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16#include "qemu/osdep.h"
17#include <sys/ioctl.h>
18#include <poll.h>
19
20#include <linux/kvm.h>
21
22#include "qemu/atomic.h"
23#include "qemu/option.h"
24#include "qemu/config-file.h"
25#include "qemu/error-report.h"
26#include "qapi/error.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/runstate.h"
33#include "sysemu/cpus.h"
34#include "qemu/bswap.h"
35#include "exec/memory.h"
36#include "exec/ram_addr.h"
37#include "qemu/event_notifier.h"
38#include "qemu/main-loop.h"
39#include "trace.h"
40#include "hw/irq.h"
41#include "qapi/visitor.h"
42#include "qapi/qapi-types-common.h"
43#include "qapi/qapi-visit-common.h"
44#include "sysemu/reset.h"
45#include "qemu/guest-random.h"
46#include "sysemu/hw_accel.h"
47#include "kvm-cpus.h"
48
49#include "hw/boards.h"
50
51
52#ifdef CONFIG_EVENTFD
53#include <sys/eventfd.h>
54#endif
55
56
57
58
59#ifdef PAGE_SIZE
60#undef PAGE_SIZE
61#endif
62#define PAGE_SIZE qemu_real_host_page_size
63
64
65
66#ifdef DEBUG_KVM
67#define DPRINTF(fmt, ...) \
68 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
69#else
70#define DPRINTF(fmt, ...) \
71 do { } while (0)
72#endif
73
74#define KVM_MSI_HASHTAB_SIZE 256
75
76struct KVMParkedVcpu {
77 unsigned long vcpu_id;
78 int kvm_fd;
79 QLIST_ENTRY(KVMParkedVcpu) node;
80};
81
82enum KVMDirtyRingReaperState {
83 KVM_DIRTY_RING_REAPER_NONE = 0,
84
85 KVM_DIRTY_RING_REAPER_WAIT,
86
87 KVM_DIRTY_RING_REAPER_REAPING,
88};
89
90
91
92
93
94struct KVMDirtyRingReaper {
95
96 QemuThread reaper_thr;
97 volatile uint64_t reaper_iteration;
98 volatile enum KVMDirtyRingReaperState reaper_state;
99};
100
101struct KVMState
102{
103 AccelState parent_obj;
104
105 int nr_slots;
106 int fd;
107 int vmfd;
108 int coalesced_mmio;
109 int coalesced_pio;
110 struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
111 bool coalesced_flush_in_progress;
112 int vcpu_events;
113 int robust_singlestep;
114 int debugregs;
115#ifdef KVM_CAP_SET_GUEST_DEBUG
116 QTAILQ_HEAD(, kvm_sw_breakpoint) kvm_sw_breakpoints;
117#endif
118 int max_nested_state_len;
119 int many_ioeventfds;
120 int intx_set_mask;
121 int kvm_shadow_mem;
122 bool kernel_irqchip_allowed;
123 bool kernel_irqchip_required;
124 OnOffAuto kernel_irqchip_split;
125 bool sync_mmu;
126 uint64_t manual_dirty_log_protect;
127
128
129
130 unsigned irq_set_ioctl;
131 unsigned int sigmask_len;
132 GHashTable *gsimap;
133#ifdef KVM_CAP_IRQ_ROUTING
134 struct kvm_irq_routing *irq_routes;
135 int nr_allocated_irq_routes;
136 unsigned long *used_gsi_bitmap;
137 unsigned int gsi_count;
138 QTAILQ_HEAD(, KVMMSIRoute) msi_hashtab[KVM_MSI_HASHTAB_SIZE];
139#endif
140 KVMMemoryListener memory_listener;
141 QLIST_HEAD(, KVMParkedVcpu) kvm_parked_vcpus;
142
143
144 int nr_as;
145 struct KVMAs {
146 KVMMemoryListener *ml;
147 AddressSpace *as;
148 } *as;
149 uint64_t kvm_dirty_ring_bytes;
150 uint32_t kvm_dirty_ring_size;
151 struct KVMDirtyRingReaper reaper;
152};
153
154KVMState *kvm_state;
155bool kvm_kernel_irqchip;
156bool kvm_split_irqchip;
157bool kvm_async_interrupts_allowed;
158bool kvm_halt_in_kernel_allowed;
159bool kvm_eventfds_allowed;
160bool kvm_irqfds_allowed;
161bool kvm_resamplefds_allowed;
162bool kvm_msi_via_irqfd_allowed;
163bool kvm_gsi_routing_allowed;
164bool kvm_gsi_direct_mapping;
165bool kvm_allowed;
166bool kvm_readonly_mem_allowed;
167bool kvm_vm_attributes_allowed;
168bool kvm_direct_msi_allowed;
169bool kvm_ioeventfd_any_length_allowed;
170bool kvm_msi_use_devid;
171static bool kvm_immediate_exit;
172static hwaddr kvm_max_slot_size = ~0;
173
174static const KVMCapabilityInfo kvm_required_capabilites[] = {
175 KVM_CAP_INFO(USER_MEMORY),
176 KVM_CAP_INFO(DESTROY_MEMORY_REGION_WORKS),
177 KVM_CAP_INFO(JOIN_MEMORY_REGIONS_WORKS),
178 KVM_CAP_LAST_INFO
179};
180
181static NotifierList kvm_irqchip_change_notifiers =
182 NOTIFIER_LIST_INITIALIZER(kvm_irqchip_change_notifiers);
183
184struct KVMResampleFd {
185 int gsi;
186 EventNotifier *resample_event;
187 QLIST_ENTRY(KVMResampleFd) node;
188};
189typedef struct KVMResampleFd KVMResampleFd;
190
191
192
193
194
195static QLIST_HEAD(, KVMResampleFd) kvm_resample_fd_list =
196 QLIST_HEAD_INITIALIZER(kvm_resample_fd_list);
197
198static QemuMutex kml_slots_lock;
199
200#define kvm_slots_lock() qemu_mutex_lock(&kml_slots_lock)
201#define kvm_slots_unlock() qemu_mutex_unlock(&kml_slots_lock)
202
203static void kvm_slot_init_dirty_bitmap(KVMSlot *mem);
204
205static inline void kvm_resample_fd_remove(int gsi)
206{
207 KVMResampleFd *rfd;
208
209 QLIST_FOREACH(rfd, &kvm_resample_fd_list, node) {
210 if (rfd->gsi == gsi) {
211 QLIST_REMOVE(rfd, node);
212 g_free(rfd);
213 break;
214 }
215 }
216}
217
218static inline void kvm_resample_fd_insert(int gsi, EventNotifier *event)
219{
220 KVMResampleFd *rfd = g_new0(KVMResampleFd, 1);
221
222 rfd->gsi = gsi;
223 rfd->resample_event = event;
224
225 QLIST_INSERT_HEAD(&kvm_resample_fd_list, rfd, node);
226}
227
228void kvm_resample_fd_notify(int gsi)
229{
230 KVMResampleFd *rfd;
231
232 QLIST_FOREACH(rfd, &kvm_resample_fd_list, node) {
233 if (rfd->gsi == gsi) {
234 event_notifier_set(rfd->resample_event);
235 trace_kvm_resample_fd_notify(gsi);
236 return;
237 }
238 }
239}
240
241int kvm_get_max_memslots(void)
242{
243 KVMState *s = KVM_STATE(current_accel());
244
245 return s->nr_slots;
246}
247
248
249static KVMSlot *kvm_get_free_slot(KVMMemoryListener *kml)
250{
251 KVMState *s = kvm_state;
252 int i;
253
254 for (i = 0; i < s->nr_slots; i++) {
255 if (kml->slots[i].memory_size == 0) {
256 return &kml->slots[i];
257 }
258 }
259
260 return NULL;
261}
262
263bool kvm_has_free_slot(MachineState *ms)
264{
265 KVMState *s = KVM_STATE(ms->accelerator);
266 bool result;
267 KVMMemoryListener *kml = &s->memory_listener;
268
269 kvm_slots_lock();
270 result = !!kvm_get_free_slot(kml);
271 kvm_slots_unlock();
272
273 return result;
274}
275
276
277static KVMSlot *kvm_alloc_slot(KVMMemoryListener *kml)
278{
279 KVMSlot *slot = kvm_get_free_slot(kml);
280
281 if (slot) {
282 return slot;
283 }
284
285 fprintf(stderr, "%s: no free slot available\n", __func__);
286 abort();
287}
288
289static KVMSlot *kvm_lookup_matching_slot(KVMMemoryListener *kml,
290 hwaddr start_addr,
291 hwaddr size)
292{
293 KVMState *s = kvm_state;
294 int i;
295
296 for (i = 0; i < s->nr_slots; i++) {
297 KVMSlot *mem = &kml->slots[i];
298
299 if (start_addr == mem->start_addr && size == mem->memory_size) {
300 return mem;
301 }
302 }
303
304 return NULL;
305}
306
307
308
309
310
311static hwaddr kvm_align_section(MemoryRegionSection *section,
312 hwaddr *start)
313{
314 hwaddr size = int128_get64(section->size);
315 hwaddr delta, aligned;
316
317
318
319
320 aligned = ROUND_UP(section->offset_within_address_space,
321 qemu_real_host_page_size);
322 delta = aligned - section->offset_within_address_space;
323 *start = aligned;
324 if (delta > size) {
325 return 0;
326 }
327
328 return (size - delta) & qemu_real_host_page_mask;
329}
330
331int kvm_physical_memory_addr_from_host(KVMState *s, void *ram,
332 hwaddr *phys_addr)
333{
334 KVMMemoryListener *kml = &s->memory_listener;
335 int i, ret = 0;
336
337 kvm_slots_lock();
338 for (i = 0; i < s->nr_slots; i++) {
339 KVMSlot *mem = &kml->slots[i];
340
341 if (ram >= mem->ram && ram < mem->ram + mem->memory_size) {
342 *phys_addr = mem->start_addr + (ram - mem->ram);
343 ret = 1;
344 break;
345 }
346 }
347 kvm_slots_unlock();
348
349 return ret;
350}
351
352static int kvm_set_user_memory_region(KVMMemoryListener *kml, KVMSlot *slot, bool new)
353{
354 KVMState *s = kvm_state;
355 struct kvm_userspace_memory_region mem;
356 int ret;
357
358 mem.slot = slot->slot | (kml->as_id << 16);
359 mem.guest_phys_addr = slot->start_addr;
360 mem.userspace_addr = (unsigned long)slot->ram;
361 mem.flags = slot->flags;
362
363 if (slot->memory_size && !new && (mem.flags ^ slot->old_flags) & KVM_MEM_READONLY) {
364
365
366 mem.memory_size = 0;
367 ret = kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
368 if (ret < 0) {
369 goto err;
370 }
371 }
372 mem.memory_size = slot->memory_size;
373 ret = kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
374 slot->old_flags = mem.flags;
375err:
376 trace_kvm_set_user_memory(mem.slot, mem.flags, mem.guest_phys_addr,
377 mem.memory_size, mem.userspace_addr, ret);
378 if (ret < 0) {
379 error_report("%s: KVM_SET_USER_MEMORY_REGION failed, slot=%d,"
380 " start=0x%" PRIx64 ", size=0x%" PRIx64 ": %s",
381 __func__, mem.slot, slot->start_addr,
382 (uint64_t)mem.memory_size, strerror(errno));
383 }
384 return ret;
385}
386
387static int do_kvm_destroy_vcpu(CPUState *cpu)
388{
389 KVMState *s = kvm_state;
390 long mmap_size;
391 struct KVMParkedVcpu *vcpu = NULL;
392 int ret = 0;
393
394 DPRINTF("kvm_destroy_vcpu\n");
395
396 ret = kvm_arch_destroy_vcpu(cpu);
397 if (ret < 0) {
398 goto err;
399 }
400
401 mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
402 if (mmap_size < 0) {
403 ret = mmap_size;
404 DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
405 goto err;
406 }
407
408 ret = munmap(cpu->kvm_run, mmap_size);
409 if (ret < 0) {
410 goto err;
411 }
412
413 if (cpu->kvm_dirty_gfns) {
414 ret = munmap(cpu->kvm_dirty_gfns, s->kvm_dirty_ring_bytes);
415 if (ret < 0) {
416 goto err;
417 }
418 }
419
420 vcpu = g_malloc0(sizeof(*vcpu));
421 vcpu->vcpu_id = kvm_arch_vcpu_id(cpu);
422 vcpu->kvm_fd = cpu->kvm_fd;
423 QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node);
424err:
425 return ret;
426}
427
428void kvm_destroy_vcpu(CPUState *cpu)
429{
430 if (do_kvm_destroy_vcpu(cpu) < 0) {
431 error_report("kvm_destroy_vcpu failed");
432 exit(EXIT_FAILURE);
433 }
434}
435
436static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id)
437{
438 struct KVMParkedVcpu *cpu;
439
440 QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) {
441 if (cpu->vcpu_id == vcpu_id) {
442 int kvm_fd;
443
444 QLIST_REMOVE(cpu, node);
445 kvm_fd = cpu->kvm_fd;
446 g_free(cpu);
447 return kvm_fd;
448 }
449 }
450
451 return kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id);
452}
453
454int kvm_init_vcpu(CPUState *cpu, Error **errp)
455{
456 KVMState *s = kvm_state;
457 long mmap_size;
458 int ret;
459
460 trace_kvm_init_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
461
462 ret = kvm_get_vcpu(s, kvm_arch_vcpu_id(cpu));
463 if (ret < 0) {
464 error_setg_errno(errp, -ret, "kvm_init_vcpu: kvm_get_vcpu failed (%lu)",
465 kvm_arch_vcpu_id(cpu));
466 goto err;
467 }
468
469 cpu->kvm_fd = ret;
470 cpu->kvm_state = s;
471 cpu->vcpu_dirty = true;
472 cpu->dirty_pages = 0;
473
474 mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
475 if (mmap_size < 0) {
476 ret = mmap_size;
