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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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* Red Hat, Inc. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Glauber Costa <gcosta@redhat.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 "hw/hw.h" |
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#include "gdbstub.h" |
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#include "kvm.h" |
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|
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/* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */
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#define PAGE_SIZE TARGET_PAGE_SIZE
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|
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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 KVMSlot |
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{ |
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target_phys_addr_t start_addr; |
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ram_addr_t memory_size; |
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ram_addr_t phys_offset; |
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int slot;
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int flags;
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} KVMSlot; |
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typedef struct kvm_dirty_log KVMDirtyLog; |
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int kvm_allowed = 0; |
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|
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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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int coalesced_mmio;
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int broken_set_mem_region;
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int migration_log;
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#ifdef KVM_CAP_SET_GUEST_DEBUG
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struct kvm_sw_breakpoint_head kvm_sw_breakpoints;
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#endif
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}; |
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|
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static KVMState *kvm_state;
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|
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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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|
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for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
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/* KVM private memory slots */
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if (i >= 8 && i < 12) |
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continue;
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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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|
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fprintf(stderr, "%s: no free slot available\n", __func__);
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abort(); |
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} |
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|
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static KVMSlot *kvm_lookup_matching_slot(KVMState *s,
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target_phys_addr_t start_addr, |
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target_phys_addr_t end_addr) |
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{ |
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int i;
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|
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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->start_addr &&
|
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end_addr == mem->start_addr + mem->memory_size) { |
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return mem;
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} |
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} |
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return NULL; |
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} |
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|
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/*
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* Find overlapping slot with lowest start address
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*/
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static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s,
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target_phys_addr_t start_addr, |
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target_phys_addr_t end_addr) |
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{ |
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KVMSlot *found = NULL;
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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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|
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if (mem->memory_size == 0 || |
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(found && found->start_addr < mem->start_addr)) { |
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continue;
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} |
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if (end_addr > mem->start_addr &&
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start_addr < mem->start_addr + mem->memory_size) { |
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found = mem; |
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} |
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} |
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return found;
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} |
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static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot) |
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{ |
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struct kvm_userspace_memory_region mem;
