cirrus: fix off-by-one in cirrus_bitblt_rop_bkwd_transp_*_16
[qemu.git] / kvm-all.c
1 /*
2 * QEMU KVM support
3 *
4 * Copyright IBM, Corp. 2008
5 * Red Hat, Inc. 2008
6 *
7 * Authors:
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Glauber Costa <gcosta@redhat.com>
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 "qemu/osdep.h"
17 #include <sys/ioctl.h>
18
19 #include <linux/kvm.h>
20
21 #include "qemu-common.h"
22 #include "qemu/atomic.h"
23 #include "qemu/option.h"
24 #include "qemu/config-file.h"
25 #include "qemu/error-report.h"
26 #include "hw/hw.h"
27 #include "hw/pci/msi.h"
28 #include "hw/pci/msix.h"
29 #include "hw/s390x/adapter.h"
30 #include "exec/gdbstub.h"
31 #include "sysemu/kvm_int.h"
32 #include "sysemu/cpus.h"
33 #include "qemu/bswap.h"
34 #include "exec/memory.h"
35 #include "exec/ram_addr.h"
36 #include "exec/address-spaces.h"
37 #include "qemu/event_notifier.h"
38 #include "trace-root.h"
39 #include "hw/irq.h"
40
41 #include "hw/boards.h"
42
43 /* This check must be after config-host.h is included */
44 #ifdef CONFIG_EVENTFD
45 #include <sys/eventfd.h>
46 #endif
47
48 /* KVM uses PAGE_SIZE in its definition of KVM_COALESCED_MMIO_MAX. We
49 * need to use the real host PAGE_SIZE, as that's what KVM will use.
50 */
51 #define PAGE_SIZE getpagesize()
52
53 //#define DEBUG_KVM
54
55 #ifdef DEBUG_KVM
56 #define DPRINTF(fmt, ...) \
57 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
58 #else
59 #define DPRINTF(fmt, ...) \
60 do { } while (0)
61 #endif
62
63 #define KVM_MSI_HASHTAB_SIZE 256
64
65 struct KVMParkedVcpu {
66 unsigned long vcpu_id;
67 int kvm_fd;
68 QLIST_ENTRY(KVMParkedVcpu) node;
69 };
70
71 struct KVMState
72 {
73 AccelState parent_obj;
74
75 int nr_slots;
76 int fd;
77 int vmfd;
78 int coalesced_mmio;
79 struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
80 bool coalesced_flush_in_progress;
81 int broken_set_mem_region;
82 int vcpu_events;
83 int robust_singlestep;
84 int debugregs;
85 #ifdef KVM_CAP_SET_GUEST_DEBUG
86 struct kvm_sw_breakpoint_head kvm_sw_breakpoints;
87 #endif
88 int many_ioeventfds;
89 int intx_set_mask;
90 /* The man page (and posix) say ioctl numbers are signed int, but
91 * they're not. Linux, glibc and *BSD all treat ioctl numbers as
92 * unsigned, and treating them as signed here can break things */
93 unsigned irq_set_ioctl;
94 unsigned int sigmask_len;
95 GHashTable *gsimap;
96 #ifdef KVM_CAP_IRQ_ROUTING
97 struct kvm_irq_routing *irq_routes;
98 int nr_allocated_irq_routes;
99 unsigned long *used_gsi_bitmap;
100 unsigned int gsi_count;
101 QTAILQ_HEAD(msi_hashtab, KVMMSIRoute) msi_hashtab[KVM_MSI_HASHTAB_SIZE];
102 #endif
103 KVMMemoryListener memory_listener;
104 QLIST_HEAD(, KVMParkedVcpu) kvm_parked_vcpus;
105 };
106
107 KVMState *kvm_state;
108 bool kvm_kernel_irqchip;
109 bool kvm_split_irqchip;
110 bool kvm_async_interrupts_allowed;
111 bool kvm_halt_in_kernel_allowed;
112 bool kvm_eventfds_allowed;
113 bool kvm_irqfds_allowed;
114 bool kvm_resamplefds_allowed;
115 bool kvm_msi_via_irqfd_allowed;
116 bool kvm_gsi_routing_allowed;
117 bool kvm_gsi_direct_mapping;
118 bool kvm_allowed;
119 bool kvm_readonly_mem_allowed;
120 bool kvm_vm_attributes_allowed;
121 bool kvm_direct_msi_allowed;
122 bool kvm_ioeventfd_any_length_allowed;
123 bool kvm_msi_use_devid;
124 static bool kvm_immediate_exit;
125
126 static const KVMCapabilityInfo kvm_required_capabilites[] = {
127 KVM_CAP_INFO(USER_MEMORY),
128 KVM_CAP_INFO(DESTROY_MEMORY_REGION_WORKS),
129 KVM_CAP_LAST_INFO
130 };
131
132 int kvm_get_max_memslots(void)
133 {
134 KVMState *s = KVM_STATE(current_machine->accelerator);
135
136 return s->nr_slots;
137 }
138
139 static KVMSlot *kvm_get_free_slot(KVMMemoryListener *kml)
140 {
141 KVMState *s = kvm_state;
142 int i;
143
144 for (i = 0; i < s->nr_slots; i++) {
145 if (kml->slots[i].memory_size == 0) {
146 return &kml->slots[i];
147 }
148 }
149
150 return NULL;
151 }
152
153 bool kvm_has_free_slot(MachineState *ms)
154 {
155 KVMState *s = KVM_STATE(ms->accelerator);
156
157 return kvm_get_free_slot(&s->memory_listener);
158 }
159
160 static KVMSlot *kvm_alloc_slot(KVMMemoryListener *kml)
161 {
162 KVMSlot *slot = kvm_get_free_slot(kml);
163
164 if (slot) {
165 return slot;
166 }
167
168 fprintf(stderr, "%s: no free slot available\n", __func__);
169 abort();
170 }
171
172 static KVMSlot *kvm_lookup_matching_slot(KVMMemoryListener *kml,
173 hwaddr start_addr,
174 hwaddr end_addr)
175 {
176 KVMState *s = kvm_state;
177 int i;
178
179 for (i = 0; i < s->nr_slots; i++) {
180 KVMSlot *mem = &kml->slots[i];
181
182 if (start_addr == mem->start_addr &&
183 end_addr == mem->start_addr + mem->memory_size) {
184 return mem;
185 }
186 }
187
188 return NULL;
189 }
190
191 /*
192 * Find overlapping slot with lowest start address
193 */
194 static KVMSlot *kvm_lookup_overlapping_slot(KVMMemoryListener *kml,
195 hwaddr start_addr,
196 hwaddr end_addr)
197 {
198 KVMState *s = kvm_state;
199 KVMSlot *found = NULL;
200 int i;
201
202 for (i = 0; i < s->nr_slots; i++) {
203 KVMSlot *mem = &kml->slots[i];
204
205 if (mem->memory_size == 0 ||
206 (found && found->start_addr < mem->start_addr)) {
207 continue;
208 }
209
210 if (end_addr > mem->start_addr &&
211 start_addr < mem->start_addr + mem->memory_size) {
212 found = mem;
213 }
214 }
215
216 return found;
217 }
218
219 int kvm_physical_memory_addr_from_host(KVMState *s, void *ram,
220 hwaddr *phys_addr)
221 {
222 KVMMemoryListener *kml = &s->memory_listener;
223 int i;
224
225 for (i = 0; i < s->nr_slots; i++) {
226 KVMSlot *mem = &kml->slots[i];
227
228 if (ram >= mem->ram && ram < mem->ram + mem->memory_size) {
229 *phys_addr = mem->start_addr + (ram - mem->ram);
230 return 1;
231 }
232 }
233
234 return 0;
235 }
236
237 static int kvm_set_user_memory_region(KVMMemoryListener *kml, KVMSlot *slot)
238 {
239 KVMState *s = kvm_state;
240 struct kvm_userspace_memory_region mem;
241
242 mem.slot = slot->slot | (kml->as_id << 16);
243 mem.guest_phys_addr = slot->start_addr;
244 mem.userspace_addr = (unsigned long)slot->ram;
245 mem.flags = slot->flags;
246
247 if (slot->memory_size && mem.flags & KVM_MEM_READONLY) {
248 /* Set the slot size to 0 before setting the slot to the desired
249 * value. This is needed based on KVM commit 75d61fbc. */
250 mem.memory_size = 0;
251 kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
252 }
253 mem.memory_size = slot->memory_size;
254 return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
255 }
256
257 int kvm_destroy_vcpu(CPUState *cpu)
258 {
259 KVMState *s = kvm_state;
260 long mmap_size;
261 struct KVMParkedVcpu *vcpu = NULL;
262 int ret = 0;
263
264 DPRINTF("kvm_destroy_vcpu\n");
265
266 mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
267 if (mmap_size < 0) {
268 ret = mmap_size;
269 DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
270 goto err;
271 }
272
273 ret = munmap(cpu->kvm_run, mmap_size);
274 if (ret < 0) {
275 goto err;
276 }
277
278 vcpu = g_malloc0(sizeof(*vcpu));
279 vcpu->vcpu_id = kvm_arch_vcpu_id(cpu);
280 vcpu->kvm_fd = cpu->kvm_fd;
281 QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node);
282 err:
283 return ret;
284 }
285
286 static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id)
287 {
288 struct KVMParkedVcpu *cpu;
289
290 QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) {
291 if (cpu->vcpu_id == vcpu_id) {
292 int kvm_fd;
293
294 QLIST_REMOVE(cpu, node);
295 kvm_fd = cpu->kvm_fd;
296 g_free(cpu);
297 return kvm_fd;
298 }
299 }
300
301 return kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id);
302 }
303
304 int kvm_init_vcpu(CPUState *cpu)
305 {
306 KVMState *s = kvm_state;
307 long mmap_size;
308 int ret;
309
310 DPRINTF("kvm_init_vcpu\n");
311
312 ret = kvm_get_vcpu(s, kvm_arch_vcpu_id(cpu));
313 if (ret < 0) {
314 DPRINTF("kvm_create_vcpu failed\n");
315 goto err;
316 }
317
318 cpu->kvm_fd = ret;
319 cpu->kvm_state = s;
320 cpu->kvm_vcpu_dirty = true;
321
322 mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
323 if (mmap_size < 0) {
324 ret = mmap_size;
325 DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
326 goto err;
327 }
328
329 cpu->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
330 cpu->kvm_fd, 0);
331 if (cpu->kvm_run == MAP_FAILED) {
332 ret = -errno;
333 DPRINTF("mmap'ing vcpu state failed\n");
334 goto err;
335 }
336
337 if (s->coalesced_mmio && !s->coalesced_mmio_ring) {
338 s->coalesced_mmio_ring =
339 (void *)cpu->kvm_run + s->coalesced_mmio * PAGE_SIZE;
340 }
341
342 ret = kvm_arch_init_vcpu(cpu);
343 err:
344 return ret;
345 }
346
347 /*
348 * dirty pages logging control
349 */
350
351 static int kvm_mem_flags(MemoryRegion *mr)
352 {
353 bool readonly = mr->readonly || memory_region_is_romd(mr);
354 int flags = 0;
355
356 if (memory_region_get_dirty_log_mask(mr) != 0) {
357 flags |= KVM_MEM_LOG_DIRTY_PAGES;
358 }
359 if (readonly && kvm_readonly_mem_allowed) {
360 flags |= KVM_MEM_READONLY;
361 }
362 return flags;
363 }
364
365 static int kvm_slot_update_flags(KVMMemoryListener *kml, KVMSlot *mem,
366 MemoryRegion *mr)
367 {
368 int old_flags;
369
370 old_flags = mem->flags;
371 mem->flags = kvm_mem_flags(mr);
372
373 /* If nothing changed effectively, no need to issue ioctl */
374 if (mem->flags == old_flags) {
375 return 0;
376 }
377
378 return kvm_set_user_memory_region(kml, mem);
379 }
380
381 static int kvm_section_update_flags(KVMMemoryListener *kml,
382 MemoryRegionSection *section)
383 {
384 hwaddr phys_addr = section->offset_within_address_space;
385 ram_addr_t size = int128_get64(section->size);
386 KVMSlot *mem = kvm_lookup_matching_slot(kml, phys_addr, phys_addr + size);
387
388 if (mem == NULL) {
389 return 0;
390 } else {
391 return kvm_slot_update_flags(kml, mem, section->mr);
392 }
393 }
394
395 static void kvm_log_start(MemoryListener *listener,
396 MemoryRegionSection *section,
397 int old, int new)
398 {
399 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
400 int r;
401
402 if (old != 0) {
403 return;
404 }
405
406 r = kvm_section_update_flags(kml, section);
407 if (r < 0) {
408 abort();
409 }
410 }
411
412 static void kvm_log_stop(MemoryListener *listener,
413 MemoryRegionSection *section,
414 int old, int new)
415 {
416 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
417 int r;
418
419 if (new != 0) {
420 return;
421 }
422
423 r = kvm_section_update_flags(kml, section);
424 if (r < 0) {
425 abort();
426 }
427 }
428
429 /* get kvm's dirty pages bitmap and update qemu's */
430 static int kvm_get_dirty_pages_log_range(MemoryRegionSection *section,
431 unsigned long *bitmap)
432 {
433 ram_addr_t start = section->offset_within_region +
434 memory_region_get_ram_addr(section->mr);
435 ram_addr_t pages = int128_get64(section->size) / getpagesize();
436
437 cpu_physical_memory_set_dirty_lebitmap(bitmap, start, pages);
438 return 0;
439 }
440
441 #define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
442
443 /**
444 * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
445 * This function updates qemu's dirty bitmap using
446 * memory_region_set_dirty(). This means all bits are set
447 * to dirty.
