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MAINTAINERS: Make section QOM cover hw/core/*bus.c as well
[qemu/armbru.git] / accel / kvm / kvm-all.c
blobf24d7da783a09e1f1e3b222d7eeb4bf5275d5446
1 /*
2 * QEMU KVM support
3 *
4 * Copyright IBM, Corp. 2008
5 * Red Hat, Inc. 2008
6 *
7 * Authors:
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Glauber Costa <gcosta@redhat.com>
10 *
11 * This work is licensed under the terms of the GNU GPL, version 2 or later.
12 * See the COPYING file in the top-level directory.
13 *
14 */
15
16 #include "qemu/osdep.h"
17 #include <sys/ioctl.h>
18
19 #include <linux/kvm.h>
20
21 #include "qemu/atomic.h"
22 #include "qemu/option.h"
23 #include "qemu/config-file.h"
24 #include "qemu/error-report.h"
25 #include "qapi/error.h"
26 #include "hw/pci/msi.h"
27 #include "hw/pci/msix.h"
28 #include "hw/s390x/adapter.h"
29 #include "exec/gdbstub.h"
30 #include "sysemu/kvm_int.h"
31 #include "sysemu/runstate.h"
32 #include "sysemu/cpus.h"
33 #include "sysemu/sysemu.h"
34 #include "qemu/bswap.h"
35 #include "exec/memory.h"
36 #include "exec/ram_addr.h"
37 #include "exec/address-spaces.h"
38 #include "qemu/event_notifier.h"
39 #include "qemu/main-loop.h"
40 #include "trace.h"
41 #include "hw/irq.h"
42 #include "sysemu/sev.h"
43 #include "sysemu/balloon.h"
44 #include "qapi/visitor.h"
45 #include "qapi/qapi-types-common.h"
46 #include "qapi/qapi-visit-common.h"
47 #include "sysemu/reset.h"
48
49 #include "hw/boards.h"
50
51 /* This check must be after config-host.h is included */
52 #ifdef CONFIG_EVENTFD
53 #include <sys/eventfd.h>
54 #endif
55
56 /* KVM uses PAGE_SIZE in its definition of KVM_COALESCED_MMIO_MAX. We
57 * need to use the real host PAGE_SIZE, as that's what KVM will use.
58 */
59 #define PAGE_SIZE qemu_real_host_page_size
60
61 //#define DEBUG_KVM
62
63 #ifdef DEBUG_KVM
64 #define DPRINTF(fmt, ...) \
65 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
66 #else
67 #define DPRINTF(fmt, ...) \
68 do { } while (0)
69 #endif
70
71 #define KVM_MSI_HASHTAB_SIZE 256
72
73 struct KVMParkedVcpu {
74 unsigned long vcpu_id;
75 int kvm_fd;
76 QLIST_ENTRY(KVMParkedVcpu) node;
77 };
78
79 struct KVMState
80 {
81 AccelState parent_obj;
82
83 int nr_slots;
84 int fd;
85 int vmfd;
86 int coalesced_mmio;
87 int coalesced_pio;
88 struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
89 bool coalesced_flush_in_progress;
90 int vcpu_events;
91 int robust_singlestep;
92 int debugregs;
93 #ifdef KVM_CAP_SET_GUEST_DEBUG
94 QTAILQ_HEAD(, kvm_sw_breakpoint) kvm_sw_breakpoints;
95 #endif
96 int max_nested_state_len;
97 int many_ioeventfds;
98 int intx_set_mask;
99 int kvm_shadow_mem;
100 bool kernel_irqchip_allowed;
101 bool kernel_irqchip_required;
102 OnOffAuto kernel_irqchip_split;
103 bool sync_mmu;
104 bool manual_dirty_log_protect;
105 /* The man page (and posix) say ioctl numbers are signed int, but
106 * they're not. Linux, glibc and *BSD all treat ioctl numbers as
107 * unsigned, and treating them as signed here can break things */
108 unsigned irq_set_ioctl;
109 unsigned int sigmask_len;
110 GHashTable *gsimap;
111 #ifdef KVM_CAP_IRQ_ROUTING
112 struct kvm_irq_routing *irq_routes;
113 int nr_allocated_irq_routes;
114 unsigned long *used_gsi_bitmap;
115 unsigned int gsi_count;
116 QTAILQ_HEAD(, KVMMSIRoute) msi_hashtab[KVM_MSI_HASHTAB_SIZE];
117 #endif
118 KVMMemoryListener memory_listener;
119 QLIST_HEAD(, KVMParkedVcpu) kvm_parked_vcpus;
120
121 /* memory encryption */
122 void *memcrypt_handle;
123 int (*memcrypt_encrypt_data)(void *handle, uint8_t *ptr, uint64_t len);
124
125 /* For "info mtree -f" to tell if an MR is registered in KVM */
126 int nr_as;
127 struct KVMAs {
128 KVMMemoryListener *ml;
129 AddressSpace *as;
130 } *as;
131 };
132
133 KVMState *kvm_state;
134 bool kvm_kernel_irqchip;
135 bool kvm_split_irqchip;
136 bool kvm_async_interrupts_allowed;
137 bool kvm_halt_in_kernel_allowed;
138 bool kvm_eventfds_allowed;
139 bool kvm_irqfds_allowed;
140 bool kvm_resamplefds_allowed;
141 bool kvm_msi_via_irqfd_allowed;
142 bool kvm_gsi_routing_allowed;
143 bool kvm_gsi_direct_mapping;
144 bool kvm_allowed;
145 bool kvm_readonly_mem_allowed;
146 bool kvm_vm_attributes_allowed;
147 bool kvm_direct_msi_allowed;
148 bool kvm_ioeventfd_any_length_allowed;
149 bool kvm_msi_use_devid;
150 static bool kvm_immediate_exit;
151 static hwaddr kvm_max_slot_size = ~0;
152
153 static const KVMCapabilityInfo kvm_required_capabilites[] = {
154 KVM_CAP_INFO(USER_MEMORY),
155 KVM_CAP_INFO(DESTROY_MEMORY_REGION_WORKS),
156 KVM_CAP_INFO(JOIN_MEMORY_REGIONS_WORKS),
157 KVM_CAP_LAST_INFO
158 };
159
160 static NotifierList kvm_irqchip_change_notifiers =
161 NOTIFIER_LIST_INITIALIZER(kvm_irqchip_change_notifiers);
162
163 struct KVMResampleFd {
164 int gsi;
165 EventNotifier *resample_event;
166 QLIST_ENTRY(KVMResampleFd) node;
167 };
168 typedef struct KVMResampleFd KVMResampleFd;
169
170 /*
171 * Only used with split irqchip where we need to do the resample fd
172 * kick for the kernel from userspace.
173 */
174 static QLIST_HEAD(, KVMResampleFd) kvm_resample_fd_list =
175 QLIST_HEAD_INITIALIZER(kvm_resample_fd_list);
176
177 #define kvm_slots_lock(kml) qemu_mutex_lock(&(kml)->slots_lock)
178 #define kvm_slots_unlock(kml) qemu_mutex_unlock(&(kml)->slots_lock)
179
180 static inline void kvm_resample_fd_remove(int gsi)
181 {
182 KVMResampleFd *rfd;
183
184 QLIST_FOREACH(rfd, &kvm_resample_fd_list, node) {
185 if (rfd->gsi == gsi) {
186 QLIST_REMOVE(rfd, node);
187 g_free(rfd);
188 break;
189 }
190 }
191 }
192
193 static inline void kvm_resample_fd_insert(int gsi, EventNotifier *event)
194 {
195 KVMResampleFd *rfd = g_new0(KVMResampleFd, 1);
196
197 rfd->gsi = gsi;
198 rfd->resample_event = event;
199
200 QLIST_INSERT_HEAD(&kvm_resample_fd_list, rfd, node);
201 }
202
203 void kvm_resample_fd_notify(int gsi)
204 {
205 KVMResampleFd *rfd;
206
207 QLIST_FOREACH(rfd, &kvm_resample_fd_list, node) {
208 if (rfd->gsi == gsi) {
209 event_notifier_set(rfd->resample_event);
210 trace_kvm_resample_fd_notify(gsi);
211 return;
212 }
213 }
214 }
215
216 int kvm_get_max_memslots(void)
217 {
218 KVMState *s = KVM_STATE(current_accel());
219
220 return s->nr_slots;
221 }
222
223 bool kvm_memcrypt_enabled(void)
224 {
225 if (kvm_state && kvm_state->memcrypt_handle) {
226 return true;
227 }
228
229 return false;
230 }
231
232 int kvm_memcrypt_encrypt_data(uint8_t *ptr, uint64_t len)
233 {
234 if (kvm_state->memcrypt_handle &&
235 kvm_state->memcrypt_encrypt_data) {
236 return kvm_state->memcrypt_encrypt_data(kvm_state->memcrypt_handle,
237 ptr, len);
238 }
239
240 return 1;
241 }
242
243 /* Called with KVMMemoryListener.slots_lock held */
244 static KVMSlot *kvm_get_free_slot(KVMMemoryListener *kml)
245 {
246 KVMState *s = kvm_state;
247 int i;
248
249 for (i = 0; i < s->nr_slots; i++) {
250 if (kml->slots[i].memory_size == 0) {
251 return &kml->slots[i];
252 }
253 }
254
255 return NULL;
256 }
257
258 bool kvm_has_free_slot(MachineState *ms)
259 {
260 KVMState *s = KVM_STATE(ms->accelerator);
261 bool result;
262 KVMMemoryListener *kml = &s->memory_listener;
263
264 kvm_slots_lock(kml);
265 result = !!kvm_get_free_slot(kml);
266 kvm_slots_unlock(kml);
267
268 return result;
269 }
270
271 /* Called with KVMMemoryListener.slots_lock held */
272 static KVMSlot *kvm_alloc_slot(KVMMemoryListener *kml)
273 {
274 KVMSlot *slot = kvm_get_free_slot(kml);
275
276 if (slot) {
277 return slot;
278 }
279
280 fprintf(stderr, "%s: no free slot available\n", __func__);
281 abort();
282 }
283
284 static KVMSlot *kvm_lookup_matching_slot(KVMMemoryListener *kml,
285 hwaddr start_addr,
286 hwaddr size)
287 {
288 KVMState *s = kvm_state;
289 int i;
290
291 for (i = 0; i < s->nr_slots; i++) {
292 KVMSlot *mem = &kml->slots[i];
293
294 if (start_addr == mem->start_addr && size == mem->memory_size) {
295 return mem;
296 }
297 }
298
299 return NULL;
300 }
301
302 /*
303 * Calculate and align the start address and the size of the section.
304 * Return the size. If the size is 0, the aligned section is empty.