477 error_setg_errno(errp, -mmap_size,
478 "kvm_init_vcpu: KVM_GET_VCPU_MMAP_SIZE failed");
479 goto err;
480 }
481
482 cpu->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
483 cpu->kvm_fd, 0);
484 if (cpu->kvm_run == MAP_FAILED) {
485 ret = -errno;
486 error_setg_errno(errp, ret,
487 "kvm_init_vcpu: mmap'ing vcpu state failed (%lu)",
488 kvm_arch_vcpu_id(cpu));
489 goto err;
490 }
491
492 if (s->coalesced_mmio && !s->coalesced_mmio_ring) {
493 s->coalesced_mmio_ring =
494 (void *)cpu->kvm_run + s->coalesced_mmio * PAGE_SIZE;
495 }
496
497 if (s->kvm_dirty_ring_size) {
498
499 cpu->kvm_dirty_gfns = mmap(NULL, s->kvm_dirty_ring_bytes,
500 PROT_READ | PROT_WRITE, MAP_SHARED,
501 cpu->kvm_fd,
502 PAGE_SIZE * KVM_DIRTY_LOG_PAGE_OFFSET);
503 if (cpu->kvm_dirty_gfns == MAP_FAILED) {
504 ret = -errno;
505 DPRINTF("mmap'ing vcpu dirty gfns failed: %d\n", ret);
506 goto err;
507 }
508 }
509
510 ret = kvm_arch_init_vcpu(cpu);
511 if (ret < 0) {
512 error_setg_errno(errp, -ret,
513 "kvm_init_vcpu: kvm_arch_init_vcpu failed (%lu)",
514 kvm_arch_vcpu_id(cpu));
515 }
516err:
517 return ret;
518}
519
520
521
522
523
524static int kvm_mem_flags(MemoryRegion *mr)
525{
526 bool readonly = mr->readonly || memory_region_is_romd(mr);
527 int flags = 0;
528
529 if (memory_region_get_dirty_log_mask(mr) != 0) {
530 flags |= KVM_MEM_LOG_DIRTY_PAGES;
531 }
532 if (readonly && kvm_readonly_mem_allowed) {
533 flags |= KVM_MEM_READONLY;
534 }
535 return flags;
536}
537
538
539static int kvm_slot_update_flags(KVMMemoryListener *kml, KVMSlot *mem,
540 MemoryRegion *mr)
541{
542 mem->flags = kvm_mem_flags(mr);
543
544
545 if (mem->flags == mem->old_flags) {
546 return 0;
547 }
548
549 kvm_slot_init_dirty_bitmap(mem);
550 return kvm_set_user_memory_region(kml, mem, false);
551}
552
553static int kvm_section_update_flags(KVMMemoryListener *kml,
554 MemoryRegionSection *section)
555{
556 hwaddr start_addr, size, slot_size;
557 KVMSlot *mem;
558 int ret = 0;
559
560 size = kvm_align_section(section, &start_addr);
561 if (!size) {
562 return 0;
563 }
564
565 kvm_slots_lock();
566
567 while (size && !ret) {
568 slot_size = MIN(kvm_max_slot_size, size);
569 mem = kvm_lookup_matching_slot(kml, start_addr, slot_size);
570 if (!mem) {
571
572 goto out;
573 }
574
575 ret = kvm_slot_update_flags(kml, mem, section->mr);
576 start_addr += slot_size;
577 size -= slot_size;
578 }
579
580out:
581 kvm_slots_unlock();
582 return ret;
583}
584
585static void kvm_log_start(MemoryListener *listener,
586 MemoryRegionSection *section,
587 int old, int new)
588{
589 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
590 int r;
591
592 if (old != 0) {
593 return;
594 }
595
596 r = kvm_section_update_flags(kml, section);
597 if (r < 0) {
598 abort();
599 }
600}
601
602static void kvm_log_stop(MemoryListener *listener,
603 MemoryRegionSection *section,
604 int old, int new)
605{
606 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
607 int r;
608
609 if (new != 0) {
610 return;
611 }
612
613 r = kvm_section_update_flags(kml, section);
614 if (r < 0) {
615 abort();
616 }
617}
618
619
620static void kvm_slot_sync_dirty_pages(KVMSlot *slot)
621{
622 ram_addr_t start = slot->ram_start_offset;
623 ram_addr_t pages = slot->memory_size / qemu_real_host_page_size;
624
625 cpu_physical_memory_set_dirty_lebitmap(slot->dirty_bmap, start, pages);
626}
627
628static void kvm_slot_reset_dirty_pages(KVMSlot *slot)
629{
630 memset(slot->dirty_bmap, 0, slot->dirty_bmap_size);
631}
632
633#define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
634
635
636static void kvm_slot_init_dirty_bitmap(KVMSlot *mem)
637{
638 if (!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) || mem->dirty_bmap) {
639 return;
640 }
641
642
643
644
645
646
647
648
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650
651
652
653
654
655
656
657
658
659 hwaddr bitmap_size = ALIGN(mem->memory_size / qemu_real_host_page_size,
660 64) / 8;
661 mem->dirty_bmap = g_malloc0(bitmap_size);
662 mem->dirty_bmap_size = bitmap_size;
663}
664
665
666
667
668
669static bool kvm_slot_get_dirty_log(KVMState *s, KVMSlot *slot)
670{
671 struct kvm_dirty_log d = {};
672 int ret;
673
674 d.dirty_bitmap = slot->dirty_bmap;
675 d.slot = slot->slot | (slot->as_id << 16);
676 ret = kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d);
677
678 if (ret == -ENOENT) {
679
680 ret = 0;
681 }
682 if (ret) {
683 error_report_once("%s: KVM_GET_DIRTY_LOG failed with %d",
684 __func__, ret);
685 }
686 return ret == 0;
687}
688
689
690static void kvm_dirty_ring_mark_page(KVMState *s, uint32_t as_id,
691 uint32_t slot_id, uint64_t offset)
692{
693 KVMMemoryListener *kml;
694 KVMSlot *mem;
695
696 if (as_id >= s->nr_as) {
697 return;
698 }
699
700 kml = s->as[as_id].ml;
701 mem = &kml->slots[slot_id];
702
703 if (!mem->memory_size || offset >=
704 (mem->memory_size / qemu_real_host_page_size)) {
705 return;
706 }
707
708 set_bit(offset, mem->dirty_bmap);
709}
710
711static bool dirty_gfn_is_dirtied(struct kvm_dirty_gfn *gfn)
712{
713 return gfn->flags == KVM_DIRTY_GFN_F_DIRTY;
714}
715
716static void dirty_gfn_set_collected(struct kvm_dirty_gfn *gfn)
717{
718 gfn->flags = KVM_DIRTY_GFN_F_RESET;
719}
720
721
722
723
724
725static uint32_t kvm_dirty_ring_reap_one(KVMState *s, CPUState *cpu)
726{
727 struct kvm_dirty_gfn *dirty_gfns = cpu->kvm_dirty_gfns, *cur;
728 uint32_t ring_size = s->kvm_dirty_ring_size;
729 uint32_t count = 0, fetch = cpu->kvm_fetch_index;
730
731 assert(dirty_gfns && ring_size);
732 trace_kvm_dirty_ring_reap_vcpu(cpu->cpu_index);
733
734 while (true) {
735 cur = &dirty_gfns[fetch % ring_size];
736 if (!dirty_gfn_is_dirtied(cur)) {
737 break;
738 }
739 kvm_dirty_ring_mark_page(s, cur->slot >> 16, cur->slot & 0xffff,
740 cur->offset);
741 dirty_gfn_set_collected(cur);
742 trace_kvm_dirty_ring_page(cpu->cpu_index, fetch, cur->offset);
743 fetch++;
744 count++;
745 }
746 cpu->kvm_fetch_index = fetch;
747 cpu->dirty_pages += count;
748
749 return count;
750}
751
752
753static uint64_t kvm_dirty_ring_reap_locked(KVMState *s)
754{
755 int ret;
756 CPUState *cpu;
757 uint64_t total = 0;
758 int64_t stamp;
759
760 stamp = get_clock();
761
762 CPU_FOREACH(cpu) {
763 total += kvm_dirty_ring_reap_one(s, cpu);
764 }
765
766 if (total) {
767 ret = kvm_vm_ioctl(s, KVM_RESET_DIRTY_RINGS);
768 assert(ret == total);
769 }
770
771 stamp = get_clock() - stamp;
772
773 if (total) {
774 trace_kvm_dirty_ring_reap(total, stamp / 1000);
775 }
776
777 return total;
778}
779
780
781
782
783
784static uint64_t kvm_dirty_ring_reap(KVMState *s)
785{
786 uint64_t total;
787
788
789
790
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795
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799
800
801
802
803 kvm_slots_lock();
804 total = kvm_dirty_ring_reap_locked(s);
805 kvm_slots_unlock();
806
807 return total;
808}
809
810static void do_kvm_cpu_synchronize_kick(CPUState *cpu, run_on_cpu_data arg)
811{
812
813}
814
815
816
817
818
819
820static void kvm_cpu_synchronize_kick_all(void)
821{
822 CPUState *cpu;
823
824 CPU_FOREACH(cpu) {
825 run_on_cpu(cpu, do_kvm_cpu_synchronize_kick, RUN_ON_CPU_NULL);
826 }
827}
828
829
830
831
832
833
834
835
836
837static void kvm_dirty_ring_flush(void)
838{
839 trace_kvm_dirty_ring_flush(0);
840
841
842
843
844
845 assert(qemu_mutex_iothread_locked());
846
847
848
849
850 kvm_cpu_synchronize_kick_all();
851 kvm_dirty_ring_reap(kvm_state);
852 trace_kvm_dirty_ring_flush(1);
853}
854
855
856
857
858
859
860
861
862
863
864
865
866static void kvm_physical_sync_dirty_bitmap(KVMMemoryListener *kml,
867 MemoryRegionSection *section)
868{
869 KVMState *s = kvm_state;
870 KVMSlot *mem;
871 hwaddr start_addr, size;
872 hwaddr slot_size;
873
874 size = kvm_align_section(section, &start_addr);
875 while (size) {
876 slot_size = MIN(kvm_max_slot_size, size);
877 mem = kvm_lookup_matching_slot(kml, start_addr, slot_size);
878 if (!mem) {
879
880 return;
881 }
882 if (kvm_slot_get_dirty_log(s, mem)) {
883 kvm_slot_sync_dirty_pages(mem);
884 }
885 start_addr += slot_size;
886 size -= slot_size;
887 }
888}
889
890
891#define KVM_CLEAR_LOG_SHIFT 6
892#define KVM_CLEAR_LOG_ALIGN (qemu_real_host_page_size << KVM_CLEAR_LOG_SHIFT)
893#define KVM_CLEAR_LOG_MASK (-KVM_CLEAR_LOG_ALIGN)
894
895static int kvm_log_clear_one_slot(KVMSlot *mem, int as_id, uint64_t start,
896 uint64_t size)
897{
898 KVMState *s = kvm_state;
899 uint64_t end, bmap_start, start_delta, bmap_npages;
900 struct kvm_clear_dirty_log d;
901 unsigned long *bmap_clear = NULL, psize = qemu_real_host_page_size;
902 int ret;
903
904
905
906
907
908
909 bmap_start = start & KVM_CLEAR_LOG_MASK;
910 start_delta = start - bmap_start;
911 bmap_start /= psize;
912
913
914
915
916
917
918
919 bmap_npages = DIV_ROUND_UP(size + start_delta, KVM_CLEAR_LOG_ALIGN)
920 << KVM_CLEAR_LOG_SHIFT;
921 end = mem->memory_size / psize;
922 if (bmap_npages > end - bmap_start) {
923 bmap_npages = end - bmap_start;
924 }
925 start_delta /= psize;
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949 assert(bmap_start % BITS_PER_LONG == 0);
950
951 assert(mem->dirty_bmap);
952 if (start_delta || bmap_npages - size / psize) {
953
954 bmap_clear = bitmap_new(bmap_npages);
955 bitmap_copy_with_src_offset(bmap_clear, mem->dirty_bmap,
956 bmap_start, start_delta + size / psize);
957
958
959
960
961
962 bitmap_clear(bmap_clear, 0, start_delta);
963 d.dirty_bitmap = bmap_clear;
964 } else {
965
966
967
968
969 d.dirty_bitmap = mem->dirty_bmap + BIT_WORD(bmap_start);
970 }
971
972 d.first_page = bmap_start;
973
974 assert(bmap_npages <= UINT32_MAX);
975 d.num_pages = bmap_npages;
976 d.slot = mem->slot | (as_id << 16);
977
978 ret = kvm_vm_ioctl(s, KVM_CLEAR_DIRTY_LOG, &d);
979 if (ret < 0 && ret != -ENOENT) {
980 error_report("%s: KVM_CLEAR_DIRTY_LOG failed, slot=%d, "
981 "start=0x%"PRIx64", size=0x%"PRIx32", errno=%d",
982 __func__, d.slot, (uint64_t)d.first_page,
983 (uint32_t)d.num_pages, ret);
984 } else {
985 ret = 0;
986 trace_kvm_clear_dirty_log(d.slot, d.first_page, d.num_pages);
987 }
988
989
990
991
992
993
994
995 bitmap_clear(mem->dirty_bmap, bmap_start + start_delta,
996 size / psize);
997
998 g_free(bmap_clear);
999 return ret;
1000}
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013static int kvm_physical_log_clear(KVMMemoryListener *kml,
1014 MemoryRegionSection *section)
1015{
1016 KVMState *s = kvm_state;
1017 uint64_t start, size, offset, count;
1018 KVMSlot *mem;
1019 int ret = 0, i;
1020
1021 if (!s->manual_dirty_log_protect) {
1022
1023 return ret;
1024 }
1025
1026 start = section->offset_within_address_space;
1027 size = int128_get64(section->size);
1028
1029 if (!size) {
1030
1031 return ret;
1032 }
1033