448 *
449 * @start_add: start of logged region.
450 * @end_addr: end of logged region.
451 */
452 static int kvm_physical_sync_dirty_bitmap(KVMMemoryListener *kml,
453 MemoryRegionSection *section)
454 {
455 KVMState *s = kvm_state;
456 unsigned long size, allocated_size = 0;
457 struct kvm_dirty_log d = {};
458 KVMSlot *mem;
459 int ret = 0;
460 hwaddr start_addr = section->offset_within_address_space;
461 hwaddr end_addr = start_addr + int128_get64(section->size);
462
463 d.dirty_bitmap = NULL;
464 while (start_addr < end_addr) {
465 mem = kvm_lookup_overlapping_slot(kml, start_addr, end_addr);
466 if (mem == NULL) {
467 break;
468 }
469
470 /* XXX bad kernel interface alert
471 * For dirty bitmap, kernel allocates array of size aligned to
472 * bits-per-long. But for case when the kernel is 64bits and
473 * the userspace is 32bits, userspace can't align to the same
474 * bits-per-long, since sizeof(long) is different between kernel
475 * and user space. This way, userspace will provide buffer which
476 * may be 4 bytes less than the kernel will use, resulting in
477 * userspace memory corruption (which is not detectable by valgrind
478 * too, in most cases).
479 * So for now, let's align to 64 instead of HOST_LONG_BITS here, in
480 * a hope that sizeof(long) won't become >8 any time soon.
481 */
482 size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS),
483 /*HOST_LONG_BITS*/ 64) / 8;
484 if (!d.dirty_bitmap) {
485 d.dirty_bitmap = g_malloc(size);
486 } else if (size > allocated_size) {
487 d.dirty_bitmap = g_realloc(d.dirty_bitmap, size);
488 }
489 allocated_size = size;
490 memset(d.dirty_bitmap, 0, allocated_size);
491
492 d.slot = mem->slot | (kml->as_id << 16);
493 if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
494 DPRINTF("ioctl failed %d\n", errno);
495 ret = -1;
496 break;
497 }
498
499 kvm_get_dirty_pages_log_range(section, d.dirty_bitmap);
500 start_addr = mem->start_addr + mem->memory_size;
501 }
502 g_free(d.dirty_bitmap);
503
504 return ret;
505 }
506
507 static void kvm_coalesce_mmio_region(MemoryListener *listener,
508 MemoryRegionSection *secion,
509 hwaddr start, hwaddr size)
510 {
511 KVMState *s = kvm_state;
512
513 if (s->coalesced_mmio) {
514 struct kvm_coalesced_mmio_zone zone;
515
516 zone.addr = start;
517 zone.size = size;
518 zone.pad = 0;
519
520 (void)kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
521 }
522 }
523
524 static void kvm_uncoalesce_mmio_region(MemoryListener *listener,
525 MemoryRegionSection *secion,
526 hwaddr start, hwaddr size)
527 {
528 KVMState *s = kvm_state;
529
530 if (s->coalesced_mmio) {
531 struct kvm_coalesced_mmio_zone zone;
532
533 zone.addr = start;
534 zone.size = size;
535 zone.pad = 0;
536
537 (void)kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
538 }
539 }
540
541 int kvm_check_extension(KVMState *s, unsigned int extension)
542 {
543 int ret;
544
545 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension);
546 if (ret < 0) {
547 ret = 0;
548 }
549
550 return ret;
551 }
552
553 int kvm_vm_check_extension(KVMState *s, unsigned int extension)
554 {
555 int ret;
556
557 ret = kvm_vm_ioctl(s, KVM_CHECK_EXTENSION, extension);
558 if (ret < 0) {
559 /* VM wide version not implemented, use global one instead */
560 ret = kvm_check_extension(s, extension);
561 }
562
563 return ret;
564 }
565
566 static uint32_t adjust_ioeventfd_endianness(uint32_t val, uint32_t size)
567 {
568 #if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
569 /* The kernel expects ioeventfd values in HOST_WORDS_BIGENDIAN
570 * endianness, but the memory core hands them in target endianness.
571 * For example, PPC is always treated as big-endian even if running
572 * on KVM and on PPC64LE. Correct here.
573 */
574 switch (size) {
575 case 2:
576 val = bswap16(val);
577 break;
578 case 4:
579 val = bswap32(val);
580 break;
581 }
582 #endif
583 return val;
584 }
585
586 static int kvm_set_ioeventfd_mmio(int fd, hwaddr addr, uint32_t val,
587 bool assign, uint32_t size, bool datamatch)
588 {
589 int ret;
590 struct kvm_ioeventfd iofd = {
591 .datamatch = datamatch ? adjust_ioeventfd_endianness(val, size) : 0,
592 .addr = addr,
593 .len = size,
594 .flags = 0,
595 .fd = fd,
596 };
597
598 if (!kvm_enabled()) {
599 return -ENOSYS;
600 }
601
602 if (datamatch) {
603 iofd.flags |= KVM_IOEVENTFD_FLAG_DATAMATCH;
604 }
605 if (!assign) {
606 iofd.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
607 }
608
609 ret = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &iofd);
610
611 if (ret < 0) {
612 return -errno;
613 }
614
615 return 0;
616 }
617
618 static int kvm_set_ioeventfd_pio(int fd, uint16_t addr, uint16_t val,
619 bool assign, uint32_t size, bool datamatch)
620 {
621 struct kvm_ioeventfd kick = {
622 .datamatch = datamatch ? adjust_ioeventfd_endianness(val, size) : 0,
623 .addr = addr,
624 .flags = KVM_IOEVENTFD_FLAG_PIO,
625 .len = size,
626 .fd = fd,
627 };
628 int r;
629 if (!kvm_enabled()) {
630 return -ENOSYS;
631 }
632 if (datamatch) {
633 kick.flags |= KVM_IOEVENTFD_FLAG_DATAMATCH;
634 }
635 if (!assign) {
636 kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
637 }
638 r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
639 if (r < 0) {
640 return r;
641 }
642 return 0;
643 }
644
645
646 static int kvm_check_many_ioeventfds(void)
647 {
648 /* Userspace can use ioeventfd for io notification. This requires a host
649 * that supports eventfd(2) and an I/O thread; since eventfd does not
650 * support SIGIO it cannot interrupt the vcpu.
651 *
652 * Older kernels have a 6 device limit on the KVM io bus. Find out so we
653 * can avoid creating too many ioeventfds.
