4 * Copyright IBM, Corp. 2008
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Glauber Costa <gcosta@redhat.com>
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.
16 #include <sys/types.h>
17 #include <sys/ioctl.h>
21 #include <linux/kvm.h>
23 #include "qemu-common.h"
24 #include "qemu-barrier.h"
25 #include "qemu-option.h"
26 #include "qemu-config.h"
34 #include "exec-memory.h"
35 #include "event_notifier.h"
37 /* This check must be after config-host.h is included */
39 #include <sys/eventfd.h>
42 #ifdef CONFIG_VALGRIND_H
43 #include <valgrind/memcheck.h>
46 /* KVM uses PAGE_SIZE in its definition of COALESCED_MMIO_MAX */
47 #define PAGE_SIZE TARGET_PAGE_SIZE
52 #define DPRINTF(fmt, ...) \
53 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
55 #define DPRINTF(fmt, ...) \
59 #define KVM_MSI_HASHTAB_SIZE 256
61 typedef struct KVMSlot
64 ram_addr_t memory_size;
70 typedef struct kvm_dirty_log KVMDirtyLog;
78 struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
79 bool coalesced_flush_in_progress;
80 int broken_set_mem_region;
83 int robust_singlestep;
85 #ifdef KVM_CAP_SET_GUEST_DEBUG
86 struct kvm_sw_breakpoint_head kvm_sw_breakpoints;
92 /* The man page (and posix) say ioctl numbers are signed int, but
93 * they're not. Linux, glibc and *BSD all treat ioctl numbers as
94 * unsigned, and treating them as signed here can break things */
95 unsigned irq_set_ioctl;
96 #ifdef KVM_CAP_IRQ_ROUTING
97 struct kvm_irq_routing *irq_routes;
98 int nr_allocated_irq_routes;
99 uint32_t *used_gsi_bitmap;
100 unsigned int gsi_count;
101 QTAILQ_HEAD(msi_hashtab, KVMMSIRoute) msi_hashtab[KVM_MSI_HASHTAB_SIZE];
107 bool kvm_kernel_irqchip;
108 bool kvm_async_interrupts_allowed;
109 bool kvm_irqfds_allowed;
110 bool kvm_msi_via_irqfd_allowed;
111 bool kvm_gsi_routing_allowed;
113 static const KVMCapabilityInfo kvm_required_capabilites[] = {
114 KVM_CAP_INFO(USER_MEMORY),
115 KVM_CAP_INFO(DESTROY_MEMORY_REGION_WORKS),
119 static KVMSlot *kvm_alloc_slot(KVMState *s)
123 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
124 if (s->slots[i].memory_size == 0) {
129 fprintf(stderr, "%s: no free slot available\n", __func__);
133 static KVMSlot *kvm_lookup_matching_slot(KVMState *s,
139 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
140 KVMSlot *mem = &s->slots[i];
142 if (start_addr == mem->start_addr &&
143 end_addr == mem->start_addr + mem->memory_size) {
152 * Find overlapping slot with lowest start address
154 static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s,
158 KVMSlot *found = NULL;
161 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
162 KVMSlot *mem = &s->slots[i];
164 if (mem->memory_size == 0 ||
165 (found && found->start_addr < mem->start_addr)) {
169 if (end_addr > mem->start_addr &&
170 start_addr < mem->start_addr + mem->memory_size) {
178 int kvm_physical_memory_addr_from_host(KVMState *s, void *ram,
183 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
184 KVMSlot *mem = &s->slots[i];
186 if (ram >= mem->ram && ram < mem->ram + mem->memory_size) {
187 *phys_addr = mem->start_addr + (ram - mem->ram);
195 static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot)
197 struct kvm_userspace_memory_region mem;
199 mem.slot = slot->slot;
200 mem.guest_phys_addr = slot->start_addr;
201 mem.memory_size = slot->memory_size;
202 mem.userspace_addr = (unsigned long)slot->ram;
203 mem.flags = slot->flags;
204 if (s->migration_log) {
205 mem.flags |= KVM_MEM_LOG_DIRTY_PAGES;
207 return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
210 static void kvm_reset_vcpu(void *opaque)
212 CPUArchState *env = opaque;
214 kvm_arch_reset_vcpu(env);
217 int kvm_init_vcpu(CPUArchState *env)
219 KVMState *s = kvm_state;
223 DPRINTF("kvm_init_vcpu\n");
225 ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index);
227 DPRINTF("kvm_create_vcpu failed\n");
233 env->kvm_vcpu_dirty = 1;
235 mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
238 DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
242 env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
244 if (env->kvm_run == MAP_FAILED) {
246 DPRINTF("mmap'ing vcpu state failed\n");
250 if (s->coalesced_mmio && !s->coalesced_mmio_ring) {
251 s->coalesced_mmio_ring =
252 (void *)env->kvm_run + s->coalesced_mmio * PAGE_SIZE;
255 ret = kvm_arch_init_vcpu(env);
257 qemu_register_reset(kvm_reset_vcpu, env);
258 kvm_arch_reset_vcpu(env);
265 * dirty pages logging control
268 static int kvm_mem_flags(KVMState *s, bool log_dirty)
270 return log_dirty ? KVM_MEM_LOG_DIRTY_PAGES : 0;
273 static int kvm_slot_dirty_pages_log_change(KVMSlot *mem, bool log_dirty)
275 KVMState *s = kvm_state;
276 int flags, mask = KVM_MEM_LOG_DIRTY_PAGES;
279 old_flags = mem->flags;
281 flags = (mem->flags & ~mask) | kvm_mem_flags(s, log_dirty);
284 /* If nothing changed effectively, no need to issue ioctl */
285 if (s->migration_log) {
286 flags |= KVM_MEM_LOG_DIRTY_PAGES;
289 if (flags == old_flags) {
293 return kvm_set_user_memory_region(s, mem);
296 static int kvm_dirty_pages_log_change(hwaddr phys_addr,
297 ram_addr_t size, bool log_dirty)
299 KVMState *s = kvm_state;
300 KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size);
303 fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-"
304 TARGET_FMT_plx "\n", __func__, phys_addr,
305 (hwaddr)(phys_addr + size - 1));
308 return kvm_slot_dirty_pages_log_change(mem, log_dirty);
311 static void kvm_log_start(MemoryListener *listener,
312 MemoryRegionSection *section)
316 r = kvm_dirty_pages_log_change(section->offset_within_address_space,
317 section->size, true);
323 static void kvm_log_stop(MemoryListener *listener,
324 MemoryRegionSection *section)
328 r = kvm_dirty_pages_log_change(section->offset_within_address_space,
329 section->size, false);
335 static int kvm_set_migration_log(int enable)
337 KVMState *s = kvm_state;
341 s->migration_log = enable;
343 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
346 if (!mem->memory_size) {
349 if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {
352 err = kvm_set_user_memory_region(s, mem);
360 /* get kvm's dirty pages bitmap and update qemu's */
361 static int kvm_get_dirty_pages_log_range(MemoryRegionSection *section,
362 unsigned long *bitmap)
365 unsigned long page_number, c;
367 unsigned int len = ((section->size / TARGET_PAGE_SIZE) + HOST_LONG_BITS - 1) / HOST_LONG_BITS;
368 unsigned long hpratio = getpagesize() / TARGET_PAGE_SIZE;
371 * bitmap-traveling is faster than memory-traveling (for addr...)
