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"
31 #include "exec-memory.h"
33 /* This check must be after config-host.h is included */
35 #include <sys/eventfd.h>
38 /* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */
39 #define PAGE_SIZE TARGET_PAGE_SIZE
44 #define DPRINTF(fmt, ...) \
45 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
47 #define DPRINTF(fmt, ...) \
51 typedef struct KVMSlot
53 target_phys_addr_t start_addr
;
54 ram_addr_t memory_size
;
60 typedef struct kvm_dirty_log KVMDirtyLog
;
68 struct kvm_coalesced_mmio_ring
*coalesced_mmio_ring
;
69 bool coalesced_flush_in_progress
;
70 int broken_set_mem_region
;
73 int robust_singlestep
;
75 #ifdef KVM_CAP_SET_GUEST_DEBUG
76 struct kvm_sw_breakpoint_head kvm_sw_breakpoints
;
78 int irqchip_in_kernel
;
82 int irqchip_inject_ioctl
;
83 #ifdef KVM_CAP_IRQ_ROUTING
84 struct kvm_irq_routing
*irq_routes
;
85 int nr_allocated_irq_routes
;
86 uint32_t *used_gsi_bitmap
;
93 static const KVMCapabilityInfo kvm_required_capabilites
[] = {
94 KVM_CAP_INFO(USER_MEMORY
),
95 KVM_CAP_INFO(DESTROY_MEMORY_REGION_WORKS
),
99 static KVMSlot
*kvm_alloc_slot(KVMState
*s
)
103 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
104 if (s
->slots
[i
].memory_size
== 0) {
109 fprintf(stderr
, "%s: no free slot available\n", __func__
);
113 static KVMSlot
*kvm_lookup_matching_slot(KVMState
*s
,
114 target_phys_addr_t start_addr
,
115 target_phys_addr_t end_addr
)
119 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
120 KVMSlot
*mem
= &s
->slots
[i
];
122 if (start_addr
== mem
->start_addr
&&
123 end_addr
== mem
->start_addr
+ mem
->memory_size
) {
132 * Find overlapping slot with lowest start address
134 static KVMSlot
*kvm_lookup_overlapping_slot(KVMState
*s
,
135 target_phys_addr_t start_addr
,
136 target_phys_addr_t end_addr
)
138 KVMSlot
*found
= NULL
;
141 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
142 KVMSlot
*mem
= &s
->slots
[i
];
144 if (mem
->memory_size
== 0 ||
145 (found
&& found
->start_addr
< mem
->start_addr
)) {
149 if (end_addr
> mem
->start_addr
&&
150 start_addr
< mem
->start_addr
+ mem
->memory_size
) {
158 int kvm_physical_memory_addr_from_host(KVMState
*s
, void *ram
,
159 target_phys_addr_t
*phys_addr
)
163 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
164 KVMSlot
*mem
= &s
->slots
[i
];
166 if (ram
>= mem
->ram
&& ram
< mem
->ram
+ mem
->memory_size
) {
167 *phys_addr
= mem
->start_addr
+ (ram
- mem
->ram
);
175 static int kvm_set_user_memory_region(KVMState
*s
, KVMSlot
*slot
)
177 struct kvm_userspace_memory_region mem
;
179 mem
.slot
= slot
->slot
;
180 mem
.guest_phys_addr
= slot
->start_addr
;
181 mem
.memory_size
= slot
->memory_size
;
182 mem
.userspace_addr
= (unsigned long)slot
->ram
;
183 mem
.flags
= slot
->flags
;
184 if (s
->migration_log
) {
185 mem
.flags
|= KVM_MEM_LOG_DIRTY_PAGES
;
187 return kvm_vm_ioctl(s
, KVM_SET_USER_MEMORY_REGION
, &mem
);
190 static void kvm_reset_vcpu(void *opaque
)
192 CPUState
*env
= opaque
;
194 kvm_arch_reset_vcpu(env
);
197 int kvm_irqchip_in_kernel(void)
199 return kvm_state
->irqchip_in_kernel
;
202 int kvm_pit_in_kernel(void)
204 return kvm_state
->pit_in_kernel
;
207 int kvm_init_vcpu(CPUState
*env
)
209 KVMState
*s
= kvm_state
;
213 DPRINTF("kvm_init_vcpu\n");
215 ret
= kvm_vm_ioctl(s
, KVM_CREATE_VCPU
, env
->cpu_index
);
217 DPRINTF("kvm_create_vcpu failed\n");
223 env
->kvm_vcpu_dirty
= 1;
225 mmap_size
= kvm_ioctl(s
, KVM_GET_VCPU_MMAP_SIZE
, 0);
228 DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
232 env
->kvm_run
= mmap(NULL
, mmap_size
, PROT_READ
| PROT_WRITE
, MAP_SHARED
,
234 if (env
->kvm_run
== MAP_FAILED
) {
236 DPRINTF("mmap'ing vcpu state failed\n");
240 if (s
->coalesced_mmio
&& !s
->coalesced_mmio_ring
) {
241 s
->coalesced_mmio_ring
=
242 (void *)env
->kvm_run
+ s
->coalesced_mmio
* PAGE_SIZE
;
245 ret
= kvm_arch_init_vcpu(env
);
247 qemu_register_reset(kvm_reset_vcpu
, env
);
248 kvm_arch_reset_vcpu(env
