4 * Copyright IBM, Corp. 2008
8 * Anthony Liguori <aliguori@us.ibm.com>
9 * Glauber Costa <gcosta@redhat.com>
11 * This work is licensed under the terms of the GNU GPL, version 2 or later.
12 * See the COPYING file in the top-level directory.
16 #include <sys/types.h>
17 #include <sys/ioctl.h>
21 #include <linux/kvm.h>
23 #include "qemu-common.h"
28 /* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */
29 #define PAGE_SIZE TARGET_PAGE_SIZE
34 #define dprintf(fmt, ...) \
35 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
37 #define dprintf(fmt, ...) \
41 typedef struct KVMSlot
43 target_phys_addr_t start_addr;
44 ram_addr_t memory_size;
45 ram_addr_t phys_offset;
50 typedef struct kvm_dirty_log KVMDirtyLog;
60 #ifdef KVM_CAP_SET_GUEST_DEBUG
61 struct kvm_sw_breakpoint_head kvm_sw_breakpoints;
65 static KVMState *kvm_state;
67 static KVMSlot *kvm_alloc_slot(KVMState *s)
71 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
72 /* KVM private memory slots */
75 if (s->slots[i].memory_size == 0)
79 fprintf(stderr, "%s: no free slot available\n", __func__);
83 static KVMSlot *kvm_lookup_matching_slot(KVMState *s,
84 target_phys_addr_t start_addr,
85 target_phys_addr_t end_addr)
89 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
90 KVMSlot *mem = &s->slots[i];
92 if (start_addr == mem->start_addr &&
93 end_addr == mem->start_addr + mem->memory_size) {
101 static KVMSlot *kvm_lookup_slot(KVMState *s, target_phys_addr_t start_addr)
105 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
106 KVMSlot *mem = &s->slots[i];
108 if (start_addr >= mem->start_addr &&
109 start_addr < (mem->start_addr + mem->memory_size))
116 static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot)
118 struct kvm_userspace_memory_region mem;
120 mem.slot = slot->slot;
121 mem.guest_phys_addr = slot->start_addr;
122 mem.memory_size = slot->memory_size;
123 mem.userspace_addr = (unsigned long)qemu_get_ram_ptr(slot->phys_offset);
124 mem.flags = slot->flags;
126 return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
130 int kvm_init_vcpu(CPUState *env)
132 KVMState *s = kvm_state;
136 dprintf("kvm_init_vcpu\n");
138 ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index);
140 dprintf("kvm_create_vcpu failed\n");
147 mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
149 dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n");
153 env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
155 if (env->kvm_run == MAP_FAILED) {
157 dprintf("mmap'ing vcpu state failed\n");
161 ret = kvm_arch_init_vcpu(env);
167 int kvm_sync_vcpus(void)
171 for (env = first_cpu; env != NULL; env = env->next_cpu) {
174 ret = kvm_arch_put_registers(env);
183 * dirty pages logging control
185 static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr,
186 ram_addr_t size, unsigned flags,
189 KVMState *s = kvm_state;
190 KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size);
192 fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-"
193 TARGET_FMT_plx "\n", __func__, phys_addr,
194 phys_addr + size - 1);
198 flags = (mem->flags & ~mask) | flags;
199 /* Nothing changed, no need to issue ioctl */
200 if (flags == mem->flags)
205 return kvm_set_user_memory_region(s, mem);
208 int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size)
210 return kvm_dirty_pages_log_change(phys_addr, size,
211 KVM_MEM_LOG_DIRTY_PAGES,
212 KVM_MEM_LOG_DIRTY_PAGES);
215 int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size)
217 return kvm_dirty_pages_log_change(phys_addr, size,
219 KVM_MEM_LOG_DIRTY_PAGES);
223 * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
224 * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty().
225 * This means all bits are set to dirty.
227 * @start_add: start of logged region.
228 * @end_addr: end of logged region.
