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 kvm_userspace_memory_region KVMSlot;
46 static KVMState *kvm_state;
48 static KVMSlot *kvm_alloc_slot(KVMState *s)
52 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
53 /* KVM private memory slots */
56 if (s->slots[i].memory_size == 0)
63 static KVMSlot *kvm_lookup_slot(KVMState *s, target_phys_addr_t start_addr)
67 for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
68 KVMSlot *mem = &s->slots[i];
70 if (start_addr >= mem->guest_phys_addr &&
71 start_addr < (mem->guest_phys_addr + mem->memory_size))
78 int kvm_init_vcpu(CPUState *env)
80 KVMState *s = kvm_state;
84 dprintf("kvm_init_vcpu\n");
86 ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index);
88 dprintf("kvm_create_vcpu failed\n");
95 mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
97 dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n");
101 env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
103 if (env->kvm_run == MAP_FAILED) {
105 dprintf("mmap'ing vcpu state failed\n");
109 ret = kvm_arch_init_vcpu(env);
115 int kvm_init(int smp_cpus)
124 s = qemu_mallocz(sizeof(KVMState));
128 for (i = 0; i < ARRAY_SIZE(s->slots); i++)
129 s->slots[i].slot = i;
132 s->fd = open("/dev/kvm", O_RDWR);
134 fprintf(stderr, "Could not access KVM kernel module: %m\n");
139 ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
140 if (ret < KVM_API_VERSION) {
143 fprintf(stderr, "kvm version too old\n");
147 if (ret > KVM_API_VERSION) {
149 fprintf(stderr, "kvm version not supported\n");
153 s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
157 /* initially, KVM allocated its own memory and we had to jump through
158 * hooks to make phys_ram_base point to this. Modern versions of KVM
159 * just use a user allocated buffer so we can use phys_ram_base
160 * unmodified. Make sure we have a sufficiently modern version of KVM.
162 ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY);
166 fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n");
170 ret = kvm_arch_init(s, smp_cpus);
190 static int kvm_handle_io(CPUState *env, uint16_t port, void *data,
191 int direction, int size, uint32_t count)
196 for (i = 0; i < count; i++) {
197 if (direction == KVM_EXIT_IO_IN) {
200 stb_p(ptr, cpu_inb(env, port));
203 stw_p(ptr, cpu_inw(env, port));
206 stl_p(ptr, cpu_inl(env, port));
212 cpu_outb(env, port, ldub_p(ptr));
215 cpu_outw(env, port, lduw_p(ptr));
218 cpu_outl(env, port, ldl_p(ptr));
229 int kvm_cpu_exec(CPUState *env)
231 struct kvm_run *run = env->kvm_run;
234 dprintf("kvm_cpu_exec()\n");
237 kvm_arch_pre_run(env, run);
239 if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
240 dprintf("interrupt exit requested\n");
245 ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
246 kvm_arch_post_run(env, run);
248 if (ret == -EINTR || ret == -EAGAIN) {
249 dprintf("io window exit\n");
255 dprintf("kvm run failed %s\n", strerror(-ret));
259 ret = 0; /* exit loop */
260 switch (run->exit_reason) {
262 dprintf("handle_io\n");
263 ret = kvm_handle_io(env, run->io.port,
264 (uint8_t *)run + run->io.data_offset,
270 dprintf("handle_mmio\n");
271 cpu_physical_memory_rw(run->mmio.phys_addr,
277 case KVM_EXIT_IRQ_WINDOW_OPEN:
278 dprintf("irq_window_open\n");
280 case KVM_EXIT_SHUTDOWN:
281 dprintf("shutdown\n");
282 qemu_system_reset_request();
285 case KVM_EXIT_UNKNOWN:
286 dprintf("kvm_exit_unknown\n");
288 case KVM_EXIT_FAIL_ENTRY:
289 dprintf("kvm_exit_fail_entry\n");
291 case KVM_EXIT_EXCEPTION:
292 dprintf("kvm_exit_exception\n");
295 dprintf("kvm_exit_debug\n");
298 dprintf("kvm_arch_handle_exit\n");
299 ret = kvm_arch_handle_exit(env, run);
304 if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
305 env->interrupt_request &= ~CPU_INTERRUPT_EXIT;
306 env->exception_index = EXCP_INTERRUPT;
312 void kvm_set_phys_mem(target_phys_addr_t start_addr,
314 ram_addr_t phys_offset)
316 KVMState *s = kvm_state;
317 ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
320 /* KVM does not support read-only slots */
321 phys_offset &= ~IO_MEM_ROM;
323 mem = kvm_lookup_slot(s, start_addr);
325 if (flags == IO_MEM_UNASSIGNED) {
326 mem->memory_size = 0;
327 mem->guest_phys_addr = start_addr;
328 mem->userspace_addr = 0;
331 kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, mem);
332 } else if (start_addr >= mem->guest_phys_addr &&
333 (start_addr + size) <= (mem->guest_phys_addr +
336 target_phys_addr_t mem_start;
337 ram_addr_t mem_size, mem_offset;
340 if ((phys_offset - (start_addr - mem->guest_phys_addr)) ==
341 ((uint8_t *)mem->userspace_addr - phys_ram_base))
344 /* unregister whole slot */
345 memcpy(&slot, mem, sizeof(slot));
346 mem->memory_size = 0;
347 kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, mem);
349 /* register prefix slot */
350 mem_start = slot.guest_phys_addr;
351 mem_size = start_addr - slot.guest_phys_addr;
352 mem_offset = (uint8_t *)slot.userspace_addr - phys_ram_base;
354 kvm_set_phys_mem(mem_start, mem_size, mem_offset);
356 /* register new slot */
357 kvm_set_phys_mem(start_addr, size, phys_offset);
359 /* register suffix slot */
360 mem_start = start_addr + size;
361 mem_offset += mem_size + size;
362 mem_size = slot.memory_size - mem_size - size;
364 kvm_set_phys_mem(mem_start, mem_size, mem_offset);
368 printf("Registering overlapping slot\n");
372 /* KVM does not need to know about this memory */
373 if (flags >= IO_MEM_UNASSIGNED)
376 mem = kvm_alloc_slot(s);
377 mem->memory_size = size;
378 mem->guest_phys_addr = start_addr;
379 mem->userspace_addr = (unsigned long)(phys_ram_base + phys_offset);
382 kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, mem);
383 /* FIXME deal with errors */
386 int kvm_ioctl(KVMState *s, int type, ...)
393 arg = va_arg(ap, void *);
396 ret = ioctl(s->fd, type, arg);
403 int kvm_vm_ioctl(KVMState *s, int type, ...)
410 arg = va_arg(ap, void *);
413 ret = ioctl(s->vmfd, type, arg);
420 int kvm_vcpu_ioctl(CPUState *env, int type, ...)
427 arg = va_arg(ap, void *);
430 ret = ioctl(env->kvm_fd, type, arg);