372 * especially when most of the memory is not dirty.
374 for (i = 0; i < len; i++) {
375 if (bitmap[i] != 0) {
376 c = leul_to_cpu(bitmap[i]);
380 page_number = (i * HOST_LONG_BITS + j) * hpratio;
381 addr1 = page_number * TARGET_PAGE_SIZE;
382 addr = section->offset_within_region + addr1;
383 memory_region_set_dirty(section->mr, addr,
384 TARGET_PAGE_SIZE * hpratio);
391 #define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
394 * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
395 * This function updates qemu's dirty bitmap using
396 * memory_region_set_dirty(). This means all bits are set
399 * @start_add: start of logged region.
400 * @end_addr: end of logged region.
402 static int kvm_physical_sync_dirty_bitmap(MemoryRegionSection *section)
404 KVMState *s = kvm_state;
405 unsigned long size, allocated_size = 0;
409 hwaddr start_addr = section->offset_within_address_space;
410 hwaddr end_addr = start_addr + section->size;
412 d.dirty_bitmap = NULL;
413 while (start_addr < end_addr) {
414 mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr);
419 /* XXX bad kernel interface alert
420 * For dirty bitmap, kernel allocates array of size aligned to
421 * bits-per-long. But for case when the kernel is 64bits and
422 * the userspace is 32bits, userspace can't align to the same
423 * bits-per-long, since sizeof(long) is different between kernel
424 * and user space. This way, userspace will provide buffer which
425 * may be 4 bytes less than the kernel will use, resulting in
426 * userspace memory corruption (which is not detectable by valgrind
427 * too, in most cases).
428 * So for now, let's align to 64 instead of HOST_LONG_BITS here, in
429 * a hope that sizeof(long) wont become >8 any time soon.
431 size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS),
432 /*HOST_LONG_BITS*/ 64) / 8;
433 if (!d.dirty_bitmap) {
434 d.dirty_bitmap = g_malloc(size);
435 } else if (size > allocated_size) {
436 d.dirty_bitmap = g_realloc(d.dirty_bitmap, size);
438 allocated_size = size;
439 memset(d.dirty_bitmap, 0, allocated_size);
443 if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
444 DPRINTF("ioctl failed %d\n", errno);
449 kvm_get_dirty_pages_log_range(section, d.dirty_bitmap);
450 start_addr = mem->start_addr + mem->memory_size;
452 g_free(d.dirty_bitmap);
457 static void kvm_coalesce_mmio_region(MemoryListener *listener,
458 MemoryRegionSection *secion,
459 hwaddr start, hwaddr size)
461 KVMState *s = kvm_state;
463 if (s->coalesced_mmio) {
464 struct kvm_coalesced_mmio_zone zone;
470 (void)kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
474 static void kvm_uncoalesce_mmio_region(MemoryListener *listener,
475 MemoryRegionSection *secion,
476 hwaddr start, hwaddr size)
478 KVMState *s = kvm_state;
480 if (s->coalesced_mmio) {
481 struct kvm_coalesced_mmio_zone zone;
487 (void)kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
491 int kvm_check_extension(KVMState *s, unsigned int extension)
495 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension);
503 static int kvm_check_many_ioeventfds(void)
505 /* Userspace can use ioeventfd for io notification. This requires a host
506 * that supports eventfd(2) and an I/O thread; since eventfd does not
507 * support SIGIO it cannot interrupt the vcpu.
509 * Older kernels have a 6 device limit on the KVM io bus. Find out so we
510 * can avoid creating too many ioeventfds.
