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/*
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* QEMU KVM support
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include <sys/types.h> |
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#include <sys/ioctl.h> |
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#include <sys/mman.h> |
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#include <stdarg.h> |
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#include <linux/kvm.h> |
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#include "qemu-common.h" |
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#include "sysemu.h" |
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#include "kvm.h" |
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//#define DEBUG_KVM
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#ifdef DEBUG_KVM
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#define dprintf(fmt, ...) \
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do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) |
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#else
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#define dprintf(fmt, ...) \
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do { } while (0) |
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#endif
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typedef struct kvm_userspace_memory_region KVMSlot; |
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int kvm_allowed = 0; |
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struct KVMState
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{ |
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KVMSlot slots[32];
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int fd;
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int vmfd;
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}; |
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static KVMState *kvm_state;
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static KVMSlot *kvm_alloc_slot(KVMState *s)
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{ |
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int i;
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for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
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if (s->slots[i].memory_size == 0) |
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return &s->slots[i];
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} |
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return NULL; |
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} |
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static KVMSlot *kvm_lookup_slot(KVMState *s, target_phys_addr_t start_addr)
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{ |
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int i;
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for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
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KVMSlot *mem = &s->slots[i]; |
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if (start_addr >= mem->guest_phys_addr &&
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start_addr < (mem->guest_phys_addr + mem->memory_size)) |
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return mem;
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} |
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return NULL; |
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} |
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int kvm_init_vcpu(CPUState *env)
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{ |
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KVMState *s = kvm_state; |
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long mmap_size;
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int ret;
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dprintf("kvm_init_vcpu\n");
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ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index); |
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if (ret < 0) { |
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dprintf("kvm_create_vcpu failed\n");
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goto err;
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} |
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env->kvm_fd = ret; |
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env->kvm_state = s; |
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mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
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if (mmap_size < 0) { |
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dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n");
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goto err;
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} |
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env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
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env->kvm_fd, 0);
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if (env->kvm_run == MAP_FAILED) {
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ret = -errno; |
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dprintf("mmap'ing vcpu state failed\n");
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goto err;
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} |
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ret = kvm_arch_init_vcpu(env); |
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err:
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return ret;
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} |
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int kvm_init(int smp_cpus) |
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{ |
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KVMState *s; |
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int ret;
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int i;
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if (smp_cpus > 1) |
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return -EINVAL;
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s = qemu_mallocz(sizeof(KVMState));
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if (s == NULL) |
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return -ENOMEM;
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for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
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s->slots[i].slot = i; |
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s->vmfd = -1;
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s->fd = open("/dev/kvm", O_RDWR);
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if (s->fd == -1) { |
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fprintf(stderr, "Could not access KVM kernel module: %m\n");
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ret = -errno; |
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goto err;
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} |
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ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
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if (ret < KVM_API_VERSION) {
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if (ret > 0) |
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ret = -EINVAL; |
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fprintf(stderr, "kvm version too old\n");
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goto err;
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} |
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if (ret > KVM_API_VERSION) {
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ret = -EINVAL; |
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fprintf(stderr, "kvm version not supported\n");
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goto err;
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} |
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s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
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if (s->vmfd < 0) |
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goto err;
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/* initially, KVM allocated its own memory and we had to jump through
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* hooks to make phys_ram_base point to this. Modern versions of KVM
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* just use a user allocated buffer so we can use phys_ram_base
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* unmodified. Make sure we have a sufficiently modern version of KVM.