);
255 * dirty pages logging control
258 static int kvm_mem_flags(KVMState
*s
, bool log_dirty
)
260 return log_dirty
? KVM_MEM_LOG_DIRTY_PAGES
: 0;
263 static int kvm_slot_dirty_pages_log_change(KVMSlot
*mem
, bool log_dirty
)
265 KVMState
*s
= kvm_state
;
266 int flags
, mask
= KVM_MEM_LOG_DIRTY_PAGES
;
269 old_flags
= mem
->flags
;
271 flags
= (mem
->flags
& ~mask
) | kvm_mem_flags(s
, log_dirty
);
274 /* If nothing changed effectively, no need to issue ioctl */
275 if (s
->migration_log
) {
276 flags
|= KVM_MEM_LOG_DIRTY_PAGES
;
279 if (flags
== old_flags
) {
283 return kvm_set_user_memory_region(s
, mem
);
286 static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr
,
287 ram_addr_t size
, bool log_dirty
)
289 KVMState
*s
= kvm_state
;
290 KVMSlot
*mem
= kvm_lookup_matching_slot(s
, phys_addr
, phys_addr
+ size
);
293 fprintf(stderr
, "BUG: %s: invalid parameters " TARGET_FMT_plx
"-"
294 TARGET_FMT_plx
"\n", __func__
, phys_addr
,
295 (target_phys_addr_t
)(phys_addr
+ size
- 1));
298 return kvm_slot_dirty_pages_log_change(mem
, log_dirty
);
301 static void kvm_log_start(MemoryListener
*listener
,
302 MemoryRegionSection
*section
)
306 r
= kvm_dirty_pages_log_change(section
->offset_within_address_space
,
307 section
->size
, true);
313 static void kvm_log_stop(MemoryListener
*listener
,
314 MemoryRegionSection
*section
)
318 r
= kvm_dirty_pages_log_change(section
->offset_within_address_space
,
319 section
->size
, false);
325 static int kvm_set_migration_log(int enable
)
327 KVMState
*s
= kvm_state
;
331 s
->migration_log
= enable
;
333 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
336 if (!mem
->memory_size
) {
339 if (!!(mem
->flags
& KVM_MEM_LOG_DIRTY_PAGES
) == enable
) {
342 err
= kvm_set_user_memory_region(s
, mem
);
350 /* get kvm's dirty pages bitmap and update qemu's */
351 static int kvm_get_dirty_pages_log_range(MemoryRegionSection
*section
,
352 unsigned long *bitmap
)
355 unsigned long page_number
, c
;
356 target_phys_addr_t addr
, addr1
;
357 unsigned int len
= ((section
->size
/ TARGET_PAGE_SIZE
) + HOST_LONG_BITS
- 1) / HOST_LONG_BITS
;
360 * bitmap-traveling is faster than memory-traveling (for addr...)
361 * especially when most of the memory is not dirty.
363 for (i
= 0; i
< len
; i
++) {
364 if (bitmap
[i
] != 0) {
365 c
= leul_to_cpu(bitmap
[i
]);
369 page_number
= i
* HOST_LONG_BITS
+ j
;
370 addr1
= page_number
* TARGET_PAGE_SIZE
;
371 addr
= section
->offset_within_region
+ addr1
;
372 memory_region_set_dirty(section
->mr
, addr
, TARGET_PAGE_SIZE
);
379 #define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
382 * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
383 * This function updates qemu's dirty bitmap using
384 * memory_region_set_dirty(). This means all bits are set
387 * @start_add: start of logged region.
388 * @end_addr: end of logged region.
390 static int kvm_physical_sync_dirty_bitmap(MemoryRegionSection
*section
)
392 KVMState
*s
= kvm_state
;
393 unsigned long size
, allocated_size
= 0;
397 target_phys_addr_t start_addr
= section
->offset_within_address_space
;
398 target_phys_addr_t end_addr
= start_addr
+ section
->size
;
400 d
.dirty_bitmap
= NULL
;
401 while (start_addr
< end_addr
) {
402 mem
= kvm_lookup_overlapping_slot(s
, start_addr
, end_addr
);
407 /* XXX bad kernel interface alert
408 * For dirty bitmap, kernel allocates array of size aligned to
409 * bits-per-long. But for case when the kernel is 64bits and
410 * the userspace is 32bits, userspace can't align to the same
411 * bits-per-long, since sizeof(long) is different between kernel
412 * and user space. This way, userspace will provide buffer which
413 * may be 4 bytes less than the kernel will use, resulting in
414 * userspace memory corruption (which is not detectable by valgrind
415 * too, in most cases).
416 * So for now, let's align to 64 instead of HOST_LONG_BITS here, in
417 * a hope that sizeof(long) wont become >8 any time soon.