305 */
306 static hwaddr kvm_align_section(MemoryRegionSection *section,
307 hwaddr *start)
308 {
309 hwaddr size = int128_get64(section->size);
310 hwaddr delta, aligned;
311
312 /* kvm works in page size chunks, but the function may be called
313 with sub-page size and unaligned start address. Pad the start
314 address to next and truncate size to previous page boundary. */
315 aligned = ROUND_UP(section->offset_within_address_space,
316 qemu_real_host_page_size);
317 delta = aligned - section->offset_within_address_space;
318 *start = aligned;
319 if (delta > size) {
320 return 0;
321 }
322
323 return (size - delta) & qemu_real_host_page_mask;
324 }
325
326 int kvm_physical_memory_addr_from_host(KVMState *s, void *ram,
327 hwaddr *phys_addr)
328 {
329 KVMMemoryListener *kml = &s->memory_listener;
330 int i, ret = 0;
331
332 kvm_slots_lock(kml);
333 for (i = 0; i < s->nr_slots; i++) {
334 KVMSlot *mem = &kml->slots[i];
335
336 if (ram >= mem->ram && ram < mem->ram + mem->memory_size) {
337 *phys_addr = mem->start_addr + (ram - mem->ram);
338 ret = 1;
339 break;
340 }
341 }
342 kvm_slots_unlock(kml);
343
344 return ret;
345 }
346
347 static int kvm_set_user_memory_region(KVMMemoryListener *kml, KVMSlot *slot, bool new)
348 {
349 KVMState *s = kvm_state;
350 struct kvm_userspace_memory_region mem;
351 int ret;
352
353 mem.slot = slot->slot | (kml->as_id << 16);
354 mem.guest_phys_addr = slot->start_addr;
355 mem.userspace_addr = (unsigned long)slot->ram;
356 mem.flags = slot->flags;
357
358 if (slot->memory_size && !new && (mem.flags ^ slot->old_flags) & KVM_MEM_READONLY) {
359 /* Set the slot size to 0 before setting the slot to the desired
360 * value. This is needed based on KVM commit 75d61fbc. */
361 mem.memory_size = 0;
362 ret = kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
363 if (ret < 0) {
364 goto err;
365 }
366 }
367 mem.memory_size = slot->memory_size;
368 ret = kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
369 slot->old_flags = mem.flags;
370 err:
371 trace_kvm_set_user_memory(mem.slot, mem.flags, mem.guest_phys_addr,
372 mem.memory_size, mem.userspace_addr, ret);
373 if (ret < 0) {
374 error_report("%s: KVM_SET_USER_MEMORY_REGION failed, slot=%d,"
375 " start=0x%" PRIx64 ", size=0x%" PRIx64 ": %s",
376 __func__, mem.slot, slot->start_addr,
377 (uint64_t)mem.memory_size, strerror(errno));
378 }
379 return ret;
380 }
381
382 int kvm_destroy_vcpu(CPUState *cpu)
383 {
384 KVMState *s = kvm_state;
385 long mmap_size;
386 struct KVMParkedVcpu *vcpu = NULL;
387 int ret = 0;
388
389 DPRINTF("kvm_destroy_vcpu\n");
390
391 ret = kvm_arch_destroy_vcpu(cpu);
392 if (ret < 0) {
393 goto err;
394 }
395
396 mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
397 if (mmap_size < 0) {
398 ret = mmap_size;
399 DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
400 goto err;
401 }
402
403 ret = munmap(cpu->kvm_run, mmap_size);
404 if (ret < 0) {
405 goto err;
406 }
407
408 vcpu = g_malloc0(sizeof(*vcpu));
409 vcpu->vcpu_id = kvm_arch_vcpu_id(cpu);
410 vcpu->kvm_fd = cpu->kvm_fd;
411 QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node);
412 err:
413 return ret;
414 }
415
416 static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id)
417 {
418 struct KVMParkedVcpu *cpu;
419
420 QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) {
421 if (cpu->vcpu_id == vcpu_id) {
422 int kvm_fd;
423
424 QLIST_REMOVE(cpu, node);
425 kvm_fd = cpu->kvm_fd;
426 g_free(cpu);
427 return kvm_fd;
428 }
429 }
430
431 return kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id);
432 }
433
434 int kvm_init_vcpu(CPUState *cpu)
435 {
436 KVMState *s = kvm_state;
437 long mmap_size;
438 int ret;
439
440 DPRINTF("kvm_init_vcpu\n");
441
442 ret = kvm_get_vcpu(s, kvm_arch_vcpu_id(cpu));
443 if (ret < 0) {
444 DPRINTF("kvm_create_vcpu failed\n");
445 goto err;
446 }
447
448 cpu->kvm_fd = ret;
449 cpu->kvm_state = s;
450 cpu->vcpu_dirty = true;
451
452 mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
453 if (mmap_size < 0) {
454 ret = mmap_size;
455 DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
456 goto err;
457 }
458
459 cpu->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
460 cpu->kvm_fd, 0);
461 if (cpu->kvm_run == MAP_FAILED) {
462 ret = -errno;
463 DPRINTF("mmap'ing vcpu state failed\n");
464 goto err;
465 }
466
467 if (s->coalesced_mmio && !s->coalesced_mmio_ring) {
468 s->coalesced_mmio_ring =
469 (void *)cpu->kvm_run + s->coalesced_mmio * PAGE_SIZE;
470 }
471
472 ret = kvm_arch_init_vcpu(cpu);
473 err:
474 return ret;
475 }
476
477 /*
478 * dirty pages logging control
479 */
480
481 static int kvm_mem_flags(MemoryRegion *mr)
482 {
483 bool readonly = mr->readonly || memory_region_is_romd(mr);
484 int flags = 0;
485
486 if (memory_region_get_dirty_log_mask(mr) != 0) {
487 flags |= KVM_MEM_LOG_DIRTY_PAGES;
488 }
489 if (readonly && kvm_readonly_mem_allowed) {
490 flags |= KVM_MEM_READONLY;
491 }
492 return flags;
493 }
494
495 /* Called with KVMMemoryListener.slots_lock held */
496 static int kvm_slot_update_flags(KVMMemoryListener *kml, KVMSlot *mem,
497 MemoryRegion *mr)
498 {
499 mem->flags = kvm_mem_flags(mr);
500
501 /* If nothing changed effectively, no need to issue ioctl */
502 if (mem->flags == mem->old_flags) {
503 return 0;
504 }
505
506 return kvm_set_user_memory_region(kml, mem, false);
507 }
508
509 static int kvm_section_update_flags(KVMMemoryListener *kml,
510 MemoryRegionSection *section)
511 {
512 hwaddr start_addr, size, slot_size;
513 KVMSlot *mem;
514 int ret = 0;
515
516 size = kvm_align_section(section, &start_addr);
517 if (!size) {
518 return 0;
519 }
520
521 kvm_slots_lock(kml);
522
523 while (size && !ret) {
524 slot_size = MIN(kvm_max_slot_size, size);
525 mem = kvm_lookup_matching_slot(kml, start_addr, slot_size);
526 if (!mem) {
527 /* We don't have a slot if we want to trap every access. */
528 goto out;
529 }
530
531 ret = kvm_slot_update_flags(kml, mem, section->mr);
532 start_addr += slot_size;
533 size -= slot_size;
534 }
535
536 out:
537 kvm_slots_unlock(kml);
538 return ret;
539 }
540
541 static void kvm_log_start(MemoryListener *listener,
542 MemoryRegionSection *section,
543 int old, int new)
544 {
545 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
546 int r;
547
548 if (old != 0) {
549 return;
550 }
551
552 r = kvm_section_update_flags(kml, section);
553 if (r < 0) {
554 abort();
555 }
556 }
557
558 static void kvm_log_stop(MemoryListener *listener,
559 MemoryRegionSection *section,
560 int old, int new)
561 {
562 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
563 int r;
564
565 if (new != 0) {
566 return;
567 }
568
569 r = kvm_section_update_flags(kml, section);
570 if (r < 0) {
571 abort();
572 }
573 }
574
575 /* get kvm's dirty pages bitmap and update qemu's */
576 static int kvm_get_dirty_pages_log_range(MemoryRegionSection *section,
577 unsigned long *bitmap)
578 {
579 ram_addr_t start = section->offset_within_region +
580 memory_region_get_ram_addr(section->mr);
581 ram_addr_t pages = int128_get64(section->size) / qemu_real_host_page_size;
582
583 cpu_physical_memory_set_dirty_lebitmap(bitmap, start, pages);
584 return 0;
585 }
586
587 #define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
588
589 /* Allocate the dirty bitmap for a slot */
590 static void kvm_memslot_init_dirty_bitmap(KVMSlot *mem)
591 {
592 /*
593 * XXX bad kernel interface alert
594 * For dirty bitmap, kernel allocates array of size aligned to
595 * bits-per-long. But for case when the kernel is 64bits and
596 * the userspace is 32bits, userspace can't align to the same
597 * bits-per-long, since sizeof(long) is different between kernel
598 * and user space. This way, userspace will provide buffer which
599 * may be 4 bytes less than the kernel will use, resulting in
600 * userspace memory corruption (which is not detectable by valgrind
601 * too, in most cases).
602 * So for now, let's align to 64 instead of HOST_LONG_BITS here, in
603 * a hope that sizeof(long) won't become >8 any time soon.
604 */
605 hwaddr bitmap_size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS),
606 /*HOST_LONG_BITS*/ 64) / 8;
607 mem->dirty_bmap = g_malloc0(bitmap_size);
608 }
609
610 /**
611 * kvm_physical_sync_dirty_bitmap - Sync dirty bitmap from kernel space
612 *
613 * This function will first try to fetch dirty bitmap from the kernel,
614 * and then updates qemu's dirty bitmap.
615 *
616 * NOTE: caller must be with kml->slots_lock held.
617 *
618 * @kml: the KVM memory listener object
619 * @section: the memory section to sync the dirty bitmap with
620 */
621 static int kvm_physical_sync_dirty_bitmap(KVMMemoryListener *kml,
622 MemoryRegionSection *section)
623 {
624 KVMState *s = kvm_state;
625 struct kvm_dirty_log d = {};
626 KVMSlot *mem;
627 hwaddr start_addr, size;
628 hwaddr slot_size, slot_offset = 0;
629 int ret = 0;
630
631 size = kvm_align_section(section, &start_addr);
632 while (size) {
633 MemoryRegionSection subsection = *section;
634
635 slot_size = MIN(kvm_max_slot_size, size);
636 mem = kvm_lookup_matching_slot(kml, start_addr, slot_size);
637 if (!mem) {
638 /* We don't have a slot if we want to trap every access. */
639 goto out;
640 }
641
642 if (!mem->dirty_bmap) {
643 /* Allocate on the first log_sync, once and for all */
644 kvm_memslot_init_dirty_bitmap(mem);
645 }
646
647 d.dirty_bitmap = mem->dirty_bmap;
648 d.slot = mem->slot | (kml->as_id << 16);
649 if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
650 DPRINTF("ioctl failed %d\n", errno);
651 ret = -1;
652 goto out;
653 }
654
655 subsection.offset_within_region += slot_offset;
656 subsection.size = int128_make64(slot_size);
657 kvm_get_dirty_pages_log_range(&subsection, d.dirty_bitmap);
658
659 slot_offset += slot_size;
660 start_addr += slot_size;
661 size -= slot_size;
662 }
663 out:
664 return ret;
665 }
666
667 /* Alignment requirement for KVM_CLEAR_DIRTY_LOG - 64 pages */
668 #define KVM_CLEAR_LOG_SHIFT 6
669 #define KVM_CLEAR_LOG_ALIGN (qemu_real_host_page_size << KVM_CLEAR_LOG_SHIFT)
670 #define KVM_CLEAR_LOG_MASK (-KVM_CLEAR_LOG_ALIGN)
671
672 static int kvm_log_clear_one_slot(KVMSlot *mem, int as_id, uint64_t start,
673 uint64_t size)
674 {
675 KVMState *s = kvm_state;
676 uint64_t end, bmap_start, start_delta, bmap_npages;
677 struct kvm_clear_dirty_log d;
678 unsigned long *bmap_clear = NULL, psize = qemu_real_host_page_size;
679 int ret;
680
681 /*
682 * We need to extend either the start or the size or both to
683 * satisfy the KVM interface requirement. Firstly, do the start
684 * page alignment on 64 host pages
685 */
686 bmap_start = start & KVM_CLEAR_LOG_MASK;
687 start_delta = start - bmap_start;
688 bmap_start /= psize;
689
690 /*
691 * The kernel interface has restriction on the size too, that either:
692 *
693 * (1) the size is 64 host pages aligned (just like the start), or
694 * (2) the size fills up until the end of the KVM memslot.
695 */
696 bmap_npages = DIV_ROUND_UP(size + start_delta, KVM_CLEAR_LOG_ALIGN)
697 << KVM_CLEAR_LOG_SHIFT;
698 end = mem->memory_size / psize;
699 if (bmap_npages > end - bmap_start) {
700 bmap_npages = end - bmap_start;
701 }
702 start_delta /= psize;
703
704 /*
705 * Prepare the bitmap to clear dirty bits. Here we must guarantee
706 * that we won't clear any unknown dirty bits otherwise we might
707 * accidentally clear some set bits which are not yet synced from
708 * the kernel into QEMU's bitmap, then we'll lose track of the
709 * guest modifications upon those pages (which can directly lead
710 * to guest data loss or panic after migration).
711 *
712 * Layout of the KVMSlot.dirty_bmap:
713 *
714 * |<-------- bmap_npages -----------..>|
715 * [1]
716 * start_delta size
717 * |----------------|-------------|------------------|------------|
718 * ^ ^ ^ ^
719 * | | | |
720 * start bmap_start (start) end
721 * of memslot of memslot
722 *
723 * [1] bmap_npages can be aligned to either 64 pages or the end of slot
724 */
725
726 assert(bmap_start % BITS_PER_LONG == 0);
727 /* We should never do log_clear before log_sync */
728 assert(mem->dirty_bmap);
729 if (start_delta) {
730 /* Slow path - we need to manipulate a temp bitmap */
731 bmap_clear = bitmap_new(bmap_npages);
732 bitmap_copy_with_src_offset(bmap_clear, mem->dirty_bmap,
733 bmap_start, start_delta + size / psize);
734 /*
735 * We need to fill the holes at start because that was not
736 * specified by the caller and we extended the bitmap only for
737 * 64 pages alignment
738 */
739 bitmap_clear(bmap_clear, 0, start_delta);
740 d.dirty_bitmap = bmap_clear;
741 } else {
742 /* Fast path - start address aligns well with BITS_PER_LONG */
743 d.dirty_bitmap = mem->dirty_bmap + BIT_WORD(bmap_start);
744 }
745
746 d.first_page = bmap_start;
747 /* It should never overflow. If it happens, say something */
748 assert(bmap_npages <= UINT32_MAX);
749 d.num_pages = bmap_npages;
750 d.slot = mem->slot | (as_id << 16);
751
752 if (kvm_vm_ioctl(s, KVM_CLEAR_DIRTY_LOG, &d) == -1) {
753 ret = -errno;
754 error_report("%s: KVM_CLEAR_DIRTY_LOG failed, slot=%d, "
755 "start=0x%"PRIx64", size=0x%"PRIx32", errno=%d",
756 __func__, d.slot, (uint64_t)d.first_page,
757 (uint32_t)d.num_pages, ret);
758 } else {
759 ret = 0;
760 trace_kvm_clear_dirty_log(d.slot, d.first_page, d.num_pages);
761 }
762
763 /*
764 * After we have updated the remote dirty bitmap, we update the
765 * cached bitmap as well for the memslot, then if another user
766 * clears the same region we know we shouldn't clear it again on
767 * the remote otherwise it's data loss as well.
768 */
769 bitmap_clear(mem->dirty_bmap, bmap_start + start_delta,
770 size / psize);
771 /* This handles the NULL case well */
772 g_free(bmap_clear);
773 return ret;
774 }
775
776
777 /**
778 * kvm_physical_log_clear - Clear the kernel's dirty bitmap for range
779 *
780 * NOTE: this will be a no-op if we haven't enabled manual dirty log
781 * protection in the host kernel because in that case this operation
782 * will be done within log_sync().
