_debug\n");
e22a25c9
AL
631#ifdef KVM_CAP_SET_GUEST_DEBUG
632 if (kvm_arch_debug(&run->debug.arch)) {
633 gdb_set_stop_cpu(env);
634 vm_stop(EXCP_DEBUG);
635 env->exception_index = EXCP_DEBUG;
636 return 0;
637 }
638 /* re-enter, this exception was guest-internal */
639 ret = 1;
640#endif /* KVM_CAP_SET_GUEST_DEBUG */
05330448
AL
641 break;
642 default:
643 dprintf("kvm_arch_handle_exit\n");
644 ret = kvm_arch_handle_exit(env, run);
645 break;
646 }
647 } while (ret > 0);
648
be214e6c
AJ
649 if (env->exit_request) {
650 env->exit_request = 0;
becfc390
AL
651 env->exception_index = EXCP_INTERRUPT;
652 }
653
05330448
AL
654 return ret;
655}
656
657void kvm_set_phys_mem(target_phys_addr_t start_addr,
658 ram_addr_t size,
659 ram_addr_t phys_offset)
660{
661 KVMState *s = kvm_state;
662 ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
6152e2ae
AL
663 KVMSlot *mem, old;
664 int err;
05330448 665
d3f8d37f 666 if (start_addr & ~TARGET_PAGE_MASK) {
e6f4afe0
JK
667 if (flags >= IO_MEM_UNASSIGNED) {
668 if (!kvm_lookup_overlapping_slot(s, start_addr,
669 start_addr + size)) {
670 return;
671 }
672 fprintf(stderr, "Unaligned split of a KVM memory slot\n");
673 } else {
674 fprintf(stderr, "Only page-aligned memory slots supported\n");
675 }
d3f8d37f
AL
676 abort();
677 }
678
05330448
AL
679 /* KVM does not support read-only slots */
680 phys_offset &= ~IO_MEM_ROM;
681
6152e2ae
AL
682 while (1) {
683 mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size);
684 if (!mem) {
685 break;
686 }
62d60e8c 687
6152e2ae
AL
688 if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr &&
689 (start_addr + size <= mem->start_addr + mem->memory_size) &&
690 (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) {
691 /* The new slot fits into the existing one and comes with
692 * identical parameters - nothing to be done. */
05330448 693 return;
6152e2ae
AL
694 }
695
696 old = *mem;
697
698 /* unregister the overlapping slot */
699 mem->memory_size = 0;
700 err = kvm_set_user_memory_region(s, mem);
701 if (err) {
702 fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
703 __func__, strerror(-err));
62d60e8c
AL
704 abort();
705 }
6152e2ae
AL
706
707 /* Workaround for older KVM versions: we can't join slots, even not by
708 * unregistering the previous ones and then registering the larger
709 * slot. We have to maintain the existing fragmentation. Sigh.