654 */
655 #if defined(CONFIG_EVENTFD)
656 int ioeventfds[7];
657 int i, ret = 0;
658 for (i = 0; i < ARRAY_SIZE(ioeventfds); i++) {
659 ioeventfds[i] = eventfd(0, EFD_CLOEXEC);
660 if (ioeventfds[i] < 0) {
661 break;
662 }
663 ret = kvm_set_ioeventfd_pio(ioeventfds[i], 0, i, true, 2, true);
664 if (ret < 0) {
665 close(ioeventfds[i]);
666 break;
667 }
668 }
669
670 /* Decide whether many devices are supported or not */
671 ret = i == ARRAY_SIZE(ioeventfds);
672
673 while (i-- > 0) {
674 kvm_set_ioeventfd_pio(ioeventfds[i], 0, i, false, 2, true);
675 close(ioeventfds[i]);
676 }
677 return ret;
678 #else
679 return 0;
680 #endif
681 }
682
683 static const KVMCapabilityInfo *
684 kvm_check_extension_list(KVMState *s, const KVMCapabilityInfo *list)
685 {
686 while (list->name) {
687 if (!kvm_check_extension(s, list->value)) {
688 return list;
689 }
690 list++;
691 }
692 return NULL;
693 }
694
695 static void kvm_set_phys_mem(KVMMemoryListener *kml,
696 MemoryRegionSection *section, bool add)
697 {
698 KVMState *s = kvm_state;
699 KVMSlot *mem, old;
700 int err;
701 MemoryRegion *mr = section->mr;
702 bool writeable = !mr->readonly && !mr->rom_device;
703 hwaddr start_addr = section->offset_within_address_space;
704 ram_addr_t size = int128_get64(section->size);
705 void *ram = NULL;
706 unsigned delta;
707
708 /* kvm works in page size chunks, but the function may be called
709 with sub-page size and unaligned start address. Pad the start
710 address to next and truncate size to previous page boundary. */
711 delta = qemu_real_host_page_size - (start_addr & ~qemu_real_host_page_mask);
712 delta &= ~qemu_real_host_page_mask;
713 if (delta > size) {
714 return;
715 }
716 start_addr += delta;
717 size -= delta;
718 size &= qemu_real_host_page_mask;
719 if (!size || (start_addr & ~qemu_real_host_page_mask)) {
720 return;
721 }
722
723 if (!memory_region_is_ram(mr)) {
724 if (writeable || !kvm_readonly_mem_allowed) {
725 return;
726 } else if (!mr->romd_mode) {
727 /* If the memory device is not in romd_mode, then we actually want
728 * to remove the kvm memory slot so all accesses will trap. */
729 add = false;
730 }
731 }
732
733 ram = memory_region_get_ram_ptr(mr) + section->offset_within_region + delta;
734
735 while (1) {
736 mem = kvm_lookup_overlapping_slot(kml, start_addr, start_addr + size);
737 if (!mem) {
738 break;
739 }
740
741 if (add && start_addr >= mem->start_addr &&
742 (start_addr + size <= mem->start_addr + mem->memory_size) &&
743 (ram - start_addr == mem->ram - mem->start_addr)) {
744 /* The new slot fits into the existing one and comes with
745 * identical parameters - update flags and done. */
746 kvm_slot_update_flags(kml, mem, mr);
747 return;
748 }
749
750 old = *mem;
751
752 if (mem->flags & KVM_MEM_LOG_DIRTY_PAGES) {
753 kvm_physical_sync_dirty_bitmap(kml, section);
754 }
755
756 /* unregister the overlapping slot */
757 mem->memory_size = 0;
758 err = kvm_set_user_memory_region(kml, mem);
759 if (err) {
760 fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
761 __func__, strerror(-err));
762 abort();
763 }
764
765 /* Workaround for older KVM versions: we can't join slots, even not by
766 * unregistering the previous ones and then registering the larger
767 * slot. We have to maintain the existing fragmentation. Sigh.
768 *
769 * This workaround assumes that the new slot starts at the same
770 * address as the first existing one. If not or if some overlapping
771 * slot comes around later, we will fail (not seen in practice so far)
772 * - and actually require a recent KVM version. */
773 if (s->broken_set_mem_region &&
774 old.start_addr == start_addr && old.memory_size < size && add) {
775 mem = kvm_alloc_slot(kml);
776 mem->memory_size = old.memory_size;
777 mem->start_addr = old.start_addr;
778 mem->ram = old.ram;
779 mem->flags = kvm_mem_flags(mr);
780
781 err = kvm_set_user_memory_region(kml, mem);
782 if (err) {
783 fprintf(stderr, "%s: error updating slot: %s\n", __func__,
784 strerror(-err));
785 abort();
786 }
787
788 start_addr += old.memory_size;
789 ram += old.memory_size;
790 size -= old.memory_size;
791 continue;
792 }
793
794 /* register prefix slot */
795 if (old.start_addr < start_addr) {
796 mem = kvm_alloc_slot(kml);
797 mem->memory_size = start_addr - old.start_addr;
798 mem->start_addr = old.start_addr;
799 mem->ram = old.ram;
800 mem->flags = kvm_mem_flags(mr);
801
802 err = kvm_set_user_memory_region(kml, mem);
803 if (err) {
804 fprintf(stderr, "%s: error registering prefix slot: %s\n",
805 __func__, strerror(-err));
806 #ifdef TARGET_PPC
807 fprintf(stderr, "%s: This is probably because your kernel's " \
808 "PAGE_SIZE is too big. Please try to use 4k " \
809 "PAGE_SIZE!\n", __func__);
810 #endif
811 abort();
812 }
813 }
814
815 /* register suffix slot */
816 if (old.start_addr + old.memory_size > start_addr + size) {
817 ram_addr_t size_delta;
818
819 mem = kvm_alloc_slot(kml);
820 mem->start_addr = start_addr + size;
821 size_delta = mem->start_addr - old.start_addr;
822 mem->memory_size = old.memory_size - size_delta;
823 mem->ram = old.ram + size_delta;
824 mem->flags = kvm_mem_flags(mr);
825
826 err = kvm_set_user_memory_region(kml, mem);
827 if (err) {
828 fprintf(stderr, "%s: error registering suffix slot: %s\n",
829 __func__, strerror(-err));
830 abort();
831 }
832 }
833 }
834
835 /* in case the KVM bug workaround already "consumed" the new slot */
836 if (!size) {
837 return;
838 }
839 if (!add) {
840 return;
841 }
842 mem = kvm_alloc_slot(kml);
843 mem->memory_size = size;
844 mem->start_addr = start_addr;
845 mem->ram = ram;
846 mem->flags = kvm_mem_flags(mr);
847
848 err = kvm_set_user_memory_region(kml, mem);
849 if (err) {
850 fprintf(stderr, "%s: error registering slot: %s\n", __func__,
851 strerror(-err));
852 abort();
853 }
854 }
855
856 static void kvm_region_add(MemoryListener *listener,
857 MemoryRegionSection *section)
858 {
859 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
860
861 memory_region_ref(section->mr);
862 kvm_set_phys_mem(kml, section, true);
863 }
864
865 static void kvm_region_del(MemoryListener *listener,
866 MemoryRegionSection *section)
867 {
868 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
869
870 kvm_set_phys_mem(kml, section, false);
871 memory_region_unref(section->mr);
872 }
873
874 static void kvm_log_sync(MemoryListener *listener,
875 MemoryRegionSection *section)
876 {
877 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
878 int r;
879
880 r = kvm_physical_sync_dirty_bitmap(kml, section);
881 if (r < 0) {
882 abort();
883 }
884 }
885
886 static void kvm_mem_ioeventfd_add(MemoryListener *listener,
887 MemoryRegionSection *section,
888 bool match_data, uint64_t data,
889 EventNotifier *e)
890 {
891 int fd = event_notifier_get_fd(e);
892 int r;
893
894 r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
895 data, true, int128_get64(section->size),
896 match_data);
897 if (r < 0) {
898 fprintf(stderr, "%s: error adding ioeventfd: %s\n",
899 __func__, strerror(-r));
900 abort();
901 }
902 }
903
904 static void kvm_mem_ioeventfd_del(MemoryListener *listener,
905 MemoryRegionSection *section,
906 bool match_data, uint64_t data,
907 EventNotifier *e)
908 {
909 int fd = event_notifier_get_fd(e);
910 int r;
911
912 r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
913 data, false, int128_get64(section->size),
914 match_data);
915 if (r < 0) {
916 abort();
917 }
918 }
919
920 static void kvm_io_ioeventfd_add(MemoryListener *listener,
921 MemoryRegionSection *section,
922 bool match_data, uint64_t data,
923 EventNotifier *e)
924 {
925 int fd = event_notifier_get_fd(e);
926 int r;
927
928 r = kvm_set_ioeventfd_pio(fd, section->offset_within_address_space,
929 data, true, int128_get64(section->size),
930 match_data);
931 if (r < 0) {
932 fprintf(stderr, "%s: error adding ioeventfd: %s\n",
933 __func__, strerror(-r));
934 abort();
935 }
936 }
937
938 static void kvm_io_ioeventfd_del(MemoryListener *listener,
939 MemoryRegionSection *section,
940 bool match_data, uint64_t data,
941 EventNotifier *e)
942
943 {
944 int fd = event_notifier_get_fd(e);
945 int r;
946
947 r = kvm_set_ioeventfd_pio(fd, section->offset_within_address_space,
948 data, false, int128_get64(section->size),
949 match_data);
950 if (r < 0) {
951 abort();
952 }
953 }
954
955 void kvm_memory_listener_register(KVMState *s, KVMMemoryListener *kml,
956 AddressSpace *as, int as_id)