783 *
784 * @kml: the kvm memory listener
785 * @section: the memory range to clear dirty bitmap
786 */
787 static int kvm_physical_log_clear(KVMMemoryListener *kml,
788 MemoryRegionSection *section)
789 {
790 KVMState *s = kvm_state;
791 uint64_t start, size, offset, count;
792 KVMSlot *mem;
793 int ret = 0, i;
794
795 if (!s->manual_dirty_log_protect) {
796 /* No need to do explicit clear */
797 return ret;
798 }
799
800 start = section->offset_within_address_space;
801 size = int128_get64(section->size);
802
803 if (!size) {
804 /* Nothing more we can do... */
805 return ret;
806 }
807
808 kvm_slots_lock(kml);
809
810 for (i = 0; i < s->nr_slots; i++) {
811 mem = &kml->slots[i];
812 /* Discard slots that are empty or do not overlap the section */
813 if (!mem->memory_size ||
814 mem->start_addr > start + size - 1 ||
815 start > mem->start_addr + mem->memory_size - 1) {
816 continue;
817 }
818
819 if (start >= mem->start_addr) {
820 /* The slot starts before section or is aligned to it. */
821 offset = start - mem->start_addr;
822 count = MIN(mem->memory_size - offset, size);
823 } else {
824 /* The slot starts after section. */
825 offset = 0;
826 count = MIN(mem->memory_size, size - (mem->start_addr - start));
827 }
828 ret = kvm_log_clear_one_slot(mem, kml->as_id, offset, count);
829 if (ret < 0) {
830 break;
831 }
832 }
833
834 kvm_slots_unlock(kml);
835
836 return ret;
837 }
838
839 static void kvm_coalesce_mmio_region(MemoryListener *listener,
840 MemoryRegionSection *secion,
841 hwaddr start, hwaddr size)
842 {
843 KVMState *s = kvm_state;
844
845 if (s->coalesced_mmio) {
846 struct kvm_coalesced_mmio_zone zone;
847
848 zone.addr = start;
849 zone.size = size;
850 zone.pad = 0;
851
852 (void)kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
853 }
854 }
855
856 static void kvm_uncoalesce_mmio_region(MemoryListener *listener,
857 MemoryRegionSection *secion,
858 hwaddr start, hwaddr size)
859 {
860 KVMState *s = kvm_state;
861
862 if (s->coalesced_mmio) {
863 struct kvm_coalesced_mmio_zone zone;
864
865 zone.addr = start;
866 zone.size = size;
867 zone.pad = 0;
868
869 (void)kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
870 }
871 }
872
873 static void kvm_coalesce_pio_add(MemoryListener *listener,
874 MemoryRegionSection *section,
875 hwaddr start, hwaddr size)
876 {
877 KVMState *s = kvm_state;
878
879 if (s->coalesced_pio) {
880 struct kvm_coalesced_mmio_zone zone;
881
882 zone.addr = start;
883 zone.size = size;
884 zone.pio = 1;
885
886 (void)kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
887 }
888 }
889
890 static void kvm_coalesce_pio_del(MemoryListener *listener,
891 MemoryRegionSection *section,
892 hwaddr start, hwaddr size)
893 {
894 KVMState *s = kvm_state;
895
896 if (s->coalesced_pio) {
897 struct kvm_coalesced_mmio_zone zone;
898
899 zone.addr = start;
900 zone.size = size;
901 zone.pio = 1;
902
903 (void)kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
904 }
905 }
906
907 static MemoryListener kvm_coalesced_pio_listener = {
908 .coalesced_io_add = kvm_coalesce_pio_add,
909 .coalesced_io_del = kvm_coalesce_pio_del,
910 };
911
912 int kvm_check_extension(KVMState *s, unsigned int extension)
913 {
914 int ret;
915
916 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension);
917 if (ret < 0) {
918 ret = 0;
919 }
920
921 return ret;
922 }
923
924 int kvm_vm_check_extension(KVMState *s, unsigned int extension)
925 {
926 int ret;
927
928 ret = kvm_vm_ioctl(s, KVM_CHECK_EXTENSION, extension);
929 if (ret < 0) {
930 /* VM wide version not implemented, use global one instead */
931 ret = kvm_check_extension(s, extension);
932 }
933
934 return ret;
935 }
936
937 typedef struct HWPoisonPage {
938 ram_addr_t ram_addr;
939 QLIST_ENTRY(HWPoisonPage) list;
940 } HWPoisonPage;
941
942 static QLIST_HEAD(, HWPoisonPage) hwpoison_page_list =
943 QLIST_HEAD_INITIALIZER(hwpoison_page_list);
944
945 static void kvm_unpoison_all(void *param)
946 {
947 HWPoisonPage *page, *next_page;
948
949 QLIST_FOREACH_SAFE(page, &hwpoison_page_list, list, next_page) {
950 QLIST_REMOVE(page, list);
951 qemu_ram_remap(page->ram_addr, TARGET_PAGE_SIZE);
952 g_free(page);
953 }
954 }
955
956 void kvm_hwpoison_page_add(ram_addr_t ram_addr)
957 {
958 HWPoisonPage *page;
959
960 QLIST_FOREACH(page, &hwpoison_page_list, list) {
961 if (page->ram_addr == ram_addr) {
962 return;
963 }
964 }
965 page = g_new(HWPoisonPage, 1);
966 page->ram_addr = ram_addr;
967 QLIST_INSERT_HEAD(&hwpoison_page_list, page, list);
968 }
969
970 static uint32_t adjust_ioeventfd_endianness(uint32_t val, uint32_t size)
971 {
972 #if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
973 /* The kernel expects ioeventfd values in HOST_WORDS_BIGENDIAN
974 * endianness, but the memory core hands them in target endianness.
975 * For example, PPC is always treated as big-endian even if running
976 * on KVM and on PPC64LE. Correct here.
977 */
978 switch (size) {
979 case 2:
980 val = bswap16(val);
981 break;
982 case 4:
983 val = bswap32(val);
984 break;
985 }
986 #endif
987 return val;
988 }
989
990 static int kvm_set_ioeventfd_mmio(int fd, hwaddr addr, uint32_t val,
991 bool assign, uint32_t size, bool datamatch)
992 {
993 int ret;
994 struct kvm_ioeventfd iofd = {
995 .datamatch = datamatch ? adjust_ioeventfd_endianness(val, size) : 0,
996 .addr = addr,
997 .len = size,
998 .flags = 0,
999 .fd = fd,
1000 };
1001
1002 trace_kvm_set_ioeventfd_mmio(fd, (uint64_t)addr, val, assign, size,
1003 datamatch);
1004 if (!kvm_enabled()) {
1005 return -ENOSYS;
1006 }
1007
1008 if (datamatch) {
1009 iofd.flags |= KVM_IOEVENTFD_FLAG_DATAMATCH;
1010 }
1011 if (!assign) {
1012 iofd.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
1013 }
1014
1015 ret = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &iofd);
1016
1017 if (ret < 0) {
1018 return -errno;
1019 }
1020
1021 return 0;
1022 }
1023
1024 static int kvm_set_ioeventfd_pio(int fd, uint16_t addr, uint16_t val,
1025 bool assign, uint32_t size, bool datamatch)
1026 {
1027 struct kvm_ioeventfd kick = {
1028 .datamatch = datamatch ? adjust_ioeventfd_endianness(val, size) : 0,
1029 .addr = addr,
1030 .flags = KVM_IOEVENTFD_FLAG_PIO,
1031 .len = size,
1032 .fd = fd,
1033 };
1034 int r;
1035 trace_kvm_set_ioeventfd_pio(fd, addr, val, assign, size, datamatch);
1036 if (!kvm_enabled()) {
1037 return -ENOSYS;
1038 }
1039 if (datamatch) {
1040 kick.flags |= KVM_IOEVENTFD_FLAG_DATAMATCH;
1041 }
1042 if (!assign) {
1043 kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
1044 }
1045 r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
1046 if (r < 0) {
1047 return r;
1048 }
1049 return 0;
1050 }
1051
1052
1053 static int kvm_check_many_ioeventfds(void)
1054 {
1055 /* Userspace can use ioeventfd for io notification. This requires a host
1056 * that supports eventfd(2) and an I/O thread; since eventfd does not
1057 * support SIGIO it cannot interrupt the vcpu.
1058 *
1059 * Older kernels have a 6 device limit on the KVM io bus. Find out so we
1060 * can avoid creating too many ioeventfds.
1061 */
1062 #if defined(CONFIG_EVENTFD)
1063 int ioeventfds[7];
1064 int i, ret = 0;
1065 for (i = 0; i < ARRAY_SIZE(ioeventfds); i++) {
1066 ioeventfds[i] = eventfd(0, EFD_CLOEXEC);
1067 if (ioeventfds[i] < 0) {
1068 break;
1069 }
1070 ret = kvm_set_ioeventfd_pio(ioeventfds[i], 0, i, true, 2, true);
1071 if (ret < 0) {
1072 close(ioeventfds[i]);
1073 break;
1074 }
1075 }
1076
1077 /* Decide whether many devices are supported or not */
1078 ret = i == ARRAY_SIZE(ioeventfds);
1079
1080 while (i-- > 0) {
1081 kvm_set_ioeventfd_pio(ioeventfds[i], 0, i, false, 2, true);
1082 close(ioeventfds[i]);
1083 }
1084 return ret;
1085 #else
1086 return 0;
1087 #endif
1088 }
1089
1090 static const KVMCapabilityInfo *
1091 kvm_check_extension_list(KVMState *s, const KVMCapabilityInfo *list)
1092 {
1093 while (list->name) {
1094 if (!kvm_check_extension(s, list->value)) {
1095 return list;
1096 }
1097 list++;
1098 }
1099 return NULL;
1100 }
1101
1102 void kvm_set_max_memslot_size(hwaddr max_slot_size)
1103 {
1104 g_assert(
1105 ROUND_UP(max_slot_size, qemu_real_host_page_size) == max_slot_size
1106 );
1107 kvm_max_slot_size = max_slot_size;
1108 }
1109
1110 static void kvm_set_phys_mem(KVMMemoryListener *kml,
1111 MemoryRegionSection *section, bool add)
1112 {
1113 KVMSlot *mem;
1114 int err;
1115 MemoryRegion *mr = section->mr;
1116 bool writeable = !mr->readonly && !mr->rom_device;
1117 hwaddr start_addr, size, slot_size;
1118 void *ram;
1119
1120 if (!memory_region_is_ram(mr)) {
1121 if (writeable || !kvm_readonly_mem_allowed) {
1122 return;
1123 } else if (!mr->romd_mode) {
1124 /* If the memory device is not in romd_mode, then we actually want
1125 * to remove the kvm memory slot so all accesses will trap. */
1126 add = false;
1127 }
1128 }
1129
1130 size = kvm_align_section(section, &start_addr);
1131 if (!size) {
1132 return;
1133 }
1134
1135 /* use aligned delta to align the ram address */
1136 ram = memory_region_get_ram_ptr(mr) + section->offset_within_region +
1137 (start_addr - section->offset_within_address_space);
1138
1139 kvm_slots_lock(kml);
1140
1141 if (!add) {
1142 do {
1143 slot_size = MIN(kvm_max_slot_size, size);
1144 mem = kvm_lookup_matching_slot(kml, start_addr, slot_size);
1145 if (!mem) {
1146 goto out;
1147 }
1148 if (mem->flags & KVM_MEM_LOG_DIRTY_PAGES) {
1149 kvm_physical_sync_dirty_bitmap(kml, section);
1150 }
1151
1152 /* unregister the slot */
1153 g_free(mem->dirty_bmap);
1154 mem->dirty_bmap = NULL;
1155 mem->memory_size = 0;
1156 mem->flags = 0;
1157 err = kvm_set_user_memory_region(kml, mem, false);
1158 if (err) {
1159 fprintf(stderr, "%s: error unregistering slot: %s\n",
1160 __func__, strerror(-err));
1161 abort();
1162 }
1163 start_addr += slot_size;
1164 size -= slot_size;
1165 } while (size);
1166 goto out;
1167 }
1168
1169 /* register the new slot */
1170 do {
1171 slot_size = MIN(kvm_max_slot_size, size);
1172 mem = kvm_alloc_slot(kml);
1173 mem->memory_size = slot_size;
1174 mem->start_addr = start_addr;
1175 mem->ram = ram;
1176 mem->flags = kvm_mem_flags(mr);
1177
1178 if (mem->flags & KVM_MEM_LOG_DIRTY_PAGES) {
1179 /*
1180 * Reallocate the bmap; it means it doesn't disappear in
1181 * middle of a migrate.