419 size
= ALIGN(((mem
->memory_size
) >> TARGET_PAGE_BITS
),
420 /*HOST_LONG_BITS*/ 64) / 8;
421 if (!d
.dirty_bitmap
) {
422 d
.dirty_bitmap
= g_malloc(size
);
423 } else if (size
> allocated_size
) {
424 d
.dirty_bitmap
= g_realloc(d
.dirty_bitmap
, size
);
426 allocated_size
= size
;
427 memset(d
.dirty_bitmap
, 0, allocated_size
);
431 if (kvm_vm_ioctl(s
, KVM_GET_DIRTY_LOG
, &d
) == -1) {
432 DPRINTF("ioctl failed %d\n", errno
);
437 kvm_get_dirty_pages_log_range(section
, d
.dirty_bitmap
);
438 start_addr
= mem
->start_addr
+ mem
->memory_size
;
440 g_free(d
.dirty_bitmap
);
445 int kvm_coalesce_mmio_region(target_phys_addr_t start
, ram_addr_t size
)
448 KVMState
*s
= kvm_state
;
450 if (s
->coalesced_mmio
) {
451 struct kvm_coalesced_mmio_zone zone
;
456 ret
= kvm_vm_ioctl(s
, KVM_REGISTER_COALESCED_MMIO
, &zone
);
462 int kvm_uncoalesce_mmio_region(target_phys_addr_t start
, ram_addr_t size
)
465 KVMState
*s
= kvm_state
;
467 if (s
->coalesced_mmio
) {
468 struct kvm_coalesced_mmio_zone zone
;
473 ret
= kvm_vm_ioctl(s
, KVM_UNREGISTER_COALESCED_MMIO
, &zone
);
479 int kvm_check_extension(KVMState
*s
, unsigned int extension
)
483 ret
= kvm_ioctl(s
, KVM_CHECK_EXTENSION
, extension
);
491 static int kvm_check_many_ioeventfds(void)
493 /* Userspace can use ioeventfd for io notification. This requires a host
494 * that supports eventfd(2) and an I/O thread; since eventfd does not
495 * support SIGIO it cannot interrupt the vcpu.
497 * Older kernels have a 6 device limit on the KVM io bus. Find out so we
498 * can avoid creating too many ioeventfds.
500 #if defined(CONFIG_EVENTFD)
503 for (i
= 0; i
< ARRAY_SIZE(ioeventfds
); i
++) {
504 ioeventfds
[i
] = eventfd(0, EFD_CLOEXEC
);
505 if (ioeventfds
[i
] < 0) {
508 ret
= kvm_set_ioeventfd_pio_word(ioeventfds
[i
], 0, i
, true);
510 close(ioeventfds
[i
]);
515 /* Decide whether many devices are supported or not */
516 ret
= i
== ARRAY_SIZE(ioeventfds
);
519 kvm_set_ioeventfd_pio_word(ioeventfds
[i
], 0, i
, false);
520 close(ioeventfds
[i
]);
528 static const KVMCapabilityInfo
*
529 kvm_check_extension_list(KVMState
*s
, const KVMCapabilityInfo
*list
)
532 if (!kvm_check_extension(s
, list
->value
)) {
540 static void kvm_set_phys_mem(MemoryRegionSection
*section
, bool add
)
542 KVMState
*s
= kvm_state
;
545 MemoryRegion
*mr
= section
->mr
;
546 bool log_dirty
= memory_region_is_logging(mr
);
547 target_phys_addr_t start_addr
= section
->offset_within_address_space
;
548 ram_addr_t size
= section
->size
;
551 /* kvm works in page size chunks, but the function may be called
552 with sub-page size and unaligned start address. */
553 size
= TARGET_PAGE_ALIGN(size
);
554 start_addr
= TARGET_PAGE_ALIGN(start_addr
);
556 if (!memory_region_is_ram(mr
)) {
560 ram
= memory_region_get_ram_ptr(mr
) + section
->offset_within_region
;
563 mem
= kvm_lookup_overlapping_slot(s
, start_addr
, start_addr
+ size
);
568 if (add
&& start_addr
>= mem
->start_addr
&&
569 (start_addr
+ size
<= mem
->start_addr
+ mem
->memory_size
) &&
570 (ram
- start_addr
== mem
->ram
- mem
->start_addr
)) {
571 /* The new slot fits into the existing one and comes with
572 * identical parameters - update flags and done. */
573 kvm_slot_dirty_pages_log_change(mem
, log_dirty
);
579 if (mem
->flags
& KVM_MEM_LOG_DIRTY_PAGES
) {
580 kvm_physical_sync_dirty_bitmap(section
);
583 /* unregister the overlapping slot */
584 mem
->memory_size
= 0;
585 err
= kvm_set_user_memory_region(s
, mem
);
587 fprintf(stderr
, "%s: error unregistering overlapping slot: %s\n",
588 __func__
, strerror(-err
));
592 /* Workaround for older KVM versions: we can't join slots, even not by
593 * unregistering the previous ones and then registering the larger
594 * slot. We have to maintain the existing fragmentation. Sigh.