512 #if defined(CONFIG_EVENTFD)
515 for (i = 0; i < ARRAY_SIZE(ioeventfds); i++) {
516 ioeventfds[i] = eventfd(0, EFD_CLOEXEC);
517 if (ioeventfds[i] < 0) {
520 ret = kvm_set_ioeventfd_pio_word(ioeventfds[i], 0, i, true);
522 close(ioeventfds[i]);
527 /* Decide whether many devices are supported or not */
528 ret = i == ARRAY_SIZE(ioeventfds);
531 kvm_set_ioeventfd_pio_word(ioeventfds[i], 0, i, false);
532 close(ioeventfds[i]);
540 static const KVMCapabilityInfo *
541 kvm_check_extension_list(KVMState *s, const KVMCapabilityInfo *list)
544 if (!kvm_check_extension(s, list->value)) {
552 static void kvm_set_phys_mem(MemoryRegionSection *section, bool add)
554 KVMState *s = kvm_state;
557 MemoryRegion *mr = section->mr;
558 bool log_dirty = memory_region_is_logging(mr);
559 hwaddr start_addr = section->offset_within_address_space;
560 ram_addr_t size = section->size;
564 /* kvm works in page size chunks, but the function may be called
565 with sub-page size and unaligned start address. */
566 delta = TARGET_PAGE_ALIGN(size) - size;
572 size &= TARGET_PAGE_MASK;
573 if (!size || (start_addr & ~TARGET_PAGE_MASK)) {
577 if (!memory_region_is_ram(mr)) {
581 ram = memory_region_get_ram_ptr(mr) + section->offset_within_region + delta;
584 mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size);
589 if (add && start_addr >= mem->start_addr &&
590 (start_addr + size <= mem->start_addr + mem->memory_size) &&
591 (ram - start_addr == mem->ram - mem->start_addr)) {
592 /* The new slot fits into the existing one and comes with
593 * identical parameters - update flags and done. */
594 kvm_slot_dirty_pages_log_change(mem, log_dirty);
600 if (mem->flags & KVM_MEM_LOG_DIRTY_PAGES) {
601 kvm_physical_sync_dirty_bitmap(section);
604 /* unregister the overlapping slot */
605 mem->memory_size = 0;
606 err = kvm_set_user_memory_region(s, mem);
608 fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
609 __func__, strerror(-err));
613 /* Workaround for older KVM versions: we can't join slots, even not by
614 * unregistering the previous ones and then registering the larger
615 * slot. We have to maintain the existing fragmentation. Sigh.
617 * This workaround assumes that the new slot starts at the same
618 * address as the first existing one. If not or if some overlapping
619 * slot comes around later, we will fail (not seen in practice so far)
620 * - and actually require a recent KVM version. */
621 if (s->broken_set_mem_region &&
622 old.start_addr == start_addr && old.memory_size < size && add) {
623 mem = kvm_alloc_slot(s);
624 mem->memory_size = old.memory_size;
625 mem->start_addr = old.start_addr;
627 mem->flags = kvm_mem_flags(s, log_dirty);
629 err = kvm_set_user_memory_region(s, mem);
631 fprintf(stderr, "%s: error updating slot: %s\n", __func__,
636 start_addr += old.memory_size;
637 ram += old.memory_size;
638 size -= old.memory_size;
642 /* register prefix slot */
643 if (old.start_addr < start_addr) {
644 mem = kvm_alloc_slot(s);
645 mem->memory_size = start_addr - old.start_addr;
646 mem->start_addr = old.start_addr;
648 mem->flags = kvm_mem_flags(s, log_dirty);
650 err = kvm_set_user_memory_region(s, mem);
652 fprintf(stderr, "%s: error registering prefix slot: %s\n",
653 __func__, strerror(-err));
655 fprintf(stderr, "%s: This is probably because your kernel's " \
656 "PAGE_SIZE is too big. Please try to use 4k " \
657 "PAGE_SIZE!\n", __func__);
663 /* register suffix slot */
664 if (old.start_addr + old.memory_size > start_addr + size) {
665 ram_addr_t size_delta;
667 mem = kvm_alloc_slot(s);
668 mem->start_addr = start_addr + size;
669 size_delta = mem->start_addr - old.start_addr;
670 mem->memory_size = old.memory_size - size_delta;
671 mem->ram = old.ram + size_delta;
672 mem->flags = kvm_mem_flags(s, log_dirty);
674 err = kvm_set_user_memory_region(s, mem);
676 fprintf(stderr, "%s: error registering suffix slot: %s\n",
677 __func__, strerror(-err));
683 /* in case the KVM bug workaround already "consumed" the new slot */
690 mem = kvm_alloc_slot(s);
691 mem->memory_size = size;
692 mem->start_addr = start_addr;
694 mem->flags = kvm_mem_flags(s, log_dirty);
696 err = kvm_set_user_memory_region(s, mem);
698 fprintf(stderr, "%s: error registering slot: %s\n", __func__,
704 static void kvm_region_add(MemoryListener *listener,
705 MemoryRegionSection *section)
707 kvm_set_phys_mem(section, true);
710 static void kvm_region_del(MemoryListener *listener,
711 MemoryRegionSection *section)
713 kvm_set_phys_mem(section, false);
716 static void kvm_log_sync(MemoryListener *listener,
717 MemoryRegionSection *section)
721 r = kvm_physical_sync_dirty_bitmap(section);
727 static void kvm_log_global_start(struct MemoryListener *listener)
731 r = kvm_set_migration_log(1);
735 static void kvm_log_global_stop(struct MemoryListener *listener)
739 r = kvm_set_migration_log(0);