1034 kvm_slots_lock();
1035
1036 for (i = 0; i < s->nr_slots; i++) {
1037 mem = &kml->slots[i];
1038
1039 if (!mem->memory_size ||
1040 mem->start_addr > start + size - 1 ||
1041 start > mem->start_addr + mem->memory_size - 1) {
1042 continue;
1043 }
1044
1045 if (start >= mem->start_addr) {
1046
1047 offset = start - mem->start_addr;
1048 count = MIN(mem->memory_size - offset, size);
1049 } else {
1050
1051 offset = 0;
1052 count = MIN(mem->memory_size, size - (mem->start_addr - start));
1053 }
1054 ret = kvm_log_clear_one_slot(mem, kml->as_id, offset, count);
1055 if (ret < 0) {
1056 break;
1057 }
1058 }
1059
1060 kvm_slots_unlock();
1061
1062 return ret;
1063}
1064
1065static void kvm_coalesce_mmio_region(MemoryListener *listener,
1066 MemoryRegionSection *secion,
1067 hwaddr start, hwaddr size)
1068{
1069 KVMState *s = kvm_state;
1070
1071 if (s->coalesced_mmio) {
1072 struct kvm_coalesced_mmio_zone zone;
1073
1074 zone.addr = start;
1075 zone.size = size;
1076 zone.pad = 0;
1077
1078 (void)kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
1079 }
1080}
1081
1082static void kvm_uncoalesce_mmio_region(MemoryListener *listener,
1083 MemoryRegionSection *secion,
1084 hwaddr start, hwaddr size)
1085{
1086 KVMState *s = kvm_state;
1087
1088 if (s->coalesced_mmio) {
1089 struct kvm_coalesced_mmio_zone zone;
1090
1091 zone.addr = start;
1092 zone.size = size;
1093 zone.pad = 0;
1094
1095 (void)kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
1096 }
1097}
1098
1099static void kvm_coalesce_pio_add(MemoryListener *listener,
1100 MemoryRegionSection *section,
1101 hwaddr start, hwaddr size)
1102{
1103 KVMState *s = kvm_state;
1104
1105 if (s->coalesced_pio) {
1106 struct kvm_coalesced_mmio_zone zone;
1107
1108 zone.addr = start;
1109 zone.size = size;
1110 zone.pio = 1;
1111
1112 (void)kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
1113 }
1114}
1115
1116static void kvm_coalesce_pio_del(MemoryListener *listener,
1117 MemoryRegionSection *section,
1118 hwaddr start, hwaddr size)
1119{
1120 KVMState *s = kvm_state;
1121
1122 if (s->coalesced_pio) {
1123 struct kvm_coalesced_mmio_zone zone;
1124
1125 zone.addr = start;
1126 zone.size = size;
1127 zone.pio = 1;
1128
1129 (void)kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
1130 }
1131}
1132
1133static MemoryListener kvm_coalesced_pio_listener = {
1134 .name = "kvm-coalesced-pio",
1135 .coalesced_io_add = kvm_coalesce_pio_add,
1136 .coalesced_io_del = kvm_coalesce_pio_del,
1137};
1138
1139int kvm_check_extension(KVMState *s, unsigned int extension)
1140{
1141 int ret;
1142
1143 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension);
1144 if (ret < 0) {
1145 ret = 0;
1146 }
1147
1148 return ret;
1149}
1150
1151int kvm_vm_check_extension(KVMState *s, unsigned int extension)
1152{
1153 int ret;
1154
1155 ret = kvm_vm_ioctl(s, KVM_CHECK_EXTENSION, extension);
1156 if (ret < 0) {
1157
1158 ret = kvm_check_extension(s, extension);
1159 }
1160
1161 return ret;
1162}
1163
1164typedef struct HWPoisonPage {
1165 ram_addr_t ram_addr;
1166 QLIST_ENTRY(HWPoisonPage) list;
1167} HWPoisonPage;
1168
1169static QLIST_HEAD(, HWPoisonPage) hwpoison_page_list =
1170 QLIST_HEAD_INITIALIZER(hwpoison_page_list);
1171
1172static void kvm_unpoison_all(void *param)
1173{
1174 HWPoisonPage *page, *next_page;
1175
1176 QLIST_FOREACH_SAFE(page, &hwpoison_page_list, list, next_page) {
1177 QLIST_REMOVE(page, list);
1178 qemu_ram_remap(page->ram_addr, TARGET_PAGE_SIZE);
1179 g_free(page);
1180 }
1181}
1182
1183void kvm_hwpoison_page_add(ram_addr_t ram_addr)
1184{
1185 HWPoisonPage *page;
1186
1187 QLIST_FOREACH(page, &hwpoison_page_list, list) {
1188 if (page->ram_addr == ram_addr) {
1189 return;
1190 }
1191 }
1192 page = g_new(HWPoisonPage, 1);
1193 page->ram_addr = ram_addr;
1194 QLIST_INSERT_HEAD(&hwpoison_page_list, page, list);
1195}
1196
1197static uint32_t adjust_ioeventfd_endianness(uint32_t val, uint32_t size)
1198{
1199#if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
1200
1201
1202
1203
1204
1205 switch (size) {
1206 case 2:
1207 val = bswap16(val);
1208 break;
1209 case 4:
1210 val = bswap32(val);
1211 break;
1212 }
1213#endif
1214 return val;
1215}
1216
1217static int kvm_set_ioeventfd_mmio(int fd, hwaddr addr, uint32_t val,
1218 bool assign, uint32_t size, bool datamatch)
1219{
1220 int ret;
1221 struct kvm_ioeventfd iofd = {
1222 .datamatch = datamatch ? adjust_ioeventfd_endianness(val, size) : 0,
1223 .addr = addr,
1224 .len = size,
1225 .flags = 0,
1226 .fd = fd,
1227 };
1228
1229 trace_kvm_set_ioeventfd_mmio(fd, (uint64_t)addr, val, assign, size,
1230 datamatch);
1231 if (!kvm_enabled()) {
1232 return -ENOSYS;
1233 }
1234
1235 if (datamatch) {
1236 iofd.flags |= KVM_IOEVENTFD_FLAG_DATAMATCH;
1237 }
1238 if (!assign) {
1239 iofd.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
1240 }
1241
1242 ret = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &iofd);
1243
1244 if (ret < 0) {
1245 return -errno;
1246 }
1247
1248 return 0;
1249}
1250
1251static int kvm_set_ioeventfd_pio(int fd, uint16_t addr, uint16_t val,
1252 bool assign, uint32_t size, bool datamatch)
1253{
1254 struct kvm_ioeventfd kick = {
1255 .datamatch = datamatch ? adjust_ioeventfd_endianness(val, size) : 0,
1256 .addr = addr,
1257 .flags = KVM_IOEVENTFD_FLAG_PIO,
1258 .len = size,
1259 .fd = fd,
1260 };
1261 int r;
1262 trace_kvm_set_ioeventfd_pio(fd, addr, val, assign, size, datamatch);
1263 if (!kvm_enabled()) {
1264 return -ENOSYS;
1265 }
1266 if (datamatch) {
1267 kick.flags |= KVM_IOEVENTFD_FLAG_DATAMATCH;
1268 }
1269 if (!assign) {
1270 kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
1271 }
1272 r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
1273 if (r < 0) {
1274 return r;
1275 }
1276 return 0;
1277}
1278
1279
1280static int kvm_check_many_ioeventfds(void)
1281{
1282
1283
1284
1285
1286
1287
1288
1289#if defined(CONFIG_EVENTFD)
1290 int ioeventfds[7];
1291 int i, ret = 0;
1292 for (i = 0; i < ARRAY_SIZE(ioeventfds); i++) {
1293 ioeventfds[i] = eventfd(0, EFD_CLOEXEC);
1294 if (ioeventfds[i] < 0) {
1295 break;
1296 }
1297 ret = kvm_set_ioeventfd_pio(ioeventfds[i], 0, i, true, 2, true);
1298 if (ret < 0) {
1299 close(ioeventfds[i]);
1300 break;
1301 }
1302 }
1303
1304
1305 ret = i == ARRAY_SIZE(ioeventfds);
1306
1307 while (i-- > 0) {
1308 kvm_set_ioeventfd_pio(ioeventfds[i], 0, i, false, 2, true);
1309 close(ioeventfds[i]);
1310 }
1311 return ret;
1312#else
1313 return 0;
1314#endif
1315}
1316
1317static const KVMCapabilityInfo *
1318kvm_check_extension_list(KVMState *s, const KVMCapabilityInfo *list)
1319{
1320 while (list->name) {
1321 if (!kvm_check_extension(s, list->value)) {
1322 return list;
1323 }
1324 list++;
1325 }
1326 return NULL;
1327}
1328
1329void kvm_set_max_memslot_size(hwaddr max_slot_size)
1330{
1331 g_assert(
1332 ROUND_UP(max_slot_size, qemu_real_host_page_size) == max_slot_size
1333 );
1334 kvm_max_slot_size = max_slot_size;
1335}
1336
1337static void kvm_set_phys_mem(KVMMemoryListener *kml,
1338 MemoryRegionSection *section, bool add)
1339{
1340 KVMSlot *mem;
1341 int err;
1342 MemoryRegion *mr = section->mr;
1343 bool writeable = !mr->readonly && !mr->rom_device;
1344 hwaddr start_addr, size, slot_size, mr_offset;
1345 ram_addr_t ram_start_offset;
1346 void *ram;
1347
1348 if (!memory_region_is_ram(mr)) {
1349 if (writeable || !kvm_readonly_mem_allowed) {
1350 return;
1351 } else if (!mr->romd_mode) {
1352
1353
1354 add = false;
1355 }
1356 }
1357
1358 size = kvm_align_section(section, &start_addr);
1359 if (!size) {
1360 return;
1361 }
1362
1363
1364 mr_offset = section->offset_within_region + start_addr -
1365 section->offset_within_address_space;
1366
1367
1368 ram = memory_region_get_ram_ptr(mr) + mr_offset;
1369 ram_start_offset = memory_region_get_ram_addr(mr) + mr_offset;
1370
1371 kvm_slots_lock();
1372
1373 if (!add) {
1374 do {
1375 slot_size = MIN(kvm_max_slot_size, size);
1376 mem = kvm_lookup_matching_slot(kml, start_addr, slot_size);
1377 if (!mem) {
1378 goto out;
1379 }
1380 if (mem->flags & KVM_MEM_LOG_DIRTY_PAGES) {
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394 if (kvm_state->kvm_dirty_ring_size) {
1395 kvm_dirty_ring_reap_locked(kvm_state);
1396 } else {
1397 kvm_slot_get_dirty_log(kvm_state, mem);
1398 }
1399 kvm_slot_sync_dirty_pages(mem);
1400 }
1401
1402
1403 g_free(mem->dirty_bmap);
1404 mem->dirty_bmap = NULL;
1405 mem->memory_size = 0;
1406 mem->flags = 0;
1407 err = kvm_set_user_memory_region(kml, mem, false);
1408 if (err) {
1409 fprintf(stderr, "%s: error unregistering slot: %s\n",
1410 __func__, strerror(-err));
1411 abort();
1412 }
1413 start_addr += slot_size;
1414 size -= slot_size;
1415 } while (size);
1416 goto out;
1417 }
1418
1419
1420 do {
1421 slot_size = MIN(kvm_max_slot_size, size);
1422 mem = kvm_alloc_slot(kml);
1423 mem->as_id = kml->as_id;
1424 mem->memory_size = slot_size;
1425 mem->start_addr = start_addr;
1426 mem->ram_start_offset = ram_start_offset;
1427 mem->ram = ram;
1428 mem->flags = kvm_mem_flags(mr);
1429 kvm_slot_init_dirty_bitmap(mem);
1430 err = kvm_set_user_memory_region(kml, mem, true);
1431 if (err) {
1432 fprintf(stderr, "%s: error registering slot: %s\n", __func__,
1433 strerror(-err));
1434 abort();
1435 }
1436 start_addr += slot_size;
1437 ram_start_offset += slot_size;
1438 ram += slot_size;
1439 size -= slot_size;
1440 } while (size);
1441
1442out:
1443 kvm_slots_unlock();
1444}
1445
1446static void *kvm_dirty_ring_reaper_thread(void *data)
1447{
1448 KVMState *s = data;
1449 struct KVMDirtyRingReaper *r = &s->reaper;
1450
1451 rcu_register_thread();
1452
1453 trace_kvm_dirty_ring_reaper("init");
1454
1455 while (true) {
1456 r->reaper_state = KVM_DIRTY_RING_REAPER_WAIT;
1457 trace_kvm_dirty_ring_reaper("wait");
1458
1459
1460
1461 sleep(1);
1462
1463 trace_kvm_dirty_ring_reaper("wakeup");
1464 r->reaper_state = KVM_DIRTY_RING_REAPER_REAPING;
1465
1466 qemu_mutex_lock_iothread();
1467 kvm_dirty_ring_reap(s);
1468 qemu_mutex_unlock_iothread();
1469
1470 r->reaper_iteration++;
1471 }
1472
1473 trace_kvm_dirty_ring_reaper("exit");
1474
1475 rcu_unregister_thread();
1476
1477 return NULL;
1478}
1479
1480static int kvm_dirty_ring_reaper_init(KVMState *s)
1481{
1482 struct KVMDirtyRingReaper *r = &s->reaper;
1483
1484 qemu_thread_create(&r->reaper_thr, "kvm-reaper",
1485 kvm_dirty_ring_reaper_thread,
1486 s, QEMU_THREAD_JOINABLE);
1487
1488 return 0;
1489}
1490
1491static void kvm_region_add(MemoryListener *listener,
1492 MemoryRegionSection *section)
1493{
1494 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
1495
1496 memory_region_ref(section->mr);
1497 kvm_set_phys_mem(kml, section, true);
1498}
1499