957 {
958 int i;
959
960 kml->slots = g_malloc0(s->nr_slots * sizeof(KVMSlot));
961 kml->as_id = as_id;
962
963 for (i = 0; i < s->nr_slots; i++) {
964 kml->slots[i].slot = i;
965 }
966
967 kml->listener.region_add = kvm_region_add;
968 kml->listener.region_del = kvm_region_del;
969 kml->listener.log_start = kvm_log_start;
970 kml->listener.log_stop = kvm_log_stop;
971 kml->listener.log_sync = kvm_log_sync;
972 kml->listener.priority = 10;
973
974 memory_listener_register(&kml->listener, as);
975 }
976
977 static MemoryListener kvm_io_listener = {
978 .eventfd_add = kvm_io_ioeventfd_add,
979 .eventfd_del = kvm_io_ioeventfd_del,
980 .priority = 10,
981 };
982
983 static void kvm_handle_interrupt(CPUState *cpu, int mask)
984 {
985 cpu->interrupt_request |= mask;
986
987 if (!qemu_cpu_is_self(cpu)) {
988 qemu_cpu_kick(cpu);
989 }
990 }
991
992 int kvm_set_irq(KVMState *s, int irq, int level)
993 {
994 struct kvm_irq_level event;
995 int ret;
996
997 assert(kvm_async_interrupts_enabled());
998
999 event.level = level;
1000 event.irq = irq;
1001 ret = kvm_vm_ioctl(s, s->irq_set_ioctl, &event);
1002 if (ret < 0) {
1003 perror("kvm_set_irq");
1004 abort();
1005 }
1006
1007 return (s->irq_set_ioctl == KVM_IRQ_LINE) ? 1 : event.status;
1008 }
1009
1010 #ifdef KVM_CAP_IRQ_ROUTING
1011 typedef struct KVMMSIRoute {
1012 struct kvm_irq_routing_entry kroute;
1013 QTAILQ_ENTRY(KVMMSIRoute) entry;
1014 } KVMMSIRoute;
1015
1016 static void set_gsi(KVMState *s, unsigned int gsi)
1017 {
1018 set_bit(gsi, s->used_gsi_bitmap);
1019 }
1020
1021 static void clear_gsi(KVMState *s, unsigned int gsi)
1022 {
1023 clear_bit(gsi, s->used_gsi_bitmap);
1024 }
1025
1026 void kvm_init_irq_routing(KVMState *s)
1027 {
1028 int gsi_count, i;
1029
1030 gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING) - 1;
1031 if (gsi_count > 0) {
1032 /* Round up so we can search ints using ffs */
1033 s->used_gsi_bitmap = bitmap_new(gsi_count);
1034 s->gsi_count = gsi_count;
1035 }
1036
1037 s->irq_routes = g_malloc0(sizeof(*s->irq_routes));
1038 s->nr_allocated_irq_routes = 0;
1039
1040 if (!kvm_direct_msi_allowed) {
1041 for (i = 0; i < KVM_MSI_HASHTAB_SIZE; i++) {
1042 QTAILQ_INIT(&s->msi_hashtab[i]);
1043 }
1044 }
1045
1046 kvm_arch_init_irq_routing(s);
1047 }
1048
1049 void kvm_irqchip_commit_routes(KVMState *s)
1050 {
1051 int ret;
1052
1053 if (kvm_gsi_direct_mapping()) {
1054 return;
1055 }
1056
1057 if (!kvm_gsi_routing_enabled()) {
1058 return;
1059 }
1060
1061 s->irq_routes->flags = 0;
1062 trace_kvm_irqchip_commit_routes();
1063 ret = kvm_vm_ioctl(s, KVM_SET_GSI_ROUTING, s->irq_routes);
1064 assert(ret == 0);
1065 }
1066
1067 static void kvm_add_routing_entry(KVMState *s,
1068 struct kvm_irq_routing_entry *entry)
1069 {
1070 struct kvm_irq_routing_entry *new;
1071 int n, size;
1072
1073 if (s->irq_routes->nr == s->nr_allocated_irq_routes) {
1074 n = s->nr_allocated_irq_routes * 2;
1075 if (n < 64) {
1076 n = 64;
1077 }
1078 size = sizeof(struct kvm_irq_routing);
1079 size += n * sizeof(*new);
1080 s->irq_routes = g_realloc(s->irq_routes, size);
1081 s->nr_allocated_irq_routes = n;
1082 }
1083 n = s->irq_routes->nr++;
1084 new = &s->irq_routes->entries[n];
1085
1086 *new = *entry;
1087
1088 set_gsi(s, entry->gsi);
1089 }
1090
1091 static int kvm_update_routing_entry(KVMState *s,
1092 struct kvm_irq_routing_entry *new_entry)
1093 {
1094 struct kvm_irq_routing_entry *entry;
1095 int n;
1096
1097 for (n = 0; n < s->irq_routes->nr; n++) {
1098 entry = &s->irq_routes->entries[n];
1099 if (entry->gsi != new_entry->gsi) {
1100 continue;
1101 }
1102
1103 if(!memcmp(entry, new_entry, sizeof *entry)) {
1104 return 0;
1105 }
1106
1107 *entry = *new_entry;
1108
1109 return 0;
1110 }
1111
1112 return -ESRCH;
1113 }
1114
1115 void kvm_irqchip_add_irq_route(KVMState *s, int irq, int irqchip, int pin)
1116 {
1117 struct kvm_irq_routing_entry e = {};
1118
1119 assert(pin < s->gsi_count);
1120
1121 e.gsi = irq;
1122 e.type = KVM_IRQ_ROUTING_IRQCHIP;
1123 e.flags = 0;
1124 e.u.irqchip.irqchip = irqchip;
1125 e.u.irqchip.pin = pin;
1126 kvm_add_routing_entry(s, &e);
1127 }
1128
1129 void kvm_irqchip_release_virq(KVMState *s, int virq)
1130 {
1131 struct kvm_irq_routing_entry *e;
1132 int i;
1133
1134 if (kvm_gsi_direct_mapping()) {
1135 return;
1136 }
1137
1138 for (i = 0; i < s->irq_routes->nr; i++) {
1139 e = &s->irq_routes->entries[i];
1140 if (e->gsi == virq) {
1141 s->irq_routes->nr--;
1142 *e = s->irq_routes->entries[s->irq_routes->nr];
1143 }
1144 }
1145 clear_gsi(s, virq);
1146 kvm_arch_release_virq_post(virq);
1147 }
1148
1149 static unsigned int kvm_hash_msi(uint32_t data)
1150 {
1151 /* This is optimized for IA32 MSI layout. However, no other arch shall
1152 * repeat the mistake of not providing a direct MSI injection API. */
1153 return data & 0xff;
1154 }
1155
1156 static void kvm_flush_dynamic_msi_routes(KVMState *s)
1157 {
1158 KVMMSIRoute *route, *next;
1159 unsigned int hash;
1160
1161 for (hash = 0; hash < KVM_MSI_HASHTAB_SIZE; hash++) {
1162 QTAILQ_FOREACH_SAFE(route, &s->msi_hashtab[hash], entry, next) {
1163 kvm_irqchip_release_virq(s, route->kroute.gsi);
1164 QTAILQ_REMOVE(&s->msi_hashtab[hash], route, entry);
1165 g_free(route);
1166 }
1167 }
1168 }
1169
1170 static int kvm_irqchip_get_virq(KVMState *s)
1171 {
1172 int next_virq;
1173
1174 /*
1175 * PIC and IOAPIC share the first 16 GSI numbers, thus the available
1176 * GSI numbers are more than the number of IRQ route. Allocating a GSI
1177 * number can succeed even though a new route entry cannot be added.
1178 * When this happens, flush dynamic MSI entries to free IRQ route entries.
1179 */
1180 if (!kvm_direct_msi_allowed && s->irq_routes->nr == s->gsi_count) {
1181 kvm_flush_dynamic_msi_routes(s);
1182 }
1183
1184 /* Return the lowest unused GSI in the bitmap */
1185 next_virq = find_first_zero_bit(s->used_gsi_bitmap, s->gsi_count);
1186 if (next_virq >= s->gsi_count) {
1187 return -ENOSPC;
1188 } else {
1189 return next_virq;
1190 }
1191 }
1192
1193 static KVMMSIRoute *kvm_lookup_msi_route(KVMState *s, MSIMessage msg)
1194 {
1195 unsigned int hash = kvm_hash_msi(msg.data);
1196 KVMMSIRoute *route;
1197
1198 QTAILQ_FOREACH(route, &s->msi_hashtab[hash], entry) {
1199 if (route->kroute.u.msi.address_lo == (uint32_t)msg.address &&
1200 route->kroute.u.msi.address_hi == (msg.address >> 32) &&
1201 route->kroute.u.msi.data == le32_to_cpu(msg.data)) {
1202 return route;
1203 }
1204 }
1205 return NULL;
1206 }
1207
1208 int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
1209 {
1210 struct kvm_msi msi;
1211 KVMMSIRoute *route;
1212
1213 if (kvm_direct_msi_allowed) {
1214 msi.address_lo = (uint32_t)msg.address;
1215 msi.address_hi = msg.address >> 32;
1216 msi.data = le32_to_cpu(msg.data);
1217 msi.flags = 0;
1218 memset(msi.pad, 0, sizeof(msi.pad));
1219
1220 return kvm_vm_ioctl(s, KVM_SIGNAL_MSI, &msi);
1221 }
1222
1223 route = kvm_lookup_msi_route(s, msg);
1224 if (!route) {
1225 int virq;
1226
1227 virq = kvm_irqchip_get_virq(s);
1228 if (virq < 0) {
1229 return virq;
1230 }
1231
1232 route = g_malloc0(sizeof(KVMMSIRoute));
1233 route->kroute.gsi = virq;
1234 route->kroute.type = KVM_IRQ_ROUTING_MSI;
1235 route->kroute.flags = 0;
1236 route->kroute.u.msi.address_lo = (uint32_t)msg.address;
1237 route->kroute.u.msi.address_hi = msg.address >> 32;
1238 route->kroute.u.msi.data = le32_to_cpu(msg.data);
1239
1240 kvm_add_routing_entry(s, &route->kroute);
1241 kvm_irqchip_commit_routes(s);
1242
1243 QTAILQ_INSERT_TAIL(&s->msi_hashtab[kvm_hash_msi(msg.data)], route,
1244 entry);
1245 }
1246
1247 assert(route->kroute.type == KVM_IRQ_ROUTING_MSI);
1248
1249 return kvm_set_irq(s, route->kroute.gsi, 1);
1250 }
1251
1252 int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
1253 {
1254 struct kvm_irq_routing_entry kroute = {};
1255 int virq;
1256 MSIMessage msg = {0, 0};
1257
1258 if (dev) {
1259 msg = pci_get_msi_message(dev, vector);
1260 }
1261
1262 if (kvm_gsi_direct_mapping()) {
1263 return kvm_arch_msi_data_to_gsi(msg.data);
1264 }
1265
1266 if (!kvm_gsi_routing_enabled()) {
1267 return -ENOSYS;
1268 }
1269
1270 virq = kvm_irqchip_get_virq(s);
1271 if (virq < 0) {
1272 return virq;
1273 }
1274
1275 kroute.gsi = virq;
1276 kroute.type = KVM_IRQ_ROUTING_MSI;
1277 kroute.flags = 0;
1278 kroute.u.msi.address_lo = (uint32_t)msg.address;
1279 kroute.u.msi.address_hi = msg.address >> 32;
1280 kroute.u.msi.data = le32_to_cpu(msg.data);