743 static void kvm_mem_ioeventfd_add(MemoryListener *listener,
744 MemoryRegionSection *section,
745 bool match_data, uint64_t data,
748 int fd = event_notifier_get_fd(e);
751 assert(match_data && section->size <= 8);
753 r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
754 data, true, section->size);
760 static void kvm_mem_ioeventfd_del(MemoryListener *listener,
761 MemoryRegionSection *section,
762 bool match_data, uint64_t data,
765 int fd = event_notifier_get_fd(e);
768 r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
769 data, false, section->size);
775 static void kvm_io_ioeventfd_add(MemoryListener *listener,
776 MemoryRegionSection *section,
777 bool match_data, uint64_t data,
780 int fd = event_notifier_get_fd(e);
783 assert(match_data && section->size == 2);
785 r = kvm_set_ioeventfd_pio_word(fd, section->offset_within_address_space,
792 static void kvm_io_ioeventfd_del(MemoryListener *listener,
793 MemoryRegionSection *section,
794 bool match_data, uint64_t data,
798 int fd = event_notifier_get_fd(e);
801 r = kvm_set_ioeventfd_pio_word(fd, section->offset_within_address_space,
808 static MemoryListener kvm_memory_listener = {
809 .region_add = kvm_region_add,
810 .region_del = kvm_region_del,
811 .log_start = kvm_log_start,
812 .log_stop = kvm_log_stop,
813 .log_sync = kvm_log_sync,
814 .log_global_start = kvm_log_global_start,
815 .log_global_stop = kvm_log_global_stop,
816 .eventfd_add = kvm_mem_ioeventfd_add,
817 .eventfd_del = kvm_mem_ioeventfd_del,
818 .coalesced_mmio_add = kvm_coalesce_mmio_region,
819 .coalesced_mmio_del = kvm_uncoalesce_mmio_region,
823 static MemoryListener kvm_io_listener = {
824 .eventfd_add = kvm_io_ioeventfd_add,
825 .eventfd_del = kvm_io_ioeventfd_del,
829 static void kvm_handle_interrupt(CPUArchState *env, int mask)
831 CPUState *cpu = ENV_GET_CPU(env);
833 env->interrupt_request |= mask;
835 if (!qemu_cpu_is_self(cpu)) {
840 int kvm_set_irq(KVMState *s, int irq, int level)
842 struct kvm_irq_level event;
845 assert(kvm_async_interrupts_enabled());
849 ret = kvm_vm_ioctl(s, s->irq_set_ioctl, &event);
851 perror("kvm_set_irq");
855 return (s->irq_set_ioctl == KVM_IRQ_LINE) ? 1 : event.status;
858 #ifdef KVM_CAP_IRQ_ROUTING
859 typedef struct KVMMSIRoute {
860 struct kvm_irq_routing_entry kroute;
861 QTAILQ_ENTRY(KVMMSIRoute) entry;
864 static void set_gsi(KVMState *s, unsigned int gsi)
866 s->used_gsi_bitmap[gsi / 32] |= 1U << (gsi % 32);
869 static void clear_gsi(KVMState *s, unsigned int gsi)
871 s->used_gsi_bitmap[gsi / 32] &= ~(1U << (gsi % 32));
874 static void kvm_init_irq_routing(KVMState *s)
878 gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING);
880 unsigned int gsi_bits, i;
882 /* Round up so we can search ints using ffs */
883 gsi_bits = ALIGN(gsi_count, 32);
884 s->used_gsi_bitmap = g_malloc0(gsi_bits / 8);
885 s->gsi_count = gsi_count;
887 /* Mark any over-allocated bits as already in use */
888 for (i = gsi_count; i < gsi_bits; i++) {
893 s->irq_routes = g_malloc0(sizeof(*s->irq_routes));
894 s->nr_allocated_irq_routes = 0;
896 if (!s->direct_msi) {
897 for (i = 0; i < KVM_MSI_HASHTAB_SIZE; i++) {
898 QTAILQ_INIT(&s->msi_hashtab[i]);
902 kvm_arch_init_irq_routing(s);
905 static void kvm_irqchip_commit_routes(KVMState *s)
909 s->irq_routes->flags = 0;
910 ret = kvm_vm_ioctl(s, KVM_SET_GSI_ROUTING, s->irq_routes);
914 static void kvm_add_routing_entry(KVMState *s,
915 struct kvm_irq_routing_entry *entry)
917 struct kvm_irq_routing_entry *new;
920 if (s->irq_routes->nr == s->nr_allocated_irq_routes) {
921 n = s->nr_allocated_irq_routes * 2;
925 size = sizeof(struct kvm_irq_routing);
926 size += n * sizeof(*new);
927 s->irq_routes = g_realloc(s->irq_routes, size);
928 s->nr_allocated_irq_routes = n;
930 n = s->irq_routes->nr++;
931 new = &s->irq_routes->entries[n];
932 memset(new, 0, sizeof(*new));
933 new->gsi = entry->gsi;
934 new->type = entry->type;
935 new->flags = entry->flags;
938 set_gsi(s, entry->gsi);
940 kvm_irqchip_commit_routes(s);
943 static int kvm_update_routing_entry(KVMState *s,
944 struct kvm_irq_routing_entry *new_entry)
946 struct kvm_irq_routing_entry *entry;
949 for (n = 0; n < s->irq_routes->nr; n++) {
950 entry = &s->irq_routes->entries[n];
951 if (entry->gsi != new_entry->gsi) {
955 entry->type = new_entry->type;
956 entry->flags = new_entry->flags;
957 entry->u = new_entry->u;
959 kvm_irqchip_commit_routes(s);
967 void kvm_irqchip_add_irq_route(KVMState *s, int irq, int irqchip, int pin)
969 struct kvm_irq_routing_entry e;
971 assert(pin < s->gsi_count);
974 e.type = KVM_IRQ_ROUTING_IRQCHIP;
976 e.u.irqchip.irqchip = irqchip;
977 e.u.irqchip.pin = pin;
978 kvm_add_routing_entry(s, &e);
981 void kvm_irqchip_release_virq(KVMState *s, int virq)
983 struct kvm_irq_routing_entry *e;
986 for (i = 0; i < s->irq_routes->nr; i++) {
987 e = &s->irq_routes->entries[i];
