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"
30 #define dprintf(fmt, ...) \
31 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
33 #define dprintf(fmt, ...) \
37 typedef struct KVMSlot
39 target_phys_addr_t start_addr;
40 ram_addr_t memory_size;
41 ram_addr_t phys_offset;
46 typedef struct kvm_dirty_log KVMDirtyLog;
57 static KVMState *kvm_state;
59 static KVMSlot *kvm_alloc_slot(KVMState *s)
63 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
64 /* KVM private memory slots */
67 if (s->slots[i].memory_size == 0)
74 static KVMSlot *kvm_lookup_slot(KVMState *s, target_phys_addr_t start_addr)
78 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
79 KVMSlot *mem = &s->slots[i];
81 if (start_addr >= mem->start_addr &&
82 start_addr < (mem->start_addr + mem->memory_size))
89 static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot)
91 struct kvm_userspace_memory_region mem;
93 mem.slot = slot->slot;
94 mem.guest_phys_addr = slot->start_addr;
95 mem.memory_size = slot->memory_size;
96 mem.userspace_addr = (unsigned long)phys_ram_base + slot->phys_offset;
97 mem.flags = slot->flags;
99 return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
103 int kvm_init_vcpu(CPUState *env)
105 KVMState *s = kvm_state;
109 dprintf("kvm_init_vcpu\n");
111 ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index);
113 dprintf("kvm_create_vcpu failed\n");
120 mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
122 dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n");
126 env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
128 if (env->kvm_run == MAP_FAILED) {
130 dprintf("mmap'ing vcpu state failed\n");
134 ret = kvm_arch_init_vcpu(env);
141 * dirty pages logging control
143 static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr, target_phys_addr_t end_addr,
147 KVMState *s = kvm_state;
148 KVMSlot *mem = kvm_lookup_slot(s, phys_addr);
150 dprintf("invalid parameters %llx-%llx\n", phys_addr, end_addr);
154 flags = (mem->flags & ~mask) | flags;
155 /* Nothing changed, no need to issue ioctl */
156 if (flags == mem->flags)
161 return kvm_set_user_memory_region(s, mem);
164 int kvm_log_start(target_phys_addr_t phys_addr, target_phys_addr_t end_addr)
166 return kvm_dirty_pages_log_change(phys_addr, end_addr,
167 KVM_MEM_LOG_DIRTY_PAGES,
168 KVM_MEM_LOG_DIRTY_PAGES);
171 int kvm_log_stop(target_phys_addr_t phys_addr, target_phys_addr_t end_addr)
173 return kvm_dirty_pages_log_change(phys_addr, end_addr,
175 KVM_MEM_LOG_DIRTY_PAGES);
179 * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
180 * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty().
181 * This means all bits are set to dirty.
183 * @start_add: start of logged region. This is what we use to search the memslot
184 * @end_addr: end of logged region.
186 void kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, target_phys_addr_t end_addr)
188 KVMState *s = kvm_state;
190 KVMSlot *mem = kvm_lookup_slot(s, start_addr);
191 unsigned long alloc_size;
193 target_phys_addr_t phys_addr = start_addr;
195 dprintf("sync addr: %llx into %lx\n", start_addr, mem->phys_offset);
197 fprintf(stderr, "BUG: %s: invalid parameters\n", __func__);
201 alloc_size = mem->memory_size >> TARGET_PAGE_BITS / sizeof(d.dirty_bitmap);
202 d.dirty_bitmap = qemu_mallocz(alloc_size);
204 if (d.dirty_bitmap == NULL) {
205 dprintf("Could not allocate dirty bitmap\n");
210 dprintf("slot %d, phys_addr %llx, uaddr: %llx\n",
211 d.slot, mem->start_addr, mem->phys_offset);
213 if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
214 dprintf("ioctl failed %d\n", errno);
218 phys_addr = start_addr;
219 for (addr = mem->phys_offset; phys_addr < end_addr; phys_addr+= TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) {
220 unsigned long *bitmap = (unsigned long *)d.dirty_bitmap;
221 unsigned nr = (phys_addr - start_addr) >> TARGET_PAGE_BITS;
222 unsigned word = nr / (sizeof(*bitmap) * 8);
223 unsigned bit = nr % (sizeof(*bitmap) * 8);
224 if ((bitmap[word] >> bit) & 1)
225 cpu_physical_memory_set_dirty(addr);
228 qemu_free(d.dirty_bitmap);
231 int kvm_init(int smp_cpus)
240 s = qemu_mallocz(sizeof(KVMState));
244 for (i = 0; i < ARRAY_SIZE(s->slots); i++)
245 s->slots[i].slot = i;
248 s->fd = open("/dev/kvm", O_RDWR);
250 fprintf(stderr, "Could not access KVM kernel module: %m\n");
255 ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
256 if (ret < KVM_API_VERSION) {
259 fprintf(stderr, "kvm version too old\n");
263 if (ret > KVM_API_VERSION) {
265 fprintf(stderr, "kvm version not supported\n");
269 s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
273 /* initially, KVM allocated its own memory and we had to jump through
274 * hooks to make phys_ram_base point to this. Modern versions of KVM
275 * just use a user allocated buffer so we can use phys_ram_base
276 * unmodified. Make sure we have a sufficiently modern version of KVM.