230 void kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr,
231 target_phys_addr_t end_addr)
233 KVMState *s = kvm_state;
235 KVMSlot *mem = kvm_lookup_matching_slot(s, start_addr, end_addr);
236 unsigned long alloc_size;
238 target_phys_addr_t phys_addr = start_addr;
240 dprintf("sync addr: " TARGET_FMT_lx " into %lx\n", start_addr,
243 fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-"
244 TARGET_FMT_plx "\n", __func__, phys_addr, end_addr - 1);
248 alloc_size = mem->memory_size >> TARGET_PAGE_BITS / sizeof(d.dirty_bitmap);
249 d.dirty_bitmap = qemu_mallocz(alloc_size);
252 dprintf("slot %d, phys_addr %llx, uaddr: %llx\n",
253 d.slot, mem->start_addr, mem->phys_offset);
255 if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
256 dprintf("ioctl failed %d\n", errno);
260 phys_addr = start_addr;
261 for (addr = mem->phys_offset; phys_addr < end_addr; phys_addr+= TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) {
262 unsigned long *bitmap = (unsigned long *)d.dirty_bitmap;
263 unsigned nr = (phys_addr - start_addr) >> TARGET_PAGE_BITS;
264 unsigned word = nr / (sizeof(*bitmap) * 8);
265 unsigned bit = nr % (sizeof(*bitmap) * 8);
266 if ((bitmap[word] >> bit) & 1)
267 cpu_physical_memory_set_dirty(addr);
270 qemu_free(d.dirty_bitmap);
273 int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
276 #ifdef KVM_CAP_COALESCED_MMIO
277 KVMState *s = kvm_state;
279 if (s->coalesced_mmio) {
280 struct kvm_coalesced_mmio_zone zone;
285 ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
292 int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
295 #ifdef KVM_CAP_COALESCED_MMIO
296 KVMState *s = kvm_state;
298 if (s->coalesced_mmio) {
299 struct kvm_coalesced_mmio_zone zone;
304 ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
311 int kvm_init(int smp_cpus)
320 s = qemu_mallocz(sizeof(KVMState));
322 #ifdef KVM_CAP_SET_GUEST_DEBUG
323 TAILQ_INIT(&s->kvm_sw_breakpoints);
325 for (i = 0; i < ARRAY_SIZE(s->slots); i++)
326 s->slots[i].slot = i;
329 s->fd = open("/dev/kvm", O_RDWR);
331 fprintf(stderr, "Could not access KVM kernel module: %m\n");
336 ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
337 if (ret < KVM_API_VERSION) {
340 fprintf(stderr, "kvm version too old\n");
344 if (ret > KVM_API_VERSION) {
346 fprintf(stderr, "kvm version not supported\n");
350 s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
354 /* initially, KVM allocated its own memory and we had to jump through
355 * hooks to make phys_ram_base point to this. Modern versions of KVM
356 * just use a user allocated buffer so we can use regular pages
357 * unmodified. Make sure we have a sufficiently modern version of KVM.
359 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY);
363 fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n");
367 /* There was a nasty bug in < kvm-80 that prevents memory slots from being
368 * destroyed properly. Since we rely on this capability, refuse to work
369 * with any kernel without this capability. */
370 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION,
371 KVM_CAP_DESTROY_MEMORY_REGION_WORKS);
377 "KVM kernel module broken (DESTROY_MEMORY_REGION)\n"
378 "Please upgrade to at least kvm-81.\n");
382 s->coalesced_mmio = 0;
383 #ifdef KVM_CAP_COALESCED_MMIO
384 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_COALESCED_MMIO);
386 s->coalesced_mmio = ret;
389 ret = kvm_arch_init(s, smp_cpus);
409 static int kvm_handle_io(CPUState *env, uint16_t port, void *data,
410 int direction, int size, uint32_t count)
415 for (i = 0; i < count; i++) {
416 if (direction == KVM_EXIT_IO_IN) {
419 stb_p(ptr, cpu_inb(env, port));
422 stw_p(ptr, cpu_inw(env, port));
425 stl_p(ptr, cpu_inl(env, port));
431 cpu_outb(env, port, ldub_p(ptr));
434 cpu_outw(env, port, lduw_p(ptr));
437 cpu_outl(env, port, ldl_p(ptr));