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|
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mem.slot = slot->slot; |
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mem.guest_phys_addr = slot->start_addr; |
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mem.memory_size = slot->memory_size; |
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mem.userspace_addr = (unsigned long)qemu_get_ram_ptr(slot->phys_offset); |
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mem.flags = slot->flags; |
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if (s->migration_log) {
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mem.flags |= KVM_MEM_LOG_DIRTY_PAGES; |
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} |
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return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
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} |
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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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|
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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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} |
160 |
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env->kvm_fd = ret; |
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env->kvm_state = s; |
163 |
|
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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); |
179 |
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err:
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return ret;
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} |
183 |
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int kvm_put_mp_state(CPUState *env)
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{ |
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struct kvm_mp_state mp_state = { .mp_state = env->mp_state };
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return kvm_vcpu_ioctl(env, KVM_SET_MP_STATE, &mp_state);
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} |
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int kvm_get_mp_state(CPUState *env)
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{ |
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struct kvm_mp_state mp_state;
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int ret;
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|
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ret = kvm_vcpu_ioctl(env, KVM_GET_MP_STATE, &mp_state); |
197 |
if (ret < 0) { |
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return ret;
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} |
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env->mp_state = mp_state.mp_state; |
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return 0; |
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} |
203 |
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int kvm_sync_vcpus(void) |
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{ |
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CPUState *env; |
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|
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for (env = first_cpu; env != NULL; env = env->next_cpu) { |
209 |
int ret;
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ret = kvm_arch_put_registers(env); |
212 |
if (ret)
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return ret;
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} |
215 |
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return 0; |
217 |
} |
218 |
|
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/*
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* dirty pages logging control
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*/
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static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr, |
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ram_addr_t size, int flags, int mask) |
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{ |
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KVMState *s = kvm_state; |
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KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size); |
227 |
int old_flags;
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|
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if (mem == NULL) { |
230 |
fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-" |
231 |
TARGET_FMT_plx "\n", __func__, phys_addr,
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phys_addr + size - 1);
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return -EINVAL;
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} |
235 |
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old_flags = mem->flags; |
237 |
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flags = (mem->flags & ~mask) | flags; |
239 |
mem->flags = flags; |
240 |
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/* If nothing changed effectively, no need to issue ioctl */
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if (s->migration_log) {
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flags |= KVM_MEM_LOG_DIRTY_PAGES; |
244 |
} |
245 |
if (flags == old_flags) {
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return 0; |
247 |
} |
248 |
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return kvm_set_user_memory_region(s, mem);
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} |
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int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size)
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{ |
254 |
return kvm_dirty_pages_log_change(phys_addr, size,
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KVM_MEM_LOG_DIRTY_PAGES, |
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KVM_MEM_LOG_DIRTY_PAGES); |
257 |
} |
258 |
|
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int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size)
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{ |
261 |
return kvm_dirty_pages_log_change(phys_addr, size,
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0,
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KVM_MEM_LOG_DIRTY_PAGES); |