988 if (e->gsi == virq) {
990 *e = s->irq_routes->entries[s->irq_routes->nr];
995 kvm_irqchip_commit_routes(s);
998 static unsigned int kvm_hash_msi(uint32_t data)
1000 /* This is optimized for IA32 MSI layout. However, no other arch shall
1001 * repeat the mistake of not providing a direct MSI injection API. */
1005 static void kvm_flush_dynamic_msi_routes(KVMState *s)
1007 KVMMSIRoute *route, *next;
1010 for (hash = 0; hash < KVM_MSI_HASHTAB_SIZE; hash++) {
1011 QTAILQ_FOREACH_SAFE(route, &s->msi_hashtab[hash], entry, next) {
1012 kvm_irqchip_release_virq(s, route->kroute.gsi);
1013 QTAILQ_REMOVE(&s->msi_hashtab[hash], route, entry);
1019 static int kvm_irqchip_get_virq(KVMState *s)
1021 uint32_t *word = s->used_gsi_bitmap;
1022 int max_words = ALIGN(s->gsi_count, 32) / 32;
1027 /* Return the lowest unused GSI in the bitmap */
1028 for (i = 0; i < max_words; i++) {
1029 bit = ffs(~word[i]);
1034 return bit - 1 + i * 32;
1036 if (!s->direct_msi && retry) {
1038 kvm_flush_dynamic_msi_routes(s);
1045 static KVMMSIRoute *kvm_lookup_msi_route(KVMState *s, MSIMessage msg)
1047 unsigned int hash = kvm_hash_msi(msg.data);
1050 QTAILQ_FOREACH(route, &s->msi_hashtab[hash], entry) {
1051 if (route->kroute.u.msi.address_lo == (uint32_t)msg.address &&
1052 route->kroute.u.msi.address_hi == (msg.address >> 32) &&
1053 route->kroute.u.msi.data == msg.data) {
1060 int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
1065 if (s->direct_msi) {
1066 msi.address_lo = (uint32_t)msg.address;
1067 msi.address_hi = msg.address >> 32;
1068 msi.data = msg.data;
1070 memset(msi.pad, 0, sizeof(msi.pad));
1072 return kvm_vm_ioctl(s, KVM_SIGNAL_MSI, &msi);
1075 route = kvm_lookup_msi_route(s, msg);
1079 virq = kvm_irqchip_get_virq(s);
1084 route = g_malloc(sizeof(KVMMSIRoute));
1085 route->kroute.gsi = virq;
1086 route->kroute.type = KVM_IRQ_ROUTING_MSI;
1087 route->kroute.flags = 0;
1088 route->kroute.u.msi.address_lo = (uint32_t)msg.address;
1089 route->kroute.u.msi.address_hi = msg.address >> 32;
1090 route->kroute.u.msi.data = msg.data;
1092 kvm_add_routing_entry(s, &route->kroute);
1094 QTAILQ_INSERT_TAIL(&s->msi_hashtab[kvm_hash_msi(msg.data)], route,
1098 assert(route->kroute.type == KVM_IRQ_ROUTING_MSI);
1100 return kvm_set_irq(s, route->kroute.gsi, 1);
1103 int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg)
1105 struct kvm_irq_routing_entry kroute;
1108 if (!kvm_gsi_routing_enabled()) {
1112 virq = kvm_irqchip_get_virq(s);
1118 kroute.type = KVM_IRQ_ROUTING_MSI;
1120 kroute.u.msi.address_lo = (uint32_t)msg.address;
1121 kroute.u.msi.address_hi = msg.address >> 32;
1122 kroute.u.msi.data = msg.data;
1124 kvm_add_routing_entry(s, &kroute);
1129 int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg)
1131 struct kvm_irq_routing_entry kroute;
1133 if (!kvm_irqchip_in_kernel()) {
1138 kroute.type = KVM_IRQ_ROUTING_MSI;
1140 kroute.u.msi.address_lo = (uint32_t)msg.address;
1141 kroute.u.msi.address_hi = msg.address >> 32;
1142 kroute.u.msi.data = msg.data;
1144 return kvm_update_routing_entry(s, &kroute);
1147 static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int virq, bool assign)
1149 struct kvm_irqfd irqfd = {
1152 .flags = assign ? 0 : KVM_IRQFD_FLAG_DEASSIGN,
1155 if (!kvm_irqfds_enabled()) {
1159 return kvm_vm_ioctl(s, KVM_IRQFD, &irqfd);
1162 #else /* !KVM_CAP_IRQ_ROUTING */
1164 static void kvm_init_irq_routing(KVMState *s)
1168 void kvm_irqchip_release_virq(KVMState *s, int virq)
1172 int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
1177 int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg)
1182 static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int virq, bool assign)
1186 #endif /* !KVM_CAP_IRQ_ROUTING */
1188 int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n, int virq)
1190 return kvm_irqchip_assign_irqfd(s, event_notifier_get_fd(n), virq, true);
1193 int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n, int virq)
1195 return kvm_irqchip_assign_irqfd(s, event_notifier_get_fd(n), virq, false);
1198 static int kvm_irqchip_create(KVMState *s)
1200 QemuOptsList *list = qemu_find_opts("machine");
1203 if (QTAILQ_EMPTY(&list->head) ||
1204 !qemu_opt_get_bool(QTAILQ_FIRST(&list->head),
1205 "kernel_irqchip", true) ||
1206 !kvm_check_extension(s, KVM_CAP_IRQCHIP)) {
1210 ret = kvm_vm_ioctl(s, KVM_CREATE_IRQCHIP);
1212 fprintf(stderr, "Create kernel irqchip failed\n");
1216 kvm_kernel_irqchip = true;
1217 /* If we have an in-kernel IRQ chip then we must have asynchronous
1218 * interrupt delivery (though the reverse is not necessarily true)
1220 kvm_async_interrupts_allowed = true;
1222 kvm_init_irq_routing(s);
1227 static int kvm_max_vcpus(KVMState *s)
1231 /* Find number of supported CPUs using the recommended
1232 * procedure from the kernel API documentation to cope with
1233 * older kernels that may be missing capabilities.
