4 * Copyright IBM, Corp. 2008
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
10 * See the COPYING file in the top-level directory.
14 #include <sys/types.h>
15 #include <sys/ioctl.h>
19 #include <linux/kvm.h>
21 #include "qemu-common.h"
28 #define dprintf(fmt, ...) \
29 do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
31 #define dprintf(fmt, ...) \
35 typedef struct KVMSlot
37 target_phys_addr_t start_addr;
38 ram_addr_t memory_size;
39 ram_addr_t phys_offset;
53 static KVMState *kvm_state;
55 static KVMSlot *kvm_alloc_slot(KVMState *s)
59 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
60 /* KVM private memory slots */
63 if (s->slots[i].memory_size == 0)
70 static KVMSlot *kvm_lookup_slot(KVMState *s, target_phys_addr_t start_addr)
74 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
75 KVMSlot *mem = &s->slots[i];
77 if (start_addr >= mem->start_addr &&
78 start_addr < (mem->start_addr + mem->memory_size))
85 int kvm_init_vcpu(CPUState *env)
87 KVMState *s = kvm_state;
91 dprintf("kvm_init_vcpu\n");
93 ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index);
95 dprintf("kvm_create_vcpu failed\n");
102 mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
104 dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n");
108 env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
110 if (env->kvm_run == MAP_FAILED) {
112 dprintf("mmap'ing vcpu state failed\n");
116 ret = kvm_arch_init_vcpu(env);
122 int kvm_init(int smp_cpus)
131 s = qemu_mallocz(sizeof(KVMState));
135 for (i = 0; i < ARRAY_SIZE(s->slots); i++)
136 s->slots[i].slot = i;
139 s->fd = open("/dev/kvm", O_RDWR);
141 fprintf(stderr, "Could not access KVM kernel module: %m\n");
146 ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
147 if (ret < KVM_API_VERSION) {
150 fprintf(stderr, "kvm version too old\n");
154 if (ret > KVM_API_VERSION) {
156 fprintf(stderr, "kvm version not supported\n");
160 s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
164 /* initially, KVM allocated its own memory and we had to jump through
165 * hooks to make phys_ram_base point to this. Modern versions of KVM
166 * just use a user allocated buffer so we can use phys_ram_base
167 * unmodified. Make sure we have a sufficiently modern version of KVM.
169 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY);
173 fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n");
177 ret = kvm_arch_init(s, smp_cpus);
197 static int kvm_handle_io(CPUState *env, uint16_t port, void *data,
198 int direction, int size, uint32_t count)
203 for (i = 0; i < count; i++) {
204 if (direction == KVM_EXIT_IO_IN) {
207 stb_p(ptr, cpu_inb(env, port));
210 stw_p(ptr, cpu_inw(env, port));
213 stl_p(ptr, cpu_inl(env, port));
219 cpu_outb(env, port, ldub_p(ptr));
222 cpu_outw(env, port, lduw_p(ptr));
225 cpu_outl(env, port, ldl_p(ptr));
236 int kvm_cpu_exec(CPUState *env)
238 struct kvm_run *run = env->kvm_run;
241 dprintf("kvm_cpu_exec()\n");
244 kvm_arch_pre_run(env, run);
246 if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
247 dprintf("interrupt exit requested\n");
252 ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
253 kvm_arch_post_run(env, run);
255 if (ret == -EINTR || ret == -EAGAIN) {
256 dprintf("io window exit\n");
262 dprintf("kvm run failed %s\n", strerror(-ret));
266 ret = 0; /* exit loop */
267 switch (run->exit_reason) {
269 dprintf("handle_io\n");
270 ret = kvm_handle_io(env, run->io.port,
271 (uint8_t *)run + run->io.data_offset,
277 dprintf("handle_mmio\n");
278 cpu_physical_memory_rw(run->mmio.phys_addr,
284 case KVM_EXIT_IRQ_WINDOW_OPEN:
285 dprintf("irq_window_open\n");
287 case KVM_EXIT_SHUTDOWN:
288 dprintf("shutdown\n");
289 qemu_system_reset_request();
292 case KVM_EXIT_UNKNOWN:
293 dprintf("kvm_exit_unknown\n");
295 case KVM_EXIT_FAIL_ENTRY:
296 dprintf("kvm_exit_fail_entry\n");
298 case KVM_EXIT_EXCEPTION:
299 dprintf("kvm_exit_exception\n");
302 dprintf("kvm_exit_debug\n");
305 dprintf("kvm_arch_handle_exit\n");
306 ret = kvm_arch_handle_exit(env, run);
311 if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
312 env->interrupt_request &= ~CPU_INTERRUPT_EXIT;
313 env->exception_index = EXCP_INTERRUPT;
319 static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot)
321 struct kvm_userspace_memory_region mem;
323 mem.slot = slot->slot;
324 mem.guest_phys_addr = slot->start_addr;
325 mem.memory_size = slot->memory_size;
326 mem.userspace_addr = (unsigned long)phys_ram_base + slot->phys_offset;
327 mem.flags = slot->flags;
329 return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
332 void kvm_set_phys_mem(target_phys_addr_t start_addr,
334 ram_addr_t phys_offset)
336 KVMState *s = kvm_state;
337 ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
340 /* KVM does not support read-only slots */
341 phys_offset &= ~IO_MEM_ROM;
343 mem = kvm_lookup_slot(s, start_addr);
345 if ((flags == IO_MEM_UNASSIGNED) || (flags >= TLB_MMIO)) {
346 mem->memory_size = 0;
347 mem->start_addr = start_addr;
348 mem->phys_offset = 0;
351 kvm_set_user_memory_region(s, mem);
352 } else if (start_addr >= mem->start_addr &&
353 (start_addr + size) <= (mem->start_addr +
356 target_phys_addr_t mem_start;
357 ram_addr_t mem_size, mem_offset;
360 if ((phys_offset - (start_addr - mem->start_addr)) ==
364 /* unregister whole slot */
365 memcpy(&slot, mem, sizeof(slot));
366 mem->memory_size = 0;
367 kvm_set_user_memory_region(s, mem);
369 /* register prefix slot */
370 mem_start = slot.start_addr;
371 mem_size = start_addr - slot.start_addr;
372 mem_offset = slot.phys_offset;
374 kvm_set_phys_mem(mem_start, mem_size, mem_offset);
376 /* register new slot */
377 kvm_set_phys_mem(start_addr, size, phys_offset);
379 /* register suffix slot */
380 mem_start = start_addr + size;
381 mem_offset += mem_size + size;
382 mem_size = slot.memory_size - mem_size - size;
384 kvm_set_phys_mem(mem_start, mem_size, mem_offset);
388 printf("Registering overlapping slot\n");
392 /* KVM does not need to know about this memory */
393 if (flags >= IO_MEM_UNASSIGNED)
396 mem = kvm_alloc_slot(s);
397 mem->memory_size = size;
398 mem->start_addr = start_addr;
399 mem->phys_offset = phys_offset;
402 kvm_set_user_memory_region(s, mem);
403 /* FIXME deal with errors */
406 int kvm_ioctl(KVMState *s, int type, ...)
413 arg = va_arg(ap, void *);
416 ret = ioctl(s->fd, type, arg);
423 int kvm_vm_ioctl(KVMState *s, int type, ...)
430 arg = va_arg(ap, void *);
433 ret = ioctl(s->vmfd, type, arg);
440 int kvm_vcpu_ioctl(CPUState *env, int type, ...)
447 arg = va_arg(ap, void *);
450 ret = ioctl(env->kvm_fd, type, arg);