278 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY);
282 fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n");
286 /* There was a nasty bug in < kvm-80 that prevents memory slots from being
287 * destroyed properly. Since we rely on this capability, refuse to work
288 * with any kernel without this capability. */
289 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION,
290 KVM_CAP_DESTROY_MEMORY_REGION_WORKS);
296 "KVM kernel module broken (DESTROY_MEMORY_REGION)\n"
297 "Please upgrade to at least kvm-81.\n");
301 ret = kvm_arch_init(s, smp_cpus);
321 static int kvm_handle_io(CPUState *env, uint16_t port, void *data,
322 int direction, int size, uint32_t count)
327 for (i = 0; i < count; i++) {
328 if (direction == KVM_EXIT_IO_IN) {
331 stb_p(ptr, cpu_inb(env, port));
334 stw_p(ptr, cpu_inw(env, port));
337 stl_p(ptr, cpu_inl(env, port));
343 cpu_outb(env, port, ldub_p(ptr));
346 cpu_outw(env, port, lduw_p(ptr));
349 cpu_outl(env, port, ldl_p(ptr));
360 int kvm_cpu_exec(CPUState *env)
362 struct kvm_run *run = env->kvm_run;
365 dprintf("kvm_cpu_exec()\n");
368 kvm_arch_pre_run(env, run);
370 if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
371 dprintf("interrupt exit requested\n");
376 ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
377 kvm_arch_post_run(env, run);
379 if (ret == -EINTR || ret == -EAGAIN) {
380 dprintf("io window exit\n");
386 dprintf("kvm run failed %s\n", strerror(-ret));
390 ret = 0; /* exit loop */
391 switch (run->exit_reason) {
393 dprintf("handle_io\n");
394 ret = kvm_handle_io(env, run->io.port,
395 (uint8_t *)run + run->io.data_offset,
401 dprintf("handle_mmio\n");
402 cpu_physical_memory_rw(run->mmio.phys_addr,
408 case KVM_EXIT_IRQ_WINDOW_OPEN:
409 dprintf("irq_window_open\n");
411 case KVM_EXIT_SHUTDOWN:
412 dprintf("shutdown\n");
413 qemu_system_reset_request();
416 case KVM_EXIT_UNKNOWN:
417 dprintf("kvm_exit_unknown\n");
419 case KVM_EXIT_FAIL_ENTRY:
420 dprintf("kvm_exit_fail_entry\n");
422 case KVM_EXIT_EXCEPTION:
423 dprintf("kvm_exit_exception\n");
426 dprintf("kvm_exit_debug\n");
429 dprintf("kvm_arch_handle_exit\n");
430 ret = kvm_arch_handle_exit(env, run);
435 if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
436 env->interrupt_request &= ~CPU_INTERRUPT_EXIT;
437 env->exception_index = EXCP_INTERRUPT;
443 void kvm_set_phys_mem(target_phys_addr_t start_addr,
445 ram_addr_t phys_offset)
447 KVMState *s = kvm_state;
448 ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
451 /* KVM does not support read-only slots */
452 phys_offset &= ~IO_MEM_ROM;
454 mem = kvm_lookup_slot(s, start_addr);
456 if ((flags == IO_MEM_UNASSIGNED) || (flags >= TLB_MMIO)) {
457 mem->memory_size = 0;
458 mem->start_addr = start_addr;
459 mem->phys_offset = 0;
462 kvm_set_user_memory_region(s, mem);
463 } else if (start_addr >= mem->start_addr &&
464 (start_addr + size) <= (mem->start_addr +
467 target_phys_addr_t mem_start;
468 ram_addr_t mem_size, mem_offset;
471 if ((phys_offset - (start_addr - mem->start_addr)) ==
475 /* unregister whole slot */
476 memcpy(&slot, mem, sizeof(slot));
477 mem->memory_size = 0;
478 kvm_set_user_memory_region(s, mem);
480 /* register prefix slot */
481 mem_start = slot.start_addr;
482 mem_size = start_addr - slot.start_addr;
483 mem_offset = slot.phys_offset;
485 kvm_set_phys_mem(mem_start, mem_size, mem_offset);
487 /* register new slot */
488 kvm_set_phys_mem(start_addr, size, phys_offset);
490 /* register suffix slot */
491 mem_start = start_addr + size;
492 mem_offset += mem_size + size;
493 mem_size = slot.memory_size - mem_size - size;
495 kvm_set_phys_mem(mem_start, mem_size, mem_offset);
499 printf("Registering overlapping slot\n");
503 /* KVM does not need to know about this memory */
504 if (flags >= IO_MEM_UNASSIGNED)
507 mem = kvm_alloc_slot(s);
508 mem->memory_size = size;
509 mem->start_addr = start_addr;
510 mem->phys_offset = phys_offset;
513 kvm_set_user_memory_region(s, mem);
514 /* FIXME deal with errors */
517 int kvm_ioctl(KVMState *s, int type, ...)
524 arg = va_arg(ap, void *);
527 ret = ioctl(s->fd, type, arg);
534 int kvm_vm_ioctl(KVMState *s, int type, ...)
541 arg = va_arg(ap, void *);
544 ret = ioctl(s->vmfd, type, arg);
551 int kvm_vcpu_ioctl(CPUState *env, int type, ...)
558 arg = va_arg(ap, void *);
561 ret = ioctl(env->kvm_fd, type, arg);
568 int kvm_has_sync_mmu(void)
570 KVMState *s = kvm_state;
572 #ifdef KVM_CAP_SYNC_MMU
573 if (kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_SYNC_MMU) > 0)