264 |
} |
265 |
|
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int kvm_set_migration_log(int enable) |
267 |
{ |
268 |
KVMState *s = kvm_state; |
269 |
KVMSlot *mem; |
270 |
int i, err;
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|
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s->migration_log = enable; |
273 |
|
274 |
for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
275 |
mem = &s->slots[i]; |
276 |
|
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if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {
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continue;
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} |
280 |
err = kvm_set_user_memory_region(s, mem); |
281 |
if (err) {
|
282 |
return err;
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283 |
} |
284 |
} |
285 |
return 0; |
286 |
} |
287 |
|
288 |
/**
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* kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
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* This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty().
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* This means all bits are set to dirty.
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*
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* @start_add: start of logged region.
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294 |
* @end_addr: end of logged region.
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*/
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296 |
int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr,
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target_phys_addr_t end_addr) |
298 |
{ |
299 |
KVMState *s = kvm_state; |
300 |
unsigned long size, allocated_size = 0; |
301 |
target_phys_addr_t phys_addr; |
302 |
ram_addr_t addr; |
303 |
KVMDirtyLog d; |
304 |
KVMSlot *mem; |
305 |
int ret = 0; |
306 |
|
307 |
d.dirty_bitmap = NULL;
|
308 |
while (start_addr < end_addr) {
|
309 |
mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr); |
310 |
if (mem == NULL) { |
311 |
break;
|
312 |
} |
313 |
|
314 |
size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8; |
315 |
if (!d.dirty_bitmap) {
|
316 |
d.dirty_bitmap = qemu_malloc(size); |
317 |
} else if (size > allocated_size) { |
318 |
d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size); |
319 |
} |
320 |
allocated_size = size; |
321 |
memset(d.dirty_bitmap, 0, allocated_size);
|
322 |
|
323 |
d.slot = mem->slot; |
324 |
|
325 |
if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) { |
326 |
dprintf("ioctl failed %d\n", errno);
|
327 |
ret = -1;
|
328 |
break;
|
329 |
} |
330 |
|
331 |
for (phys_addr = mem->start_addr, addr = mem->phys_offset;
|
332 |
phys_addr < mem->start_addr + mem->memory_size; |
333 |
phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) { |
334 |
unsigned long *bitmap = (unsigned long *)d.dirty_bitmap; |
335 |
unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS;
|
336 |
unsigned word = nr / (sizeof(*bitmap) * 8); |
337 |
unsigned bit = nr % (sizeof(*bitmap) * 8); |
338 |
|
339 |
if ((bitmap[word] >> bit) & 1) { |
340 |
cpu_physical_memory_set_dirty(addr); |
341 |
} |
342 |
} |
343 |
start_addr = phys_addr; |
344 |
} |
345 |
qemu_free(d.dirty_bitmap); |
346 |
|
347 |
return ret;
|
348 |
} |
349 |
|
350 |
int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
|
351 |
{ |
352 |
int ret = -ENOSYS;
|
353 |
#ifdef KVM_CAP_COALESCED_MMIO
|
354 |
KVMState *s = kvm_state; |
355 |
|
356 |
if (s->coalesced_mmio) {
|
357 |
struct kvm_coalesced_mmio_zone zone;
|
358 |
|
359 |
zone.addr = start; |
360 |
zone.size = size; |
361 |
|
362 |
ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); |
363 |
} |
364 |
#endif
|
365 |
|
366 |
return ret;
|
367 |
} |
368 |
|
369 |
int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
|
370 |
{ |
371 |
int ret = -ENOSYS;
|
372 |
#ifdef KVM_CAP_COALESCED_MMIO
|
373 |
KVMState *s = kvm_state; |
374 |
|
375 |
if (s->coalesced_mmio) {
|
376 |
struct kvm_coalesced_mmio_zone zone;
|
377 |
|
378 |
zone.addr = start; |
379 |
zone.size = size; |
380 |
|
381 |
ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); |
382 |
} |
383 |
#endif
|
384 |
|
385 |
return ret;
|
386 |
} |
387 |
|
388 |
int kvm_check_extension(KVMState *s, unsigned int extension) |
389 |
{ |
390 |
int ret;
|
391 |
|
392 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension); |
393 |
if (ret < 0) { |
394 |
ret = 0;
|
395 |
} |
396 |
|
397 |
return ret;
|
398 |
} |
399 |
|
400 |
static void kvm_reset_vcpus(void *opaque) |
401 |
{ |
402 |
kvm_sync_vcpus(); |
403 |
} |
404 |
|
405 |
int kvm_init(int smp_cpus) |
406 |
{ |
407 |
static const char upgrade_note[] = |
408 |
"Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
|
409 |
"(see http://sourceforge.net/projects/kvm).\n";
|
410 |
KVMState *s; |
411 |
int ret;
|
412 |
int i;
|
413 |
|
414 |
if (smp_cpus > 1) { |
415 |
fprintf(stderr, "No SMP KVM support, use '-smp 1'\n");
|
416 |
return -EINVAL;
|
417 |
} |
418 |
|
419 |
s = qemu_mallocz(sizeof(KVMState));
|
420 |
|
421 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
422 |
TAILQ_INIT(&s->kvm_sw_breakpoints); |
423 |
#endif
|
424 |
for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
425 |
s->slots[i].slot = i; |
426 |
|
427 |
s->vmfd = -1;
|
428 |
s->fd = open("/dev/kvm", O_RDWR);
|
429 |
if (s->fd == -1) { |
430 |
fprintf(stderr, "Could not access KVM kernel module: %m\n");
|
431 |
ret = -errno; |
432 |
goto err;
|
433 |
} |
434 |
|
435 |
ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
|
436 |
if (ret < KVM_API_VERSION) {
|
437 |
if (ret > 0) |
438 |
ret = -EINVAL; |
439 |
fprintf(stderr, "kvm version too old\n");
|
440 |
goto err;
|
441 |
} |
442 |
|
443 |
if (ret > KVM_API_VERSION) {
|
444 |
ret = -EINVAL; |
445 |
fprintf(stderr, "kvm version not supported\n");
|
446 |
goto err;
|
447 |
} |
448 |
|
449 |
s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
|
450 |
if (s->vmfd < 0) |
451 |
goto err;
|
452 |
|
453 |
/* initially, KVM allocated its own memory and we had to jump through
|
454 |
* hooks to make phys_ram_base point to this. Modern versions of KVM
|
455 |
* just use a user allocated buffer so we can use regular pages
|
456 |
* unmodified. Make sure we have a sufficiently modern version of KVM.