1235 ret = kvm_check_extension(s, KVM_CAP_MAX_VCPUS);
1239 ret = kvm_check_extension(s, KVM_CAP_NR_VCPUS);
1249 static const char upgrade_note[] =
1250 "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
1251 "(see http://sourceforge.net/projects/kvm).\n";
1253 const KVMCapabilityInfo *missing_cap;
1258 s = g_malloc0(sizeof(KVMState));
1261 * On systems where the kernel can support different base page
1262 * sizes, host page size may be different from TARGET_PAGE_SIZE,
1263 * even with KVM. TARGET_PAGE_SIZE is assumed to be the minimum
1264 * page size for the system though.
1266 assert(TARGET_PAGE_SIZE <= getpagesize());
1268 #ifdef KVM_CAP_SET_GUEST_DEBUG
1269 QTAILQ_INIT(&s->kvm_sw_breakpoints);
1271 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
1272 s->slots[i].slot = i;
1275 s->fd = qemu_open("/dev/kvm", O_RDWR);
1277 fprintf(stderr, "Could not access KVM kernel module: %m\n");
1282 ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
1283 if (ret < KVM_API_VERSION) {
1287 fprintf(stderr, "kvm version too old\n");
1291 if (ret > KVM_API_VERSION) {
1293 fprintf(stderr, "kvm version not supported\n");
1297 max_vcpus = kvm_max_vcpus(s);
1298 if (smp_cpus > max_vcpus) {
1300 fprintf(stderr, "Number of SMP cpus requested (%d) exceeds max cpus "
1301 "supported by KVM (%d)\n", smp_cpus, max_vcpus);
1305 s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
1308 fprintf(stderr, "Please add the 'switch_amode' kernel parameter to "
1309 "your host kernel command line\n");
1315 missing_cap = kvm_check_extension_list(s, kvm_required_capabilites);
1318 kvm_check_extension_list(s, kvm_arch_required_capabilities);
1322 fprintf(stderr, "kvm does not support %s\n%s",
1323 missing_cap->name, upgrade_note);
1327 s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);
1329 s->broken_set_mem_region = 1;
1330 ret = kvm_check_extension(s, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS);
1332 s->broken_set_mem_region = 0;
1335 #ifdef KVM_CAP_VCPU_EVENTS
1336 s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS);
1339 s->robust_singlestep =
1340 kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP);
1342 #ifdef KVM_CAP_DEBUGREGS
1343 s->debugregs = kvm_check_extension(s, KVM_CAP_DEBUGREGS);
1346 #ifdef KVM_CAP_XSAVE
1347 s->xsave = kvm_check_extension(s, KVM_CAP_XSAVE);
1351 s->xcrs = kvm_check_extension(s, KVM_CAP_XCRS);
1354 #ifdef KVM_CAP_PIT_STATE2
1355 s->pit_state2 = kvm_check_extension(s, KVM_CAP_PIT_STATE2);
1358 #ifdef KVM_CAP_IRQ_ROUTING
1359 s->direct_msi = (kvm_check_extension(s, KVM_CAP_SIGNAL_MSI) > 0);
1362 s->intx_set_mask = kvm_check_extension(s, KVM_CAP_PCI_2_3);
1364 s->irq_set_ioctl = KVM_IRQ_LINE;
1365 if (kvm_check_extension(s, KVM_CAP_IRQ_INJECT_STATUS)) {
1366 s->irq_set_ioctl = KVM_IRQ_LINE_STATUS;
1369 ret = kvm_arch_init(s);
1374 ret = kvm_irqchip_create(s);
1380 memory_listener_register(&kvm_memory_listener, &address_space_memory);
1381 memory_listener_register(&kvm_io_listener, &address_space_io);
1383 s->many_ioeventfds = kvm_check_many_ioeventfds();
1385 cpu_interrupt_handler = kvm_handle_interrupt;
1401 static void kvm_handle_io(uint16_t port, void *data, int direction, int size,
1405 uint8_t *ptr = data;
1407 for (i = 0; i < count; i++) {
1408 if (direction == KVM_EXIT_IO_IN) {
1411 stb_p(ptr, cpu_inb(port));
1414 stw_p(ptr, cpu_inw(port));
1417 stl_p(ptr, cpu_inl(port));
1423 cpu_outb(port, ldub_p(ptr));
1426 cpu_outw(port, lduw_p(ptr));
1429 cpu_outl(port, ldl_p(ptr));
1438 static int kvm_handle_internal_error(CPUArchState *env, struct kvm_run *run)
1440 fprintf(stderr, "KVM internal error.");
1441 if (kvm_check_extension(kvm_state, KVM_CAP_INTERNAL_ERROR_DATA)) {
1444 fprintf(stderr, " Suberror: %d\n", run->internal.suberror);
1445 for (i = 0; i < run->internal.ndata; ++i) {
1446 fprintf(stderr, "extra data[%d]: %"PRIx64"\n",
1447 i, (uint64_t)run->internal.data[i]);
1450 fprintf(stderr, "\n");
1452 if (run->internal.suberror == KVM_INTERNAL_ERROR_EMULATION) {
1453 fprintf(stderr, "emulation failure\n");
1454 if (!kvm_arch_stop_on_emulation_error(env)) {
1455 cpu_dump_state(env, stderr, fprintf, CPU_DUMP_CODE);
1456 return EXCP_INTERRUPT;
1459 /* FIXME: Should trigger a qmp message to let management know
1460 * something went wrong.