596 * This workaround assumes that the new slot starts at the same
597 * address as the first existing one. If not or if some overlapping
598 * slot comes around later, we will fail (not seen in practice so far)
599 * - and actually require a recent KVM version. */
600 if (s
->broken_set_mem_region
&&
601 old
.start_addr
== start_addr
&& old
.memory_size
< size
&& add
) {
602 mem
= kvm_alloc_slot(s
);
603 mem
->memory_size
= old
.memory_size
;
604 mem
->start_addr
= old
.start_addr
;
606 mem
->flags
= kvm_mem_flags(s
, log_dirty
);
608 err
= kvm_set_user_memory_region(s
, mem
);
610 fprintf(stderr
, "%s: error updating slot: %s\n", __func__
,
615 start_addr
+= old
.memory_size
;
616 ram
+= old
.memory_size
;
617 size
-= old
.memory_size
;
621 /* register prefix slot */
622 if (old
.start_addr
< start_addr
) {
623 mem
= kvm_alloc_slot(s
);
624 mem
->memory_size
= start_addr
- old
.start_addr
;
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 registering prefix slot: %s\n",
632 __func__
, strerror(-err
));
634 fprintf(stderr
, "%s: This is probably because your kernel's " \
635 "PAGE_SIZE is too big. Please try to use 4k " \
636 "PAGE_SIZE!\n", __func__
);
642 /* register suffix slot */
643 if (old
.start_addr
+ old
.memory_size
> start_addr
+ size
) {
644 ram_addr_t size_delta
;
646 mem
= kvm_alloc_slot(s
);
647 mem
->start_addr
= start_addr
+ size
;
648 size_delta
= mem
->start_addr
- old
.start_addr
;
649 mem
->memory_size
= old
.memory_size
- size_delta
;
650 mem
->ram
= old
.ram
+ size_delta
;
651 mem
->flags
= kvm_mem_flags(s
, log_dirty
);
653 err
= kvm_set_user_memory_region(s
, mem
);
655 fprintf(stderr
, "%s: error registering suffix slot: %s\n",
656 __func__
, strerror(-err
));
662 /* in case the KVM bug workaround already "consumed" the new slot */
669 mem
= kvm_alloc_slot(s
);
670 mem
->memory_size
= size
;
671 mem
->start_addr
= start_addr
;
673 mem
->flags
= kvm_mem_flags(s
, log_dirty
);
675 err
= kvm_set_user_memory_region(s
, mem
);
677 fprintf(stderr
, "%s: error registering slot: %s\n", __func__
,
683 static void kvm_begin(MemoryListener
*listener
)
687 static void kvm_commit(MemoryListener
*listener
)
691 static void kvm_region_add(MemoryListener
*listener
,
692 MemoryRegionSection
*section
)
694 kvm_set_phys_mem(section
, true);
697 static void kvm_region_del(MemoryListener
*listener
,
698 MemoryRegionSection
*section
)
700 kvm_set_phys_mem(section
, false);
703 static void kvm_region_nop(MemoryListener
*listener
,
704 MemoryRegionSection
*section
)
708 static void kvm_log_sync(MemoryListener
*listener
,
709 MemoryRegionSection
*section
)
713 r
= kvm_physical_sync_dirty_bitmap(section
);
719 static void kvm_log_global_start(struct MemoryListener
*listener
)
723 r
= kvm_set_migration_log(1);
727 static void kvm_log_global_stop(struct MemoryListener
*listener
)
731 r
= kvm_set_migration_log(0);
735 static void kvm_mem_ioeventfd_add(MemoryRegionSection
*section
,
736 bool match_data
, uint64_t data
, int fd
)
740 assert(match_data
&& section
->size
== 4);
742 r
= kvm_set_ioeventfd_mmio_long(fd
, section
->offset_within_address_space
,
749 static void kvm_mem_ioeventfd_del(MemoryRegionSection
*section
,
750 bool match_data
, uint64_t data
, int fd
)
754 r
= kvm_set_ioeventfd_mmio_long(fd
, section
->offset_within_address_space
,
761 static void kvm_io_ioeventfd_add(MemoryRegionSection
*section
,
762 bool match_data
, uint64_t data
, int fd
)
766 assert(match_data
&& section
->size
== 2);
768 r
= kvm_set_ioeventfd_pio_word(fd
, section
->offset_within_address_space
,
775 static void kvm_io_ioeventfd_del(MemoryRegionSection
*section
,
776 bool match_data
, uint64_t data
, int fd
)
781 r
= kvm_set_ioeventfd_pio_word(fd
, section
->offset_within_address_space
,
788 static void kvm_eventfd_add(MemoryListener
*listener
,
789 MemoryRegionSection
*section
,
790 bool match_data
, uint64_t data
, int fd
)
792 if (section
->address_space
== get_system_memory()) {
793 kvm_mem_ioeventfd_add(section
, match_data
, data
, fd
);
795 kvm_io_ioeventfd_add(section
