diff options
Diffstat (limited to 'kvm-all.c')
| -rw-r--r-- | kvm-all.c | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/kvm-all.c b/kvm-all.c new file mode 100644 index 0000000000..c3a46e2438 --- /dev/null +++ b/kvm-all.c @@ -0,0 +1,374 @@ +/* + * 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; +} |