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*/
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ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY); |
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if (ret <= 0) { |
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if (ret == 0) |
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ret = -EINVAL; |
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fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n");
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goto err;
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} |
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ret = kvm_arch_init(s, smp_cpus); |
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if (ret < 0) |
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goto err;
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kvm_state = s; |
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return 0; |
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err:
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if (s) {
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if (s->vmfd != -1) |
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close(s->vmfd); |
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if (s->fd != -1) |
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close(s->fd); |
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} |
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qemu_free(s); |
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return ret;
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} |
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static int kvm_handle_io(CPUState *env, uint16_t port, void *data, |
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int direction, int size, uint32_t count) |
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{ |
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int i;
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uint8_t *ptr = data; |
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for (i = 0; i < count; i++) { |
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if (direction == KVM_EXIT_IO_IN) {
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switch (size) {
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case 1: |
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stb_p(ptr, cpu_inb(env, port)); |
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break;
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case 2: |
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stw_p(ptr, cpu_inw(env, port)); |
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break;
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case 4: |
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stl_p(ptr, cpu_inl(env, port)); |
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break;
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} |
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} else {
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switch (size) {
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case 1: |
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cpu_outb(env, port, ldub_p(ptr)); |
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break;
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case 2: |
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cpu_outw(env, port, lduw_p(ptr)); |
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break;
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case 4: |
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cpu_outl(env, port, ldl_p(ptr)); |
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break;
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} |
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} |
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ptr += size; |
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} |
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return 1; |
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} |
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int kvm_cpu_exec(CPUState *env)
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{ |
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struct kvm_run *run = env->kvm_run;
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int ret;
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dprintf("kvm_cpu_exec()\n");
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do {
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kvm_arch_pre_run(env, run); |
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if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
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dprintf("interrupt exit requested\n");
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ret = 0;
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break;
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} |
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ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
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kvm_arch_post_run(env, run); |
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if (ret == -EINTR || ret == -EAGAIN) {
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dprintf("io window exit\n");
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ret = 0;
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break;
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} |
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if (ret < 0) { |
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dprintf("kvm run failed %s\n", strerror(-ret));
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abort(); |
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} |
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ret = 0; /* exit loop */ |
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switch (run->exit_reason) {
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case KVM_EXIT_IO:
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dprintf("handle_io\n");
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ret = kvm_handle_io(env, run->io.port, |
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(uint8_t *)run + run->io.data_offset, |
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run->io.direction, |
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run->io.size, |
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run->io.count); |
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break;
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case KVM_EXIT_MMIO:
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dprintf("handle_mmio\n");
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cpu_physical_memory_rw(run->mmio.phys_addr, |
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run->mmio.data, |
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run->mmio.len, |
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run->mmio.is_write); |
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ret = 1;
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break;
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case KVM_EXIT_IRQ_WINDOW_OPEN:
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dprintf("irq_window_open\n");
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break;
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case KVM_EXIT_SHUTDOWN:
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dprintf("shutdown\n");
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qemu_system_reset_request(); |
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ret = 1;
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break;
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case KVM_EXIT_UNKNOWN:
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dprintf("kvm_exit_unknown\n");
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break;
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case KVM_EXIT_FAIL_ENTRY:
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dprintf("kvm_exit_fail_entry\n");
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break;
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case KVM_EXIT_EXCEPTION:
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dprintf("kvm_exit_exception\n");
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break;
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case KVM_EXIT_DEBUG:
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dprintf("kvm_exit_debug\n");
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break;
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default:
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dprintf("kvm_arch_handle_exit\n");
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ret = kvm_arch_handle_exit(env, run); |
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break;
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} |
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} while (ret > 0); |
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if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
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env->interrupt_request &= ~CPU_INTERRUPT_EXIT; |
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env->exception_index = EXCP_INTERRUPT; |
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} |
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return ret;
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} |
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void kvm_set_phys_mem(target_phys_addr_t start_addr,
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ram_addr_t size, |
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ram_addr_t phys_offset) |
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{ |
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KVMState *s = kvm_state; |
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ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; |
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KVMSlot *mem; |
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/* KVM does not support read-only slots */
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phys_offset &= ~IO_MEM_ROM; |
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mem = kvm_lookup_slot(s, start_addr); |
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if (mem) {
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if (flags == IO_MEM_UNASSIGNED) {
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mem->memory_size = 0;
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mem->guest_phys_addr = start_addr; |
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mem->userspace_addr = 0;
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mem->flags = 0;
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kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, mem); |
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} else if (start_addr >= mem->guest_phys_addr && |
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(start_addr + size) <= (mem->guest_phys_addr + mem->memory_size)) |
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return;
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} |
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/* KVM does not need to know about this memory */
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if (flags >= IO_MEM_UNASSIGNED)
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return;
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mem = kvm_alloc_slot(s); |
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mem->memory_size = size; |
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mem->guest_phys_addr = start_addr; |
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mem->userspace_addr = (unsigned long)(phys_ram_base + phys_offset); |
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mem->flags = 0;
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kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, mem); |
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/* FIXME deal with errors */
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} |
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int kvm_ioctl(KVMState *s, int type, ...) |
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{ |
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int ret;
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void *arg;
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va_list ap; |
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va_start(ap, type); |
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arg = va_arg(ap, void *);
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va_end(ap); |
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ret = ioctl(s->fd, type, arg); |
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if (ret == -1) |
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ret = -errno; |
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return ret;
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} |
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int kvm_vm_ioctl(KVMState *s, int type, ...) |
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{ |
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int ret;
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void *arg;
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va_list ap; |
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va_start(ap, type); |
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arg = va_arg(ap, void *);
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va_end(ap); |
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ret = ioctl(s->vmfd, type, arg); |
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if (ret == -1) |
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ret = -errno; |
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return ret;
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} |
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int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
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{ |
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int ret;
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void *arg;
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va_list ap; |
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va_start(ap, type); |
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arg = va_arg(ap, void *);
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va_end(ap); |
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ret = ioctl(env->kvm_fd, type, arg); |
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if (ret == -1) |
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ret = -errno; |
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return ret;
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} |