448 static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run)
450 #ifdef KVM_CAP_COALESCED_MMIO
451 KVMState *s = kvm_state;
452 if (s->coalesced_mmio) {
453 struct kvm_coalesced_mmio_ring *ring;
455 ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE);
456 while (ring->first != ring->last) {
457 struct kvm_coalesced_mmio *ent;
459 ent = &ring->coalesced_mmio[ring->first];
461 cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
462 /* FIXME smp_wmb() */
463 ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
469 int kvm_cpu_exec(CPUState *env)
471 struct kvm_run *run = env->kvm_run;
474 dprintf("kvm_cpu_exec()\n");
477 kvm_arch_pre_run(env, run);
479 if (env->exit_request) {
480 dprintf("interrupt exit requested\n");
485 ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
486 kvm_arch_post_run(env, run);
488 if (ret == -EINTR || ret == -EAGAIN) {
489 dprintf("io window exit\n");
495 dprintf("kvm run failed %s\n", strerror(-ret));
499 kvm_run_coalesced_mmio(env, run);
501 ret = 0; /* exit loop */
502 switch (run->exit_reason) {
504 dprintf("handle_io\n");
505 ret = kvm_handle_io(env, run->io.port,
506 (uint8_t *)run + run->io.data_offset,
512 dprintf("handle_mmio\n");
513 cpu_physical_memory_rw(run->mmio.phys_addr,
519 case KVM_EXIT_IRQ_WINDOW_OPEN:
520 dprintf("irq_window_open\n");
522 case KVM_EXIT_SHUTDOWN:
523 dprintf("shutdown\n");
524 qemu_system_reset_request();
527 case KVM_EXIT_UNKNOWN:
528 dprintf("kvm_exit_unknown\n");
530 case KVM_EXIT_FAIL_ENTRY:
531 dprintf("kvm_exit_fail_entry\n");
533 case KVM_EXIT_EXCEPTION:
534 dprintf("kvm_exit_exception\n");
537 dprintf("kvm_exit_debug\n");
538 #ifdef KVM_CAP_SET_GUEST_DEBUG
539 if (kvm_arch_debug(&run->debug.arch)) {
540 gdb_set_stop_cpu(env);
542 env->exception_index = EXCP_DEBUG;
545 /* re-enter, this exception was guest-internal */
547 #endif /* KVM_CAP_SET_GUEST_DEBUG */
550 dprintf("kvm_arch_handle_exit\n");
551 ret = kvm_arch_handle_exit(env, run);
556 if (env->exit_request) {
557 env->exit_request = 0;
558 env->exception_index = EXCP_INTERRUPT;
564 void kvm_set_phys_mem(target_phys_addr_t start_addr,
566 ram_addr_t phys_offset)
568 KVMState *s = kvm_state;
569 ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
572 if (start_addr & ~TARGET_PAGE_MASK) {
573 fprintf(stderr, "Only page-aligned memory slots supported\n");
577 /* KVM does not support read-only slots */
578 phys_offset &= ~IO_MEM_ROM;
580 mem = kvm_lookup_slot(s, start_addr);
582 if (flags >= IO_MEM_UNASSIGNED) {
583 mem->memory_size = 0;
584 mem->start_addr = start_addr;
585 mem->phys_offset = 0;
588 kvm_set_user_memory_region(s, mem);
589 } else if (start_addr >= mem->start_addr &&
590 (start_addr + size) <= (mem->start_addr +
593 target_phys_addr_t mem_start;
594 ram_addr_t mem_size, mem_offset;
597 if ((phys_offset - (start_addr - mem->start_addr)) ==
601 /* unregister whole slot */
602 memcpy(&slot, mem, sizeof(slot));
603 mem->memory_size = 0;
604 kvm_set_user_memory_region(s, mem);
606 /* register prefix slot */
607 mem_start = slot.start_addr;
608 mem_size = start_addr - slot.start_addr;
609 mem_offset = slot.phys_offset;
611 kvm_set_phys_mem(mem_start, mem_size, mem_offset);
613 /* register new slot */
614 kvm_set_phys_mem(start_addr, size, phys_offset);
616 /* register suffix slot */
617 mem_start = start_addr + size;
618 mem_offset += mem_size + size;
619 mem_size = slot.memory_size - mem_size - size;
621 kvm_set_phys_mem(mem_start, mem_size, mem_offset);
625 printf("Registering overlapping slot\n");
629 /* KVM does not need to know about this memory */
630 if (flags >= IO_MEM_UNASSIGNED)
633 mem = kvm_alloc_slot(s);
634 mem->memory_size = size;
635 mem->start_addr = start_addr;
636 mem->phys_offset = phys_offset;
639 kvm_set_user_memory_region(s, mem);
640 /* FIXME deal with errors */
643 int kvm_ioctl(KVMState *s, int type, ...)