1281 if (kvm_msi_devid_required()) {
1282 kroute.flags = KVM_MSI_VALID_DEVID;
1283 kroute.u.msi.devid = pci_requester_id(dev);
1284 }
1285 if (kvm_arch_fixup_msi_route(&kroute, msg.address, msg.data, dev)) {
1286 kvm_irqchip_release_virq(s, virq);
1287 return -EINVAL;
1288 }
1289
1290 trace_kvm_irqchip_add_msi_route(virq);
1291
1292 kvm_add_routing_entry(s, &kroute);
1293 kvm_arch_add_msi_route_post(&kroute, vector, dev);
1294 kvm_irqchip_commit_routes(s);
1295
1296 return virq;
1297 }
1298
1299 int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg,
1300 PCIDevice *dev)
1301 {
1302 struct kvm_irq_routing_entry kroute = {};
1303
1304 if (kvm_gsi_direct_mapping()) {
1305 return 0;
1306 }
1307
1308 if (!kvm_irqchip_in_kernel()) {
1309 return -ENOSYS;
1310 }
1311
1312 kroute.gsi = virq;
1313 kroute.type = KVM_IRQ_ROUTING_MSI;
1314 kroute.flags = 0;
1315 kroute.u.msi.address_lo = (uint32_t)msg.address;
1316 kroute.u.msi.address_hi = msg.address >> 32;
1317 kroute.u.msi.data = le32_to_cpu(msg.data);
1318 if (kvm_msi_devid_required()) {
1319 kroute.flags = KVM_MSI_VALID_DEVID;
1320 kroute.u.msi.devid = pci_requester_id(dev);
1321 }
1322 if (kvm_arch_fixup_msi_route(&kroute, msg.address, msg.data, dev)) {
1323 return -EINVAL;
1324 }
1325
1326 trace_kvm_irqchip_update_msi_route(virq);
1327
1328 return kvm_update_routing_entry(s, &kroute);
1329 }
1330
1331 static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int rfd, int virq,
1332 bool assign)
1333 {
1334 struct kvm_irqfd irqfd = {
1335 .fd = fd,
1336 .gsi = virq,
1337 .flags = assign ? 0 : KVM_IRQFD_FLAG_DEASSIGN,
1338 };
1339
1340 if (rfd != -1) {
1341 irqfd.flags |= KVM_IRQFD_FLAG_RESAMPLE;
1342 irqfd.resamplefd = rfd;
1343 }
1344
1345 if (!kvm_irqfds_enabled()) {
1346 return -ENOSYS;
1347 }
1348
1349 return kvm_vm_ioctl(s, KVM_IRQFD, &irqfd);
1350 }
1351
1352 int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter)
1353 {
1354 struct kvm_irq_routing_entry kroute = {};
1355 int virq;
1356
1357 if (!kvm_gsi_routing_enabled()) {
1358 return -ENOSYS;
1359 }
1360
1361 virq = kvm_irqchip_get_virq(s);
1362 if (virq < 0) {
1363 return virq;
1364 }
1365
1366 kroute.gsi = virq;
1367 kroute.type = KVM_IRQ_ROUTING_S390_ADAPTER;
1368 kroute.flags = 0;
1369 kroute.u.adapter.summary_addr = adapter->summary_addr;
1370 kroute.u.adapter.ind_addr = adapter->ind_addr;
1371 kroute.u.adapter.summary_offset = adapter->summary_offset;
1372 kroute.u.adapter.ind_offset = adapter->ind_offset;
1373 kroute.u.adapter.adapter_id = adapter->adapter_id;
1374
1375 kvm_add_routing_entry(s, &kroute);
1376
1377 return virq;
1378 }
1379
1380 int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint)
1381 {
1382 struct kvm_irq_routing_entry kroute = {};
1383 int virq;
1384
1385 if (!kvm_gsi_routing_enabled()) {
1386 return -ENOSYS;
1387 }
1388 if (!kvm_check_extension(s, KVM_CAP_HYPERV_SYNIC)) {
1389 return -ENOSYS;
1390 }
1391 virq = kvm_irqchip_get_virq(s);
1392 if (virq < 0) {
1393 return virq;
1394 }
1395
1396 kroute.gsi = virq;
1397 kroute.type = KVM_IRQ_ROUTING_HV_SINT;
1398 kroute.flags = 0;
1399 kroute.u.hv_sint.vcpu = vcpu;
1400 kroute.u.hv_sint.sint = sint;
1401
1402 kvm_add_routing_entry(s, &kroute);
1403 kvm_irqchip_commit_routes(s);
1404
1405 return virq;
1406 }
1407
1408 #else /* !KVM_CAP_IRQ_ROUTING */
1409
1410 void kvm_init_irq_routing(KVMState *s)
1411 {
1412 }
1413
1414 void kvm_irqchip_release_virq(KVMState *s, int virq)
1415 {
1416 }
1417
1418 int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
1419 {
1420 abort();
1421 }
1422
1423 int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
1424 {
1425 return -ENOSYS;
1426 }
1427
1428 int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter)
1429 {
1430 return -ENOSYS;
1431 }
1432
1433 int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint)
1434 {
1435 return -ENOSYS;
1436 }
1437
1438 static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int virq, bool assign)
1439 {
1440 abort();
1441 }
1442
1443 int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg)
1444 {
1445 return -ENOSYS;
1446 }
1447 #endif /* !KVM_CAP_IRQ_ROUTING */
1448
1449 int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
1450 EventNotifier *rn, int virq)
1451 {
1452 return kvm_irqchip_assign_irqfd(s, event_notifier_get_fd(n),
1453 rn ? event_notifier_get_fd(rn) : -1, virq, true);
1454 }
1455
1456 int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
1457 int virq)
1458 {
1459 return kvm_irqchip_assign_irqfd(s, event_notifier_get_fd(n), -1, virq,
1460 false);
1461 }
1462
1463 int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n,
1464 EventNotifier *rn, qemu_irq irq)
1465 {
1466 gpointer key, gsi;
1467 gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
1468
1469 if (!found) {
1470 return -ENXIO;
1471 }
1472 return kvm_irqchip_add_irqfd_notifier_gsi(s, n, rn, GPOINTER_TO_INT(gsi));
1473 }
1474
1475 int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n,
1476 qemu_irq irq)
1477 {
1478 gpointer key, gsi;
1479 gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
1480
1481 if (!found) {
1482 return -ENXIO;
1483 }
1484 return kvm_irqchip_remove_irqfd_notifier_gsi(s, n, GPOINTER_TO_INT(gsi));
1485 }
1486
1487 void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi)
1488 {
1489 g_hash_table_insert(s->gsimap, irq, GINT_TO_POINTER(gsi));
1490 }
1491
1492 static void kvm_irqchip_create(MachineState *machine, KVMState *s)
1493 {
1494 int ret;
1495
1496 if (kvm_check_extension(s, KVM_CAP_IRQCHIP)) {
1497 ;
1498 } else if (kvm_check_extension(s, KVM_CAP_S390_IRQCHIP)) {
1499 ret = kvm_vm_enable_cap(s, KVM_CAP_S390_IRQCHIP, 0);
1500 if (ret < 0) {
1501 fprintf(stderr, "Enable kernel irqchip failed: %s\n", strerror(-ret));
1502 exit(1);
1503 }
1504 } else {
1505 return;
1506 }
1507
1508 /* First probe and see if there's a arch-specific hook to create the
1509 * in-kernel irqchip for us */
1510 ret = kvm_arch_irqchip_create(machine, s);
1511 if (ret == 0) {
1512 if (machine_kernel_irqchip_split(machine)) {
1513 perror("Split IRQ chip mode not supported.");
1514 exit(1);
1515 } else {
1516 ret = kvm_vm_ioctl(s, KVM_CREATE_IRQCHIP);
1517 }
1518 }
1519 if (ret < 0) {
1520 fprintf(stderr, "Create kernel irqchip failed: %s\n", strerror(-ret));
1521 exit(1);
1522 }
1523
1524 kvm_kernel_irqchip = true;
1525 /* If we have an in-kernel IRQ chip then we must have asynchronous
1526 * interrupt delivery (though the reverse is not necessarily true)
1527 */
1528 kvm_async_interrupts_allowed = true;
1529 kvm_halt_in_kernel_allowed = true;
1530
1531 kvm_init_irq_routing(s);
1532
1533 s->gsimap = g_hash_table_new(g_direct_hash, g_direct_equal);
1534 }
1535
1536 /* Find number of supported CPUs using the recommended
1537 * procedure from the kernel API documentation to cope with
1538 * older kernels that may be missing capabilities.
1539 */
1540 static int kvm_recommended_vcpus(KVMState *s)
1541 {
1542 int ret = kvm_check_extension(s, KVM_CAP_NR_VCPUS);
1543 return (ret) ? ret : 4;
1544 }
1545
1546 static int kvm_max_vcpus(KVMState *s)
1547 {
1548 int ret = kvm_check_extension(s, KVM_CAP_MAX_VCPUS);
1549 return (ret) ? ret : kvm_recommended_vcpus(s);
1550 }
1551
1552 static int kvm_max_vcpu_id(KVMState *s)
1553 {
1554 int ret = kvm_check_extension(s, KVM_CAP_MAX_VCPU_ID);
1555 return (ret) ? ret : kvm_max_vcpus(s);
1556 }
1557
1558 bool kvm_vcpu_id_is_valid(int vcpu_id)
1559 {
1560 KVMState *s = KVM_STATE(current_machine->accelerator);
1561 return vcpu_id >= 0 && vcpu_id < kvm_max_vcpu_id(s);
1562 }
1563
1564 static int kvm_init(MachineState *ms)
1565 {
1566 MachineClass *mc = MACHINE_GET_CLASS(ms);
1567 static const char upgrade_note[] =
1568 "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
1569 "(see http://sourceforge.net/projects/kvm).\n";
1570 struct {
1571 const char *name;
1572 int num;
1573 } num_cpus[] = {
1574 { "SMP", smp_cpus },
1575 { "hotpluggable", max_cpus },
1576 { NULL, }
1577 }, *nc = num_cpus;
1578 int soft_vcpus_limit, hard_vcpus_limit;
1579 KVMState *s;
1580 const KVMCapabilityInfo *missing_cap;
1581 int ret;
1582 int type = 0;
1583 const char *kvm_type;
1584
1585 s = KVM_STATE(ms->accelerator);
1586
1587 /*
1588 * On systems where the kernel can support different base page
1589 * sizes, host page size may be different from TARGET_PAGE_SIZE,
1590 * even with KVM. TARGET_PAGE_SIZE is assumed to be the minimum
1591 * page size for the system though.