, match_data
, data
, fd
);
799 static void kvm_eventfd_del(MemoryListener
*listener
,
800 MemoryRegionSection
*section
,
801 bool match_data
, uint64_t data
, int fd
)
803 if (section
->address_space
== get_system_memory()) {
804 kvm_mem_ioeventfd_del(section
, match_data
, data
, fd
);
806 kvm_io_ioeventfd_del(section
, match_data
, data
, fd
);
810 static MemoryListener kvm_memory_listener
= {
812 .commit
= kvm_commit
,
813 .region_add
= kvm_region_add
,
814 .region_del
= kvm_region_del
,
815 .region_nop
= kvm_region_nop
,
816 .log_start
= kvm_log_start
,
817 .log_stop
= kvm_log_stop
,
818 .log_sync
= kvm_log_sync
,
819 .log_global_start
= kvm_log_global_start
,
820 .log_global_stop
= kvm_log_global_stop
,
821 .eventfd_add
= kvm_eventfd_add
,
822 .eventfd_del
= kvm_eventfd_del
,
826 static void kvm_handle_interrupt(CPUState
*env
, int mask
)
828 env
->interrupt_request
|= mask
;
830 if (!qemu_cpu_is_self(env
)) {
835 int kvm_irqchip_set_irq(KVMState
*s
, int irq
, int level
)
837 struct kvm_irq_level event
;
840 assert(s
->irqchip_in_kernel
);
844 ret
= kvm_vm_ioctl(s
, s
->irqchip_inject_ioctl
, &event
);
846 perror("kvm_set_irqchip_line");
850 return (s
->irqchip_inject_ioctl
== KVM_IRQ_LINE
) ? 1 : event
.status
;
853 #ifdef KVM_CAP_IRQ_ROUTING
854 static void set_gsi(KVMState
*s
, unsigned int gsi
)
856 assert(gsi
< s
->max_gsi
);
858 s
->used_gsi_bitmap
[gsi
/ 32] |= 1U << (gsi
% 32);
861 static void kvm_init_irq_routing(KVMState
*s
)
865 gsi_count
= kvm_check_extension(s
, KVM_CAP_IRQ_ROUTING
);
867 unsigned int gsi_bits
, i
;
869 /* Round up so we can search ints using ffs */
870 gsi_bits
= (gsi_count
+ 31) / 32;
871 s
->used_gsi_bitmap
= g_malloc0(gsi_bits
/ 8);
872 s
->max_gsi
= gsi_bits
;
874 /* Mark any over-allocated bits as already in use */
875 for (i
= gsi_count
; i
< gsi_bits
; i
++) {
880 s
->irq_routes
= g_malloc0(sizeof(*s
->irq_routes
));
881 s
->nr_allocated_irq_routes
= 0;
883 kvm_arch_init_irq_routing(s
);
886 static void kvm_add_routing_entry(KVMState
*s
,
887 struct kvm_irq_routing_entry
*entry
)
889 struct kvm_irq_routing_entry
*new;
892 if (s
->irq_routes
->nr
== s
->nr_allocated_irq_routes
) {
893 n
= s
->nr_allocated_irq_routes
* 2;
897 size
= sizeof(struct kvm_irq_routing
);
898 size
+= n
* sizeof(*new);
899 s
->irq_routes
= g_realloc(s
->irq_routes
, size
);
900 s
->nr_allocated_irq_routes
= n
;
902 n
= s
->irq_routes
->nr
++;
903 new = &s
->irq_routes
->entries
[n
];
904 memset(new, 0, sizeof(*new));
905 new->gsi
= entry
->gsi
;
906 new->type
= entry
->type
;
907 new->flags
= entry
->flags
;
910 set_gsi(s
, entry
->gsi
);
913 void kvm_irqchip_add_route(KVMState
*s
, int irq
, int irqchip
, int pin
)
915 struct kvm_irq_routing_entry e
;
918 e
.type
= KVM_IRQ_ROUTING_IRQCHIP
;
920 e
.u
.irqchip
.irqchip
= irqchip
;
921 e
.u
.irqchip
.pin
= pin
;
922 kvm_add_routing_entry(s
, &e
);
925 int kvm_irqchip_commit_routes(KVMState
*s
)
927 s
->irq_routes
->flags
= 0;
928 return kvm_vm_ioctl(s
, KVM_SET_GSI_ROUTING
, s
->irq_routes
);
931 #else /* !KVM_CAP_IRQ_ROUTING */
933 static void kvm_init_irq_routing(KVMState
*s
)
936 #endif /* !KVM_CAP_IRQ_ROUTING */
938 static int kvm_irqchip_create(KVMState
*s
)
940 QemuOptsList
*list
= qemu_find_opts("machine");
943 if (QTAILQ_EMPTY(&list
->head
) ||
944 !qemu_opt_get_bool(QTAILQ_FIRST(&list
->head
),
945 "kernel_irqchip", false) ||
946 !kvm_check_extension(s
, KVM_CAP_IRQCHIP
)) {
950 ret
= kvm_vm_ioctl(s
, KVM_CREATE_IRQCHIP
);
952 fprintf(stderr
, "Create kernel irqchip failed\n");
956 s
->irqchip_inject_ioctl
= KVM_IRQ_LINE
;
957 if (kvm_check_extension(s
, KVM_CAP_IRQ_INJECT_STATUS
)) {
958 s
->irqchip_inject_ioctl
= KVM_IRQ_LINE_STATUS
;
960 s
->irqchip_in_kernel
= 1;
962 kvm_init_irq_routing(s
);
969 static const char upgrade_note
[] =
970 "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
971 "(see http://sourceforge.net/projects/kvm).\n";
973 const KVMCapabilityInfo
*missing_cap
;
977 s
= g_malloc0(sizeof(KVMState
));
979 #ifdef KVM_CAP_SET_GUEST_DEBUG
980 QTAILQ_INIT(&s
->kvm_sw_breakpoints