1182 */
1183 kvm_memslot_init_dirty_bitmap(mem);
1184 }
1185 err = kvm_set_user_memory_region(kml, mem, true);
1186 if (err) {
1187 fprintf(stderr, "%s: error registering slot: %s\n", __func__,
1188 strerror(-err));
1189 abort();
1190 }
1191 start_addr += slot_size;
1192 ram += slot_size;
1193 size -= slot_size;
1194 } while (size);
1195
1196 out:
1197 kvm_slots_unlock(kml);
1198 }
1199
1200 static void kvm_region_add(MemoryListener *listener,
1201 MemoryRegionSection *section)
1202 {
1203 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
1204
1205 memory_region_ref(section->mr);
1206 kvm_set_phys_mem(kml, section, true);
1207 }
1208
1209 static void kvm_region_del(MemoryListener *listener,
1210 MemoryRegionSection *section)
1211 {
1212 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
1213
1214 kvm_set_phys_mem(kml, section, false);
1215 memory_region_unref(section->mr);
1216 }
1217
1218 static void kvm_log_sync(MemoryListener *listener,
1219 MemoryRegionSection *section)
1220 {
1221 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
1222 int r;
1223
1224 kvm_slots_lock(kml);
1225 r = kvm_physical_sync_dirty_bitmap(kml, section);
1226 kvm_slots_unlock(kml);
1227 if (r < 0) {
1228 abort();
1229 }
1230 }
1231
1232 static void kvm_log_clear(MemoryListener *listener,
1233 MemoryRegionSection *section)
1234 {
1235 KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
1236 int r;
1237
1238 r = kvm_physical_log_clear(kml, section);
1239 if (r < 0) {
1240 error_report_once("%s: kvm log clear failed: mr=%s "
1241 "offset=%"HWADDR_PRIx" size=%"PRIx64, __func__,
1242 section->mr->name, section->offset_within_region,
1243 int128_get64(section->size));
1244 abort();
1245 }
1246 }
1247
1248 static void kvm_mem_ioeventfd_add(MemoryListener *listener,
1249 MemoryRegionSection *section,
1250 bool match_data, uint64_t data,
1251 EventNotifier *e)
1252 {
1253 int fd = event_notifier_get_fd(e);
1254 int r;
1255
1256 r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
1257 data, true, int128_get64(section->size),
1258 match_data);
1259 if (r < 0) {
1260 fprintf(stderr, "%s: error adding ioeventfd: %s (%d)\n",
1261 __func__, strerror(-r), -r);
1262 abort();
1263 }
1264 }
1265
1266 static void kvm_mem_ioeventfd_del(MemoryListener *listener,
1267 MemoryRegionSection *section,
1268 bool match_data, uint64_t data,
1269 EventNotifier *e)
1270 {
1271 int fd = event_notifier_get_fd(e);
1272 int r;
1273
1274 r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
1275 data, false, int128_get64(section->size),
1276 match_data);
1277 if (r < 0) {
1278 fprintf(stderr, "%s: error deleting ioeventfd: %s (%d)\n",
1279 __func__, strerror(-r), -r);
1280 abort();
1281 }
1282 }
1283
1284 static void kvm_io_ioeventfd_add(MemoryListener *listener,
1285 MemoryRegionSection *section,
1286 bool match_data, uint64_t data,
1287 EventNotifier *e)
1288 {
1289 int fd = event_notifier_get_fd(e);
1290 int r;
1291
1292 r = kvm_set_ioeventfd_pio(fd, section->offset_within_address_space,
1293 data, true, int128_get64(section->size),
1294 match_data);
1295 if (r < 0) {
1296 fprintf(stderr, "%s: error adding ioeventfd: %s (%d)\n",
1297 __func__, strerror(-r), -r);
1298 abort();
1299 }
1300 }
1301
1302 static void kvm_io_ioeventfd_del(MemoryListener *listener,
1303 MemoryRegionSection *section,
1304 bool match_data, uint64_t data,
1305 EventNotifier *e)
1306
1307 {
1308 int fd = event_notifier_get_fd(e);
1309 int r;
1310
1311 r = kvm_set_ioeventfd_pio(fd, section->offset_within_address_space,
1312 data, false, int128_get64(section->size),
1313 match_data);
1314 if (r < 0) {
1315 fprintf(stderr, "%s: error deleting ioeventfd: %s (%d)\n",
1316 __func__, strerror(-r), -r);
1317 abort();
1318 }
1319 }
1320
1321 void kvm_memory_listener_register(KVMState *s, KVMMemoryListener *kml,
1322 AddressSpace *as, int as_id)
1323 {
1324 int i;
1325
1326 qemu_mutex_init(&kml->slots_lock);
1327 kml->slots = g_malloc0(s->nr_slots * sizeof(KVMSlot));
1328 kml->as_id = as_id;
1329
1330 for (i = 0; i < s->nr_slots; i++) {
1331 kml->slots[i].slot = i;
1332 }
1333
1334 kml->listener.region_add = kvm_region_add;
1335 kml->listener.region_del = kvm_region_del;
1336 kml->listener.log_start = kvm_log_start;
1337 kml->listener.log_stop = kvm_log_stop;
1338 kml->listener.log_sync = kvm_log_sync;
1339 kml->listener.log_clear = kvm_log_clear;
1340 kml->listener.priority = 10;
1341
1342 memory_listener_register(&kml->listener, as);
1343
1344 for (i = 0; i < s->nr_as; ++i) {
1345 if (!s->as[i].as) {
1346 s->as[i].as = as;
1347 s->as[i].ml = kml;
1348 break;
1349 }
1350 }
1351 }
1352
1353 static MemoryListener kvm_io_listener = {
1354 .eventfd_add = kvm_io_ioeventfd_add,
1355 .eventfd_del = kvm_io_ioeventfd_del,
1356 .priority = 10,
1357 };
1358
1359 int kvm_set_irq(KVMState *s, int irq, int level)
1360 {
1361 struct kvm_irq_level event;
1362 int ret;
1363
1364 assert(kvm_async_interrupts_enabled());
1365
1366 event.level = level;
1367 event.irq = irq;
1368 ret = kvm_vm_ioctl(s, s->irq_set_ioctl, &event);
1369 if (ret < 0) {
1370 perror("kvm_set_irq");
1371 abort();
1372 }
1373
1374 return (s->irq_set_ioctl == KVM_IRQ_LINE) ? 1 : event.status;
1375 }
1376
1377 #ifdef KVM_CAP_IRQ_ROUTING
1378 typedef struct KVMMSIRoute {
1379 struct kvm_irq_routing_entry kroute;
1380 QTAILQ_ENTRY(KVMMSIRoute) entry;
1381 } KVMMSIRoute;
1382
1383 static void set_gsi(KVMState *s, unsigned int gsi)
1384 {
1385 set_bit(gsi, s->used_gsi_bitmap);
1386 }
1387
1388 static void clear_gsi(KVMState *s, unsigned int gsi)
1389 {
1390 clear_bit(gsi, s->used_gsi_bitmap);
1391 }
1392
1393 void kvm_init_irq_routing(KVMState *s)
1394 {
1395 int gsi_count, i;
1396
1397 gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING) - 1;
1398 if (gsi_count > 0) {
1399 /* Round up so we can search ints using ffs */
1400 s->used_gsi_bitmap = bitmap_new(gsi_count);
1401 s->gsi_count = gsi_count;
1402 }
1403
1404 s->irq_routes = g_malloc0(sizeof(*s->irq_routes));
1405 s->nr_allocated_irq_routes = 0;
1406
1407 if (!kvm_direct_msi_allowed) {
1408 for (i = 0; i < KVM_MSI_HASHTAB_SIZE; i++) {
1409 QTAILQ_INIT(&s->msi_hashtab[i]);
1410 }
1411 }
1412
1413 kvm_arch_init_irq_routing(s);
1414 }
1415
1416 void kvm_irqchip_commit_routes(KVMState *s)
1417 {
1418 int ret;
1419
1420 if (kvm_gsi_direct_mapping()) {
1421 return;
1422 }
1423
1424 if (!kvm_gsi_routing_enabled()) {
1425 return;
1426 }
1427
1428 s->irq_routes->flags = 0;
1429 trace_kvm_irqchip_commit_routes();
1430 ret = kvm_vm_ioctl(s, KVM_SET_GSI_ROUTING, s->irq_routes);
1431 assert(ret == 0);
1432 }
1433
1434 static void kvm_add_routing_entry(KVMState *s,
1435 struct kvm_irq_routing_entry *entry)
1436 {
1437 struct kvm_irq_routing_entry *new;
1438 int n, size;
1439
1440 if (s->irq_routes->nr == s->nr_allocated_irq_routes) {
1441 n = s->nr_allocated_irq_routes * 2;
1442 if (n < 64) {
1443 n = 64;
1444 }
1445 size = sizeof(struct kvm_irq_routing);
1446 size += n * sizeof(*new);
1447 s->irq_routes = g_realloc(s->irq_routes, size);
1448 s->nr_allocated_irq_routes = n;
1449 }
1450 n = s->irq_routes->nr++;
1451 new = &s->irq_routes->entries[n];
1452
1453 *new = *entry;
1454
1455 set_gsi(s, entry->gsi);
1456 }
1457
1458 static int kvm_update_routing_entry(KVMState *s,
1459 struct kvm_irq_routing_entry *new_entry)
1460 {
1461 struct kvm_irq_routing_entry *entry;
1462 int n;
1463
1464 for (n = 0; n < s->irq_routes->nr; n++) {
1465 entry = &s->irq_routes->entries[n];
1466 if (entry->gsi != new_entry->gsi) {
1467 continue;
1468 }
1469
1470 if(!memcmp(entry, new_entry, sizeof *entry)) {
1471 return 0;
1472 }
1473
1474 *entry = *new_entry;
1475
1476 return 0;
1477 }
1478
1479 return -ESRCH;
1480 }
1481
1482 void kvm_irqchip_add_irq_route(KVMState *s, int irq, int irqchip, int pin)
1483 {
1484 struct kvm_irq_routing_entry e = {};
1485
1486 assert(pin < s->gsi_count);
1487
1488 e.gsi = irq;
1489 e.type = KVM_IRQ_ROUTING_IRQCHIP;
1490 e.flags = 0;
1491 e.u.irqchip.irqchip = irqchip;
1492 e.u.irqchip.pin = pin;
1493 kvm_add_routing_entry(s, &e);
1494 }
1495
1496 void kvm_irqchip_release_virq(KVMState *s, int virq)
1497 {
1498 struct kvm_irq_routing_entry *e;
1499 int i;
1500
1501 if (kvm_gsi_direct_mapping()) {
1502 return;
1503 }
1504
1505 for (i = 0; i < s->irq_routes->nr; i++) {
1506 e = &s->irq_routes->entries[i];
1507 if (e->gsi == virq) {
1508 s->irq_routes->nr--;
1509 *e = s->irq_routes->entries[s->irq_routes->nr];
1510 }
1511 }
1512 clear_gsi(s, virq);
1513 kvm_arch_release_virq_post(virq);
1514 trace_kvm_irqchip_release_virq(virq);
1515 }
1516
1517 void kvm_irqchip_add_change_notifier(Notifier *n)
1518 {
1519 notifier_list_add(&kvm_irqchip_change_notifiers, n);
1520 }
1521
1522 void kvm_irqchip_remove_change_notifier(Notifier *n)
1523 {
1524 notifier_remove(n);
1525 }
1526
1527 void kvm_irqchip_change_notify(void)
1528 {
1529 notifier_list_notify(&kvm_irqchip_change_notifiers, NULL);
1530 }
1531
1532 static unsigned int kvm_hash_msi(uint32_t data)
1533 {
1534 /* This is optimized for IA32 MSI layout. However, no other arch shall
1535 * repeat the mistake of not providing a direct MSI injection API. */
1536 return data & 0xff;
1537 }
1538
1539 static void kvm_flush_dynamic_msi_routes(KVMState *s)
1540 {
1541 KVMMSIRoute *route, *next;
1542 unsigned int hash;
1543
1544 for (hash = 0; hash < KVM_MSI_HASHTAB_SIZE; hash++) {
1545 QTAILQ_FOREACH_SAFE(route, &s->msi_hashtab[hash], entry, next) {
1546 kvm_irqchip_release_virq(s, route->kroute.gsi);
1547 QTAILQ_REMOVE(&s->msi_hashtab[hash], route, entry);
1548 g_free(route);
1549 }
1550 }
1551 }
1552
1553 static int kvm_irqchip_get_virq(KVMState *s)
1554 {
1555 int next_virq;
1556
1557 /*
1558 * PIC and IOAPIC share the first 16 GSI numbers, thus the available
1559 * GSI numbers are more than the number of IRQ route. Allocating a GSI
1560 * number can succeed even though a new route entry cannot be added.
1561 * When this happens, flush dynamic MSI entries to free IRQ route entries.