1592 */
1593 assert(TARGET_PAGE_SIZE <= getpagesize());
1594
1595 s->sigmask_len = 8;
1596
1597 #ifdef KVM_CAP_SET_GUEST_DEBUG
1598 QTAILQ_INIT(&s->kvm_sw_breakpoints);
1599 #endif
1600 QLIST_INIT(&s->kvm_parked_vcpus);
1601 s->vmfd = -1;
1602 s->fd = qemu_open("/dev/kvm", O_RDWR);
1603 if (s->fd == -1) {
1604 fprintf(stderr, "Could not access KVM kernel module: %m\n");
1605 ret = -errno;
1606 goto err;
1607 }
1608
1609 ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
1610 if (ret < KVM_API_VERSION) {
1611 if (ret >= 0) {
1612 ret = -EINVAL;
1613 }
1614 fprintf(stderr, "kvm version too old\n");
1615 goto err;
1616 }
1617
1618 if (ret > KVM_API_VERSION) {
1619 ret = -EINVAL;
1620 fprintf(stderr, "kvm version not supported\n");
1621 goto err;
1622 }
1623
1624 kvm_immediate_exit = kvm_check_extension(s, KVM_CAP_IMMEDIATE_EXIT);
1625 s->nr_slots = kvm_check_extension(s, KVM_CAP_NR_MEMSLOTS);
1626
1627 /* If unspecified, use the default value */
1628 if (!s->nr_slots) {
1629 s->nr_slots = 32;
1630 }
1631
1632 /* check the vcpu limits */
1633 soft_vcpus_limit = kvm_recommended_vcpus(s);
1634 hard_vcpus_limit = kvm_max_vcpus(s);
1635
1636 while (nc->name) {
1637 if (nc->num > soft_vcpus_limit) {
1638 fprintf(stderr,
1639 "Warning: Number of %s cpus requested (%d) exceeds "
1640 "the recommended cpus supported by KVM (%d)\n",
1641 nc->name, nc->num, soft_vcpus_limit);
1642
1643 if (nc->num > hard_vcpus_limit) {
1644 fprintf(stderr, "Number of %s cpus requested (%d) exceeds "
1645 "the maximum cpus supported by KVM (%d)\n",
1646 nc->name, nc->num, hard_vcpus_limit);
1647 exit(1);
1648 }
1649 }
1650 nc++;
1651 }
1652
1653 kvm_type = qemu_opt_get(qemu_get_machine_opts(), "kvm-type");
1654 if (mc->kvm_type) {
1655 type = mc->kvm_type(kvm_type);
1656 } else if (kvm_type) {
1657 ret = -EINVAL;
1658 fprintf(stderr, "Invalid argument kvm-type=%s\n", kvm_type);
1659 goto err;
1660 }
1661
1662 do {
1663 ret = kvm_ioctl(s, KVM_CREATE_VM, type);
1664 } while (ret == -EINTR);
1665
1666 if (ret < 0) {
1667 fprintf(stderr, "ioctl(KVM_CREATE_VM) failed: %d %s\n", -ret,
1668 strerror(-ret));
1669
1670 #ifdef TARGET_S390X
1671 if (ret == -EINVAL) {
1672 fprintf(stderr,
1673 "Host kernel setup problem detected. Please verify:\n");
1674 fprintf(stderr, "- for kernels supporting the switch_amode or"
1675 " user_mode parameters, whether\n");
1676 fprintf(stderr,
1677 " user space is running in primary address space\n");
1678 fprintf(stderr,
1679 "- for kernels supporting the vm.allocate_pgste sysctl, "
1680 "whether it is enabled\n");
1681 }
1682 #endif
1683 goto err;
1684 }
1685
1686 s->vmfd = ret;
1687 missing_cap = kvm_check_extension_list(s, kvm_required_capabilites);
1688 if (!missing_cap) {
1689 missing_cap =
1690 kvm_check_extension_list(s, kvm_arch_required_capabilities);
1691 }
1692 if (missing_cap) {
1693 ret = -EINVAL;
1694 fprintf(stderr, "kvm does not support %s\n%s",
1695 missing_cap->name, upgrade_note);
1696 goto err;
1697 }
1698
1699 s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);
1700
1701 s->broken_set_mem_region = 1;
1702 ret = kvm_check_extension(s, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS);
1703 if (ret > 0) {
1704 s->broken_set_mem_region = 0;
1705 }
1706
1707 #ifdef KVM_CAP_VCPU_EVENTS
1708 s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS);
1709 #endif
1710
1711 s->robust_singlestep =
1712 kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP);
1713
1714 #ifdef KVM_CAP_DEBUGREGS
1715 s->debugregs = kvm_check_extension(s, KVM_CAP_DEBUGREGS);
1716 #endif
1717
1718 #ifdef KVM_CAP_IRQ_ROUTING
1719 kvm_direct_msi_allowed = (kvm_check_extension(s, KVM_CAP_SIGNAL_MSI) > 0);
1720 #endif
1721
1722 s->intx_set_mask = kvm_check_extension(s, KVM_CAP_PCI_2_3);
1723
1724 s->irq_set_ioctl = KVM_IRQ_LINE;
1725 if (kvm_check_extension(s, KVM_CAP_IRQ_INJECT_STATUS)) {
1726 s->irq_set_ioctl = KVM_IRQ_LINE_STATUS;
1727 }
1728
1729 #ifdef KVM_CAP_READONLY_MEM
1730 kvm_readonly_mem_allowed =
1731 (kvm_check_extension(s, KVM_CAP_READONLY_MEM) > 0);
1732 #endif
1733
1734 kvm_eventfds_allowed =
1735 (kvm_check_extension(s, KVM_CAP_IOEVENTFD) > 0);
1736
1737 kvm_irqfds_allowed =
1738 (kvm_check_extension(s, KVM_CAP_IRQFD) > 0);
1739
1740 kvm_resamplefds_allowed =
1741 (kvm_check_extension(s, KVM_CAP_IRQFD_RESAMPLE) > 0);
1742
1743 kvm_vm_attributes_allowed =
1744 (kvm_check_extension(s, KVM_CAP_VM_ATTRIBUTES) > 0);
1745
1746 kvm_ioeventfd_any_length_allowed =
1747 (kvm_check_extension(s, KVM_CAP_IOEVENTFD_ANY_LENGTH) > 0);
1748
1749 ret = kvm_arch_init(ms, s);
1750 if (ret < 0) {
1751 goto err;
1752 }
1753
1754 if (machine_kernel_irqchip_allowed(ms)) {
1755 kvm_irqchip_create(ms, s);
1756 }
1757
1758 kvm_state = s;
1759
1760 if (kvm_eventfds_allowed) {
1761 s->memory_listener.listener.eventfd_add = kvm_mem_ioeventfd_add;
1762 s->memory_listener.listener.eventfd_del = kvm_mem_ioeventfd_del;
1763 }
1764 s->memory_listener.listener.coalesced_mmio_add = kvm_coalesce_mmio_region;
1765 s->memory_listener.listener.coalesced_mmio_del = kvm_uncoalesce_mmio_region;
1766
1767 kvm_memory_listener_register(s, &s->memory_listener,
1768 &address_space_memory, 0);
1769 memory_listener_register(&kvm_io_listener,
1770 &address_space_io);
1771
1772 s->many_ioeventfds = kvm_check_many_ioeventfds();
1773
1774 cpu_interrupt_handler = kvm_handle_interrupt;
1775
1776 return 0;
1777
1778 err:
1779 assert(ret < 0);
1780 if (s->vmfd >= 0) {
1781 close(s->vmfd);
1782 }
1783 if (s->fd != -1) {
1784 close(s->fd);
1785 }
1786 g_free(s->memory_listener.slots);
1787
1788 return ret;
1789 }
1790
1791 void kvm_set_sigmask_len(KVMState *s, unsigned int sigmask_len)
1792 {
1793 s->sigmask_len = sigmask_len;
1794 }
1795
1796 static void kvm_handle_io(uint16_t port, MemTxAttrs attrs, void *data, int direction,
1797 int size, uint32_t count)
1798 {
1799 int i;
1800 uint8_t *ptr = data;
1801
1802 for (i = 0; i < count; i++) {
1803 address_space_rw(&address_space_io, port, attrs,
1804 ptr, size,
1805 direction == KVM_EXIT_IO_OUT);
1806 ptr += size;
1807 }
1808 }
1809
1810 static int kvm_handle_internal_error(CPUState *cpu, struct kvm_run *run)
1811 {
1812 fprintf(stderr, "KVM internal error. Suberror: %d\n",
1813 run->internal.suberror);
1814
1815 if (kvm_check_extension(kvm_state, KVM_CAP_INTERNAL_ERROR_DATA)) {
1816 int i;
1817
1818 for (i = 0; i < run->internal.ndata; ++i) {
1819 fprintf(stderr, "extra data[%d]: %"PRIx64"\n",
1820 i, (uint64_t)run->internal.data[i]);
1821 }
1822 }
1823 if (run->internal.suberror == KVM_INTERNAL_ERROR_EMULATION) {
1824 fprintf(stderr, "emulation failure\n");
1825 if (!kvm_arch_stop_on_emulation_error(cpu)) {
1826 cpu_dump_state(cpu, stderr, fprintf, CPU_DUMP_CODE);
1827 return EXCP_INTERRUPT;
1828 }
1829 }
1830 /* FIXME: Should trigger a qmp message to let management know
1831 * something went wrong.
1832 */
1833 return -1;
1834 }
1835
1836 void kvm_flush_coalesced_mmio_buffer(void)
1837 {
1838 KVMState *s = kvm_state;
1839
1840 if (s->coalesced_flush_in_progress) {
1841 return;
1842 }
1843
1844 s->coalesced_flush_in_progress = true;
1845
1846 if (s->coalesced_mmio_ring) {
1847 struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;
1848 while (ring->first != ring->last) {
1849 struct kvm_coalesced_mmio *ent;
1850
1851 ent = &ring->coalesced_mmio[ring->first];
1852
1853 cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
1854 smp_wmb();
1855 ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
1856 }
1857 }
1858
1859 s->coalesced_flush_in_progress = false;
1860 }
1861
1862 static void do_kvm_cpu_synchronize_state(CPUState *cpu, run_on_cpu_data arg)
1863 {
1864 if (!cpu->kvm_vcpu_dirty) {
1865 kvm_arch_get_registers(cpu);
1866 cpu->kvm_vcpu_dirty = true;
1867 }
1868 }
1869
1870 void kvm_cpu_synchronize_state(CPUState *cpu)
1871 {
1872 if (!cpu->kvm_vcpu_dirty) {
1873 run_on_cpu(cpu, do_kvm_cpu_synchronize_state, RUN_ON_CPU_NULL);
1874 }
1875 }
1876
1877 static void do_kvm_cpu_synchronize_post_reset(CPUState *cpu, run_on_cpu_data arg)
1878 {
1879 kvm_arch_put_registers(cpu, KVM_PUT_RESET_STATE);
1880 cpu->kvm_vcpu_dirty = false;
1881 }
1882
1883 void kvm_cpu_synchronize_post_reset(CPUState *cpu)
1884 {
1885 run_on_cpu(cpu, do_kvm_cpu_synchronize_post_reset, RUN_ON_CPU_NULL);
1886 }
1887
1888 static void do_kvm_cpu_synchronize_post_init(CPUState *cpu, run_on_cpu_data arg)
1889 {
1890 kvm_arch_put_registers(cpu, KVM_PUT_FULL_STATE);
1891 cpu->kvm_vcpu_dirty = false;
1892 }
1893
1894 void kvm_cpu_synchronize_post_init(CPUState *cpu)
1895 {
1896 run_on_cpu(cpu, do_kvm_cpu_synchronize_post_init, RUN_ON_CPU_NULL);
1897 }
1898
1899 #ifdef KVM_HAVE_MCE_INJECTION
1900 static __thread void *pending_sigbus_addr;
1901 static __thread int pending_sigbus_code;
1902 static __thread bool have_sigbus_pending;
1903 #endif
1904
1905 static void kvm_cpu_kick(CPUState *cpu)
1906 {
1907 atomic_set(&cpu->kvm_run->immediate_exit, 1);
1908 }
1909
1910 static void kvm_cpu_kick_self(void)
1911 {
1912 if (kvm_immediate_exit) {
1913 kvm_cpu_kick(current_cpu);
1914 } else {
1915 qemu_cpu_kick_self();
1916 }
1917 }
1918
1919 static void kvm_eat_signals(CPUState *cpu)
1920 {
1921 struct timespec ts = { 0, 0 };
1922 siginfo_t siginfo;
1923 sigset_t waitset;
1924 sigset_t chkset;
1925 int r;
1926
1927 if (kvm_immediate_exit) {
1928 atomic_set(&cpu->kvm_run->immediate_exit, 0);
1929 /* Write kvm_run->immediate_exit before the cpu->exit_request
1930 * write in kvm_cpu_exec.