1465 void kvm_flush_coalesced_mmio_buffer(void)
1467 KVMState *s = kvm_state;
1469 if (s->coalesced_flush_in_progress) {
1473 s->coalesced_flush_in_progress = true;
1475 if (s->coalesced_mmio_ring) {
1476 struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;
1477 while (ring->first != ring->last) {
1478 struct kvm_coalesced_mmio *ent;
1480 ent = &ring->coalesced_mmio[ring->first];
1482 cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
1484 ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
1488 s->coalesced_flush_in_progress = false;
1491 static void do_kvm_cpu_synchronize_state(void *_env)
1493 CPUArchState *env = _env;
1495 if (!env->kvm_vcpu_dirty) {
1496 kvm_arch_get_registers(env);
1497 env->kvm_vcpu_dirty = 1;
1501 void kvm_cpu_synchronize_state(CPUArchState *env)
1503 CPUState *cpu = ENV_GET_CPU(env);
1505 if (!env->kvm_vcpu_dirty) {
1506 run_on_cpu(cpu, do_kvm_cpu_synchronize_state, env);
1510 void kvm_cpu_synchronize_post_reset(CPUArchState *env)
1512 kvm_arch_put_registers(env, KVM_PUT_RESET_STATE);
1513 env->kvm_vcpu_dirty = 0;
1516 void kvm_cpu_synchronize_post_init(CPUArchState *env)
1518 kvm_arch_put_registers(env, KVM_PUT_FULL_STATE);
1519 env->kvm_vcpu_dirty = 0;
1522 int kvm_cpu_exec(CPUArchState *env)
1524 struct kvm_run *run = env->kvm_run;
1527 DPRINTF("kvm_cpu_exec()\n");
1529 if (kvm_arch_process_async_events(env)) {
1530 env->exit_request = 0;
1535 if (env->kvm_vcpu_dirty) {
1536 kvm_arch_put_registers(env, KVM_PUT_RUNTIME_STATE);
1537 env->kvm_vcpu_dirty = 0;
1540 kvm_arch_pre_run(env, run);
1541 if (env->exit_request) {
1542 DPRINTF("interrupt exit requested\n");
1544 * KVM requires us to reenter the kernel after IO exits to complete
1545 * instruction emulation. This self-signal will ensure that we
1548 qemu_cpu_kick_self();
1550 qemu_mutex_unlock_iothread();
1552 run_ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
1554 qemu_mutex_lock_iothread();
1555 kvm_arch_post_run(env, run);
1558 if (run_ret == -EINTR || run_ret == -EAGAIN) {
1559 DPRINTF("io window exit\n");
1560 ret = EXCP_INTERRUPT;
1563 fprintf(stderr, "error: kvm run failed %s\n",
1564 strerror(-run_ret));
1568 switch (run->exit_reason) {
1570 DPRINTF("handle_io\n");
1571 kvm_handle_io(run->io.port,
1572 (uint8_t *)run + run->io.data_offset,
1579 DPRINTF("handle_mmio\n");
1580 cpu_physical_memory_rw(run->mmio.phys_addr,
1583 run->mmio.is_write);
1586 case KVM_EXIT_IRQ_WINDOW_OPEN:
1587 DPRINTF("irq_window_open\n");
1588 ret = EXCP_INTERRUPT;
1590 case KVM_EXIT_SHUTDOWN:
1591 DPRINTF("shutdown\n");
1592 qemu_system_reset_request();
1593 ret = EXCP_INTERRUPT;
1595 case KVM_EXIT_UNKNOWN:
1596 fprintf(stderr, "KVM: unknown exit, hardware reason %" PRIx64 "\n",
1597 (uint64_t)run->hw.hardware_exit_reason);
1600 case KVM_EXIT_INTERNAL_ERROR:
1601 ret = kvm_handle_internal_error(env, run);
1604 DPRINTF("kvm_arch_handle_exit\n");
1605 ret = kvm_arch_handle_exit(env, run);
1611 cpu_dump_state(env, stderr, fprintf, CPU_DUMP_CODE);
1612 vm_stop(RUN_STATE_INTERNAL_ERROR);
1615 env->exit_request = 0;
1619 int kvm_ioctl(KVMState *s, int type, ...)
1626 arg = va_arg(ap, void *);
1629 ret = ioctl(s->fd, type, arg);
1636 int kvm_vm_ioctl(KVMState *s, int type, ...)
1643 arg = va_arg(ap, void *);
1646 ret = ioctl(s->vmfd, type, arg);
1653 int kvm_vcpu_ioctl(CPUArchState *env, int type, ...)