1562 */
1563 if (!kvm_direct_msi_allowed && s->irq_routes->nr == s->gsi_count) {
1564 kvm_flush_dynamic_msi_routes(s);
1565 }
1566
1567 /* Return the lowest unused GSI in the bitmap */
1568 next_virq = find_first_zero_bit(s->used_gsi_bitmap, s->gsi_count);
1569 if (next_virq >= s->gsi_count) {
1570 return -ENOSPC;
1571 } else {
1572 return next_virq;
1573 }
1574 }
1575
1576 static KVMMSIRoute *kvm_lookup_msi_route(KVMState *s, MSIMessage msg)
1577 {
1578 unsigned int hash = kvm_hash_msi(msg.data);
1579 KVMMSIRoute *route;
1580
1581 QTAILQ_FOREACH(route, &s->msi_hashtab[hash], entry) {
1582 if (route->kroute.u.msi.address_lo == (uint32_t)msg.address &&
1583 route->kroute.u.msi.address_hi == (msg.address >> 32) &&
1584 route->kroute.u.msi.data == le32_to_cpu(msg.data)) {
1585 return route;
1586 }
1587 }
1588 return NULL;
1589 }
1590
1591 int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
1592 {
1593 struct kvm_msi msi;
1594 KVMMSIRoute *route;
1595
1596 if (kvm_direct_msi_allowed) {
1597 msi.address_lo = (uint32_t)msg.address;
1598 msi.address_hi = msg.address >> 32;
1599 msi.data = le32_to_cpu(msg.data);
1600 msi.flags = 0;
1601 memset(msi.pad, 0, sizeof(msi.pad));
1602
1603 return kvm_vm_ioctl(s, KVM_SIGNAL_MSI, &msi);
1604 }
1605
1606 route = kvm_lookup_msi_route(s, msg);
1607 if (!route) {
1608 int virq;
1609
1610 virq = kvm_irqchip_get_virq(s);
1611 if (virq < 0) {
1612 return virq;
1613 }
1614
1615 route = g_malloc0(sizeof(KVMMSIRoute));
1616 route->kroute.gsi = virq;
1617 route->kroute.type = KVM_IRQ_ROUTING_MSI;
1618 route->kroute.flags = 0;
1619 route->kroute.u.msi.address_lo = (uint32_t)msg.address;
1620 route->kroute.u.msi.address_hi = msg.address >> 32;
1621 route->kroute.u.msi.data = le32_to_cpu(msg.data);
1622
1623 kvm_add_routing_entry(s, &route->kroute);
1624 kvm_irqchip_commit_routes(s);
1625
1626 QTAILQ_INSERT_TAIL(&s->msi_hashtab[kvm_hash_msi(msg.data)], route,
1627 entry);
1628 }
1629
1630 assert(route->kroute.type == KVM_IRQ_ROUTING_MSI);
1631
1632 return kvm_set_irq(s, route->kroute.gsi, 1);
1633 }
1634
1635 int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
1636 {
1637 struct kvm_irq_routing_entry kroute = {};
1638 int virq;
1639 MSIMessage msg = {0, 0};
1640
1641 if (pci_available && dev) {
1642 msg = pci_get_msi_message(dev, vector);
1643 }
1644
1645 if (kvm_gsi_direct_mapping()) {
1646 return kvm_arch_msi_data_to_gsi(msg.data);
1647 }
1648
1649 if (!kvm_gsi_routing_enabled()) {
1650 return -ENOSYS;
1651 }
1652
1653 virq = kvm_irqchip_get_virq(s);
1654 if (virq < 0) {
1655 return virq;
1656 }
1657
1658 kroute.gsi = virq;
1659 kroute.type = KVM_IRQ_ROUTING_MSI;
1660 kroute.flags = 0;
1661 kroute.u.msi.address_lo = (uint32_t)msg.address;
1662 kroute.u.msi.address_hi = msg.address >> 32;
1663 kroute.u.msi.data = le32_to_cpu(msg.data);
1664 if (pci_available && kvm_msi_devid_required()) {
1665 kroute.flags = KVM_MSI_VALID_DEVID;
1666 kroute.u.msi.devid = pci_requester_id(dev);
1667 }
1668 if (kvm_arch_fixup_msi_route(&kroute, msg.address, msg.data, dev)) {
1669 kvm_irqchip_release_virq(s, virq);
1670 return -EINVAL;
1671 }
1672
1673 trace_kvm_irqchip_add_msi_route(dev ? dev->name : (char *)"N/A",
1674 vector, virq);
1675
1676 kvm_add_routing_entry(s, &kroute);
1677 kvm_arch_add_msi_route_post(&kroute, vector, dev);
1678 kvm_irqchip_commit_routes(s);
1679
1680 return virq;
1681 }
1682
1683 int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg,
1684 PCIDevice *dev)
1685 {
1686 struct kvm_irq_routing_entry kroute = {};
1687
1688 if (kvm_gsi_direct_mapping()) {
1689 return 0;
1690 }
1691
1692 if (!kvm_irqchip_in_kernel()) {
1693 return -ENOSYS;
1694 }
1695
1696 kroute.gsi = virq;
1697 kroute.type = KVM_IRQ_ROUTING_MSI;
1698 kroute.flags = 0;
1699 kroute.u.msi.address_lo = (uint32_t)msg.address;
1700 kroute.u.msi.address_hi = msg.address >> 32;
1701 kroute.u.msi.data = le32_to_cpu(msg.data);
1702 if (pci_available && kvm_msi_devid_required()) {
1703 kroute.flags = KVM_MSI_VALID_DEVID;
1704 kroute.u.msi.devid = pci_requester_id(dev);
1705 }
1706 if (kvm_arch_fixup_msi_route(&kroute, msg.address, msg.data, dev)) {
1707 return -EINVAL;
1708 }
1709
1710 trace_kvm_irqchip_update_msi_route(virq);
1711
1712 return kvm_update_routing_entry(s, &kroute);
1713 }
1714
1715 static int kvm_irqchip_assign_irqfd(KVMState *s, EventNotifier *event,
1716 EventNotifier *resample, int virq,
1717 bool assign)
1718 {
1719 int fd = event_notifier_get_fd(event);
1720 int rfd = resample ? event_notifier_get_fd(resample) : -1;
1721
1722 struct kvm_irqfd irqfd = {
1723 .fd = fd,
1724 .gsi = virq,
1725 .flags = assign ? 0 : KVM_IRQFD_FLAG_DEASSIGN,
1726 };
1727
1728 if (rfd != -1) {
1729 assert(assign);
1730 if (kvm_irqchip_is_split()) {
1731 /*
1732 * When the slow irqchip (e.g. IOAPIC) is in the
1733 * userspace, KVM kernel resamplefd will not work because
1734 * the EOI of the interrupt will be delivered to userspace
1735 * instead, so the KVM kernel resamplefd kick will be
1736 * skipped. The userspace here mimics what the kernel
1737 * provides with resamplefd, remember the resamplefd and
1738 * kick it when we receive EOI of this IRQ.
1739 *
1740 * This is hackery because IOAPIC is mostly bypassed
1741 * (except EOI broadcasts) when irqfd is used. However
1742 * this can bring much performance back for split irqchip
1743 * with INTx IRQs (for VFIO, this gives 93% perf of the
1744 * full fast path, which is 46% perf boost comparing to
1745 * the INTx slow path).
1746 */
1747 kvm_resample_fd_insert(virq, resample);
1748 } else {
1749 irqfd.flags |= KVM_IRQFD_FLAG_RESAMPLE;
1750 irqfd.resamplefd = rfd;
1751 }
1752 } else if (!assign) {
1753 if (kvm_irqchip_is_split()) {
1754 kvm_resample_fd_remove(virq);
1755 }
1756 }
1757
1758 if (!kvm_irqfds_enabled()) {
1759 return -ENOSYS;
1760 }
1761
1762 return kvm_vm_ioctl(s, KVM_IRQFD, &irqfd);
1763 }
1764
1765 int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter)
1766 {
1767 struct kvm_irq_routing_entry kroute = {};
1768 int virq;
1769
1770 if (!kvm_gsi_routing_enabled()) {
1771 return -ENOSYS;
1772 }
1773
1774 virq = kvm_irqchip_get_virq(s);
1775 if (virq < 0) {
1776 return virq;
1777 }
1778
1779 kroute.gsi = virq;
1780 kroute.type = KVM_IRQ_ROUTING_S390_ADAPTER;
1781 kroute.flags = 0;
1782 kroute.u.adapter.summary_addr = adapter->summary_addr;
1783 kroute.u.adapter.ind_addr = adapter->ind_addr;
1784 kroute.u.adapter.summary_offset = adapter->summary_offset;
1785 kroute.u.adapter.ind_offset = adapter->ind_offset;
1786 kroute.u.adapter.adapter_id = adapter->adapter_id;
1787
1788 kvm_add_routing_entry(s, &kroute);
1789
1790 return virq;
1791 }
1792
1793 int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint)
1794 {
1795 struct kvm_irq_routing_entry kroute = {};
1796 int virq;
1797
1798 if (!kvm_gsi_routing_enabled()) {
1799 return -ENOSYS;
1800 }
1801 if (!kvm_check_extension(s, KVM_CAP_HYPERV_SYNIC)) {
1802 return -ENOSYS;
1803 }
1804 virq = kvm_irqchip_get_virq(s);
1805 if (virq < 0) {
1806 return virq;
1807 }
1808
1809 kroute.gsi = virq;
1810 kroute.type = KVM_IRQ_ROUTING_HV_SINT;
1811 kroute.flags = 0;
1812 kroute.u.hv_sint.vcpu = vcpu;
1813 kroute.u.hv_sint.sint = sint;
1814
1815 kvm_add_routing_entry(s, &kroute);
1816 kvm_irqchip_commit_routes(s);
1817
1818 return virq;
1819 }
1820
1821 #else /* !KVM_CAP_IRQ_ROUTING */
1822
1823 void kvm_init_irq_routing(KVMState *s)
1824 {
1825 }
1826
1827 void kvm_irqchip_release_virq(KVMState *s, int virq)
1828 {
1829 }
1830
1831 int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
1832 {
1833 abort();
1834 }
1835
1836 int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
1837 {
1838 return -ENOSYS;
1839 }
1840
1841 int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter)
1842 {
1843 return -ENOSYS;
1844 }
1845
1846 int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint)
1847 {
1848 return -ENOSYS;
1849 }
1850
1851 static int kvm_irqchip_assign_irqfd(KVMState *s, EventNotifier *event,
1852 EventNotifier *resample, int virq,
1853 bool assign)
1854 {
1855 abort();
1856 }
1857
1858 int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg)
1859 {
1860 return -ENOSYS;
1861 }
1862 #endif /* !KVM_CAP_IRQ_ROUTING */
1863
1864 int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
1865 EventNotifier *rn, int virq)
1866 {
1867 return kvm_irqchip_assign_irqfd(s, n, rn, virq, true);
1868 }
1869
1870 int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
1871 int virq)
1872 {
1873 return kvm_irqchip_assign_irqfd(s, n, NULL, virq, false);
1874 }
1875
1876 int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n,
1877 EventNotifier *rn, qemu_irq irq)
1878 {
1879 gpointer key, gsi;
1880 gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
1881
1882 if (!found) {
1883 return -ENXIO;
1884 }
1885 return kvm_irqchip_add_irqfd_notifier_gsi(s, n, rn, GPOINTER_TO_INT(gsi));
1886 }
1887
1888 int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n,
1889 qemu_irq irq)
1890 {
1891 gpointer key, gsi;
1892 gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
1893
1894 if (!found) {
1895 return -ENXIO;
1896 }
1897 return kvm_irqchip_remove_irqfd_notifier_gsi(s, n, GPOINTER_TO_INT(gsi));
1898 }
1899
1900 void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi)
1901 {
1902 g_hash_table_insert(s->gsimap, irq, GINT_TO_POINTER(gsi));
1903 }
1904
1905 static void kvm_irqchip_create(KVMState *s)
1906 {
1907 int ret;
1908
1909 assert(s->kernel_irqchip_split != ON_OFF_AUTO_AUTO);
1910 if (kvm_check_extension(s, KVM_CAP_IRQCHIP)) {
1911 ;
1912 } else if (kvm_check_extension(s, KVM_CAP_S390_IRQCHIP)) {
1913 ret = kvm_vm_enable_cap(s, KVM_CAP_S390_IRQCHIP, 0);
1914 if (ret < 0) {
1915 fprintf(stderr, "Enable kernel irqchip failed: %s\n", strerror(-ret));
1916 exit(1);
1917 }
1918 } else {
1919 return;
1920 }
1921
1922 /* First probe and see if there's a arch-specific hook to create the
1923 * in-kernel irqchip for us */
1924 ret = kvm_arch_irqchip_create(s);
1925 if (ret == 0) {
1926 if (s->kernel_irqchip_split == ON_OFF_AUTO_ON) {
1927 perror("Split IRQ chip mode not supported.");
1928 exit(1);
1929 } else {
1930 ret = kvm_vm_ioctl(s, KVM_CREATE_IRQCHIP);
1931 }
1932 }
1933 if (ret < 0) {
1934 fprintf(stderr, "Create kernel irqchip failed: %s\n", strerror(-ret));
1935 exit(1);
1936 }
1937
1938 kvm_kernel_irqchip = true;
1939 /* If we have an in-kernel IRQ chip then we must have asynchronous
1940 * interrupt delivery (though the reverse is not necessarily true)
1941 */
1942 kvm_async_interrupts_allowed = true;
1943 kvm_halt_in_kernel_allowed = true;
1944
1945 kvm_init_irq_routing(s);
1946
1947 s->gsimap = g_hash_table_new(g_direct_hash, g_direct_equal);
1948 }
1949
1950 /* Find number of supported CPUs using the recommended
1951 * procedure from the kernel API documentation to cope with
1952 * older kernels that may be missing capabilities.
1953 */
1954 static int kvm_recommended_vcpus(KVMState *s)
1955 {
1956 int ret = kvm_vm_check_extension(s, KVM_CAP_NR_VCPUS);
1957 return (ret) ? ret : 4;
1958 }
1959
1960 static int kvm_max_vcpus(KVMState *s)
1961 {
1962 int ret = kvm_check_extension(s, KVM_CAP_MAX_VCPUS);
1963 return (ret) ? ret : kvm_recommended_vcpus(s);
1964 }
1965
1966 static int kvm_max_vcpu_id(KVMState *s)
1967 {
1968 int ret = kvm_check_extension(s, KVM_CAP_MAX_VCPU_ID);
1969 return (ret) ? ret : kvm_max_vcpus(s);
1970 }
1971
1972 bool kvm_vcpu_id_is_valid(int vcpu_id)
1973 {
1974 KVMState *s = KVM_STATE(current_accel());
1975 return vcpu_id >= 0 && vcpu_id < kvm_max_vcpu_id(s);
1976 }
1977
1978 static int kvm_init(MachineState *ms)
1979 {
1980 MachineClass *mc = MACHINE_GET_CLASS(ms);
1981 static const char upgrade_note[] =
1982 "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
1983 "(see http://sourceforge.net/projects/kvm).\n";
1984 struct {
1985 const char *name;
1986 int num;
1987 } num_cpus[] = {
1988 { "SMP", ms->smp.cpus },
1989 { "hotpluggable", ms->smp.max_cpus },
1990 { NULL, }
1991 }, *nc = num_cpus;
1992 int soft_vcpus_limit, hard_vcpus_limit;
1993 KVMState *s;
1994 const KVMCapabilityInfo *missing_cap;
1995 int ret;
1996 int type = 0;
1997 const char *kvm_type;
1998
1999 s = KVM_STATE(ms->accelerator);
2000
2001 /*
2002 * On systems where the kernel can support different base page
2003 * sizes, host page size may be different from TARGET_PAGE_SIZE,
2004 * even with KVM. TARGET_PAGE_SIZE is assumed to be the minimum
2005 * page size for the system though.