1931 */
1932 smp_wmb();
1933 return;
1934 }
1935
1936 sigemptyset(&waitset);
1937 sigaddset(&waitset, SIG_IPI);
1938
1939 do {
1940 r = sigtimedwait(&waitset, &siginfo, &ts);
1941 if (r == -1 && !(errno == EAGAIN || errno == EINTR)) {
1942 perror("sigtimedwait");
1943 exit(1);
1944 }
1945
1946 r = sigpending(&chkset);
1947 if (r == -1) {
1948 perror("sigpending");
1949 exit(1);
1950 }
1951 } while (sigismember(&chkset, SIG_IPI));
1952 }
1953
1954 int kvm_cpu_exec(CPUState *cpu)
1955 {
1956 struct kvm_run *run = cpu->kvm_run;
1957 int ret, run_ret;
1958
1959 DPRINTF("kvm_cpu_exec()\n");
1960
1961 if (kvm_arch_process_async_events(cpu)) {
1962 atomic_set(&cpu->exit_request, 0);
1963 return EXCP_HLT;
1964 }
1965
1966 qemu_mutex_unlock_iothread();
1967
1968 do {
1969 MemTxAttrs attrs;
1970
1971 if (cpu->kvm_vcpu_dirty) {
1972 kvm_arch_put_registers(cpu, KVM_PUT_RUNTIME_STATE);
1973 cpu->kvm_vcpu_dirty = false;
1974 }
1975
1976 kvm_arch_pre_run(cpu, run);
1977 if (atomic_read(&cpu->exit_request)) {
1978 DPRINTF("interrupt exit requested\n");
1979 /*
1980 * KVM requires us to reenter the kernel after IO exits to complete
1981 * instruction emulation. This self-signal will ensure that we
1982 * leave ASAP again.
1983 */
1984 kvm_cpu_kick_self();
1985 }
1986
1987 /* Read cpu->exit_request before KVM_RUN reads run->immediate_exit.
1988 * Matching barrier in kvm_eat_signals.
1989 */
1990 smp_rmb();
1991
1992 run_ret = kvm_vcpu_ioctl(cpu, KVM_RUN, 0);
1993
1994 attrs = kvm_arch_post_run(cpu, run);
1995
1996 #ifdef KVM_HAVE_MCE_INJECTION
1997 if (unlikely(have_sigbus_pending)) {
1998 qemu_mutex_lock_iothread();
1999 kvm_arch_on_sigbus_vcpu(cpu, pending_sigbus_code,
2000 pending_sigbus_addr);
2001 have_sigbus_pending = false;
2002 qemu_mutex_unlock_iothread();
2003 }
2004 #endif
2005
2006 if (run_ret < 0) {
2007 if (run_ret == -EINTR || run_ret == -EAGAIN) {
2008 DPRINTF("io window exit\n");
2009 kvm_eat_signals(cpu);
2010 ret = EXCP_INTERRUPT;
2011 break;
2012 }
2013 fprintf(stderr, "error: kvm run failed %s\n",
2014 strerror(-run_ret));
2015 #ifdef TARGET_PPC
2016 if (run_ret == -EBUSY) {
2017 fprintf(stderr,
2018 "This is probably because your SMT is enabled.\n"
2019 "VCPU can only run on primary threads with all "
2020 "secondary threads offline.\n");
2021 }
2022 #endif
2023 ret = -1;
2024 break;
2025 }
2026
2027 trace_kvm_run_exit(cpu->cpu_index, run->exit_reason);
2028 switch (run->exit_reason) {
2029 case KVM_EXIT_IO:
2030 DPRINTF("handle_io\n");
2031 /* Called outside BQL */
2032 kvm_handle_io(run->io.port, attrs,
2033 (uint8_t *)run + run->io.data_offset,
2034 run->io.direction,
2035 run->io.size,
2036 run->io.count);
2037 ret = 0;
2038 break;
2039 case KVM_EXIT_MMIO:
2040 DPRINTF("handle_mmio\n");
2041 /* Called outside BQL */
2042 address_space_rw(&address_space_memory,
2043 run->mmio.phys_addr, attrs,
2044 run->mmio.data,
2045 run->mmio.len,
2046 run->mmio.is_write);
2047 ret = 0;
2048 break;
2049 case KVM_EXIT_IRQ_WINDOW_OPEN:
2050 DPRINTF("irq_window_open\n");
2051 ret = EXCP_INTERRUPT;
2052 break;
2053 case KVM_EXIT_SHUTDOWN:
2054 DPRINTF("shutdown\n");
2055 qemu_system_reset_request();
2056 ret = EXCP_INTERRUPT;
2057 break;
2058 case KVM_EXIT_UNKNOWN:
2059 fprintf(stderr, "KVM: unknown exit, hardware reason %" PRIx64 "\n",
2060 (uint64_t)run->hw.hardware_exit_reason);
2061 ret = -1;
2062 break;
2063 case KVM_EXIT_INTERNAL_ERROR:
2064 ret = kvm_handle_internal_error(cpu, run);
2065 break;
2066 case KVM_EXIT_SYSTEM_EVENT:
2067 switch (run->system_event.type) {
2068 case KVM_SYSTEM_EVENT_SHUTDOWN:
2069 qemu_system_shutdown_request();
2070 ret = EXCP_INTERRUPT;
2071 break;
2072 case KVM_SYSTEM_EVENT_RESET:
2073 qemu_system_reset_request();
2074 ret = EXCP_INTERRUPT;
2075 break;
2076 case KVM_SYSTEM_EVENT_CRASH:
2077 kvm_cpu_synchronize_state(cpu);
2078 qemu_mutex_lock_iothread();
2079 qemu_system_guest_panicked(cpu_get_crash_info(cpu));
2080 qemu_mutex_unlock_iothread();
2081 ret = 0;
2082 break;
2083 default:
2084 DPRINTF("kvm_arch_handle_exit\n");
2085 ret = kvm_arch_handle_exit(cpu, run);
2086 break;
2087 }
2088 break;
2089 default:
2090 DPRINTF("kvm_arch_handle_exit\n");
2091 ret = kvm_arch_handle_exit(cpu, run);
2092 break;
2093 }
2094 } while (ret == 0);
2095
2096 qemu_mutex_lock_iothread();
2097
2098 if (ret < 0) {
2099 cpu_dump_state(cpu, stderr, fprintf, CPU_DUMP_CODE);
2100 vm_stop(RUN_STATE_INTERNAL_ERROR);
2101 }
2102
2103 atomic_set(&cpu->exit_request, 0);
2104 return ret;
2105 }
2106
2107 int kvm_ioctl(KVMState *s, int type, ...)
2108 {
2109 int ret;
2110 void *arg;
2111 va_list ap;
2112
2113 va_start(ap, type);
2114 arg = va_arg(ap, void *);
2115 va_end(ap);
2116
2117 trace_kvm_ioctl(type, arg);
2118 ret = ioctl(s->fd, type, arg);
2119 if (ret == -1) {
2120 ret = -errno;
2121 }
2122 return ret;
2123 }
2124
2125 int kvm_vm_ioctl(KVMState *s, int type, ...)
2126 {
2127 int ret;
2128 void *arg;
2129 va_list ap;
2130
2131 va_start(ap, type);
2132 arg = va_arg(ap, void *);
2133 va_end(ap);
2134
2135 trace_kvm_vm_ioctl(type, arg);
2136 ret = ioctl(s->vmfd, type, arg);
2137 if (ret == -1) {
2138 ret = -errno;
2139 }
2140 return ret;
2141 }
2142
2143 int kvm_vcpu_ioctl(CPUState *cpu, int type, ...)
2144 {
2145 int ret;
2146 void *arg;
2147 va_list ap;
2148
2149 va_start(ap, type);
2150 arg = va_arg(ap, void *);
2151 va_end(ap);
2152
2153 trace_kvm_vcpu_ioctl(cpu->cpu_index, type, arg);
2154 ret = ioctl(cpu->kvm_fd, type, arg);
2155 if (ret == -1) {
2156 ret = -errno;
2157 }
2158 return ret;
2159 }
2160
2161 int kvm_device_ioctl(int fd, int type, ...)
2162 {
2163 int ret;
2164 void *arg;
2165 va_list ap;
2166
2167 va_start(ap, type);
2168 arg = va_arg(ap, void *);
2169 va_end(ap);
2170
2171 trace_kvm_device_ioctl(fd, type, arg);
2172 ret = ioctl(fd, type, arg);
2173 if (ret == -1) {
2174 ret = -errno;
2175 }
2176 return ret;
2177 }
2178
2179 int kvm_vm_check_attr(KVMState *s, uint32_t group, uint64_t attr)
2180 {
2181 int ret;
2182 struct kvm_device_attr attribute = {
2183 .group = group,
2184 .attr = attr,
2185 };
2186
2187 if (!kvm_vm_attributes_allowed) {
2188 return 0;
2189 }
2190
2191 ret = kvm_vm_ioctl(s, KVM_HAS_DEVICE_ATTR, &attribute);
2192 /* kvm returns 0 on success for HAS_DEVICE_ATTR */
2193 return ret ? 0 : 1;
2194 }
2195
2196 int kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr)
2197 {
2198 struct kvm_device_attr attribute = {
2199 .group = group,
2200 .attr = attr,
2201 .flags = 0,
2202 };
2203
2204 return kvm_device_ioctl(dev_fd, KVM_HAS_DEVICE_ATTR, &attribute) ? 0 : 1;
2205 }
2206
2207 void kvm_device_access(int fd, int group, uint64_t attr,
2208 void *val, bool write)
2209 {
2210 struct kvm_device_attr kvmattr;
2211 int err;
2212
2213 kvmattr.flags = 0;
2214 kvmattr.group = group;
2215 kvmattr.attr = attr;
2216 kvmattr.addr = (uintptr_t)val;
2217
2218 err = kvm_device_ioctl(fd,
2219 write ? KVM_SET_DEVICE_ATTR : KVM_GET_DEVICE_ATTR,
2220 &kvmattr);
2221 if (err < 0) {
2222 error_report("KVM_%s_DEVICE_ATTR failed: %s",
2223 write ? "SET" : "GET", strerror(-err));
2224 error_printf("Group %d attr 0x%016" PRIx64 "\n", group, attr);
2225 abort();
2226 }
2227 }
2228
2229 /* Return 1 on success, 0 on failure */
2230 int kvm_has_sync_mmu(void)
2231 {
2232 return kvm_check_extension(kvm_state, KVM_CAP_SYNC_MMU);
2233 }
2234
2235 int kvm_has_vcpu_events(void)
2236 {
2237 return kvm_state->vcpu_events;
2238 }
2239
2240 int kvm_has_robust_singlestep(void)
2241 {
2242 return kvm_state->robust_singlestep;
2243 }
2244
2245 int kvm_has_debugregs(void)
2246 {
2247 return kvm_state->debugregs;
2248 }
2249
2250 int kvm_has_many_ioeventfds(void)
2251 {
2252 if (!kvm_enabled()) {
2253 return 0;
2254 }
2255 return kvm_state->many_ioeventfds;
2256 }
2257
2258 int kvm_has_gsi_routing(void)
2259 {
2260 #ifdef KVM_CAP_IRQ_ROUTING
2261 return kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING);
2262 #else
2263 return false;
2264 #endif
2265 }
2266
2267 int kvm_has_intx_set_mask(void)
2268 {
2269 return kvm_state->intx_set_mask;
2270 }
2271
2272 #ifdef KVM_CAP_SET_GUEST_DEBUG
2273 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *cpu,
2274 target_ulong pc)
2275 {
2276 struct kvm_sw_breakpoint *bp;
2277
2278 QTAILQ_FOREACH(bp, &cpu->kvm_state->kvm_sw_breakpoints, entry) {
2279 if (bp->pc == pc) {