);
982 for (i
= 0; i
< ARRAY_SIZE(s
->slots
); i
++) {
983 s
->slots
[i
].slot
= i
;
986 s
->fd
= qemu_open("/dev/kvm", O_RDWR
);
988 fprintf(stderr
, "Could not access KVM kernel module: %m\n");
993 ret
= kvm_ioctl(s
, KVM_GET_API_VERSION
, 0);
994 if (ret
< KVM_API_VERSION
) {
998 fprintf(stderr
, "kvm version too old\n");
1002 if (ret
> KVM_API_VERSION
) {
1004 fprintf(stderr
, "kvm version not supported\n");
1008 s
->vmfd
= kvm_ioctl(s
, KVM_CREATE_VM
, 0);
1011 fprintf(stderr
, "Please add the 'switch_amode' kernel parameter to "
1012 "your host kernel command line\n");
1018 missing_cap
= kvm_check_extension_list(s
, kvm_required_capabilites
);
1021 kvm_check_extension_list(s
, kvm_arch_required_capabilities
);
1025 fprintf(stderr
, "kvm does not support %s\n%s",
1026 missing_cap
->name
, upgrade_note
);
1030 s
->coalesced_mmio
= kvm_check_extension(s
, KVM_CAP_COALESCED_MMIO
);
1032 s
->broken_set_mem_region
= 1;
1033 ret
= kvm_check_extension(s
, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
);
1035 s
->broken_set_mem_region
= 0;
1038 #ifdef KVM_CAP_VCPU_EVENTS
1039 s
->vcpu_events
= kvm_check_extension(s
, KVM_CAP_VCPU_EVENTS
);
1042 s
->robust_singlestep
=
1043 kvm_check_extension(s
, KVM_CAP_X86_ROBUST_SINGLESTEP
);
1045 #ifdef KVM_CAP_DEBUGREGS
1046 s
->debugregs
= kvm_check_extension(s
, KVM_CAP_DEBUGREGS
);
1049 #ifdef KVM_CAP_XSAVE
1050 s
->xsave
= kvm_check_extension(s
, KVM_CAP_XSAVE
);
1054 s
->xcrs
= kvm_check_extension(s
, KVM_CAP_XCRS
);
1057 ret
= kvm_arch_init(s
);
1062 ret
= kvm_irqchip_create(s
);
1068 memory_listener_register(&kvm_memory_listener
, NULL
);
1070 s
->many_ioeventfds
= kvm_check_many_ioeventfds();
1072 cpu_interrupt_handler
= kvm_handle_interrupt
;
1090 static void kvm_handle_io(uint16_t port
, void *data
, int direction
, int size
,
1094 uint8_t *ptr
= data
;
1096 for (i
= 0; i
< count
; i
++) {
1097 if (direction
== KVM_EXIT_IO_IN
) {
1100 stb_p(ptr
, cpu_inb(port
));
1103 stw_p(ptr
, cpu_inw(port
));
1106 stl_p(ptr
, cpu_inl(port
));
1112 cpu_outb(port
, ldub_p(ptr
));
1115 cpu_outw(port
, lduw_p(ptr
));
1118 cpu_outl(port
, ldl_p(ptr
));
1127 static int kvm_handle_internal_error(CPUState
*env
, struct kvm_run
*run
)
1129 fprintf(stderr
, "KVM internal error.");
1130 if (kvm_check_extension(kvm_state
, KVM_CAP_INTERNAL_ERROR_DATA
)) {
1133 fprintf(stderr
, " Suberror: %d\n", run
->internal
.suberror
);
1134 for (i
= 0; i
< run
->internal
.ndata
; ++i
) {
1135 fprintf(stderr
, "extra data[%d]: %"PRIx64
"\n",
1136 i
, (uint64_t)run
->internal
.data
[i
]);
1139 fprintf(stderr
, "\n");
1141 if (run
->internal
.suberror
== KVM_INTERNAL_ERROR_EMULATION
) {
1142 fprintf(stderr
, "emulation failure\n");
1143 if (!kvm_arch_stop_on_emulation_error(env
)) {
1144 cpu_dump_state(env
, stderr
, fprintf
, CPU_DUMP_CODE
);
1145 return EXCP_INTERRUPT
;
1148 /* FIXME: Should trigger a qmp message to let management know
1149 * something went wrong.
1154 void kvm_flush_coalesced_mmio_buffer(void)
1156 KVMState
*s
= kvm_state
;
1158 if (s
->coalesced_flush_in_progress
) {
1162 s
->coalesced_flush_in_progress
= true;
1164 if (s
->coalesced_mmio_ring
) {
1165 struct kvm_coalesced_mmio_ring
*ring
= s
->coalesced_mmio_ring
;
1166 while (ring
->first
!= ring
->last
) {
1167 struct kvm_coalesced_mmio
*ent
;
1169 ent
= &ring
->coalesced_mmio
[ring
->first
];
1171 cpu_physical_memory_write(ent
->phys_addr
, ent
->data
, ent
->len
);
1173 ring
->first
= (ring
->first
+ 1) % KVM_COALESCED_MMIO_MAX
;
1177 s
->coalesced_flush_in_progress
= false;
1180 static void do_kvm_cpu_synchronize_state(void *_env
)
1182 CPUState
*env
= _env
;
1184 if (!env
->kvm_vcpu_dirty
) {
1185 kvm_arch_get_registers(env
);
1186 env
->kvm_vcpu_dirty
= 1;
1190 void kvm_cpu_synchronize_state(CPUState
*env
)
1192 if (!env
->kvm_vcpu_dirty
) {
1193 run_on_cpu(env
, do_kvm_cpu_synchronize_state
, env
);
1197 void kvm_cpu_synchronize_post_reset(CPUState
*env
)
1199 kvm_arch_put_registers(env
, KVM_PUT_RESET_STATE
);
1200 env
->kvm_vcpu_dirty
= 0;
1203 void kvm_cpu_synchronize_post_init(CPUState