1500static void kvm_region_del(MemoryListener *listener,
1501 MemoryRegionSection *section)
1502{
1503 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
1504
1505 kvm_set_phys_mem(kml, section, false);
1506 memory_region_unref(section->mr);
1507}
1508
1509static void kvm_log_sync(MemoryListener *listener,
1510 MemoryRegionSection *section)
1511{
1512 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
1513
1514 kvm_slots_lock();
1515 kvm_physical_sync_dirty_bitmap(kml, section);
1516 kvm_slots_unlock();
1517}
1518
1519static void kvm_log_sync_global(MemoryListener *l)
1520{
1521 KVMMemoryListener *kml = container_of(l, KVMMemoryListener, listener);
1522 KVMState *s = kvm_state;
1523 KVMSlot *mem;
1524 int i;
1525
1526
1527 kvm_dirty_ring_flush();
1528
1529
1530
1531
1532
1533 kvm_slots_lock();
1534 for (i = 0; i < s->nr_slots; i++) {
1535 mem = &kml->slots[i];
1536 if (mem->memory_size && mem->flags & KVM_MEM_LOG_DIRTY_PAGES) {
1537 kvm_slot_sync_dirty_pages(mem);
1538
1539
1540
1541
1542
1543 kvm_slot_reset_dirty_pages(mem);
1544 }
1545 }
1546 kvm_slots_unlock();
1547}
1548
1549static void kvm_log_clear(MemoryListener *listener,
1550 MemoryRegionSection *section)
1551{
1552 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
1553 int r;
1554
1555 r = kvm_physical_log_clear(kml, section);
1556 if (r < 0) {
1557 error_report_once("%s: kvm log clear failed: mr=%s "
1558 "offset=%"HWADDR_PRIx" size=%"PRIx64, __func__,
1559 section->mr->name, section->offset_within_region,
1560 int128_get64(section->size));
1561 abort();
1562 }
1563}
1564
1565static void kvm_mem_ioeventfd_add(MemoryListener *listener,
1566 MemoryRegionSection *section,
1567 bool match_data, uint64_t data,
1568 EventNotifier *e)
1569{
1570 int fd = event_notifier_get_fd(e);
1571 int r;
1572
1573 r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
1574 data, true, int128_get64(section->size),
1575 match_data);
1576 if (r < 0) {
1577 fprintf(stderr, "%s: error adding ioeventfd: %s (%d)\n",
1578 __func__, strerror(-r), -r);
1579 abort();
1580 }
1581}
1582
1583static void kvm_mem_ioeventfd_del(MemoryListener *listener,
1584 MemoryRegionSection *section,
1585 bool match_data, uint64_t data,
1586 EventNotifier *e)
1587{
1588 int fd = event_notifier_get_fd(e);
1589 int r;
1590
1591 r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
1592 data, false, int128_get64(section->size),
1593 match_data);
1594 if (r < 0) {
1595 fprintf(stderr, "%s: error deleting ioeventfd: %s (%d)\n",
1596 __func__, strerror(-r), -r);
1597 abort();
1598 }
1599}
1600
1601static void kvm_io_ioeventfd_add(MemoryListener *listener,
1602 MemoryRegionSection *section,
1603 bool match_data, uint64_t data,
1604 EventNotifier *e)
1605{
1606 int fd = event_notifier_get_fd(e);
1607 int r;
1608
1609 r = kvm_set_ioeventfd_pio(fd, section->offset_within_address_space,
1610 data, true, int128_get64(section->size),
1611 match_data);
1612 if (r < 0) {
1613 fprintf(stderr, "%s: error adding ioeventfd: %s (%d)\n",
1614 __func__, strerror(-r), -r);
1615 abort();
1616 }
1617}
1618
1619static void kvm_io_ioeventfd_del(MemoryListener *listener,
1620 MemoryRegionSection *section,
1621 bool match_data, uint64_t data,
1622 EventNotifier *e)
1623
1624{
1625 int fd = event_notifier_get_fd(e);
1626 int r;
1627
1628 r = kvm_set_ioeventfd_pio(fd, section->offset_within_address_space,
1629 data, false, int128_get64(section->size),
1630 match_data);
1631 if (r < 0) {
1632 fprintf(stderr, "%s: error deleting ioeventfd: %s (%d)\n",
1633 __func__, strerror(-r), -r);
1634 abort();
1635 }
1636}
1637
1638void kvm_memory_listener_register(KVMState *s, KVMMemoryListener *kml,
1639 AddressSpace *as, int as_id, const char *name)
1640{
1641 int i;
1642
1643 kml->slots = g_malloc0(s->nr_slots * sizeof(KVMSlot));
1644 kml->as_id = as_id;
1645
1646 for (i = 0; i < s->nr_slots; i++) {
1647 kml->slots[i].slot = i;
1648 }
1649
1650 kml->listener.region_add = kvm_region_add;
1651 kml->listener.region_del = kvm_region_del;
1652 kml->listener.log_start = kvm_log_start;
1653 kml->listener.log_stop = kvm_log_stop;
1654 kml->listener.priority = 10;
1655 kml->listener.name = name;
1656
1657 if (s->kvm_dirty_ring_size) {
1658 kml->listener.log_sync_global = kvm_log_sync_global;
1659 } else {
1660 kml->listener.log_sync = kvm_log_sync;
1661 kml->listener.log_clear = kvm_log_clear;
1662 }
1663
1664 memory_listener_register(&kml->listener, as);
1665
1666 for (i = 0; i < s->nr_as; ++i) {
1667 if (!s->as[i].as) {
1668 s->as[i].as = as;
1669 s->as[i].ml = kml;
1670 break;
1671 }
1672 }
1673}
1674
1675static MemoryListener kvm_io_listener = {
1676 .name = "kvm-io",
1677 .eventfd_add = kvm_io_ioeventfd_add,
1678 .eventfd_del = kvm_io_ioeventfd_del,
1679 .priority = 10,
1680};
1681
1682int kvm_set_irq(KVMState *s, int irq, int level)
1683{
1684 struct kvm_irq_level event;
1685 int ret;
1686
1687 assert(kvm_async_interrupts_enabled());
1688
1689 event.level = level;
1690 event.irq = irq;
1691 ret = kvm_vm_ioctl(s, s->irq_set_ioctl, &event);
1692 if (ret < 0) {
1693 perror("kvm_set_irq");
1694 abort();
1695 }
1696
1697 return (s->irq_set_ioctl == KVM_IRQ_LINE) ? 1 : event.status;
1698}
1699
1700#ifdef KVM_CAP_IRQ_ROUTING
1701typedef struct KVMMSIRoute {
1702 struct kvm_irq_routing_entry kroute;
1703 QTAILQ_ENTRY(KVMMSIRoute) entry;
1704} KVMMSIRoute;
1705
1706static void set_gsi(KVMState *s, unsigned int gsi)
1707{
1708 set_bit(gsi, s->used_gsi_bitmap);
1709}
1710
1711static void clear_gsi(KVMState *s, unsigned int gsi)
1712{
1713 clear_bit(gsi, s->used_gsi_bitmap);
1714}
1715
1716void kvm_init_irq_routing(KVMState *s)
1717{
1718 int gsi_count, i;
1719
1720 gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING) - 1;
1721 if (gsi_count > 0) {
1722
1723 s->used_gsi_bitmap = bitmap_new(gsi_count);
1724 s->gsi_count = gsi_count;
1725 }
1726
1727 s->irq_routes = g_malloc0(sizeof(*s->irq_routes));
1728 s->nr_allocated_irq_routes = 0;
1729
1730 if (!kvm_direct_msi_allowed) {
1731 for (i = 0; i < KVM_MSI_HASHTAB_SIZE; i++) {
1732 QTAILQ_INIT(&s->msi_hashtab[i]);
1733 }
1734 }
1735
1736 kvm_arch_init_irq_routing(s);
1737}
1738
1739void kvm_irqchip_commit_routes(KVMState *s)
1740{
1741 int ret;
1742
1743 if (kvm_gsi_direct_mapping()) {
1744 return;
1745 }
1746
1747 if (!kvm_gsi_routing_enabled()) {
1748 return;
1749 }
1750
1751 s->irq_routes->flags = 0;
1752 trace_kvm_irqchip_commit_routes();
1753 ret = kvm_vm_ioctl(s, KVM_SET_GSI_ROUTING, s->irq_routes);
1754 assert(ret == 0);
1755}
1756
1757static void kvm_add_routing_entry(KVMState *s,
1758 struct kvm_irq_routing_entry *entry)
1759{
1760 struct kvm_irq_routing_entry *new;
1761 int n, size;
1762
1763 if (s->irq_routes->nr == s->nr_allocated_irq_routes) {
1764 n = s->nr_allocated_irq_routes * 2;
1765 if (n < 64) {
1766 n = 64;
1767 }
1768 size = sizeof(struct kvm_irq_routing);
1769 size += n * sizeof(*new);
1770 s->irq_routes = g_realloc(s->irq_routes, size);
1771 s->nr_allocated_irq_routes = n;
1772 }
1773 n = s->irq_routes->nr++;
1774 new = &s->irq_routes->entries[n];
1775
1776 *new = *entry;
1777
1778 set_gsi(s, entry->gsi);
1779}
1780
1781static int kvm_update_routing_entry(KVMState *s,
1782 struct kvm_irq_routing_entry *new_entry)
1783{
1784 struct kvm_irq_routing_entry *entry;
1785 int n;
1786
1787 for (n = 0; n < s->irq_routes->nr; n++) {
1788 entry = &s->irq_routes->entries[n];
1789 if (entry->gsi != new_entry->gsi) {
1790 continue;
1791 }
1792
1793 if(!memcmp(entry, new_entry, sizeof *entry)) {
1794 return 0;
1795 }
1796
1797 *entry = *new_entry;
1798
1799 return 0;
1800 }
1801
1802 return -ESRCH;
1803}
1804
1805void kvm_irqchip_add_irq_route(KVMState *s, int irq, int irqchip, int pin)
1806{
1807 struct kvm_irq_routing_entry e = {};
1808
1809 assert(pin < s->gsi_count);
1810
1811 e.gsi = irq;
1812 e.type = KVM_IRQ_ROUTING_IRQCHIP;
1813 e.flags = 0;
1814 e.u.irqchip.irqchip = irqchip;
1815 e.u.irqchip.pin = pin;
1816 kvm_add_routing_entry(s, &e);
1817}
1818
1819void kvm_irqchip_release_virq(KVMState *s, int virq)
1820{
1821 struct kvm_irq_routing_entry *e;
1822 int i;
1823
1824 if (kvm_gsi_direct_mapping()) {
1825 return;
1826 }
1827
1828 for (i = 0; i < s->irq_routes->nr; i++) {
1829 e = &s->irq_routes->entries[i];
1830 if (e->gsi == virq) {
1831 s->irq_routes->nr--;
1832 *e = s->irq_routes->entries[s->irq_routes->nr];
1833 }
1834 }
1835 clear_gsi(s, virq);
1836 kvm_arch_release_virq_post(virq);
1837 trace_kvm_irqchip_release_virq(virq);
1838}
1839
1840void kvm_irqchip_add_change_notifier(Notifier *n)
1841{
1842 notifier_list_add(&kvm_irqchip_change_notifiers, n);
1843}
1844
1845void kvm_irqchip_remove_change_notifier(Notifier *n)
1846{
1847 notifier_remove(n);
1848}
1849
1850void kvm_irqchip_change_notify(void)
1851{
1852 notifier_list_notify(&kvm_irqchip_change_notifiers, NULL);
1853}
1854
1855static unsigned int kvm_hash_msi(uint32_t data)
1856{
1857
1858
1859 return data & 0xff;
1860}
1861
1862static void kvm_flush_dynamic_msi_routes(KVMState *s)
1863{
1864 KVMMSIRoute *route, *next;
1865 unsigned int hash;
1866
1867 for (hash = 0; hash < KVM_MSI_HASHTAB_SIZE; hash++) {
1868 QTAILQ_FOREACH_SAFE(route, &s->msi_hashtab[hash], entry, next) {
1869 kvm_irqchip_release_virq(s, route->kroute.gsi);
1870 QTAILQ_REMOVE(&s->msi_hashtab[hash], route, entry);
1871 g_free(route);
1872 }
1873 }
1874}
1875
1876static int kvm_irqchip_get_virq(KVMState *s)
1877{
1878 int next_virq;
1879
1880
1881
1882
1883
1884
1885
1886 if (!kvm_direct_msi_allowed && s->irq_routes->nr == s->gsi_count) {
1887 kvm_flush_dynamic_msi_routes(s);
1888 }
1889
1890
1891 next_virq = find_first_zero_bit(s->used_gsi_bitmap, s->gsi_count);
1892 if (next_virq >= s->gsi_count) {
1893 return -ENOSPC;
1894 } else {
1895 return next_virq;
1896 }
1897}
1898
1899static KVMMSIRoute *kvm_lookup_msi_route(KVMState *s, MSIMessage msg)
1900{
1901 unsigned int hash = kvm_hash_msi(msg.data);
1902 KVMMSIRoute *route;
1903
1904 QTAILQ_FOREACH(route, &s->msi_hashtab[hash], entry) {
1905 if (route->kroute.u.msi.address_lo == (uint32_t)msg.address &&
1906 route->kroute.u.msi.address_hi == (msg.address >> 32) &&
1907 route->kroute.u.msi.data == le32_to_cpu(msg.data)) {
1908 return route;
1909 }
1910 }
1911 return NULL;
1912}
1913
1914int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
1915{
1916 struct kvm_msi msi;
1917 KVMMSIRoute *route;
1918
1919 if (kvm_direct_msi_allowed) {
1920 msi.address_lo = (uint32_t)msg.address;
1921 msi.address_hi = msg.address >> 32;
1922 msi.data = le32_to_cpu(msg.data);
1923 msi.flags = 0;
1924 memset(msi.pad, 0, sizeof(msi.pad));
1925
1926 return kvm_vm_ioctl(s, KVM_SIGNAL_MSI, &msi);
1927 }
1928
1929 route = kvm_lookup_msi_route(s, msg);
1930 if (!route) {
1931 int virq;
1932