2006 */
2007 assert(TARGET_PAGE_SIZE <= qemu_real_host_page_size);
2008
2009 s->sigmask_len = 8;
2010
2011 #ifdef KVM_CAP_SET_GUEST_DEBUG
2012 QTAILQ_INIT(&s->kvm_sw_breakpoints);
2013 #endif
2014 QLIST_INIT(&s->kvm_parked_vcpus);
2015 s->vmfd = -1;
2016 s->fd = qemu_open("/dev/kvm", O_RDWR);
2017 if (s->fd == -1) {
2018 fprintf(stderr, "Could not access KVM kernel module: %m\n");
2019 ret = -errno;
2020 goto err;
2021 }
2022
2023 ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
2024 if (ret < KVM_API_VERSION) {
2025 if (ret >= 0) {
2026 ret = -EINVAL;
2027 }
2028 fprintf(stderr, "kvm version too old\n");
2029 goto err;
2030 }
2031
2032 if (ret > KVM_API_VERSION) {
2033 ret = -EINVAL;
2034 fprintf(stderr, "kvm version not supported\n");
2035 goto err;
2036 }
2037
2038 kvm_immediate_exit = kvm_check_extension(s, KVM_CAP_IMMEDIATE_EXIT);
2039 s->nr_slots = kvm_check_extension(s, KVM_CAP_NR_MEMSLOTS);
2040
2041 /* If unspecified, use the default value */
2042 if (!s->nr_slots) {
2043 s->nr_slots = 32;
2044 }
2045
2046 s->nr_as = kvm_check_extension(s, KVM_CAP_MULTI_ADDRESS_SPACE);
2047 if (s->nr_as <= 1) {
2048 s->nr_as = 1;
2049 }
2050 s->as = g_new0(struct KVMAs, s->nr_as);
2051
2052 kvm_type = qemu_opt_get(qemu_get_machine_opts(), "kvm-type");
2053 if (mc->kvm_type) {
2054 type = mc->kvm_type(ms, kvm_type);
2055 } else if (kvm_type) {
2056 ret = -EINVAL;
2057 fprintf(stderr, "Invalid argument kvm-type=%s\n", kvm_type);
2058 goto err;
2059 }
2060
2061 do {
2062 ret = kvm_ioctl(s, KVM_CREATE_VM, type);
2063 } while (ret == -EINTR);
2064
2065 if (ret < 0) {
2066 fprintf(stderr, "ioctl(KVM_CREATE_VM) failed: %d %s\n", -ret,
2067 strerror(-ret));
2068
2069 #ifdef TARGET_S390X
2070 if (ret == -EINVAL) {
2071 fprintf(stderr,
2072 "Host kernel setup problem detected. Please verify:\n");
2073 fprintf(stderr, "- for kernels supporting the switch_amode or"
2074 " user_mode parameters, whether\n");
2075 fprintf(stderr,
2076 " user space is running in primary address space\n");
2077 fprintf(stderr,
2078 "- for kernels supporting the vm.allocate_pgste sysctl, "
2079 "whether it is enabled\n");
2080 }
2081 #endif
2082 goto err;
2083 }
2084
2085 s->vmfd = ret;
2086
2087 /* check the vcpu limits */
2088 soft_vcpus_limit = kvm_recommended_vcpus(s);
2089 hard_vcpus_limit = kvm_max_vcpus(s);
2090
2091 while (nc->name) {
2092 if (nc->num > soft_vcpus_limit) {
2093 warn_report("Number of %s cpus requested (%d) exceeds "
2094 "the recommended cpus supported by KVM (%d)",
2095 nc->name, nc->num, soft_vcpus_limit);
2096
2097 if (nc->num > hard_vcpus_limit) {
2098 fprintf(stderr, "Number of %s cpus requested (%d) exceeds "
2099 "the maximum cpus supported by KVM (%d)\n",
2100 nc->name, nc->num, hard_vcpus_limit);
2101 exit(1);
2102 }
2103 }
2104 nc++;
2105 }
2106
2107 missing_cap = kvm_check_extension_list(s, kvm_required_capabilites);
2108 if (!missing_cap) {
2109 missing_cap =
2110 kvm_check_extension_list(s, kvm_arch_required_capabilities);
2111 }
2112 if (missing_cap) {
2113 ret = -EINVAL;
2114 fprintf(stderr, "kvm does not support %s\n%s",
2115 missing_cap->name, upgrade_note);
2116 goto err;
2117 }
2118
2119 s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);
2120 s->coalesced_pio = s->coalesced_mmio &&
2121 kvm_check_extension(s, KVM_CAP_COALESCED_PIO);
2122
2123 s->manual_dirty_log_protect =
2124 kvm_check_extension(s, KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2);
2125 if (s->manual_dirty_log_protect) {
2126 ret = kvm_vm_enable_cap(s, KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2, 0, 1);
2127 if (ret) {
2128 warn_report("Trying to enable KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 "
2129 "but failed. Falling back to the legacy mode. ");
2130 s->manual_dirty_log_protect = false;
2131 }
2132 }
2133
2134 #ifdef KVM_CAP_VCPU_EVENTS
2135 s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS);
2136 #endif
2137
2138 s->robust_singlestep =
2139 kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP);
2140
2141 #ifdef KVM_CAP_DEBUGREGS
2142 s->debugregs = kvm_check_extension(s, KVM_CAP_DEBUGREGS);
2143 #endif
2144
2145 s->max_nested_state_len = kvm_check_extension(s, KVM_CAP_NESTED_STATE);
2146
2147 #ifdef KVM_CAP_IRQ_ROUTING
2148 kvm_direct_msi_allowed = (kvm_check_extension(s, KVM_CAP_SIGNAL_MSI) > 0);
2149 #endif
2150
2151 s->intx_set_mask = kvm_check_extension(s, KVM_CAP_PCI_2_3);
2152
2153 s->irq_set_ioctl = KVM_IRQ_LINE;
2154 if (kvm_check_extension(s, KVM_CAP_IRQ_INJECT_STATUS)) {
2155 s->irq_set_ioctl = KVM_IRQ_LINE_STATUS;
2156 }
2157
2158 kvm_readonly_mem_allowed =
2159 (kvm_check_extension(s, KVM_CAP_READONLY_MEM) > 0);
2160
2161 kvm_eventfds_allowed =
2162 (kvm_check_extension(s, KVM_CAP_IOEVENTFD) > 0);
2163
2164 kvm_irqfds_allowed =
2165 (kvm_check_extension(s, KVM_CAP_IRQFD) > 0);
2166
2167 kvm_resamplefds_allowed =
2168 (kvm_check_extension(s, KVM_CAP_IRQFD_RESAMPLE) > 0);
2169
2170 kvm_vm_attributes_allowed =
2171 (kvm_check_extension(s, KVM_CAP_VM_ATTRIBUTES) > 0);
2172
2173 kvm_ioeventfd_any_length_allowed =
2174 (kvm_check_extension(s, KVM_CAP_IOEVENTFD_ANY_LENGTH) > 0);
2175
2176 kvm_state = s;
2177
2178 /*
2179 * if memory encryption object is specified then initialize the memory
2180 * encryption context.
2181 */
2182 if (ms->memory_encryption) {
2183 kvm_state->memcrypt_handle = sev_guest_init(ms->memory_encryption);
2184 if (!kvm_state->memcrypt_handle) {
2185 ret = -1;
2186 goto err;
2187 }
2188
2189 kvm_state->memcrypt_encrypt_data = sev_encrypt_data;
2190 }
2191
2192 ret = kvm_arch_init(ms, s);
2193 if (ret < 0) {
2194 goto err;
2195 }
2196
2197 if (s->kernel_irqchip_split == ON_OFF_AUTO_AUTO) {
2198 s->kernel_irqchip_split = mc->default_kernel_irqchip_split ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF;
2199 }
2200
2201 qemu_register_reset(kvm_unpoison_all, NULL);
2202
2203 if (s->kernel_irqchip_allowed) {
2204 kvm_irqchip_create(s);
2205 }
2206
2207 if (kvm_eventfds_allowed) {
2208 s->memory_listener.listener.eventfd_add = kvm_mem_ioeventfd_add;
2209 s->memory_listener.listener.eventfd_del = kvm_mem_ioeventfd_del;
2210 }
2211 s->memory_listener.listener.coalesced_io_add = kvm_coalesce_mmio_region;
2212 s->memory_listener.listener.coalesced_io_del = kvm_uncoalesce_mmio_region;
2213
2214 kvm_memory_listener_register(s, &s->memory_listener,
2215 &address_space_memory, 0);
2216 memory_listener_register(&kvm_io_listener,
2217 &address_space_io);
2218 memory_listener_register(&kvm_coalesced_pio_listener,
2219 &address_space_io);
2220
2221 s->many_ioeventfds = kvm_check_many_ioeventfds();
2222
2223 s->sync_mmu = !!kvm_vm_check_extension(kvm_state, KVM_CAP_SYNC_MMU);
2224 if (!s->sync_mmu) {
2225 qemu_balloon_inhibit(true);
2226 }
2227
2228 return 0;
2229
2230 err:
2231 assert(ret < 0);
2232 if (s->vmfd >= 0) {
2233 close(s->vmfd);
2234 }
2235 if (s->fd != -1) {
2236 close(s->fd);
2237 }
2238 g_free(s->memory_listener.slots);
2239
2240 return ret;
2241 }
2242
2243 void kvm_set_sigmask_len(KVMState *s, unsigned int sigmask_len)
2244 {
2245 s->sigmask_len = sigmask_len;
2246 }
2247
2248 static void kvm_handle_io(uint16_t port, MemTxAttrs attrs, void *data, int direction,
2249 int size, uint32_t count)
2250 {
2251 int i;
2252 uint8_t *ptr = data;
2253
2254 for (i = 0; i < count; i++) {
2255 address_space_rw(&address_space_io, port, attrs,
2256 ptr, size,
2257 direction == KVM_EXIT_IO_OUT);
2258 ptr += size;
2259 }
2260 }
2261
2262 static int kvm_handle_internal_error(CPUState *cpu, struct kvm_run *run)
2263 {
2264 fprintf(stderr, "KVM internal error. Suberror: %d\n",
2265 run->internal.suberror);
2266
2267 if (kvm_check_extension(kvm_state, KVM_CAP_INTERNAL_ERROR_DATA)) {
2268 int i;
2269
2270 for (i = 0; i < run->internal.ndata; ++i) {
2271 fprintf(stderr, "extra data[%d]: %"PRIx64"\n",
2272 i, (uint64_t)run->internal.data[i]);
2273 }
2274 }
2275 if (run->internal.suberror == KVM_INTERNAL_ERROR_EMULATION) {
2276 fprintf(stderr, "emulation failure\n");
2277 if (!kvm_arch_stop_on_emulation_error(cpu)) {
2278 cpu_dump_state(cpu, stderr, CPU_DUMP_CODE);
2279 return EXCP_INTERRUPT;
2280 }
2281 }
2282 /* FIXME: Should trigger a qmp message to let management know
2283 * something went wrong.
2284 */
2285 return -1;
2286 }
2287
2288 void kvm_flush_coalesced_mmio_buffer(void)
2289 {
2290 KVMState *s = kvm_state;
2291
2292 if (s->coalesced_flush_in_progress) {
2293 return;
2294 }
2295
2296 s->coalesced_flush_in_progress = true;
2297
2298 if (s->coalesced_mmio_ring) {
2299 struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;
2300 while (ring->first != ring->last) {
2301 struct kvm_coalesced_mmio *ent;
2302
2303 ent = &ring->coalesced_mmio[ring->first];
2304
2305 if (ent->pio == 1) {
2306 address_space_write(&address_space_io, ent->phys_addr,
2307 MEMTXATTRS_UNSPECIFIED, ent->data,
2308 ent->len);
2309 } else {
2310 cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
2311 }
2312 smp_wmb();
2313 ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
2314 }
2315 }
2316
2317 s->coalesced_flush_in_progress = false;
2318 }
2319
2320 static void do_kvm_cpu_synchronize_state(CPUState *cpu, run_on_cpu_data arg)
2321 {
2322 if (!cpu->vcpu_dirty) {
2323 kvm_arch_get_registers(cpu);
2324 cpu->vcpu_dirty = true;
2325 }
2326 }
2327
2328 void kvm_cpu_synchronize_state(CPUState *cpu)
2329 {
2330 if (!cpu->vcpu_dirty) {
2331 run_on_cpu(cpu, do_kvm_cpu_synchronize_state, RUN_ON_CPU_NULL);
2332 }
2333 }
2334
2335 static void do_kvm_cpu_synchronize_post_reset(CPUState *cpu, run_on_cpu_data arg)
2336 {
2337 kvm_arch_put_registers(cpu, KVM_PUT_RESET_STATE);
2338 cpu->vcpu_dirty = false;
2339 }
2340
2341 void kvm_cpu_synchronize_post_reset(CPUState *cpu)
2342 {
2343 run_on_cpu(cpu, do_kvm_cpu_synchronize_post_reset, RUN_ON_CPU_NULL);
2344 }
2345
2346 static void do_kvm_cpu_synchronize_post_init(CPUState *cpu, run_on_cpu_data arg)
2347 {
2348 kvm_arch_put_registers(cpu, KVM_PUT_FULL_STATE);
2349 cpu->vcpu_dirty = false;
2350 }
2351
2352 void kvm_cpu_synchronize_post_init(CPUState *cpu)
2353 {
2354 run_on_cpu(cpu, do_kvm_cpu_synchronize_post_init, RUN_ON_CPU_NULL);
2355 }
2356
2357 static void do_kvm_cpu_synchronize_pre_loadvm(CPUState *cpu, run_on_cpu_data arg)
2358 {
2359 cpu->vcpu_dirty = true;
2360 }
2361
2362 void kvm_cpu_synchronize_pre_loadvm(CPUState *cpu)
2363 {
2364 run_on_cpu(cpu, do_kvm_cpu_synchronize_pre_loadvm, RUN_ON_CPU_NULL);
2365 }
2366
2367 #ifdef KVM_HAVE_MCE_INJECTION
2368 static __thread void *pending_sigbus_addr;
2369 static __thread int pending_sigbus_code;
2370 static __thread bool have_sigbus_pending;
2371 #endif
2372
2373 static void kvm_cpu_kick(CPUState *cpu)
2374 {
2375 atomic_set(&cpu->kvm_run->immediate_exit, 1);
2376 }
2377
2378 static void kvm_cpu_kick_self(void)
2379 {
2380 if (kvm_immediate_exit) {
2381 kvm_cpu_kick(current_cpu);
2382 } else {
2383 qemu_cpu_kick_self();
2384 }
2385 }
2386
2387 static void kvm_eat_signals(CPUState *cpu)
2388 {
2389 struct timespec ts = { 0, 0 };
2390 siginfo_t siginfo;
2391 sigset_t waitset;
2392 sigset_t chkset;
2393 int r;
2394
2395 if (kvm_immediate_exit) {
2396 atomic_set(&cpu->kvm_run->immediate_exit, 0);
2397 /* Write kvm_run->immediate_exit before the cpu->exit_request
2398 * write in kvm_cpu_exec.