710 *
711 * This workaround assumes that the new slot starts at the same
712 * address as the first existing one. If not or if some overlapping
713 * slot comes around later, we will fail (not seen in practice so far)
714 * - and actually require a recent KVM version. */
e69917e2
JK
715 if (s->broken_set_mem_region &&
716 old.start_addr == start_addr && old.memory_size < size &&
6152e2ae
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717 flags < IO_MEM_UNASSIGNED) {
718 mem = kvm_alloc_slot(s);
719 mem->memory_size = old.memory_size;
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 updating slot: %s\n", __func__,
727 strerror(-err));
728 abort();
729 }
730
731 start_addr += old.memory_size;
732 phys_offset += old.memory_size;
733 size -= old.memory_size;
734 continue;
735 }
736
737 /* register prefix slot */
738 if (old.start_addr < start_addr) {
739 mem = kvm_alloc_slot(s);
740 mem->memory_size = start_addr - old.start_addr;
741 mem->start_addr = old.start_addr;
742 mem->phys_offset = old.phys_offset;
743 mem->flags = 0;
744
745 err = kvm_set_user_memory_region(s, mem);
746 if (err) {
747 fprintf(stderr, "%s: error registering prefix slot: %s\n",
748 __func__, strerror(-err));
749 abort();
750 }
751 }
752
753 /* register suffix slot */
754 if (old.start_addr + old.memory_size > start_addr + size) {
755 ram_addr_t size_delta;
756
757 mem = kvm_alloc_slot(s);
758 mem->start_addr = start_addr + size;
759 size_delta = mem->start_addr - old.start_addr;
760 mem->memory_size = old.memory_size - size_delta;
761 mem->phys_offset = old.phys_offset + size_delta;
762 mem->flags = 0;
763
764 err = kvm_set_user_memory_region(s, mem);
765 if (err) {
766 fprintf(stderr, "%s: error registering suffix slot: %s\n",
767 __func__, strerror(-err));
768 abort();
769 }
770 }
05330448 771 }
6152e2ae
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772
773 /* in case the KVM bug workaround already "consumed" the new slot */
774 if (!size)
775 return;
776
05330448
AL
777 /* KVM does not need to know about this memory */
778 if (flags >= IO_MEM_UNASSIGNED)
779 return;
780
781 mem = kvm_alloc_slot(s);
782 mem->memory_size = size;
34fc643f
AL
783 mem->start_addr = start_addr;
784 mem->phys_offset = phys_offset;
05330448
AL
785 mem->flags = 0;
786
6152e2ae
AL
787 err = kvm_set_user_memory_region(s, mem);
788 if (err) {
789 fprintf(stderr, "%s: error registering slot: %s\n", __func__,
790 strerror(-err));
791 abort();
792 }
05330448
AL
793}
794
984b5181 795int kvm_ioctl(KVMState *s, int type, ...)
05330448
AL
796{
797 int ret;
984b5181
AL
798 void *arg;
799 va_list ap;
05330448 800
984b5181
AL
801 va_start(ap, type);
802 arg = va_arg(ap, void *);
803 va_end(ap);
804
805 ret = ioctl(s->fd, type, arg);
05330448
AL
806 if (ret == -1)
807 ret = -errno;
808
809 return ret;
810}
811
984b5181 812int kvm_vm_ioctl(KVMState *s, int type, ...)
05330448
AL
813{
814 int ret;
984b5181
AL
815 void *arg;
816 va_list ap;
817
818 va_start(ap, type);
819 arg = va_arg(ap, void *);
820 va_end(ap);
05330448 821
984b5181 822 ret = ioctl(s->vmfd, type, arg);
05330448
AL
823 if (ret == -1)
824 ret = -errno;
825
826 return ret;
827}
828
984b5181 829int kvm_vcpu_ioctl(CPUState *env, int type, ...)
05330448
AL
830{
831 int ret;
984b5181
AL
832 void *arg;
833 va_list ap;
834
835 va_start(ap, type);
836 arg = va_arg(ap, void *);
837 va_end(ap);
05330448 838
984b5181 839 ret = ioctl(env->kvm_fd, type, arg);
05330448
AL
840 if (ret == -1)
841 ret = -errno;
842
843 return ret;
844}
bd322087
AL
845
846int kvm_has_sync_mmu(void)
847{
a9c11522 848#ifdef KVM_CAP_SYNC_MMU
bd322087
AL
849 KVMState *s = kvm_state;
850
ad7b8b33
AL
851 return kvm_check_extension(s, KVM_CAP_SYNC_MMU);
852#else
bd322087 853 return 0;
ad7b8b33 854#endif
bd322087 855}
e22a25c9 856
6f0437e8
JK
857void kvm_setup_guest_memory(void *start, size_t size)
858{
859 if (!kvm_has_sync_mmu()) {
860#ifdef MADV_DONTFORK
861 int ret = madvise(start, size, MADV_DONTFORK);