*env
)
1205 kvm_arch_put_registers(env
, KVM_PUT_FULL_STATE
);
1206 env
->kvm_vcpu_dirty
= 0;
1209 int kvm_cpu_exec(CPUState
*env
)
1211 struct kvm_run
*run
= env
->kvm_run
;
1214 DPRINTF("kvm_cpu_exec()\n");
1216 if (kvm_arch_process_async_events(env
)) {
1217 env
->exit_request
= 0;
1221 cpu_single_env
= env
;
1224 if (env
->kvm_vcpu_dirty
) {
1225 kvm_arch_put_registers(env
, KVM_PUT_RUNTIME_STATE
);
1226 env
->kvm_vcpu_dirty
= 0;
1229 kvm_arch_pre_run(env
, run
);
1230 if (env
->exit_request
) {
1231 DPRINTF("interrupt exit requested\n");
1233 * KVM requires us to reenter the kernel after IO exits to complete
1234 * instruction emulation. This self-signal will ensure that we
1237 qemu_cpu_kick_self();
1239 cpu_single_env
= NULL
;
1240 qemu_mutex_unlock_iothread();
1242 run_ret
= kvm_vcpu_ioctl(env
, KVM_RUN
, 0);
1244 qemu_mutex_lock_iothread();
1245 cpu_single_env
= env
;
1246 kvm_arch_post_run(env
, run
);
1248 kvm_flush_coalesced_mmio_buffer();
1251 if (run_ret
== -EINTR
|| run_ret
== -EAGAIN
) {
1252 DPRINTF("io window exit\n");
1253 ret
= EXCP_INTERRUPT
;
1256 fprintf(stderr
, "error: kvm run failed %s\n",
1257 strerror(-run_ret
));
1261 switch (run
->exit_reason
) {
1263 DPRINTF("handle_io\n");
1264 kvm_handle_io(run
->io
.port
,
1265 (uint8_t *)run
+ run
->io
.data_offset
,
1272 DPRINTF("handle_mmio\n");
1273 cpu_physical_memory_rw(run
->mmio
.phys_addr
,
1276 run
->mmio
.is_write
);
1279 case KVM_EXIT_IRQ_WINDOW_OPEN
:
1280 DPRINTF("irq_window_open\n");
1281 ret
= EXCP_INTERRUPT
;
1283 case KVM_EXIT_SHUTDOWN
:
1284 DPRINTF("shutdown\n");
1285 qemu_system_reset_request();
1286 ret
= EXCP_INTERRUPT
;
1288 case KVM_EXIT_UNKNOWN
:
1289 fprintf(stderr
, "KVM: unknown exit, hardware reason %" PRIx64
"\n",
1290 (uint64_t)run
->hw
.hardware_exit_reason
);
1293 case KVM_EXIT_INTERNAL_ERROR
:
1294 ret
= kvm_handle_internal_error(env
, run
);
1297 DPRINTF("kvm_arch_handle_exit\n");
1298 ret
= kvm_arch_handle_exit(env
, run
);
1304 cpu_dump_state(env
, stderr
, fprintf
, CPU_DUMP_CODE
);
1305 vm_stop(RUN_STATE_INTERNAL_ERROR
);
1308 env
->exit_request
= 0;
1309 cpu_single_env
= NULL
;
1313 int kvm_ioctl(KVMState
*s
, int type
, ...)
1320 arg
= va_arg(ap
, void *);
1323 ret
= ioctl(s
->fd
, type
, arg
);
1330 int kvm_vm_ioctl(KVMState
*s
, int type
, ...)
1337 arg
= va_arg(ap
, void *);
1340 ret
= ioctl(s
->vmfd
, type
, arg
);
1347 int kvm_vcpu_ioctl(CPUState
*env
, int type
, ...)
1354 arg
= va_arg(ap
, void *);
1357 ret
= ioctl(env
->kvm_fd
, type
, arg
);
1364 int kvm_has_sync_mmu(void)
1366 return kvm_check_extension(kvm_state
, KVM_CAP_SYNC_MMU
);
1369 int kvm_has_vcpu_events(void)
1371 return kvm_state
->vcpu_events
;
1374 int kvm_has_robust_singlestep(void)
1376 return kvm_state
->robust_singlestep
;
1379 int kvm_has_debugregs(void)
1381 return kvm_state
->debugregs
;
1384 int kvm_has_xsave(void)
1386 return kvm_state
->xsave
;
1389 int kvm_has_xcrs(void)
1391 return kvm_state
->xcrs
;
1394 int kvm_has_many_ioeventfds(void)
1396 if (!kvm_enabled()) {
1399 return kvm_state
->many_ioeventfds
;
1402 int kvm_has_gsi_routing(void)
1404 #ifdef KVM_CAP_IRQ_ROUTING
1405 return kvm_check_extension(kvm_state
, KVM_CAP_IRQ_ROUTING
);
1411 int kvm_allows_irq0_override(void)
1413 return !kvm_enabled() || !kvm_irqchip_in_kernel() || kvm_has_gsi_routing();
1416 void kvm_setup_guest_memory(void *start
, size_t size
)
1418 if (!kvm_has_sync_mmu()) {
1419 int ret
= qemu_madvise(start
, size
, QEMU_MADV_DONTFORK
);
1422 perror("qemu_madvise");
1424 "Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
1430 #ifdef KVM_CAP_SET_GUEST_DEBUG
1431 struct kvm_sw_breakpoint
*kvm_find_sw_breakpoint(CPUState
*env
,
1434 struct kvm_sw_breakpoint
*bp
;
1436 QTAILQ_FOREACH(bp
, &env
->kvm_state
->kvm_sw_breakpoints
, entry
) {
1444 int kvm_sw_breakpoints_active(CPUState
*env
)
1446 return !QTAILQ_EMPTY(&env
->kvm_state
->kvm_sw_breakpoints
);
1449 struct kvm_set_guest_debug_data
{
1450 struct kvm_guest_debug dbg
;
1455 static void kvm_invoke_set_guest_debug(void *data
)