1933 virq = kvm_irqchip_get_virq(s);
1934 if (virq < 0) {
1935 return virq;
1936 }
1937
1938 route = g_malloc0(sizeof(KVMMSIRoute));
1939 route->kroute.gsi = virq;
1940 route->kroute.type = KVM_IRQ_ROUTING_MSI;
1941 route->kroute.flags = 0;
1942 route->kroute.u.msi.address_lo = (uint32_t)msg.address;
1943 route->kroute.u.msi.address_hi = msg.address >> 32;
1944 route->kroute.u.msi.data = le32_to_cpu(msg.data);
1945
1946 kvm_add_routing_entry(s, &route->kroute);
1947 kvm_irqchip_commit_routes(s);
1948
1949 QTAILQ_INSERT_TAIL(&s->msi_hashtab[kvm_hash_msi(msg.data)], route,
1950 entry);
1951 }
1952
1953 assert(route->kroute.type == KVM_IRQ_ROUTING_MSI);
1954
1955 return kvm_set_irq(s, route->kroute.gsi, 1);
1956}
1957
1958int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
1959{
1960 struct kvm_irq_routing_entry kroute = {};
1961 int virq;
1962 MSIMessage msg = {0, 0};
1963
1964 if (pci_available && dev) {
1965 msg = pci_get_msi_message(dev, vector);
1966 }
1967
1968 if (kvm_gsi_direct_mapping()) {
1969 return kvm_arch_msi_data_to_gsi(msg.data);
1970 }
1971
1972 if (!kvm_gsi_routing_enabled()) {
1973 return -ENOSYS;
1974 }
1975
1976 virq = kvm_irqchip_get_virq(s);
1977 if (virq < 0) {
1978 return virq;
1979 }
1980
1981 kroute.gsi = virq;
1982 kroute.type = KVM_IRQ_ROUTING_MSI;
1983 kroute.flags = 0;
1984 kroute.u.msi.address_lo = (uint32_t)msg.address;
1985 kroute.u.msi.address_hi = msg.address >> 32;
1986 kroute.u.msi.data = le32_to_cpu(msg.data);
1987 if (pci_available && kvm_msi_devid_required()) {
1988 kroute.flags = KVM_MSI_VALID_DEVID;
1989 kroute.u.msi.devid = pci_requester_id(dev);
1990 }
1991 if (kvm_arch_fixup_msi_route(&kroute, msg.address, msg.data, dev)) {
1992 kvm_irqchip_release_virq(s, virq);
1993 return -EINVAL;
1994 }
1995
1996 trace_kvm_irqchip_add_msi_route(dev ? dev->name : (char *)"N/A",
1997 vector, virq);
1998
1999 kvm_add_routing_entry(s, &kroute);
2000 kvm_arch_add_msi_route_post(&kroute, vector, dev);
2001 kvm_irqchip_commit_routes(s);
2002
2003 return virq;
2004}
2005
2006int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg,
2007 PCIDevice *dev)
2008{
2009 struct kvm_irq_routing_entry kroute = {};
2010
2011 if (kvm_gsi_direct_mapping()) {
2012 return 0;
2013 }
2014
2015 if (!kvm_irqchip_in_kernel()) {
2016 return -ENOSYS;
2017 }
2018
2019 kroute.gsi = virq;
2020 kroute.type = KVM_IRQ_ROUTING_MSI;
2021 kroute.flags = 0;
2022 kroute.u.msi.address_lo = (uint32_t)msg.address;
2023 kroute.u.msi.address_hi = msg.address >> 32;
2024 kroute.u.msi.data = le32_to_cpu(msg.data);
2025 if (pci_available && kvm_msi_devid_required()) {
2026 kroute.flags = KVM_MSI_VALID_DEVID;
2027 kroute.u.msi.devid = pci_requester_id(dev);
2028 }
2029 if (kvm_arch_fixup_msi_route(&kroute, msg.address, msg.data, dev)) {
2030 return -EINVAL;
2031 }
2032
2033 trace_kvm_irqchip_update_msi_route(virq);
2034
2035 return kvm_update_routing_entry(s, &kroute);
2036}
2037
2038static int kvm_irqchip_assign_irqfd(KVMState *s, EventNotifier *event,
2039 EventNotifier *resample, int virq,
2040 bool assign)
2041{
2042 int fd = event_notifier_get_fd(event);
2043 int rfd = resample ? event_notifier_get_fd(resample) : -1;
2044
2045 struct kvm_irqfd irqfd = {
2046 .fd = fd,
2047 .gsi = virq,
2048 .flags = assign ? 0 : KVM_IRQFD_FLAG_DEASSIGN,
2049 };
2050
2051 if (rfd != -1) {
2052 assert(assign);
2053 if (kvm_irqchip_is_split()) {
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070 kvm_resample_fd_insert(virq, resample);
2071 } else {
2072 irqfd.flags |= KVM_IRQFD_FLAG_RESAMPLE;
2073 irqfd.resamplefd = rfd;
2074 }
2075 } else if (!assign) {
2076 if (kvm_irqchip_is_split()) {
2077 kvm_resample_fd_remove(virq);
2078 }
2079 }
2080
2081 if (!kvm_irqfds_enabled()) {
2082 return -ENOSYS;
2083 }
2084
2085 return kvm_vm_ioctl(s, KVM_IRQFD, &irqfd);
2086}
2087
2088int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter)
2089{
2090 struct kvm_irq_routing_entry kroute = {};
2091 int virq;
2092
2093 if (!kvm_gsi_routing_enabled()) {
2094 return -ENOSYS;
2095 }
2096
2097 virq = kvm_irqchip_get_virq(s);
2098 if (virq < 0) {
2099 return virq;
2100 }
2101
2102 kroute.gsi = virq;
2103 kroute.type = KVM_IRQ_ROUTING_S390_ADAPTER;
2104 kroute.flags = 0;
2105 kroute.u.adapter.summary_addr = adapter->summary_addr;
2106 kroute.u.adapter.ind_addr = adapter->ind_addr;
2107 kroute.u.adapter.summary_offset = adapter->summary_offset;
2108 kroute.u.adapter.ind_offset = adapter->ind_offset;
2109 kroute.u.adapter.adapter_id = adapter->adapter_id;
2110
2111 kvm_add_routing_entry(s, &kroute);
2112
2113 return virq;
2114}
2115
2116int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint)
2117{
2118 struct kvm_irq_routing_entry kroute = {};
2119 int virq;
2120
2121 if (!kvm_gsi_routing_enabled()) {
2122 return -ENOSYS;
2123 }
2124 if (!kvm_check_extension(s, KVM_CAP_HYPERV_SYNIC)) {
2125 return -ENOSYS;
2126 }
2127 virq = kvm_irqchip_get_virq(s);
2128 if (virq < 0) {
2129 return virq;
2130 }
2131
2132 kroute.gsi = virq;
2133 kroute.type = KVM_IRQ_ROUTING_HV_SINT;
2134 kroute.flags = 0;
2135 kroute.u.hv_sint.vcpu = vcpu;
2136 kroute.u.hv_sint.sint = sint;
2137
2138 kvm_add_routing_entry(s, &kroute);
2139 kvm_irqchip_commit_routes(s);
2140
2141 return virq;
2142}
2143
2144#else
2145
2146void kvm_init_irq_routing(KVMState *s)
2147{
2148}
2149
2150void kvm_irqchip_release_virq(KVMState *s, int virq)
2151{
2152}
2153
2154int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
2155{
2156 abort();
2157}
2158
2159int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
2160{
2161 return -ENOSYS;
2162}
2163
2164int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter)
2165{
2166 return -ENOSYS;
2167}
2168
2169int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint)
2170{
2171 return -ENOSYS;
2172}
2173
2174static int kvm_irqchip_assign_irqfd(KVMState *s, EventNotifier *event,
2175 EventNotifier *resample, int virq,
2176 bool assign)
2177{
2178 abort();
2179}
2180
2181int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg)
2182{
2183 return -ENOSYS;
2184}
2185#endif
2186
2187int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
2188 EventNotifier *rn, int virq)
2189{
2190 return kvm_irqchip_assign_irqfd(s, n, rn, virq, true);
2191}
2192
2193int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
2194 int virq)
2195{
2196 return kvm_irqchip_assign_irqfd(s, n, NULL, virq, false);
2197}
2198
2199int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n,
2200 EventNotifier *rn, qemu_irq irq)
2201{
2202 gpointer key, gsi;
2203 gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
2204
2205 if (!found) {
2206 return -ENXIO;
2207 }
2208 return kvm_irqchip_add_irqfd_notifier_gsi(s, n, rn, GPOINTER_TO_INT(gsi));
2209}
2210
2211int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n,
2212 qemu_irq irq)
2213{
2214 gpointer key, gsi;
2215 gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
2216
2217 if (!found) {
2218 return -ENXIO;
2219 }
2220 return kvm_irqchip_remove_irqfd_notifier_gsi(s, n, GPOINTER_TO_INT(gsi));
2221}
2222
2223void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi)
2224{
2225 g_hash_table_insert(s->gsimap, irq, GINT_TO_POINTER(gsi));
2226}
2227
2228static void kvm_irqchip_create(KVMState *s)
2229{
2230 int ret;
2231
2232 assert(s->kernel_irqchip_split != ON_OFF_AUTO_AUTO);
2233 if (kvm_check_extension(s, KVM_CAP_IRQCHIP)) {
2234 ;
2235 } else if (kvm_check_extension(s, KVM_CAP_S390_IRQCHIP)) {
2236 ret = kvm_vm_enable_cap(s, KVM_CAP_S390_IRQCHIP, 0);
2237 if (ret < 0) {
2238 fprintf(stderr, "Enable kernel irqchip failed: %s\n", strerror(-ret));
2239 exit(1);
2240 }
2241 } else {
2242 return;
2243 }
2244
2245
2246
2247 ret = kvm_arch_irqchip_create(s);
2248 if (ret == 0) {
2249 if (s->kernel_irqchip_split == ON_OFF_AUTO_ON) {
2250 perror("Split IRQ chip mode not supported.");
2251 exit(1);
2252 } else {
2253 ret = kvm_vm_ioctl(s, KVM_CREATE_IRQCHIP);
2254 }
2255 }
2256 if (ret < 0) {
2257 fprintf(stderr, "Create kernel irqchip failed: %s\n", strerror(-ret));
2258 exit(1);
2259 }
2260
2261 kvm_kernel_irqchip = true;
2262
2263
2264
2265 kvm_async_interrupts_allowed = true;
2266 kvm_halt_in_kernel_allowed = true;
2267
2268 kvm_init_irq_routing(s);
2269
2270 s->gsimap = g_hash_table_new(g_direct_hash, g_direct_equal);
2271}
2272
2273
2274
2275
2276
2277static int kvm_recommended_vcpus(KVMState *s)
2278{
2279 int ret = kvm_vm_check_extension(s, KVM_CAP_NR_VCPUS);
2280 return (ret) ? ret : 4;
2281}
2282
2283static int kvm_max_vcpus(KVMState *s)
2284{
2285 int ret = kvm_check_extension(s, KVM_CAP_MAX_VCPUS);
2286 return (ret) ? ret : kvm_recommended_vcpus(s);
2287}
2288
2289static int kvm_max_vcpu_id(KVMState *s)
2290{
2291 int ret = kvm_check_extension(s, KVM_CAP_MAX_VCPU_ID);
2292 return (ret) ? ret : kvm_max_vcpus(s);
2293}
2294
2295bool kvm_vcpu_id_is_valid(int vcpu_id)
2296{
2297 KVMState *s = KVM_STATE(current_accel());
2298 return vcpu_id >= 0 && vcpu_id < kvm_max_vcpu_id(s);
2299}
2300
2301bool kvm_dirty_ring_enabled(void)
2302{
2303 return kvm_state->kvm_dirty_ring_size ? true : false;
2304}
2305
2306static int kvm_init(MachineState *ms)
2307{
2308 MachineClass *mc = MACHINE_GET_CLASS(ms);
2309 static const char upgrade_note[] =
2310 "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
2311 "(see http://sourceforge.net/projects/kvm).\n";
2312 struct {
2313 const char *name;
2314 int num;
2315 } num_cpus[] = {
2316 { "SMP", ms->smp.cpus },
2317 { "hotpluggable", ms->smp.max_cpus },
2318 { NULL, }
2319 }, *nc = num_cpus;
2320 int soft_vcpus_limit, hard_vcpus_limit;
2321 KVMState *s;
2322 const KVMCapabilityInfo *missing_cap;
2323 int ret;
2324 int type = 0;
2325 uint64_t dirty_log_manual_caps;
2326
2327 qemu_mutex_init(&kml_slots_lock);
2328
2329 s = KVM_STATE(ms->accelerator);
2330
2331
2332
2333
2334
2335
2336
2337 assert(TARGET_PAGE_SIZE <= qemu_real_host_page_size);
2338
2339 s->sigmask_len = 8;
2340
2341#ifdef KVM_CAP_SET_GUEST_DEBUG
2342 QTAILQ_INIT(&s->kvm_sw_breakpoints);
2343#endif
2344 QLIST_INIT(&s->kvm_parked_vcpus);
2345 s->fd = qemu_open_old("/dev/kvm", O_RDWR);
2346 if (s->fd == -1) {
2347 fprintf(stderr, "Could not access KVM kernel module: %m\n");
2348 ret = -errno;
2349 goto err;
2350 }
2351
2352 ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
2353 if (ret < KVM_API_VERSION) {
2354 if (ret >= 0) {
2355 ret = -EINVAL;
2356 }
2357 fprintf(stderr, "kvm version too old\n");
2358 goto err;
2359 }
2360
2361 if (ret > KVM_API_VERSION) {
2362 ret = -EINVAL;
2363 fprintf(stderr, "kvm version not supported\n");
2364 goto err;
2365 }
2366
2367 kvm_immediate_exit = kvm_check_extension(s, KVM_CAP_IMMEDIATE_EXIT);
2368 s->nr_slots = kvm_check_extension(s, KVM_CAP_NR_MEMSLOTS);
2369
2370