862
863 if (ret) {
864 perror("madvice");
865 exit(1);
866 }
867#else
868 fprintf(stderr,
869 "Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
870 exit(1);
871#endif
872 }
873}
874
e22a25c9
AL
875#ifdef KVM_CAP_SET_GUEST_DEBUG
876struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env,
877 target_ulong pc)
878{
879 struct kvm_sw_breakpoint *bp;
880
881 TAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) {
882 if (bp->pc == pc)
883 return bp;
884 }
885 return NULL;
886}
887
888int kvm_sw_breakpoints_active(CPUState *env)
889{
890 return !TAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
891}
892
893int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
894{
895 struct kvm_guest_debug dbg;
896
897 dbg.control = 0;
898 if (env->singlestep_enabled)
899 dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
900
901 kvm_arch_update_guest_debug(env, &dbg);
902 dbg.control |= reinject_trap;
903
904 return kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg);
905}
906
907int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
908 target_ulong len, int type)
909{
910 struct kvm_sw_breakpoint *bp;
911 CPUState *env;
912 int err;
913
914 if (type == GDB_BREAKPOINT_SW) {
915 bp = kvm_find_sw_breakpoint(current_env, addr);
916 if (bp) {
917 bp->use_count++;
918 return 0;
919 }
920
921 bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint));
922 if (!bp)
923 return -ENOMEM;
924
925 bp->pc = addr;
926 bp->use_count = 1;
927 err = kvm_arch_insert_sw_breakpoint(current_env, bp);
928 if (err) {
929 free(bp);
930 return err;
931 }
932
933 TAILQ_INSERT_HEAD(&current_env->kvm_state->kvm_sw_breakpoints,
934 bp, entry);
935 } else {
936 err = kvm_arch_insert_hw_breakpoint(addr, len, type);
937 if (err)
938 return err;
939 }
940
941 for (env = first_cpu; env != NULL; env = env->next_cpu) {
942 err = kvm_update_guest_debug(env, 0);
943 if (err)
944 return err;
945 }
946 return 0;
947}
948
949int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
950 target_ulong len, int type)
951{
952 struct kvm_sw_breakpoint *bp;
953 CPUState *env;
954 int err;
955
956 if (type == GDB_BREAKPOINT_SW) {
957 bp = kvm_find_sw_breakpoint(current_env, addr);
958 if (!bp)
959 return -ENOENT;
960
961 if (bp->use_count > 1) {
962 bp->use_count--;
963 return 0;
964 }
965
966 err = kvm_arch_remove_sw_breakpoint(current_env, bp);
967 if (err)
968 return err;
969
970 TAILQ_REMOVE(&current_env->kvm_state->kvm_sw_breakpoints, bp, entry);
971 qemu_free(bp);
972 } else {
973 err = kvm_arch_remove_hw_breakpoint(addr, len, type);
974 if (err)
975 return err;
976 }
977
978 for (env = first_cpu; env != NULL; env = env->next_cpu) {
979 err = kvm_update_guest_debug(env, 0);
980 if (err)
981 return err;
982 }
983 return 0;
984}
985
986void kvm_remove_all_breakpoints(CPUState *current_env)
987{
988 struct kvm_sw_breakpoint *bp, *next;
989 KVMState *s = current_env->kvm_state;
990 CPUState *env;
991
992 TAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) {
993 if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) {
994 /* Try harder to find a CPU that currently sees the breakpoint. */
995 for (env = first_cpu; env != NULL; env = env->next_cpu) {
996 if (kvm_arch_remove_sw_breakpoint(env, bp) == 0)
997 break;
998 }
999 }
1000 }
1001 kvm_arch_remove_all_hw_breakpoints();
1002
1003 for (env = first_cpu; env != NULL; env = env->next_cpu)
1004 kvm_update_guest_debug(env, 0);
1005}
1006
1007#else /* !KVM_CAP_SET_GUEST_DEBUG */
1008
1009int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
1010{
1011 return -EINVAL;
1012}
1013
1014int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
1015 target_ulong len, int type)
1016{
1017 return -EINVAL;
1018}
1019
1020int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
1021 target_ulong len, int type)
1022{
1023 return -EINVAL;
1024}
1025
1026void kvm_remove_all_breakpoints(CPUState *current_env)
1027{
1028}
1029#endif /* !KVM_CAP_SET_GUEST_DEBUG */