650 arg = va_arg(ap, void *);
653 ret = ioctl(s->fd, type, arg);
660 int kvm_vm_ioctl(KVMState *s, int type, ...)
667 arg = va_arg(ap, void *);
670 ret = ioctl(s->vmfd, type, arg);
677 int kvm_vcpu_ioctl(CPUState *env, int type, ...)
684 arg = va_arg(ap, void *);
687 ret = ioctl(env->kvm_fd, type, arg);
694 int kvm_has_sync_mmu(void)
696 #ifdef KVM_CAP_SYNC_MMU
697 KVMState *s = kvm_state;
699 if (kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_SYNC_MMU) > 0)
706 #ifdef KVM_CAP_SET_GUEST_DEBUG
707 struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env,
710 struct kvm_sw_breakpoint *bp;
712 TAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) {
719 int kvm_sw_breakpoints_active(CPUState *env)
721 return !TAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
724 int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
726 struct kvm_guest_debug dbg;
729 if (env->singlestep_enabled)
730 dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
732 kvm_arch_update_guest_debug(env, &dbg);
733 dbg.control |= reinject_trap;
735 return kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg);
738 int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
739 target_ulong len, int type)
741 struct kvm_sw_breakpoint *bp;
745 if (type == GDB_BREAKPOINT_SW) {
746 bp = kvm_find_sw_breakpoint(current_env, addr);
752 bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint));
758 err = kvm_arch_insert_sw_breakpoint(current_env, bp);
764 TAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints,
767 err = kvm_arch_insert_hw_breakpoint(addr, len, type);
772 for (env = first_cpu; env != NULL; env = env->next_cpu) {
773 err = kvm_update_guest_debug(env, 0);
780 int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
781 target_ulong len, int type)
783 struct kvm_sw_breakpoint *bp;
787 if (type == GDB_BREAKPOINT_SW) {
788 bp = kvm_find_sw_breakpoint(current_env, addr);
792 if (bp->use_count > 1) {
797 err = kvm_arch_remove_sw_breakpoint(current_env, bp);
801 TAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry);
804 err = kvm_arch_remove_hw_breakpoint(addr, len, type);
809 for (env = first_cpu; env != NULL; env = env->next_cpu) {
810 err = kvm_update_guest_debug(env, 0);
817 void kvm_remove_all_breakpoints(CPUState *current_env)
819 struct kvm_sw_breakpoint *bp, *next;
820 KVMState *s = current_env->kvm_state;
823 TAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) {
824 if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) {
825 /* Try harder to find a CPU that currently sees the breakpoint. */
826 for (env = first_cpu; env != NULL; env = env->next_cpu) {
827 if (kvm_arch_remove_sw_breakpoint(env, bp) == 0)
832 kvm_arch_remove_all_hw_breakpoints();
834 for (env = first_cpu; env != NULL; env = env->next_cpu)
835 kvm_update_guest_debug(env, 0);
838 #else /* !KVM_CAP_SET_GUEST_DEBUG */
840 int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
845 int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
846 target_ulong len, int type)
851 int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
852 target_ulong len, int type)
857 void kvm_remove_all_breakpoints(CPUState *current_env)
860 #endif /* !KVM_CAP_SET_GUEST_DEBUG */