2371 if (!s->nr_slots) {
2372 s->nr_slots = 32;
2373 }
2374
2375 s->nr_as = kvm_check_extension(s, KVM_CAP_MULTI_ADDRESS_SPACE);
2376 if (s->nr_as <= 1) {
2377 s->nr_as = 1;
2378 }
2379 s->as = g_new0(struct KVMAs, s->nr_as);
2380
2381 if (object_property_find(OBJECT(current_machine), "kvm-type")) {
2382 g_autofree char *kvm_type = object_property_get_str(OBJECT(current_machine),
2383 "kvm-type",
2384 &error_abort);
2385 type = mc->kvm_type(ms, kvm_type);
2386 } else if (mc->kvm_type) {
2387 type = mc->kvm_type(ms, NULL);
2388 }
2389
2390 do {
2391 ret = kvm_ioctl(s, KVM_CREATE_VM, type);
2392 } while (ret == -EINTR);
2393
2394 if (ret < 0) {
2395 fprintf(stderr, "ioctl(KVM_CREATE_VM) failed: %d %s\n", -ret,
2396 strerror(-ret));
2397
2398#ifdef TARGET_S390X
2399 if (ret == -EINVAL) {
2400 fprintf(stderr,
2401 "Host kernel setup problem detected. Please verify:\n");
2402 fprintf(stderr, "- for kernels supporting the switch_amode or"
2403 " user_mode parameters, whether\n");
2404 fprintf(stderr,
2405 " user space is running in primary address space\n");
2406 fprintf(stderr,
2407 "- for kernels supporting the vm.allocate_pgste sysctl, "
2408 "whether it is enabled\n");
2409 }
2410#elif defined(TARGET_PPC)
2411 if (ret == -EINVAL) {
2412 fprintf(stderr,
2413 "PPC KVM module is not loaded. Try modprobe kvm_%s.\n",
2414 (type == 2) ? "pr" : "hv");
2415 }
2416#endif
2417 goto err;
2418 }
2419
2420 s->vmfd = ret;
2421
2422
2423 soft_vcpus_limit = kvm_recommended_vcpus(s);
2424 hard_vcpus_limit = kvm_max_vcpus(s);
2425
2426 while (nc->name) {
2427 if (nc->num > soft_vcpus_limit) {
2428 warn_report("Number of %s cpus requested (%d) exceeds "
2429 "the recommended cpus supported by KVM (%d)",
2430 nc->name, nc->num, soft_vcpus_limit);
2431
2432 if (nc->num > hard_vcpus_limit) {
2433 fprintf(stderr, "Number of %s cpus requested (%d) exceeds "
2434 "the maximum cpus supported by KVM (%d)\n",
2435 nc->name, nc->num, hard_vcpus_limit);
2436 exit(1);
2437 }
2438 }
2439 nc++;
2440 }
2441
2442 missing_cap = kvm_check_extension_list(s, kvm_required_capabilites);
2443 if (!missing_cap) {
2444 missing_cap =
2445 kvm_check_extension_list(s, kvm_arch_required_capabilities);
2446 }
2447 if (missing_cap) {
2448 ret = -EINVAL;
2449 fprintf(stderr, "kvm does not support %s\n%s",
2450 missing_cap->name, upgrade_note);
2451 goto err;
2452 }
2453
2454 s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);
2455 s->coalesced_pio = s->coalesced_mmio &&
2456 kvm_check_extension(s, KVM_CAP_COALESCED_PIO);
2457
2458
2459
2460
2461
2462 if (s->kvm_dirty_ring_size > 0) {
2463 uint64_t ring_bytes;
2464
2465 ring_bytes = s->kvm_dirty_ring_size * sizeof(struct kvm_dirty_gfn);
2466
2467
2468 ret = kvm_vm_check_extension(s, KVM_CAP_DIRTY_LOG_RING);
2469 if (ret > 0) {
2470 if (ring_bytes > ret) {
2471 error_report("KVM dirty ring size %" PRIu32 " too big "
2472 "(maximum is %ld). Please use a smaller value.",
2473 s->kvm_dirty_ring_size,
2474 (long)ret / sizeof(struct kvm_dirty_gfn));
2475 ret = -EINVAL;
2476 goto err;
2477 }
2478
2479 ret = kvm_vm_enable_cap(s, KVM_CAP_DIRTY_LOG_RING, 0, ring_bytes);
2480 if (ret) {
2481 error_report("Enabling of KVM dirty ring failed: %s. "
2482 "Suggested minimum value is 1024.", strerror(-ret));
2483 goto err;
2484 }
2485
2486 s->kvm_dirty_ring_bytes = ring_bytes;
2487 } else {
2488 warn_report("KVM dirty ring not available, using bitmap method");
2489 s->kvm_dirty_ring_size = 0;
2490 }
2491 }
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506 if (!s->kvm_dirty_ring_size) {
2507 dirty_log_manual_caps =
2508 kvm_check_extension(s, KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2);
2509 dirty_log_manual_caps &= (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE |
2510 KVM_DIRTY_LOG_INITIALLY_SET);
2511 s->manual_dirty_log_protect = dirty_log_manual_caps;
2512 if (dirty_log_manual_caps) {
2513 ret = kvm_vm_enable_cap(s, KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2, 0,
2514 dirty_log_manual_caps);
2515 if (ret) {
2516 warn_report("Trying to enable capability %"PRIu64" of "
2517 "KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 but failed. "
2518 "Falling back to the legacy mode. ",
2519 dirty_log_manual_caps);
2520 s->manual_dirty_log_protect = 0;
2521 }
2522 }
2523 }
2524
2525#ifdef KVM_CAP_VCPU_EVENTS
2526 s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS);
2527#endif
2528
2529 s->robust_singlestep =
2530 kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP);
2531
2532#ifdef KVM_CAP_DEBUGREGS
2533 s->debugregs = kvm_check_extension(s, KVM_CAP_DEBUGREGS);
2534#endif
2535
2536 s->max_nested_state_len = kvm_check_extension(s, KVM_CAP_NESTED_STATE);
2537
2538#ifdef KVM_CAP_IRQ_ROUTING
2539 kvm_direct_msi_allowed = (kvm_check_extension(s, KVM_CAP_SIGNAL_MSI) > 0);
2540#endif
2541
2542 s->intx_set_mask = kvm_check_extension(s, KVM_CAP_PCI_2_3);
2543
2544 s->irq_set_ioctl = KVM_IRQ_LINE;
2545 if (kvm_check_extension(s, KVM_CAP_IRQ_INJECT_STATUS)) {
2546 s->irq_set_ioctl = KVM_IRQ_LINE_STATUS;
2547 }
2548
2549 kvm_readonly_mem_allowed =
2550 (kvm_check_extension(s, KVM_CAP_READONLY_MEM) > 0);
2551
2552 kvm_eventfds_allowed =
2553 (kvm_check_extension(s, KVM_CAP_IOEVENTFD) > 0);
2554
2555 kvm_irqfds_allowed =
2556 (kvm_check_extension(s, KVM_CAP_IRQFD) > 0);
2557
2558 kvm_resamplefds_allowed =
2559 (kvm_check_extension(s, KVM_CAP_IRQFD_RESAMPLE) > 0);
2560
2561 kvm_vm_attributes_allowed =
2562 (kvm_check_extension(s, KVM_CAP_VM_ATTRIBUTES) > 0);
2563
2564 kvm_ioeventfd_any_length_allowed =
2565 (kvm_check_extension(s, KVM_CAP_IOEVENTFD_ANY_LENGTH) > 0);
2566
2567 kvm_state = s;
2568
2569 ret = kvm_arch_init(ms, s);
2570 if (ret < 0) {
2571 goto err;
2572 }
2573
2574 if (s->kernel_irqchip_split == ON_OFF_AUTO_AUTO) {
2575 s->kernel_irqchip_split = mc->default_kernel_irqchip_split ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
2576 }
2577
2578 qemu_register_reset(kvm_unpoison_all, NULL);
2579
2580 if (s->kernel_irqchip_allowed) {
2581 kvm_irqchip_create(s);
2582 }
2583
2584 if (kvm_eventfds_allowed) {
2585 s->memory_listener.listener.eventfd_add = kvm_mem_ioeventfd_add;
2586 s->memory_listener.listener.eventfd_del = kvm_mem_ioeventfd_del;
2587 }
2588 s->memory_listener.listener.coalesced_io_add = kvm_coalesce_mmio_region;
2589 s->memory_listener.listener.coalesced_io_del = kvm_uncoalesce_mmio_region;
2590
2591 kvm_memory_listener_register(s, &s->memory_listener,
2592 &address_space_memory, 0, "kvm-memory");
2593 if (kvm_eventfds_allowed) {
2594 memory_listener_register(&kvm_io_listener,
2595 &address_space_io);
2596 }
2597 memory_listener_register(&kvm_coalesced_pio_listener,
2598 &address_space_io);
2599
2600 s->many_ioeventfds = kvm_check_many_ioeventfds();
2601
2602 s->sync_mmu = !!kvm_vm_check_extension(kvm_state, KVM_CAP_SYNC_MMU);
2603 if (!s->sync_mmu) {
2604 ret = ram_block_discard_disable(true);
2605 assert(!ret);
2606 }
2607
2608 if (s->kvm_dirty_ring_size) {
2609 ret = kvm_dirty_ring_reaper_init(s);
2610 if (ret) {
2611 goto err;
2612 }
2613 }
2614
2615 return 0;
2616
2617err:
2618 assert(ret < 0);
2619 if (s->vmfd >= 0) {
2620 close(s->vmfd);
2621 }
2622 if (s->fd != -1) {
2623 close(s->fd);
2624 }
2625 g_free(s->memory_listener.slots);
2626
2627 return ret;
2628}
2629
2630void kvm_set_sigmask_len(KVMState *s, unsigned int sigmask_len)
2631{
2632 s->sigmask_len = sigmask_len;
2633}
2634
2635static void kvm_handle_io(uint16_t port, MemTxAttrs attrs, void *data, int direction,
2636 int size, uint32_t count)
2637{
2638 int i;
2639 uint8_t *ptr = data;
2640
2641 for (i = 0; i < count; i++) {
2642 address_space_rw(&address_space_io, port, attrs,
2643 ptr, size,
2644 direction == KVM_EXIT_IO_OUT);
2645 ptr += size;
2646 }
2647}
2648
2649static int kvm_handle_internal_error(CPUState *cpu, struct kvm_run *run)
2650{
2651 fprintf(stderr, "KVM internal error. Suberror: %d\n",
2652 run->internal.suberror);
2653
2654 if (kvm_check_extension(kvm_state, KVM_CAP_INTERNAL_ERROR_DATA)) {
2655 int i;
2656
2657 for (i = 0; i < run->internal.ndata; ++i) {
2658 fprintf(stderr, "extra data[%d]: 0x%016"PRIx64"\n",
2659 i, (uint64_t)run->internal.data[i]);
2660 }
2661 }
2662 if (run->internal.suberror == KVM_INTERNAL_ERROR_EMULATION) {
2663 fprintf(stderr, "emulation failure\n");
2664 if (!kvm_arch_stop_on_emulation_error(cpu)) {
2665 cpu_dump_state(cpu, stderr, CPU_DUMP_CODE);
2666 return EXCP_INTERRUPT;
2667 }
2668 }
2669
2670
2671
2672 return -1;
2673}
2674
2675void kvm_flush_coalesced_mmio_buffer(void)
2676{
2677 KVMState *s = kvm_state;
2678
2679 if (s->coalesced_flush_in_progress) {
2680 return;
2681 }
2682
2683 s->coalesced_flush_in_progress = true;
2684
2685 if (s->coalesced_mmio_ring) {
2686 struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;
2687 while (ring->first != ring->last) {
2688 struct kvm_coalesced_mmio *ent;
2689
2690 ent = &ring->coalesced_mmio[ring->first];
2691
2692 if (ent->pio == 1) {
2693 address_space_write(&address_space_io, ent->phys_addr,
2694 MEMTXATTRS_UNSPECIFIED, ent->data,
2695 ent->len);
2696 } else {
2697 cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
2698 }
2699 smp_wmb();
2700 ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
2701 }
2702 }
2703
2704 s->coalesced_flush_in_progress = false;
2705}
2706
2707bool kvm_cpu_check_are_resettable(void)
2708{
2709 return kvm_arch_cpu_check_are_resettable();
2710}
2711
2712static void do_kvm_cpu_synchronize_state(CPUState *cpu, run_on_cpu_data arg)
2713{
2714 if (!cpu->vcpu_dirty) {
2715 kvm_arch_get_registers(cpu);
2716 cpu->vcpu_dirty = true;
2717 }
2718}
2719
2720void kvm_cpu_synchronize_state(CPUState *cpu)
2721{
2722 if (!cpu->vcpu_dirty) {
2723 run_on_cpu(cpu, do_kvm_cpu_synchronize_state, RUN_ON_CPU_NULL);
2724 }
2725}
2726
2727static void do_kvm_cpu_synchronize_post_reset(CPUState *cpu, run_on_cpu_data arg)
2728{
2729 kvm_arch_put_registers(cpu, KVM_PUT_RESET_STATE);
2730 cpu->vcpu_dirty = false;
2731}
2732
2733void kvm_cpu_synchronize_post_reset(CPUState *cpu)
2734{
2735 run_on_cpu(cpu, do_kvm_cpu_synchronize_post_reset, RUN_ON_CPU_NULL);
2736}
2737
2738static void do_kvm_cpu_synchronize_post_init(CPUState *cpu, run_on_cpu_data arg)
2739{
2740 kvm_arch_put_registers(cpu, KVM_PUT_FULL_STATE);
2741 cpu->vcpu_dirty = false;
2742}
2743
2744void kvm_cpu_synchronize_post_init(CPUState *cpu)
2745{
2746 run_on_cpu(cpu, do_kvm_cpu_synchronize_post_init, RUN_ON_CPU_NULL);
2747}
2748
2749static void do_kvm_cpu_synchronize_pre_loadvm(CPUState *cpu, run_on_cpu_data arg)
2750{
2751 cpu->vcpu_dirty = true;
2752}
2753
2754void kvm_cpu_synchronize_pre_loadvm(CPUState *cpu)
2755{
2756 run_on_cpu(cpu, do_kvm_cpu_synchronize_pre_loadvm, RUN_ON_CPU_NULL);
2757}
2758
