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