2399 */
2400 smp_wmb();
2401 return;
2402 }
2403
2404 sigemptyset(&waitset);
2405 sigaddset(&waitset, SIG_IPI);
2406
2407 do {
2408 r = sigtimedwait(&waitset, &siginfo, &ts);
2409 if (r == -1 && !(errno == EAGAIN || errno == EINTR)) {
2410 perror("sigtimedwait");
2411 exit(1);
2412 }
2413
2414 r = sigpending(&chkset);
2415 if (r == -1) {
2416 perror("sigpending");
2417 exit(1);
2418 }
2419 } while (sigismember(&chkset, SIG_IPI));
2420 }
2421
2422 int kvm_cpu_exec(CPUState *cpu)
2423 {
2424 struct kvm_run *run = cpu->kvm_run;
2425 int ret, run_ret;
2426
2427 DPRINTF("kvm_cpu_exec()\n");
2428
2429 if (kvm_arch_process_async_events(cpu)) {
2430 atomic_set(&cpu->exit_request, 0);
2431 return EXCP_HLT;
2432 }
2433
2434 qemu_mutex_unlock_iothread();
2435 cpu_exec_start(cpu);
2436
2437 do {
2438 MemTxAttrs attrs;
2439
2440 if (cpu->vcpu_dirty) {
2441 kvm_arch_put_registers(cpu, KVM_PUT_RUNTIME_STATE);
2442 cpu->vcpu_dirty = false;
2443 }
2444
2445 kvm_arch_pre_run(cpu, run);
2446 if (atomic_read(&cpu->exit_request)) {
2447 DPRINTF("interrupt exit requested\n");
2448 /*
2449 * KVM requires us to reenter the kernel after IO exits to complete
2450 * instruction emulation. This self-signal will ensure that we
2451 * leave ASAP again.
2452 */
2453 kvm_cpu_kick_self();
2454 }
2455
2456 /* Read cpu->exit_request before KVM_RUN reads run->immediate_exit.
2457 * Matching barrier in kvm_eat_signals.
2458 */
2459 smp_rmb();
2460
2461 run_ret = kvm_vcpu_ioctl(cpu, KVM_RUN, 0);
2462
2463 attrs = kvm_arch_post_run(cpu, run);
2464
2465 #ifdef KVM_HAVE_MCE_INJECTION
2466 if (unlikely(have_sigbus_pending)) {
2467 qemu_mutex_lock_iothread();
2468 kvm_arch_on_sigbus_vcpu(cpu, pending_sigbus_code,
2469 pending_sigbus_addr);
2470 have_sigbus_pending = false;
2471 qemu_mutex_unlock_iothread();
2472 }
2473 #endif
2474
2475 if (run_ret < 0) {
2476 if (run_ret == -EINTR || run_ret == -EAGAIN) {
2477 DPRINTF("io window exit\n");
2478 kvm_eat_signals(cpu);
2479 ret = EXCP_INTERRUPT;
2480 break;
2481 }
2482 fprintf(stderr, "error: kvm run failed %s\n",
2483 strerror(-run_ret));
2484 #ifdef TARGET_PPC
2485 if (run_ret == -EBUSY) {
2486 fprintf(stderr,
2487 "This is probably because your SMT is enabled.\n"
2488 "VCPU can only run on primary threads with all "
2489 "secondary threads offline.\n");
2490 }
2491 #endif
2492 ret = -1;
2493 break;
2494 }
2495
2496 trace_kvm_run_exit(cpu->cpu_index, run->exit_reason);
2497 switch (run->exit_reason) {
2498 case KVM_EXIT_IO:
2499 DPRINTF("handle_io\n");
2500 /* Called outside BQL */
2501 kvm_handle_io(run->io.port, attrs,
2502 (uint8_t *)run + run->io.data_offset,
2503 run->io.direction,
2504 run->io.size,
2505 run->io.count);
2506 ret = 0;
2507 break;
2508 case KVM_EXIT_MMIO:
2509 DPRINTF("handle_mmio\n");
2510 /* Called outside BQL */
2511 address_space_rw(&address_space_memory,
2512 run->mmio.phys_addr, attrs,
2513 run->mmio.data,
2514 run->mmio.len,
2515 run->mmio.is_write);
2516 ret = 0;
2517 break;
2518 case KVM_EXIT_IRQ_WINDOW_OPEN:
2519 DPRINTF("irq_window_open\n");
2520 ret = EXCP_INTERRUPT;
2521 break;
2522 case KVM_EXIT_SHUTDOWN:
2523 DPRINTF("shutdown\n");
2524 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
2525 ret = EXCP_INTERRUPT;
2526 break;
2527 case KVM_EXIT_UNKNOWN:
2528 fprintf(stderr, "KVM: unknown exit, hardware reason %" PRIx64 "\n",
2529 (uint64_t)run->hw.hardware_exit_reason);
2530 ret = -1;
2531 break;
2532 case KVM_EXIT_INTERNAL_ERROR:
2533 ret = kvm_handle_internal_error(cpu, run);
2534 break;
2535 case KVM_EXIT_SYSTEM_EVENT:
2536 switch (run->system_event.type) {
2537 case KVM_SYSTEM_EVENT_SHUTDOWN:
2538 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
2539 ret = EXCP_INTERRUPT;
2540 break;
2541 case KVM_SYSTEM_EVENT_RESET:
2542 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
2543 ret = EXCP_INTERRUPT;
2544 break;
2545 case KVM_SYSTEM_EVENT_CRASH:
2546 kvm_cpu_synchronize_state(cpu);
2547 qemu_mutex_lock_iothread();
2548 qemu_system_guest_panicked(cpu_get_crash_info(cpu));
2549 qemu_mutex_unlock_iothread();
2550 ret = 0;
2551 break;
2552 default:
2553 DPRINTF("kvm_arch_handle_exit\n");
2554 ret = kvm_arch_handle_exit(cpu, run);
2555 break;
2556 }
2557 break;
2558 default:
2559 DPRINTF("kvm_arch_handle_exit\n");
2560 ret = kvm_arch_handle_exit(cpu, run);
2561 break;
2562 }
2563 } while (ret == 0);
2564
2565 cpu_exec_end(cpu);
2566 qemu_mutex_lock_iothread();
2567
2568 if (ret < 0) {
2569 cpu_dump_state(cpu, stderr, CPU_DUMP_CODE);
2570 vm_stop(RUN_STATE_INTERNAL_ERROR);
2571 }
2572
2573 atomic_set(&cpu->exit_request, 0);
2574 return ret;
2575 }
2576
2577 int kvm_ioctl(KVMState *s, int type, ...)
2578 {
2579 int ret;
2580 void *arg;
2581 va_list ap;
2582
2583 va_start(ap, type);
2584 arg = va_arg(ap, void *);
2585 va_end(ap);
2586
2587 trace_kvm_ioctl(type, arg);
2588 ret = ioctl(s->fd, type, arg);
2589 if (ret == -1) {
2590 ret = -errno;
2591 }
2592 return ret;
2593 }
2594
2595 int kvm_vm_ioctl(KVMState *s, int type, ...)
2596 {
2597 int ret;
2598 void *arg;
2599 va_list ap;
2600
2601 va_start(ap, type);
2602 arg = va_arg(ap, void *);
2603 va_end(ap);
2604
2605 trace_kvm_vm_ioctl(type, arg);
2606 ret = ioctl(s->vmfd, type, arg);
2607 if (ret == -1) {
2608 ret = -errno;
2609 }
2610 return ret;
2611 }
2612
2613 int kvm_vcpu_ioctl(CPUState *cpu, int type, ...)
2614 {
2615 int ret;
2616 void *arg;
2617 va_list ap;
2618
2619 va_start(ap, type);
2620 arg = va_arg(ap, void *);
2621 va_end(ap);
2622
2623 trace_kvm_vcpu_ioctl(cpu->cpu_index, type, arg);
2624 ret = ioctl(cpu->kvm_fd, type, arg);
2625 if (ret == -1) {
2626 ret = -errno;
2627 }
2628 return ret;
2629 }
2630
2631 int kvm_device_ioctl(int fd, int type, ...)
2632 {
2633 int ret;
2634 void *arg;
2635 va_list ap;
2636
2637 va_start(ap, type);
2638 arg = va_arg(ap, void *);
2639 va_end(ap);
2640
2641 trace_kvm_device_ioctl(fd, type, arg);
2642 ret = ioctl(fd, type, arg);
2643 if (ret == -1) {
2644 ret = -errno;
2645 }
2646 return ret;
2647 }
2648
2649 int kvm_vm_check_attr(KVMState *s, uint32_t group, uint64_t attr)
2650 {
2651 int ret;
2652 struct kvm_device_attr attribute = {
2653 .group = group,
2654 .attr = attr,
2655 };
2656
2657 if (!kvm_vm_attributes_allowed) {
2658 return 0;
2659 }
2660
2661 ret = kvm_vm_ioctl(s, KVM_HAS_DEVICE_ATTR, &attribute);
2662 /* kvm returns 0 on success for HAS_DEVICE_ATTR */
2663 return ret ? 0 : 1;
2664 }
2665
2666 int kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr)
2667 {
2668 struct kvm_device_attr attribute = {
2669 .group = group,
2670 .attr = attr,
2671 .flags = 0,
2672 };
2673
2674 return kvm_device_ioctl(dev_fd, KVM_HAS_DEVICE_ATTR, &attribute) ? 0 : 1;
2675 }
2676
2677 int kvm_device_access(int fd, int group, uint64_t attr,
2678 void *val, bool write, Error **errp)
2679 {
2680 struct kvm_device_attr kvmattr;
2681 int err;
2682
2683 kvmattr.flags = 0;
2684 kvmattr.group = group;
2685 kvmattr.attr = attr;
2686 kvmattr.addr = (uintptr_t)val;
2687
2688 err = kvm_device_ioctl(fd,
2689 write ? KVM_SET_DEVICE_ATTR : KVM_GET_DEVICE_ATTR,
2690 &kvmattr);
2691 if (err < 0) {
2692 error_setg_errno(errp, -err,
2693 "KVM_%s_DEVICE_ATTR failed: Group %d "
2694 "attr 0x%016" PRIx64,
2695 write ? "SET" : "GET", group, attr);
2696 }
2697 return err;
2698 }
2699
2700 bool kvm_has_sync_mmu(void)
2701 {
2702 return kvm_state->sync_mmu;
2703 }
2704
2705 int kvm_has_vcpu_events(void)
2706 {
2707 return kvm_state->vcpu_events;
2708 }
2709
2710 int kvm_has_robust_singlestep(void)
2711 {
2712 return kvm_state->robust_singlestep;
2713 }
2714
2715 int kvm_has_debugregs(void)
2716 {
2717 return kvm_state->debugregs;
2718 }
2719
2720 int kvm_max_nested_state_length(void)
2721 {
2722 return kvm_state->max_nested_state_len;
2723 }
2724
2725 int kvm_has_many_ioeventfds(void)
2726 {
2727 if (!kvm_enabled()) {
2728 return 0;
2729 }
2730 return kvm_state->many_ioeventfds;
2731 }
2732
2733 int kvm_has_gsi_routing(void)
2734 {
2735 #ifdef KVM_CAP_IRQ_ROUTING
2736 return kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING);
2737 #else
2738 return false;
2739 #endif
2740 }
2741
2742 int kvm_has_intx_set_mask(void)
2743 {
2744 return kvm_state->intx_set_mask;
2745 }
2746
2747 bool kvm_arm_supports_user_irq(void)
2748 {
2749 return kvm_check_extension(kvm_state, KVM_CAP_ARM_USER_IRQ);
2750 }
2751
2752 #ifdef KVM_CAP_SET_GUEST_DEBUG
2753 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *cpu,
2754 target_ulong pc)
2755 {
2756 struct kvm_sw_breakpoint *bp;
2757
2758 QTAILQ_FOREACH(bp, &cpu->kvm_state->kvm_sw_breakpoints, entry) {
2759 if (bp->pc == pc) {
2760 return bp;
2761 }
2762 }
2763 return NULL;
2764 }
2765
2766 int kvm_sw_breakpoints_active(CPUState *cpu)
2767 {
2768 return !QTAILQ_EMPTY(&cpu->kvm_state->kvm_sw_breakpoints);
2769 }
2770
2771 struct kvm_set_guest_debug_data {
2772 struct kvm_guest_debug dbg;
2773 int err;
2774 };
2775
2776 static void kvm_invoke_set_guest_debug(CPUState *cpu, run_on_cpu_data data)
2777 {
2778 struct kvm_set_guest_debug_data *dbg_data =
2779 (struct kvm_set_guest_debug_data *) data.host_ptr;
2780
2781 dbg_data->err = kvm_vcpu_ioctl(cpu, KVM_SET_GUEST_DEBUG,
2782 &dbg_data->dbg);
2783 }
2784
2785 int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap)
2786 {
2787 struct kvm_set_guest_debug_data data;
2788
2789 data.dbg.control = reinject_trap;
2790
2791 if (cpu->singlestep_enabled) {
2792 data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
2793 }
2794 kvm_arch_update_guest_debug(cpu, &data.dbg);
2795
2796 run_on_cpu(cpu, kvm_invoke_set_guest_debug,
2797 RUN_ON_CPU_HOST_PTR(&data));
2798 return data.err;
2799 }
2800
2801 int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,
2802 target_ulong len, int type)
2803 {
2804 struct kvm_sw_breakpoint *bp;
2805 int err;
2806
2807 if (type == GDB_BREAKPOINT_SW) {
2808 bp = kvm_find_sw_breakpoint(cpu, addr);
2809 if (bp) {
2810 bp->use_count++;
2811 return 0;
2812 }
2813
2814 bp = g_malloc(sizeof(struct kvm_sw_breakpoint));
2815 bp->pc = addr;
2816 bp->use_count = 1;
2817 err = kvm_arch_insert_sw_breakpoint(cpu, bp);
2818 if (err) {