2759#ifdef KVM_HAVE_MCE_INJECTION
2760static __thread void *pending_sigbus_addr;
2761static __thread int pending_sigbus_code;
2762static __thread bool have_sigbus_pending;
2763#endif
2764
2765static void kvm_cpu_kick(CPUState *cpu)
2766{
2767 qatomic_set(&cpu->kvm_run->immediate_exit, 1);
2768}
2769
2770static void kvm_cpu_kick_self(void)
2771{
2772 if (kvm_immediate_exit) {
2773 kvm_cpu_kick(current_cpu);
2774 } else {
2775 qemu_cpu_kick_self();
2776 }
2777}
2778
2779static void kvm_eat_signals(CPUState *cpu)
2780{
2781 struct timespec ts = { 0, 0 };
2782 siginfo_t siginfo;
2783 sigset_t waitset;
2784 sigset_t chkset;
2785 int r;
2786
2787 if (kvm_immediate_exit) {
2788 qatomic_set(&cpu->kvm_run->immediate_exit, 0);
2789
2790
2791
2792 smp_wmb();
2793 return;
2794 }
2795
2796 sigemptyset(&waitset);
2797 sigaddset(&waitset, SIG_IPI);
2798
2799 do {
2800 r = sigtimedwait(&waitset, &siginfo, &ts);
2801 if (r == -1 && !(errno == EAGAIN || errno == EINTR)) {
2802 perror("sigtimedwait");
2803 exit(1);
2804 }
2805
2806 r = sigpending(&chkset);
2807 if (r == -1) {
2808 perror("sigpending");
2809 exit(1);
2810 }
2811 } while (sigismember(&chkset, SIG_IPI));
2812}
2813
2814int kvm_cpu_exec(CPUState *cpu)
2815{
2816 struct kvm_run *run = cpu->kvm_run;
2817 int ret, run_ret;
2818
2819 DPRINTF("kvm_cpu_exec()\n");
2820
2821 if (kvm_arch_process_async_events(cpu)) {
2822 qatomic_set(&cpu->exit_request, 0);
2823 return EXCP_HLT;
2824 }
2825
2826 qemu_mutex_unlock_iothread();
2827 cpu_exec_start(cpu);
2828
2829 do {
2830 MemTxAttrs attrs;
2831
2832 if (cpu->vcpu_dirty) {
2833 kvm_arch_put_registers(cpu, KVM_PUT_RUNTIME_STATE);
2834 cpu->vcpu_dirty = false;
2835 }
2836
2837 kvm_arch_pre_run(cpu, run);
2838 if (qatomic_read(&cpu->exit_request)) {
2839 DPRINTF("interrupt exit requested\n");
2840
2841
2842
2843
2844
2845 kvm_cpu_kick_self();
2846 }
2847
2848
2849
2850
2851 smp_rmb();
2852
2853 run_ret = kvm_vcpu_ioctl(cpu, KVM_RUN, 0);
2854
2855 attrs = kvm_arch_post_run(cpu, run);
2856
2857#ifdef KVM_HAVE_MCE_INJECTION
2858 if (unlikely(have_sigbus_pending)) {
2859 qemu_mutex_lock_iothread();
2860 kvm_arch_on_sigbus_vcpu(cpu, pending_sigbus_code,
2861 pending_sigbus_addr);
2862 have_sigbus_pending = false;
2863 qemu_mutex_unlock_iothread();
2864 }
2865#endif
2866
2867 if (run_ret < 0) {
2868 if (run_ret == -EINTR || run_ret == -EAGAIN) {
2869 DPRINTF("io window exit\n");
2870 kvm_eat_signals(cpu);
2871 ret = EXCP_INTERRUPT;
2872 break;
2873 }
2874 fprintf(stderr, "error: kvm run failed %s\n",
2875 strerror(-run_ret));
2876#ifdef TARGET_PPC
2877 if (run_ret == -EBUSY) {
2878 fprintf(stderr,
2879 "This is probably because your SMT is enabled.\n"
2880 "VCPU can only run on primary threads with all "
2881 "secondary threads offline.\n");
2882 }
2883#endif
2884 ret = -1;
2885 break;
2886 }
2887
2888 trace_kvm_run_exit(cpu->cpu_index, run->exit_reason);
2889 switch (run->exit_reason) {
2890 case KVM_EXIT_IO:
2891 DPRINTF("handle_io\n");
2892
2893 kvm_handle_io(run->io.port, attrs,
2894 (uint8_t *)run + run->io.data_offset,
2895 run->io.direction,
2896 run->io.size,
2897 run->io.count);
2898 ret = 0;
2899 break;
2900 case KVM_EXIT_MMIO:
2901 DPRINTF("handle_mmio\n");
2902
2903 address_space_rw(&address_space_memory,
2904 run->mmio.phys_addr, attrs,
2905 run->mmio.data,
2906 run->mmio.len,
2907 run->mmio.is_write);
2908 ret = 0;
2909 break;
2910 case KVM_EXIT_IRQ_WINDOW_OPEN:
2911 DPRINTF("irq_window_open\n");
2912 ret = EXCP_INTERRUPT;
2913 break;
2914 case KVM_EXIT_SHUTDOWN:
2915 DPRINTF("shutdown\n");
2916 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
2917 ret = EXCP_INTERRUPT;
2918 break;
2919 case KVM_EXIT_UNKNOWN:
2920 fprintf(stderr, "KVM: unknown exit, hardware reason %" PRIx64 "\n",
2921 (uint64_t)run->hw.hardware_exit_reason);
2922 ret = -1;
2923 break;
2924 case KVM_EXIT_INTERNAL_ERROR:
2925 ret = kvm_handle_internal_error(cpu, run);
2926 break;
2927 case KVM_EXIT_DIRTY_RING_FULL:
2928
2929
2930
2931
2932 trace_kvm_dirty_ring_full(cpu->cpu_index);
2933 qemu_mutex_lock_iothread();
2934 kvm_dirty_ring_reap(kvm_state);
2935 qemu_mutex_unlock_iothread();
2936 ret = 0;
2937 break;
2938 case KVM_EXIT_SYSTEM_EVENT:
2939 switch (run->system_event.type) {
2940 case KVM_SYSTEM_EVENT_SHUTDOWN:
2941 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
2942 ret = EXCP_INTERRUPT;
2943 break;
2944 case KVM_SYSTEM_EVENT_RESET:
2945 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
2946 ret = EXCP_INTERRUPT;
2947 break;
2948 case KVM_SYSTEM_EVENT_CRASH:
2949 kvm_cpu_synchronize_state(cpu);
2950 qemu_mutex_lock_iothread();
2951 qemu_system_guest_panicked(cpu_get_crash_info(cpu));
2952 qemu_mutex_unlock_iothread();
2953 ret = 0;
2954 break;
2955 default:
2956 DPRINTF("kvm_arch_handle_exit\n");
2957 ret = kvm_arch_handle_exit(cpu, run);
2958 break;
2959 }
2960 break;
2961 default:
2962 DPRINTF("kvm_arch_handle_exit\n");
2963 ret = kvm_arch_handle_exit(cpu, run);
2964 break;
2965 }
2966 } while (ret == 0);
2967
2968 cpu_exec_end(cpu);
2969 qemu_mutex_lock_iothread();
2970
2971 if (ret < 0) {
2972 cpu_dump_state(cpu, stderr, CPU_DUMP_CODE);
2973 vm_stop(RUN_STATE_INTERNAL_ERROR);
2974 }
2975
2976 qatomic_set(&cpu->exit_request, 0);
2977 return ret;
2978}
2979
2980int kvm_ioctl(KVMState *s, int type, ...)
2981{
2982 int ret;
2983 void *arg;
2984 va_list ap;
2985
2986 va_start(ap, type);
2987 arg = va_arg(ap, void *);
2988 va_end(ap);
2989
2990 trace_kvm_ioctl(type, arg);
2991 ret = ioctl(s->fd, type, arg);
2992 if (ret == -1) {
2993 ret = -errno;
2994 }
2995 return ret;
2996}
2997
2998int kvm_vm_ioctl(KVMState *s, int type, ...)
2999{
3000 int ret;
3001 void *arg;
3002 va_list ap;
3003
3004 va_start(ap, type);
3005 arg = va_arg(ap, void *);
3006 va_end(ap);
3007
3008 trace_kvm_vm_ioctl(type, arg);
3009 ret = ioctl(s->vmfd, type, arg);
3010 if (ret == -1) {
3011 ret = -errno;
3012 }
3013 return ret;
3014}
3015
3016int kvm_vcpu_ioctl(CPUState *cpu, int type, ...)
3017{
3018 int ret;
3019 void *arg;
3020 va_list ap;
3021
3022 va_start(ap, type);
3023 arg = va_arg(ap, void *);
3024 va_end(ap);
3025
3026 trace_kvm_vcpu_ioctl(cpu->cpu_index, type, arg);
3027 ret = ioctl(cpu->kvm_fd, type, arg);
3028 if (ret == -1) {
3029 ret = -errno;
3030 }
3031 return ret;
3032}
3033
3034int kvm_device_ioctl(int fd, int type, ...)
3035{
3036 int ret;
3037 void *arg;
3038 va_list ap;
3039
3040 va_start(ap, type);
3041 arg = va_arg(ap, void *);
3042 va_end(ap);
3043
3044 trace_kvm_device_ioctl(fd, type, arg);
3045 ret = ioctl(fd, type, arg);
3046 if (ret == -1) {
3047 ret = -errno;
3048 }
3049 return ret;
3050}
3051
3052int kvm_vm_check_attr(KVMState *s, uint32_t group, uint64_t attr)
3053{
3054 int ret;
3055 struct kvm_device_attr attribute = {
3056 .group = group,
3057 .attr = attr,
3058 };
3059
3060 if (!kvm_vm_attributes_allowed) {
3061 return 0;
3062 }
3063
3064 ret = kvm_vm_ioctl(s, KVM_HAS_DEVICE_ATTR, &attribute);
3065
3066 return ret ? 0 : 1;
3067}
3068
3069int kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr)
3070{
3071 struct kvm_device_attr attribute = {
3072 .group = group,
3073 .attr = attr,
3074 .flags = 0,
3075 };
3076
3077 return kvm_device_ioctl(dev_fd, KVM_HAS_DEVICE_ATTR, &attribute) ? 0 : 1;
3078}
3079
3080int kvm_device_access(int fd, int group, uint64_t attr,
3081 void *val, bool write, Error **errp)
3082{
3083 struct kvm_device_attr kvmattr;
3084 int err;
3085
3086 kvmattr.flags = 0;
3087 kvmattr.group = group;
3088 kvmattr.attr = attr;
3089 kvmattr.addr = (uintptr_t)val;
3090
3091 err = kvm_device_ioctl(fd,
3092 write ? KVM_SET_DEVICE_ATTR : KVM_GET_DEVICE_ATTR,
3093 &kvmattr);
3094 if (err < 0) {
3095 error_setg_errno(errp, -err,
3096 "KVM_%s_DEVICE_ATTR failed: Group %d "
3097 "attr 0x%016" PRIx64,
3098 write ? "SET" : "GET", group, attr);
3099 }
3100 return err;
3101}
3102
3103bool kvm_has_sync_mmu(void)
3104{
3105 return kvm_state->sync_mmu;
3106}
3107
3108int kvm_has_vcpu_events(void)
3109{
3110 return kvm_state->vcpu_events;
3111}
3112
3113int kvm_has_robust_singlestep(void)
3114{
3115 return kvm_state->robust_singlestep;
3116}
3117
3118int kvm_has_debugregs(void)
3119{
3120 return kvm_state->debugregs;
3121}
3122
3123int kvm_max_nested_state_length(void)
3124{
3125 return kvm_state->max_nested_state_len;
3126}
3127
3128int kvm_has_many_ioeventfds(void)
3129{
3130 if (!kvm_enabled()) {
3131 return 0;
3132 }
3133 return kvm_state->many_ioeventfds;
3134}
3135
3136int kvm_has_gsi_routing(void)
3137{
3138#ifdef KVM_CAP_IRQ_ROUTING
3139 return kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING);
3140#else
3141 return false;
3142#endif
3143}
3144
3145int kvm_has_intx_set_mask(void)
3146{
3147 return kvm_state->intx_set_mask;
3148}
3149
3150bool kvm_arm_supports_user_irq(void)
3151{
3152 return kvm_check_extension(kvm_state, KVM_CAP_ARM_USER_IRQ);
3153}
3154
3155#ifdef KVM_CAP_SET_GUEST_DEBUG
3156struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *cpu,
3157 target_ulong pc)
3158{
3159 struct kvm_sw_breakpoint *bp;
3160
3161 QTAILQ_FOREACH(bp, &cpu->kvm_state->kvm_sw_breakpoints, entry) {
3162 if (bp->pc == pc) {
3163 return bp;
3164 }
3165 }
3166 return NULL;
3167}
3168
3169int kvm_sw_breakpoints_active(CPUState *cpu)
3170{
3171 return !QTAILQ_EMPTY(&cpu->kvm_state->kvm_sw_breakpoints);
3172}
3173
3174struct kvm_set_guest_debug_data {
3175 struct kvm_guest_debug dbg;
3176 int err;
3177};
3178
3179static void kvm_invoke_set_guest_debug(CPUState *cpu, run_on_cpu_data data)
3180{
3181 struct kvm_set_guest_debug_data *dbg_data =
3182 (struct kvm_set_guest_debug_data *) data.host_ptr;
3183
3184 dbg_data->err = kvm_vcpu_ioctl(cpu, KVM_SET_GUEST_DEBUG,
3185 &dbg_data->dbg);
3186}
3187
3188int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap)
3189{
3190 struct kvm_set_guest_debug_data data;
3191
3192 data.dbg.control = reinject_trap;
3193
3194 if (cpu->singlestep_enabled) {
3195 data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
3196 }
3197 kvm_arch_update_guest_debug(cpu, &data.dbg);
3198
3199 run_on_cpu(cpu, kvm_invoke_set_guest_debug,
3200 RUN_ON_CPU_HOST_PTR(&data));
3201 return data.err;
3202}
3203
3204int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,
3205 target_ulong len, int type)
3206{
3207 struct kvm_sw_breakpoint *bp;
3208 int err;
3209
3210 if (type == GDB_BREAKPOINT_SW) {
3211 bp = kvm_find_sw_breakpoint(cpu, addr);
3212 if (bp) {
3213 bp->use_count++;
3214 return 0;
3215 }
3216
3217 bp = g_malloc(sizeof(struct kvm_sw_breakpoint));
3218 bp->pc = addr;
3219 bp->use_count = 1;
3220 err = kvm_arch_insert_sw_breakpoint(cpu, bp);
3221 if (err) {
3222 g_free(bp);
3223 return err;
3224 }
3225
3226 QTAILQ_INSERT_HEAD(&cpu->kvm_state->kvm_sw_breakpoints, bp, entry);