1457 struct kvm_set_guest_debug_data
*dbg_data
= data
;
1458 CPUState
*env
= dbg_data
->env
;
1460 dbg_data
->err
= kvm_vcpu_ioctl(env
, KVM_SET_GUEST_DEBUG
, &dbg_data
->dbg
);
1463 int kvm_update_guest_debug(CPUState
*env
, unsigned long reinject_trap
)
1465 struct kvm_set_guest_debug_data data
;
1467 data
.dbg
.control
= reinject_trap
;
1469 if (env
->singlestep_enabled
) {
1470 data
.dbg
.control
|= KVM_GUESTDBG_ENABLE
| KVM_GUESTDBG_SINGLESTEP
;
1472 kvm_arch_update_guest_debug(env
, &data
.dbg
);
1475 run_on_cpu(env
, kvm_invoke_set_guest_debug
, &data
);
1479 int kvm_insert_breakpoint(CPUState
*current_env
, target_ulong addr
,
1480 target_ulong len
, int type
)
1482 struct kvm_sw_breakpoint
*bp
;
1486 if (type
== GDB_BREAKPOINT_SW
) {
1487 bp
= kvm_find_sw_breakpoint(current_env
, addr
);
1493 bp
= g_malloc(sizeof(struct kvm_sw_breakpoint
));
1500 err
= kvm_arch_insert_sw_breakpoint(current_env
, bp
);
1506 QTAILQ_INSERT_HEAD(¤t_env
->kvm_state
->kvm_sw_breakpoints
,
1509 err
= kvm_arch_insert_hw_breakpoint(addr
, len
, type
);
1515 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
1516 err
= kvm_update_guest_debug(env
, 0);
1524 int kvm_remove_breakpoint(CPUState
*current_env
, target_ulong addr
,
1525 target_ulong len
, int type
)
1527 struct kvm_sw_breakpoint
*bp
;
1531 if (type
== GDB_BREAKPOINT_SW
) {
1532 bp
= kvm_find_sw_breakpoint(current_env
, addr
);
1537 if (bp
->use_count
> 1) {
1542 err
= kvm_arch_remove_sw_breakpoint(current_env
, bp
);
1547 QTAILQ_REMOVE(¤t_env
->kvm_state
->kvm_sw_breakpoints
, bp
, entry
);
1550 err
= kvm_arch_remove_hw_breakpoint(addr
, len
, type
);
1556 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
1557 err
= kvm_update_guest_debug(env
, 0);
1565 void kvm_remove_all_breakpoints(CPUState
*current_env
)
1567 struct kvm_sw_breakpoint
*bp
, *next
;
1568 KVMState
*s
= current_env
->kvm_state
;
1571 QTAILQ_FOREACH_SAFE(bp
, &s
->kvm_sw_breakpoints
, entry
, next
) {
1572 if (kvm_arch_remove_sw_breakpoint(current_env
, bp
) != 0) {
1573 /* Try harder to find a CPU that currently sees the breakpoint. */
1574 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
1575 if (kvm_arch_remove_sw_breakpoint(env
, bp
) == 0) {
1581 kvm_arch_remove_all_hw_breakpoints();
1583 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
1584 kvm_update_guest_debug(env
, 0);
1588 #else /* !KVM_CAP_SET_GUEST_DEBUG */
1590 int kvm_update_guest_debug(CPUState
*env
, unsigned long reinject_trap
)
1595 int kvm_insert_breakpoint(CPUState
*current_env
, target_ulong addr
,
1596 target_ulong len
, int type
)
1601 int kvm_remove_breakpoint(CPUState
*current_env
, target_ulong addr
,
1602 target_ulong len
, int type
)
1607 void kvm_remove_all_breakpoints(CPUState
*current_env
)
1610 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
1612 int kvm_set_signal_mask(CPUState
*env
, const sigset_t
*sigset
)
1614 struct kvm_signal_mask
*sigmask
;
1618 return kvm_vcpu_ioctl(env
, KVM_SET_SIGNAL_MASK
, NULL
);
1621 sigmask
= g_malloc(sizeof(*sigmask
) + sizeof(*sigset
));
1624 memcpy(sigmask
->sigset
, sigset
, sizeof(*sigset
));
1625 r
= kvm_vcpu_ioctl(env
, KVM_SET_SIGNAL_MASK
, sigmask
);
1631 int kvm_set_ioeventfd_mmio_long(int fd
, uint32_t addr
, uint32_t val
, bool assign
)
1634 struct kvm_ioeventfd iofd
;
1636 iofd
.datamatch
= val
;
1639 iofd
.flags
= KVM_IOEVENTFD_FLAG_DATAMATCH
;
1642 if (!kvm_enabled()) {
1647 iofd
.flags
|= KVM_IOEVENTFD_FLAG_DEASSIGN
;
1650 ret
= kvm_vm_ioctl(kvm_state
, KVM_IOEVENTFD
, &iofd
);
1659 int kvm_set_ioeventfd_pio_word(int fd
, uint16_t addr
, uint16_t val
, bool assign
)
1661 struct kvm_ioeventfd kick
= {
1665 .flags
= KVM_IOEVENTFD_FLAG_DATAMATCH
| KVM_IOEVENTFD_FLAG_PIO
,
1669 if (!kvm_enabled()) {
1673 kick
.flags
|= KVM_IOEVENTFD_FLAG_DEASSIGN
;
1675 r
= kvm_vm_ioctl(kvm_state
, KVM_IOEVENTFD
, &kick
);
1682 int kvm_on_sigbus_vcpu(CPUState
*env
, int code
, void *addr
)
1684 return kvm_arch_on_sigbus_vcpu(env
, code
, addr
);
1687 int kvm_on_sigbus(int code
, void *addr
)
1689 return kvm_arch_on_sigbus(code
, addr
);