2280 return bp;
2281 }
2282 }
2283 return NULL;
2284 }
2285
2286 int kvm_sw_breakpoints_active(CPUState *cpu)
2287 {
2288 return !QTAILQ_EMPTY(&cpu->kvm_state->kvm_sw_breakpoints);
2289 }
2290
2291 struct kvm_set_guest_debug_data {
2292 struct kvm_guest_debug dbg;
2293 int err;
2294 };
2295
2296 static void kvm_invoke_set_guest_debug(CPUState *cpu, run_on_cpu_data data)
2297 {
2298 struct kvm_set_guest_debug_data *dbg_data =
2299 (struct kvm_set_guest_debug_data *) data.host_ptr;
2300
2301 dbg_data->err = kvm_vcpu_ioctl(cpu, KVM_SET_GUEST_DEBUG,
2302 &dbg_data->dbg);
2303 }
2304
2305 int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap)
2306 {
2307 struct kvm_set_guest_debug_data data;
2308
2309 data.dbg.control = reinject_trap;
2310
2311 if (cpu->singlestep_enabled) {
2312 data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
2313 }
2314 kvm_arch_update_guest_debug(cpu, &data.dbg);
2315
2316 run_on_cpu(cpu, kvm_invoke_set_guest_debug,
2317 RUN_ON_CPU_HOST_PTR(&data));
2318 return data.err;
2319 }
2320
2321 int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,
2322 target_ulong len, int type)
2323 {
2324 struct kvm_sw_breakpoint *bp;
2325 int err;
2326
2327 if (type == GDB_BREAKPOINT_SW) {
2328 bp = kvm_find_sw_breakpoint(cpu, addr);
2329 if (bp) {
2330 bp->use_count++;
2331 return 0;
2332 }
2333
2334 bp = g_malloc(sizeof(struct kvm_sw_breakpoint));
2335 bp->pc = addr;
2336 bp->use_count = 1;
2337 err = kvm_arch_insert_sw_breakpoint(cpu, bp);
2338 if (err) {
2339 g_free(bp);
2340 return err;
2341 }
2342
2343 QTAILQ_INSERT_HEAD(&cpu->kvm_state->kvm_sw_breakpoints, bp, entry);
2344 } else {
2345 err = kvm_arch_insert_hw_breakpoint(addr, len, type);
2346 if (err) {
2347 return err;
2348 }
2349 }
2350
2351 CPU_FOREACH(cpu) {
2352 err = kvm_update_guest_debug(cpu, 0);
2353 if (err) {
2354 return err;
2355 }
2356 }
2357 return 0;
2358 }
2359
2360 int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr,
2361 target_ulong len, int type)
2362 {
2363 struct kvm_sw_breakpoint *bp;
2364 int err;
2365
2366 if (type == GDB_BREAKPOINT_SW) {
2367 bp = kvm_find_sw_breakpoint(cpu, addr);
2368 if (!bp) {
2369 return -ENOENT;
2370 }
2371
2372 if (bp->use_count > 1) {
2373 bp->use_count--;
2374 return 0;
2375 }
2376
2377 err = kvm_arch_remove_sw_breakpoint(cpu, bp);
2378 if (err) {
2379 return err;
2380 }
2381
2382 QTAILQ_REMOVE(&cpu->kvm_state->kvm_sw_breakpoints, bp, entry);
2383 g_free(bp);
2384 } else {
2385 err = kvm_arch_remove_hw_breakpoint(addr, len, type);
2386 if (err) {
2387 return err;
2388 }
2389 }
2390
2391 CPU_FOREACH(cpu) {
2392 err = kvm_update_guest_debug(cpu, 0);
2393 if (err) {
2394 return err;
2395 }
2396 }
2397 return 0;
2398 }
2399
2400 void kvm_remove_all_breakpoints(CPUState *cpu)
2401 {
2402 struct kvm_sw_breakpoint *bp, *next;
2403 KVMState *s = cpu->kvm_state;
2404 CPUState *tmpcpu;
2405
2406 QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) {
2407 if (kvm_arch_remove_sw_breakpoint(cpu, bp) != 0) {
2408 /* Try harder to find a CPU that currently sees the breakpoint. */
2409 CPU_FOREACH(tmpcpu) {
2410 if (kvm_arch_remove_sw_breakpoint(tmpcpu, bp) == 0) {
2411 break;
2412 }
2413 }
2414 }
2415 QTAILQ_REMOVE(&s->kvm_sw_breakpoints, bp, entry);
2416 g_free(bp);
2417 }
2418 kvm_arch_remove_all_hw_breakpoints();
2419
2420 CPU_FOREACH(cpu) {
2421 kvm_update_guest_debug(cpu, 0);
2422 }
2423 }
2424
2425 #else /* !KVM_CAP_SET_GUEST_DEBUG */
2426
2427 int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap)
2428 {
2429 return -EINVAL;
2430 }
2431
2432 int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,
2433 target_ulong len, int type)
2434 {
2435 return -EINVAL;
2436 }
2437
2438 int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr,
2439 target_ulong len, int type)
2440 {
2441 return -EINVAL;
2442 }
2443
2444 void kvm_remove_all_breakpoints(CPUState *cpu)
2445 {
2446 }
2447 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
2448
2449 static int kvm_set_signal_mask(CPUState *cpu, const sigset_t *sigset)
2450 {
2451 KVMState *s = kvm_state;
2452 struct kvm_signal_mask *sigmask;
2453 int r;
2454
2455 sigmask = g_malloc(sizeof(*sigmask) + sizeof(*sigset));
2456
2457 sigmask->len = s->sigmask_len;
2458 memcpy(sigmask->sigset, sigset, sizeof(*sigset));
2459 r = kvm_vcpu_ioctl(cpu, KVM_SET_SIGNAL_MASK, sigmask);
2460 g_free(sigmask);
2461
2462 return r;
2463 }
2464
2465 static void kvm_ipi_signal(int sig)
2466 {
2467 if (current_cpu) {
2468 assert(kvm_immediate_exit);
2469 kvm_cpu_kick(current_cpu);
2470 }
2471 }
2472
2473 void kvm_init_cpu_signals(CPUState *cpu)
2474 {
2475 int r;
2476 sigset_t set;
2477 struct sigaction sigact;
2478
2479 memset(&sigact, 0, sizeof(sigact));
2480 sigact.sa_handler = kvm_ipi_signal;
2481 sigaction(SIG_IPI, &sigact, NULL);
2482
2483 pthread_sigmask(SIG_BLOCK, NULL, &set);
2484 #if defined KVM_HAVE_MCE_INJECTION
2485 sigdelset(&set, SIGBUS);
2486 pthread_sigmask(SIG_SETMASK, &set, NULL);
2487 #endif
2488 sigdelset(&set, SIG_IPI);
2489 if (kvm_immediate_exit) {
2490 r = pthread_sigmask(SIG_SETMASK, &set, NULL);
2491 } else {
2492 r = kvm_set_signal_mask(cpu, &set);
2493 }
2494 if (r) {
2495 fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
2496 exit(1);
2497 }
2498 }
2499
2500 /* Called asynchronously in VCPU thread. */
2501 int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
2502 {
2503 #ifdef KVM_HAVE_MCE_INJECTION
2504 if (have_sigbus_pending) {
2505 return 1;
2506 }
2507 have_sigbus_pending = true;
2508 pending_sigbus_addr = addr;
2509 pending_sigbus_code = code;
2510 atomic_set(&cpu->exit_request, 1);
2511 return 0;
2512 #else
2513 return 1;
2514 #endif
2515 }
2516
2517 /* Called synchronously (via signalfd) in main thread. */
2518 int kvm_on_sigbus(int code, void *addr)
2519 {
2520 #ifdef KVM_HAVE_MCE_INJECTION
2521 /* Action required MCE kills the process if SIGBUS is blocked. Because
2522 * that's what happens in the I/O thread, where we handle MCE via signalfd,
2523 * we can only get action optional here.
2524 */
2525 assert(code != BUS_MCEERR_AR);
2526 kvm_arch_on_sigbus_vcpu(first_cpu, code, addr);
2527 return 0;
2528 #else
2529 return 1;
2530 #endif
2531 }
2532
2533 int kvm_create_device(KVMState *s, uint64_t type, bool test)
2534 {
2535 int ret;
2536 struct kvm_create_device create_dev;
2537
2538 create_dev.type = type;
2539 create_dev.fd = -1;
2540 create_dev.flags = test ? KVM_CREATE_DEVICE_TEST : 0;
2541
2542 if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) {
2543 return -ENOTSUP;
2544 }
2545
2546 ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &create_dev);
2547 if (ret) {
2548 return ret;
2549 }
2550
2551 return test ? 0 : create_dev.fd;
2552 }
2553
2554 bool kvm_device_supported(int vmfd, uint64_t type)
2555 {
2556 struct kvm_create_device create_dev = {
2557 .type = type,
2558 .fd = -1,
2559 .flags = KVM_CREATE_DEVICE_TEST,
2560 };
2561
2562 if (ioctl(vmfd, KVM_CHECK_EXTENSION, KVM_CAP_DEVICE_CTRL) <= 0) {
2563 return false;
2564 }
2565
2566 return (ioctl(vmfd, KVM_CREATE_DEVICE, &create_dev) >= 0);
2567 }
2568
2569 int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source)
2570 {
2571 struct kvm_one_reg reg;
2572 int r;
2573
2574 reg.id = id;
2575 reg.addr = (uintptr_t) source;
2576 r = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
2577 if (r) {
2578 trace_kvm_failed_reg_set(id, strerror(-r));
2579 }
2580 return r;
2581 }
2582
2583 int kvm_get_one_reg(CPUState *cs, uint64_t id, void *target)
2584 {
2585 struct kvm_one_reg reg;
2586 int r;
2587
2588 reg.id = id;
2589 reg.addr = (uintptr_t) target;
2590 r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
2591 if (r) {
2592 trace_kvm_failed_reg_get(id, strerror(-r));
2593 }
2594 return r;
2595 }
2596
2597 static void kvm_accel_class_init(ObjectClass *oc, void *data)
2598 {
2599 AccelClass *ac = ACCEL_CLASS(oc);
2600 ac->name = "KVM";
2601 ac->init_machine = kvm_init;
2602 ac->allowed = &kvm_allowed;
2603 }
2604
2605 static const TypeInfo kvm_accel_type = {
2606 .name = TYPE_KVM_ACCEL,
2607 .parent = TYPE_ACCEL,
2608 .class_init = kvm_accel_class_init,
2609 .instance_size = sizeof(KVMState),
2610 };
2611
2612 static void kvm_type_init(void)
2613 {
2614 type_register_static(&kvm_accel_type);
2615 }
2616
2617 type_init(kvm_type_init);