3227 } else {
3228 err = kvm_arch_insert_hw_breakpoint(addr, len, type);
3229 if (err) {
3230 return err;
3231 }
3232 }
3233
3234 CPU_FOREACH(cpu) {
3235 err = kvm_update_guest_debug(cpu, 0);
3236 if (err) {
3237 return err;
3238 }
3239 }
3240 return 0;
3241}
3242
3243int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr,
3244 target_ulong len, int type)
3245{
3246 struct kvm_sw_breakpoint *bp;
3247 int err;
3248
3249 if (type == GDB_BREAKPOINT_SW) {
3250 bp = kvm_find_sw_breakpoint(cpu, addr);
3251 if (!bp) {
3252 return -ENOENT;
3253 }
3254
3255 if (bp->use_count > 1) {
3256 bp->use_count--;
3257 return 0;
3258 }
3259
3260 err = kvm_arch_remove_sw_breakpoint(cpu, bp);
3261 if (err) {
3262 return err;
3263 }
3264
3265 QTAILQ_REMOVE(&cpu->kvm_state->kvm_sw_breakpoints, bp, entry);
3266 g_free(bp);
3267 } else {
3268 err = kvm_arch_remove_hw_breakpoint(addr, len, type);
3269 if (err) {
3270 return err;
3271 }
3272 }
3273
3274 CPU_FOREACH(cpu) {
3275 err = kvm_update_guest_debug(cpu, 0);
3276 if (err) {
3277 return err;
3278 }
3279 }
3280 return 0;
3281}
3282
3283void kvm_remove_all_breakpoints(CPUState *cpu)
3284{
3285 struct kvm_sw_breakpoint *bp, *next;
3286 KVMState *s = cpu->kvm_state;
3287 CPUState *tmpcpu;
3288
3289 QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) {
3290 if (kvm_arch_remove_sw_breakpoint(cpu, bp) != 0) {
3291
3292 CPU_FOREACH(tmpcpu) {
3293 if (kvm_arch_remove_sw_breakpoint(tmpcpu, bp) == 0) {
3294 break;
3295 }
3296 }
3297 }
3298 QTAILQ_REMOVE(&s->kvm_sw_breakpoints, bp, entry);
3299 g_free(bp);
3300 }
3301 kvm_arch_remove_all_hw_breakpoints();
3302
3303 CPU_FOREACH(cpu) {
3304 kvm_update_guest_debug(cpu, 0);
3305 }
3306}
3307
3308#else
3309
3310int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap)
3311{
3312 return -EINVAL;
3313}
3314
3315int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,
3316 target_ulong len, int type)
3317{
3318 return -EINVAL;
3319}
3320
3321int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr,
3322 target_ulong len, int type)
3323{
3324 return -EINVAL;
3325}
3326
3327void kvm_remove_all_breakpoints(CPUState *cpu)
3328{
3329}
3330#endif
3331
3332static int kvm_set_signal_mask(CPUState *cpu, const sigset_t *sigset)
3333{
3334 KVMState *s = kvm_state;
3335 struct kvm_signal_mask *sigmask;
3336 int r;
3337
3338 sigmask = g_malloc(sizeof(*sigmask) + sizeof(*sigset));
3339
3340 sigmask->len = s->sigmask_len;
3341 memcpy(sigmask->sigset, sigset, sizeof(*sigset));
3342 r = kvm_vcpu_ioctl(cpu, KVM_SET_SIGNAL_MASK, sigmask);
3343 g_free(sigmask);
3344
3345 return r;
3346}
3347
3348static void kvm_ipi_signal(int sig)
3349{
3350 if (current_cpu) {
3351 assert(kvm_immediate_exit);
3352 kvm_cpu_kick(current_cpu);
3353 }
3354}
3355
3356void kvm_init_cpu_signals(CPUState *cpu)
3357{
3358 int r;
3359 sigset_t set;
3360 struct sigaction sigact;
3361
3362 memset(&sigact, 0, sizeof(sigact));
3363 sigact.sa_handler = kvm_ipi_signal;
3364 sigaction(SIG_IPI, &sigact, NULL);
3365
3366 pthread_sigmask(SIG_BLOCK, NULL, &set);
3367#if defined KVM_HAVE_MCE_INJECTION
3368 sigdelset(&set, SIGBUS);
3369 pthread_sigmask(SIG_SETMASK, &set, NULL);
3370#endif
3371 sigdelset(&set, SIG_IPI);
3372 if (kvm_immediate_exit) {
3373 r = pthread_sigmask(SIG_SETMASK, &set, NULL);
3374 } else {
3375 r = kvm_set_signal_mask(cpu, &set);
3376 }
3377 if (r) {
3378 fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
3379 exit(1);
3380 }
3381}
3382
3383
3384int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
3385{
3386#ifdef KVM_HAVE_MCE_INJECTION
3387 if (have_sigbus_pending) {
3388 return 1;
3389 }
3390 have_sigbus_pending = true;
3391 pending_sigbus_addr = addr;
3392 pending_sigbus_code = code;
3393 qatomic_set(&cpu->exit_request, 1);
3394 return 0;
3395#else
3396 return 1;
3397#endif
3398}
3399
3400
3401int kvm_on_sigbus(int code, void *addr)
3402{
3403#ifdef KVM_HAVE_MCE_INJECTION
3404
3405
3406
3407
3408 assert(code != BUS_MCEERR_AR);
3409 kvm_arch_on_sigbus_vcpu(first_cpu, code, addr);
3410 return 0;
3411#else
3412 return 1;
3413#endif
3414}
3415
3416int kvm_create_device(KVMState *s, uint64_t type, bool test)
3417{
3418 int ret;
3419 struct kvm_create_device create_dev;
3420
3421 create_dev.type = type;
3422 create_dev.fd = -1;
3423 create_dev.flags = test ? KVM_CREATE_DEVICE_TEST : 0;
3424
3425 if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) {
3426 return -ENOTSUP;
3427 }
3428
3429 ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &create_dev);
3430 if (ret) {
3431 return ret;
3432 }
3433
3434 return test ? 0 : create_dev.fd;
3435}
3436
3437bool kvm_device_supported(int vmfd, uint64_t type)
3438{
3439 struct kvm_create_device create_dev = {
3440 .type = type,
3441 .fd = -1,
3442 .flags = KVM_CREATE_DEVICE_TEST,
3443 };
3444
3445 if (ioctl(vmfd, KVM_CHECK_EXTENSION, KVM_CAP_DEVICE_CTRL) <= 0) {
3446 return false;
3447 }
3448
3449 return (ioctl(vmfd, KVM_CREATE_DEVICE, &create_dev) >= 0);
3450}
3451
3452int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source)
3453{
3454 struct kvm_one_reg reg;
3455 int r;
3456
3457 reg.id = id;
3458 reg.addr = (uintptr_t) source;
3459 r = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, ®);
3460 if (r) {
3461 trace_kvm_failed_reg_set(id, strerror(-r));
3462 }
3463 return r;
3464}
3465
3466int kvm_get_one_reg(CPUState *cs, uint64_t id, void *target)
3467{
3468 struct kvm_one_reg reg;
3469 int r;
3470
3471 reg.id = id;
3472 reg.addr = (uintptr_t) target;
3473 r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, ®);
3474 if (r) {
3475 trace_kvm_failed_reg_get(id, strerror(-r));
3476 }
3477 return r;
3478}
3479
3480static bool kvm_accel_has_memory(MachineState *ms, AddressSpace *as,
3481 hwaddr start_addr, hwaddr size)
3482{
3483 KVMState *kvm = KVM_STATE(ms->accelerator);
3484 int i;
3485
3486 for (i = 0; i < kvm->nr_as; ++i) {
3487 if (kvm->as[i].as == as && kvm->as[i].ml) {
3488 size = MIN(kvm_max_slot_size, size);
3489 return NULL != kvm_lookup_matching_slot(kvm->as[i].ml,
3490 start_addr, size);
3491 }
3492 }
3493
3494 return false;
3495}
3496
3497static void kvm_get_kvm_shadow_mem(Object *obj, Visitor *v,
3498 const char *name, void *opaque,
3499 Error **errp)
3500{
3501 KVMState *s = KVM_STATE(obj);
3502 int64_t value = s->kvm_shadow_mem;
3503
3504 visit_type_int(v, name, &value, errp);
3505}
3506
3507static void kvm_set_kvm_shadow_mem(Object *obj, Visitor *v,
3508 const char *name, void *opaque,
3509 Error **errp)
3510{
3511 KVMState *s = KVM_STATE(obj);
3512 int64_t value;
3513
3514 if (s->fd != -1) {
3515 error_setg(errp, "Cannot set properties after the accelerator has been initialized");
3516 return;
3517 }
3518
3519 if (!visit_type_int(v, name, &value, errp)) {
3520 return;
3521 }
3522
3523 s->kvm_shadow_mem = value;
3524}
3525
3526static void kvm_set_kernel_irqchip(Object *obj, Visitor *v,
3527 const char *name, void *opaque,
3528 Error **errp)
3529{
3530 KVMState *s = KVM_STATE(obj);
3531 OnOffSplit mode;
3532
3533 if (s->fd != -1) {
3534 error_setg(errp, "Cannot set properties after the accelerator has been initialized");
3535 return;
3536 }
3537
3538 if (!visit_type_OnOffSplit(v, name, &mode, errp)) {
3539 return;
3540 }
3541 switch (mode) {
3542 case ON_OFF_SPLIT_ON:
3543 s->kernel_irqchip_allowed = true;
3544 s->kernel_irqchip_required = true;
3545 s->kernel_irqchip_split = ON_OFF_AUTO_OFF;
3546 break;
3547 case ON_OFF_SPLIT_OFF:
3548 s->kernel_irqchip_allowed = false;
3549 s->kernel_irqchip_required = false;
3550 s->kernel_irqchip_split = ON_OFF_AUTO_OFF;
3551 break;
3552 case ON_OFF_SPLIT_SPLIT:
3553 s->kernel_irqchip_allowed = true;
3554 s->kernel_irqchip_required = true;
3555 s->kernel_irqchip_split = ON_OFF_AUTO_ON;
3556 break;
3557 default:
3558
3559
3560
3561 abort();
3562 }
3563}
3564
3565bool kvm_kernel_irqchip_allowed(void)
3566{
3567 return kvm_state->kernel_irqchip_allowed;
3568}
3569
3570bool kvm_kernel_irqchip_required(void)
3571{
3572 return kvm_state->kernel_irqchip_required;
3573}
3574
3575bool kvm_kernel_irqchip_split(void)
3576{
3577 return kvm_state->kernel_irqchip_split == ON_OFF_AUTO_ON;
3578}
3579
3580static void kvm_get_dirty_ring_size(Object *obj, Visitor *v,
3581 const char *name, void *opaque,
3582 Error **errp)
3583{
3584 KVMState *s = KVM_STATE(obj);
3585 uint32_t value = s->kvm_dirty_ring_size;
3586
3587 visit_type_uint32(v, name, &value, errp);
3588}
3589
3590static void kvm_set_dirty_ring_size(Object *obj, Visitor *v,
3591 const char *name, void *opaque,
3592 Error **errp)
3593{
3594 KVMState *s = KVM_STATE(obj);
3595 Error *error = NULL;
3596 uint32_t value;
3597
3598 if (s->fd != -1) {
3599 error_setg(errp, "Cannot set properties after the accelerator has been initialized");
3600 return;
3601 }
3602
3603 visit_type_uint32(v, name, &value, &error);
3604 if (error) {
3605 error_propagate(errp, error);
3606 return;
3607 }
3608 if (value & (value - 1)) {
3609 error_setg(errp, "dirty-ring-size must be a power of two.");
3610 return;
3611 }
3612
3613 s->kvm_dirty_ring_size = value;
3614}
3615
3616static void kvm_accel_instance_init(Object *obj)
3617{
3618 KVMState *s = KVM_STATE(obj);
3619
3620 s->fd = -1;
3621 s->vmfd = -1;
3622 s->kvm_shadow_mem = -1;
3623 s->kernel_irqchip_allowed = true;
3624 s->kernel_irqchip_split = ON_OFF_AUTO_AUTO;
3625
3626 s->kvm_dirty_ring_size = 0;
3627}
3628
3629static void kvm_accel_class_init(ObjectClass *oc, void *data)
3630{
3631 AccelClass *ac = ACCEL_CLASS(oc);
3632 ac->name = "KVM";
3633 ac->init_machine = kvm_init;
3634 ac->has_memory = kvm_accel_has_memory;
3635 ac->allowed = &kvm_allowed;
3636
3637 object_class_property_add(oc, "kernel-irqchip", "on|off|split",
3638 NULL, kvm_set_kernel_irqchip,
3639 NULL, NULL);
3640 object_class_property_set_description(oc, "kernel-irqchip",
3641 "Configure KVM in-kernel irqchip");
3642
3643 object_class_property_add(oc, "kvm-shadow-mem", "int",
3644 kvm_get_kvm_shadow_mem, kvm_set_kvm_shadow_mem,
3645 NULL, NULL);
3646 object_class_property_set_description(oc, "kvm-shadow-mem",
3647 "KVM shadow MMU size");
3648
3649 object_class_property_add(oc, "dirty-ring-size", "uint32",
3650 kvm_get_dirty_ring_size, kvm_set_dirty_ring_size,
3651 NULL, NULL);
3652 object_class_property_set_description(oc, "dirty-ring-size",
3653 "Size of KVM dirty page ring buffer (default: 0, i.e. use bitmap)");
3654}
3655
3656static const TypeInfo kvm_accel_type = {
3657 .name = TYPE_KVM_ACCEL,
3658 .parent = TYPE_ACCEL,
3659 .instance_init = kvm_accel_instance_init,
3660 .class_init = kvm_accel_class_init,
3661 .instance_size = sizeof(KVMState),
3662};
3663
3664static void kvm_type_init(void)
3665{
3666 type_register_static(&kvm_accel_type);
3667}
3668
3669type_init(kvm_type_init);
3670