1660 arg = va_arg(ap, void *);
1663 ret = ioctl(env->kvm_fd, type, arg);
1670 int kvm_has_sync_mmu(void)
1672 return kvm_check_extension(kvm_state, KVM_CAP_SYNC_MMU);
1675 int kvm_has_vcpu_events(void)
1677 return kvm_state->vcpu_events;
1680 int kvm_has_robust_singlestep(void)
1682 return kvm_state->robust_singlestep;
1685 int kvm_has_debugregs(void)
1687 return kvm_state->debugregs;
1690 int kvm_has_xsave(void)
1692 return kvm_state->xsave;
1695 int kvm_has_xcrs(void)
1697 return kvm_state->xcrs;
1700 int kvm_has_pit_state2(void)
1702 return kvm_state->pit_state2;
1705 int kvm_has_many_ioeventfds(void)
1707 if (!kvm_enabled()) {
1710 return kvm_state->many_ioeventfds;
1713 int kvm_has_gsi_routing(void)
1715 #ifdef KVM_CAP_IRQ_ROUTING
1716 return kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING);
1722 int kvm_has_intx_set_mask(void)
1724 return kvm_state->intx_set_mask;
1727 void *kvm_vmalloc(ram_addr_t size)
1732 mem = kvm_arch_vmalloc(size);
1737 return qemu_vmalloc(size);
1740 void kvm_setup_guest_memory(void *start, size_t size)
1742 #ifdef CONFIG_VALGRIND_H
1743 VALGRIND_MAKE_MEM_DEFINED(start, size);
1745 if (!kvm_has_sync_mmu()) {
1746 int ret = qemu_madvise(start, size, QEMU_MADV_DONTFORK);
1749 perror("qemu_madvise");
1751 "Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
1757 #ifdef KVM_CAP_SET_GUEST_DEBUG
1758 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUArchState *env,
1761 struct kvm_sw_breakpoint *bp;
1763 QTAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) {
1771 int kvm_sw_breakpoints_active(CPUArchState *env)
1773 return !QTAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
1776 struct kvm_set_guest_debug_data {
1777 struct kvm_guest_debug dbg;
1782 static void kvm_invoke_set_guest_debug(void *data)
1784 struct kvm_set_guest_debug_data *dbg_data = data;
1785 CPUArchState *env = dbg_data->env;
1787 dbg_data->err = kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg_data->dbg);
1790 int kvm_update_guest_debug(CPUArchState *env, unsigned long reinject_trap)
1792 CPUState *cpu = ENV_GET_CPU(env);
1793 struct kvm_set_guest_debug_data data;
1795 data.dbg.control = reinject_trap;
1797 if (env->singlestep_enabled) {
1798 data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
1800 kvm_arch_update_guest_debug(env, &data.dbg);
1803 run_on_cpu(cpu, kvm_invoke_set_guest_debug, &data);
1807 int kvm_insert_breakpoint(CPUArchState *current_env, target_ulong addr,
1808 target_ulong len, int type)
1810 struct kvm_sw_breakpoint *bp;
1814 if (type == GDB_BREAKPOINT_SW) {
1815 bp = kvm_find_sw_breakpoint(current_env, addr);
1821 bp = g_malloc(sizeof(struct kvm_sw_breakpoint));
1828 err = kvm_arch_insert_sw_breakpoint(current_env, bp);
1834 QTAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints,
1837 err = kvm_arch_insert_hw_breakpoint(addr, len, type);
1843 for (env = first_cpu; env != NULL; env = env->next_cpu) {
1844 err = kvm_update_guest_debug(env, 0);
1852 int kvm_remove_breakpoint(CPUArchState *current_env, target_ulong addr,
1853 target_ulong len, int type)
1855 struct kvm_sw_breakpoint *bp;
1859 if (type == GDB_BREAKPOINT_SW) {
1860 bp = kvm_find_sw_breakpoint(current_env, addr);
1865 if (bp->use_count > 1) {
1870 err = kvm_arch_remove_sw_breakpoint(current_env, bp);
1875 QTAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry);
1878 err = kvm_arch_remove_hw_breakpoint(addr, len, type);
1884 for (env = first_cpu; env != NULL; env = env->next_cpu) {
1885 err = kvm_update_guest_debug(env, 0);
1893 void kvm_remove_all_breakpoints(CPUArchState *current_env)
1895 struct kvm_sw_breakpoint *bp, *next;
1896 KVMState *s = current_env->kvm_state;
1899 QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) {
1900 if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) {
1901 /* Try harder to find a CPU that currently sees the breakpoint. */
1902 for (env = first_cpu; env != NULL; env = env->next_cpu) {
1903 if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) {
1908 QTAILQ_REMOVE(&s->kvm_sw_breakpoints, bp, entry);
1911 kvm_arch_remove_all_hw_breakpoints();
1913 for (env = first_cpu; env != NULL; env = env->next_cpu) {
1914 kvm_update_guest_debug(env, 0);
1918 #else /* !KVM_CAP_SET_GUEST_DEBUG */
1920 int kvm_update_guest_debug(CPUArchState *env, unsigned long reinject_trap)
1925 int kvm_insert_breakpoint(CPUArchState *current_env, target_ulong addr,
1926 target_ulong len, int type)
1931 int kvm_remove_breakpoint(CPUArchState *current_env, target_ulong addr,
1932 target_ulong len, int type)
1937 void kvm_remove_all_breakpoints(CPUArchState *current_env)
1940 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
1942 int kvm_set_signal_mask(CPUArchState *env, const sigset_t *sigset)
1944 struct kvm_signal_mask *sigmask;
1948 return kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, NULL);
1951 sigmask = g_malloc(sizeof(*sigmask) + sizeof(*sigset));
1954 memcpy(sigmask->sigset, sigset, sizeof(*sigset));
1955 r = kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, sigmask);
1961 int kvm_set_ioeventfd_mmio(int fd, uint32_t addr, uint32_t val, bool assign,
1965 struct kvm_ioeventfd iofd;
1967 iofd.datamatch = val;
1970 iofd.flags = KVM_IOEVENTFD_FLAG_DATAMATCH;
1973 if (!kvm_enabled()) {
1978 iofd.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
1981 ret = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &iofd);
1990 int kvm_set_ioeventfd_pio_word(int fd, uint16_t addr, uint16_t val, bool assign)
1992 struct kvm_ioeventfd kick = {
1996 .flags = KVM_IOEVENTFD_FLAG_DATAMATCH | KVM_IOEVENTFD_FLAG_PIO,
2000 if (!kvm_enabled()) {
2004 kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
2006 r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
2013 int kvm_on_sigbus_vcpu(CPUArchState *env, int code, void *addr)
2015 return kvm_arch_on_sigbus_vcpu(env, code, addr);
2018 int kvm_on_sigbus(int code, void *addr)
2020 return kvm_arch_on_sigbus(code, addr);