2819 g_free(bp);
2820 return err;
2821 }
2822
2823 QTAILQ_INSERT_HEAD(&cpu->kvm_state->kvm_sw_breakpoints, bp, entry);
2824 } else {
2825 err = kvm_arch_insert_hw_breakpoint(addr, len, type);
2826 if (err) {
2827 return err;
2828 }
2829 }
2830
2831 CPU_FOREACH(cpu) {
2832 err = kvm_update_guest_debug(cpu, 0);
2833 if (err) {
2834 return err;
2835 }
2836 }
2837 return 0;
2838 }
2839
2840 int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr,
2841 target_ulong len, int type)
2842 {
2843 struct kvm_sw_breakpoint *bp;
2844 int err;
2845
2846 if (type == GDB_BREAKPOINT_SW) {
2847 bp = kvm_find_sw_breakpoint(cpu, addr);
2848 if (!bp) {
2849 return -ENOENT;
2850 }
2851
2852 if (bp->use_count > 1) {
2853 bp->use_count--;
2854 return 0;
2855 }
2856
2857 err = kvm_arch_remove_sw_breakpoint(cpu, bp);
2858 if (err) {
2859 return err;
2860 }
2861
2862 QTAILQ_REMOVE(&cpu->kvm_state->kvm_sw_breakpoints, bp, entry);
2863 g_free(bp);
2864 } else {
2865 err = kvm_arch_remove_hw_breakpoint(addr, len, type);
2866 if (err) {
2867 return err;
2868 }
2869 }
2870
2871 CPU_FOREACH(cpu) {
2872 err = kvm_update_guest_debug(cpu, 0);
2873 if (err) {
2874 return err;
2875 }
2876 }
2877 return 0;
2878 }
2879
2880 void kvm_remove_all_breakpoints(CPUState *cpu)
2881 {
2882 struct kvm_sw_breakpoint *bp, *next;
2883 KVMState *s = cpu->kvm_state;
2884 CPUState *tmpcpu;
2885
2886 QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) {
2887 if (kvm_arch_remove_sw_breakpoint(cpu, bp) != 0) {
2888 /* Try harder to find a CPU that currently sees the breakpoint. */
2889 CPU_FOREACH(tmpcpu) {
2890 if (kvm_arch_remove_sw_breakpoint(tmpcpu, bp) == 0) {
2891 break;
2892 }
2893 }
2894 }
2895 QTAILQ_REMOVE(&s->kvm_sw_breakpoints, bp, entry);
2896 g_free(bp);
2897 }
2898 kvm_arch_remove_all_hw_breakpoints();
2899
2900 CPU_FOREACH(cpu) {
2901 kvm_update_guest_debug(cpu, 0);
2902 }
2903 }
2904
2905 #else /* !KVM_CAP_SET_GUEST_DEBUG */
2906
2907 int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap)
2908 {
2909 return -EINVAL;
2910 }
2911
2912 int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,
2913 target_ulong len, int type)
2914 {
2915 return -EINVAL;
2916 }
2917
2918 int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr,
2919 target_ulong len, int type)
2920 {
2921 return -EINVAL;
2922 }
2923
2924 void kvm_remove_all_breakpoints(CPUState *cpu)
2925 {
2926 }
2927 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
2928
2929 static int kvm_set_signal_mask(CPUState *cpu, const sigset_t *sigset)
2930 {
2931 KVMState *s = kvm_state;
2932 struct kvm_signal_mask *sigmask;
2933 int r;
2934
2935 sigmask = g_malloc(sizeof(*sigmask) + sizeof(*sigset));
2936
2937 sigmask->len = s->sigmask_len;
2938 memcpy(sigmask->sigset, sigset, sizeof(*sigset));
2939 r = kvm_vcpu_ioctl(cpu, KVM_SET_SIGNAL_MASK, sigmask);
2940 g_free(sigmask);
2941
2942 return r;
2943 }
2944
2945 static void kvm_ipi_signal(int sig)
2946 {
2947 if (current_cpu) {
2948 assert(kvm_immediate_exit);
2949 kvm_cpu_kick(current_cpu);
2950 }
2951 }
2952
2953 void kvm_init_cpu_signals(CPUState *cpu)
2954 {
2955 int r;
2956 sigset_t set;
2957 struct sigaction sigact;
2958
2959 memset(&sigact, 0, sizeof(sigact));
2960 sigact.sa_handler = kvm_ipi_signal;
2961 sigaction(SIG_IPI, &sigact, NULL);
2962
2963 pthread_sigmask(SIG_BLOCK, NULL, &set);
2964 #if defined KVM_HAVE_MCE_INJECTION
2965 sigdelset(&set, SIGBUS);
2966 pthread_sigmask(SIG_SETMASK, &set, NULL);
2967 #endif
2968 sigdelset(&set, SIG_IPI);
2969 if (kvm_immediate_exit) {
2970 r = pthread_sigmask(SIG_SETMASK, &set, NULL);
2971 } else {
2972 r = kvm_set_signal_mask(cpu, &set);
2973 }
2974 if (r) {
2975 fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
2976 exit(1);
2977 }
2978 }
2979
2980 /* Called asynchronously in VCPU thread. */
2981 int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
2982 {
2983 #ifdef KVM_HAVE_MCE_INJECTION
2984 if (have_sigbus_pending) {
2985 return 1;
2986 }
2987 have_sigbus_pending = true;
2988 pending_sigbus_addr = addr;
2989 pending_sigbus_code = code;
2990 atomic_set(&cpu->exit_request, 1);
2991 return 0;
2992 #else
2993 return 1;
2994 #endif
2995 }
2996
2997 /* Called synchronously (via signalfd) in main thread. */
2998 int kvm_on_sigbus(int code, void *addr)
2999 {
3000 #ifdef KVM_HAVE_MCE_INJECTION
3001 /* Action required MCE kills the process if SIGBUS is blocked. Because
3002 * that's what happens in the I/O thread, where we handle MCE via signalfd,
3003 * we can only get action optional here.
3004 */
3005 assert(code != BUS_MCEERR_AR);
3006 kvm_arch_on_sigbus_vcpu(first_cpu, code, addr);
3007 return 0;
3008 #else
3009 return 1;
3010 #endif
3011 }
3012
3013 int kvm_create_device(KVMState *s, uint64_t type, bool test)
3014 {
3015 int ret;
3016 struct kvm_create_device create_dev;
3017
3018 create_dev.type = type;
3019 create_dev.fd = -1;
3020 create_dev.flags = test ? KVM_CREATE_DEVICE_TEST : 0;
3021
3022 if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) {
3023 return -ENOTSUP;
3024 }
3025
3026 ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &create_dev);
3027 if (ret) {
3028 return ret;
3029 }
3030
3031 return test ? 0 : create_dev.fd;
3032 }
3033
3034 bool kvm_device_supported(int vmfd, uint64_t type)
3035 {
3036 struct kvm_create_device create_dev = {
3037 .type = type,
3038 .fd = -1,
3039 .flags = KVM_CREATE_DEVICE_TEST,
3040 };
3041
3042 if (ioctl(vmfd, KVM_CHECK_EXTENSION, KVM_CAP_DEVICE_CTRL) <= 0) {
3043 return false;
3044 }
3045
3046 return (ioctl(vmfd, KVM_CREATE_DEVICE, &create_dev) >= 0);
3047 }
3048
3049 int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source)
3050 {
3051 struct kvm_one_reg reg;
3052 int r;
3053
3054 reg.id = id;
3055 reg.addr = (uintptr_t) source;
3056 r = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
3057 if (r) {
3058 trace_kvm_failed_reg_set(id, strerror(-r));
3059 }
3060 return r;
3061 }
3062
3063 int kvm_get_one_reg(CPUState *cs, uint64_t id, void *target)
3064 {
3065 struct kvm_one_reg reg;
3066 int r;
3067
3068 reg.id = id;
3069 reg.addr = (uintptr_t) target;
3070 r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
3071 if (r) {
3072 trace_kvm_failed_reg_get(id, strerror(-r));
3073 }
3074 return r;
3075 }
3076
3077 static bool kvm_accel_has_memory(MachineState *ms, AddressSpace *as,
3078 hwaddr start_addr, hwaddr size)
3079 {
3080 KVMState *kvm = KVM_STATE(ms->accelerator);
3081 int i;
3082
3083 for (i = 0; i < kvm->nr_as; ++i) {
3084 if (kvm->as[i].as == as && kvm->as[i].ml) {
3085 size = MIN(kvm_max_slot_size, size);
3086 return NULL != kvm_lookup_matching_slot(kvm->as[i].ml,
3087 start_addr, size);
3088 }
3089 }
3090
3091 return false;
3092 }
3093
3094 static void kvm_get_kvm_shadow_mem(Object *obj, Visitor *v,
3095 const char *name, void *opaque,
3096 Error **errp)
3097 {
3098 KVMState *s = KVM_STATE(obj);
3099 int64_t value = s->kvm_shadow_mem;
3100
3101 visit_type_int(v, name, &value, errp);
3102 }
3103
3104 static void kvm_set_kvm_shadow_mem(Object *obj, Visitor *v,
3105 const char *name, void *opaque,
3106 Error **errp)
3107 {
3108 KVMState *s = KVM_STATE(obj);
3109 Error *error = NULL;
3110 int64_t value;
3111
3112 visit_type_int(v, name, &value, &error);
3113 if (error) {
3114 error_propagate(errp, error);
3115 return;
3116 }
3117
3118 s->kvm_shadow_mem = value;
3119 }
3120
3121 static void kvm_set_kernel_irqchip(Object *obj, Visitor *v,
3122 const char *name, void *opaque,
3123 Error **errp)
3124 {
3125 Error *err = NULL;
3126 KVMState *s = KVM_STATE(obj);
3127 OnOffSplit mode;
3128
3129 visit_type_OnOffSplit(v, name, &mode, &err);
3130 if (err) {
3131 error_propagate(errp, err);
3132 return;
3133 } else {
3134 switch (mode) {
3135 case ON_OFF_SPLIT_ON:
3136 s->kernel_irqchip_allowed = true;
3137 s->kernel_irqchip_required = true;
3138 s->kernel_irqchip_split = ON_OFF_AUTO_OFF;
3139 break;
3140 case ON_OFF_SPLIT_OFF:
3141 s->kernel_irqchip_allowed = false;
3142 s->kernel_irqchip_required = false;
3143 s->kernel_irqchip_split = ON_OFF_AUTO_OFF;
3144 break;
3145 case ON_OFF_SPLIT_SPLIT:
3146 s->kernel_irqchip_allowed = true;
3147 s->kernel_irqchip_required = true;
3148 s->kernel_irqchip_split = ON_OFF_AUTO_ON;
3149 break;
3150 default:
3151 /* The value was checked in visit_type_OnOffSplit() above. If
3152 * we get here, then something is wrong in QEMU.
3153 */
3154 abort();
3155 }
3156 }
3157 }
3158
3159 bool kvm_kernel_irqchip_allowed(void)
3160 {
3161 return kvm_state->kernel_irqchip_allowed;
3162 }
3163
3164 bool kvm_kernel_irqchip_required(void)
3165 {
3166 return kvm_state->kernel_irqchip_required;
3167 }
3168
3169 bool kvm_kernel_irqchip_split(void)
3170 {
3171 return kvm_state->kernel_irqchip_split == ON_OFF_AUTO_ON;
3172 }
3173
3174 static void kvm_accel_instance_init(Object *obj)
3175 {
3176 KVMState *s = KVM_STATE(obj);
3177
3178 s->kvm_shadow_mem = -1;
3179 s->kernel_irqchip_allowed = true;
3180 s->kernel_irqchip_split = ON_OFF_AUTO_AUTO;
3181 }
3182
3183 static void kvm_accel_class_init(ObjectClass *oc, void *data)
3184 {
3185 AccelClass *ac = ACCEL_CLASS(oc);
3186 ac->name = "KVM";
3187 ac->init_machine = kvm_init;
3188 ac->has_memory = kvm_accel_has_memory;
3189 ac->allowed = &kvm_allowed;
3190
3191 object_class_property_add(oc, "kernel-irqchip", "on|off|split",
3192 NULL, kvm_set_kernel_irqchip,
3193 NULL, NULL);
3194 object_class_property_set_description(oc, "kernel-irqchip",
3195 "Configure KVM in-kernel irqchip");
3196
3197 object_class_property_add(oc, "kvm-shadow-mem", "int",
3198 kvm_get_kvm_shadow_mem, kvm_set_kvm_shadow_mem,
3199 NULL, NULL);
3200 object_class_property_set_description(oc, "kvm-shadow-mem",
3201 "KVM shadow MMU size");
3202 }
3203
3204 static const TypeInfo kvm_accel_type = {
3205 .name = TYPE_KVM_ACCEL,
3206 .parent = TYPE_ACCEL,
3207 .instance_init = kvm_accel_instance_init,
3208 .class_init = kvm_accel_class_init,
3209 .instance_size = sizeof(KVMState),
3210 };
3211
3212 static void kvm_type_init(void)
3213 {
3214 type_register_static(&kvm_accel_type);
3215 }
3216
3217 type_init(kvm_type_init);
armbru's QEMU hackery