|
457 |
*/
|
458 |
if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) {
|
459 |
ret = -EINVAL; |
460 |
fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s",
|
461 |
upgrade_note); |
462 |
goto err;
|
463 |
} |
464 |
|
465 |
/* There was a nasty bug in < kvm-80 that prevents memory slots from being
|
466 |
* destroyed properly. Since we rely on this capability, refuse to work
|
467 |
* with any kernel without this capability. */
|
468 |
if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) {
|
469 |
ret = -EINVAL; |
470 |
|
471 |
fprintf(stderr, |
472 |
"KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s",
|
473 |
upgrade_note); |
474 |
goto err;
|
475 |
} |
476 |
|
477 |
#ifdef KVM_CAP_COALESCED_MMIO
|
478 |
s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); |
479 |
#else
|
480 |
s->coalesced_mmio = 0;
|
481 |
#endif
|
482 |
|
483 |
s->broken_set_mem_region = 1;
|
484 |
#ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
|
485 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS); |
486 |
if (ret > 0) { |
487 |
s->broken_set_mem_region = 0;
|
488 |
} |
489 |
#endif
|
490 |
|
491 |
ret = kvm_arch_init(s, smp_cpus); |
492 |
if (ret < 0) |
493 |
goto err;
|
494 |
|
495 |
qemu_register_reset(kvm_reset_vcpus, INT_MAX, NULL);
|
496 |
|
497 |
kvm_state = s; |
498 |
|
499 |
return 0; |
500 |
|
501 |
err:
|
502 |
if (s) {
|
503 |
if (s->vmfd != -1) |
504 |
close(s->vmfd); |
505 |
if (s->fd != -1) |
506 |
close(s->fd); |
507 |
} |
508 |
qemu_free(s); |
509 |
|
510 |
return ret;
|
511 |
} |
512 |
|
513 |
static int kvm_handle_io(CPUState *env, uint16_t port, void *data, |
514 |
int direction, int size, uint32_t count) |
515 |
{ |
516 |
int i;
|
517 |
uint8_t *ptr = data; |
518 |
|
519 |
for (i = 0; i < count; i++) { |
520 |
if (direction == KVM_EXIT_IO_IN) {
|
521 |
switch (size) {
|
522 |
case 1: |
523 |
stb_p(ptr, cpu_inb(env, port)); |
524 |
break;
|
525 |
case 2: |
526 |
stw_p(ptr, cpu_inw(env, port)); |
527 |
break;
|
528 |
case 4: |
529 |
stl_p(ptr, cpu_inl(env, port)); |
530 |
break;
|
531 |
} |
532 |
} else {
|
533 |
switch (size) {
|
534 |
case 1: |
535 |
cpu_outb(env, port, ldub_p(ptr)); |
536 |
break;
|
537 |
case 2: |
538 |
cpu_outw(env, port, lduw_p(ptr)); |
539 |
break;
|
540 |
case 4: |
541 |
cpu_outl(env, port, ldl_p(ptr)); |
542 |
break;
|
543 |
} |
544 |
} |
545 |
|
546 |
ptr += size; |
547 |
} |
548 |
|
549 |
return 1; |
550 |
} |
551 |
|
552 |
static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run) |
553 |
{ |
554 |
#ifdef KVM_CAP_COALESCED_MMIO
|
555 |
KVMState *s = kvm_state; |
556 |
if (s->coalesced_mmio) {
|
557 |
struct kvm_coalesced_mmio_ring *ring;
|
558 |
|
559 |
ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE);
|
560 |
while (ring->first != ring->last) {
|
561 |
struct kvm_coalesced_mmio *ent;
|
562 |
|
563 |
ent = &ring->coalesced_mmio[ring->first]; |
564 |
|
565 |
cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); |
566 |
/* FIXME smp_wmb() */
|
567 |
ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
|
568 |
} |
569 |
} |
570 |
#endif
|
571 |
} |
572 |
|
573 |
int kvm_cpu_exec(CPUState *env)
|
574 |
{ |
575 |
struct kvm_run *run = env->kvm_run;
|
576 |
int ret;
|
577 |
|
578 |
dprintf("kvm_cpu_exec()\n");
|
579 |
|
580 |
do {
|
581 |
if (env->exit_request) {
|
582 |
dprintf("interrupt exit requested\n");
|
583 |
ret = 0;
|
584 |
break;
|
585 |
} |
586 |
|
587 |
kvm_arch_pre_run(env, run); |
588 |
ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
|
589 |
kvm_arch_post_run(env, run); |
590 |
|
591 |
if (ret == -EINTR || ret == -EAGAIN) {
|
592 |
dprintf("io window exit\n");
|
593 |
ret = 0;
|
594 |
break;
|
595 |
} |
596 |
|
597 |
if (ret < 0) { |
598 |
dprintf("kvm run failed %s\n", strerror(-ret));
|
599 |
abort(); |
600 |
} |
601 |
|
602 |
kvm_run_coalesced_mmio(env, run); |
603 |
|
604 |
ret = 0; /* exit loop */ |
605 |
switch (run->exit_reason) {
|
606 |
case KVM_EXIT_IO:
|
607 |
dprintf("handle_io\n");
|
608 |
ret = kvm_handle_io(env, run->io.port, |
609 |
(uint8_t *)run + run->io.data_offset, |
610 |
run->io.direction, |
611 |
run->io.size, |
612 |
run->io.count); |
613 |
break;
|
614 |
case KVM_EXIT_MMIO:
|
615 |
dprintf("handle_mmio\n");
|
616 |
cpu_physical_memory_rw(run->mmio.phys_addr, |
617 |
run->mmio.data, |
618 |
run->mmio.len, |
619 |
run->mmio.is_write); |
620 |
ret = 1;
|
621 |
break;
|
622 |
case KVM_EXIT_IRQ_WINDOW_OPEN:
|
623 |
dprintf("irq_window_open\n");
|
624 |
break;
|
625 |
case KVM_EXIT_SHUTDOWN:
|
626 |
dprintf("shutdown\n");
|
627 |
qemu_system_reset_request(); |
628 |
ret = 1;
|
629 |
break;
|
630 |
case KVM_EXIT_UNKNOWN:
|
631 |
dprintf("kvm_exit_unknown\n");
|
632 |
break;
|
633 |
case KVM_EXIT_FAIL_ENTRY:
|
634 |
dprintf("kvm_exit_fail_entry\n");
|
635 |
break;
|
636 |
case KVM_EXIT_EXCEPTION:
|
637 |
dprintf("kvm_exit_exception\n");
|
638 |
break;
|
639 |
case KVM_EXIT_DEBUG:
|
640 |
dprintf("kvm_exit_debug\n");
|
641 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
642 |
if (kvm_arch_debug(&run->debug.arch)) {
|
643 |
gdb_set_stop_cpu(env); |
644 |
vm_stop(EXCP_DEBUG); |
645 |
env->exception_index = EXCP_DEBUG; |
646 |
return 0; |
647 |
} |
648 |
/* re-enter, this exception was guest-internal */
|
649 |
ret = 1;
|
650 |
#endif /* KVM_CAP_SET_GUEST_DEBUG */ |
651 |
break;
|
652 |
default:
|
653 |
dprintf("kvm_arch_handle_exit\n");
|
654 |
ret = kvm_arch_handle_exit(env, run); |
655 |
break;
|
656 |
} |
657 |
} while (ret > 0); |
658 |
|
659 |
if (env->exit_request) {
|
660 |
env->exit_request = 0;
|
661 |
env->exception_index = EXCP_INTERRUPT; |
662 |
} |
663 |
|
664 |
return ret;
|
665 |
} |
666 |
|
667 |
void kvm_set_phys_mem(target_phys_addr_t start_addr,
|
668 |
ram_addr_t size, |
669 |
ram_addr_t phys_offset) |
670 |
{ |
671 |
KVMState *s = kvm_state; |
672 |
ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; |
673 |
KVMSlot *mem, old; |
674 |
int err;
|
675 |
|
676 |
if (start_addr & ~TARGET_PAGE_MASK) {
|
677 |
if (flags >= IO_MEM_UNASSIGNED) {
|
678 |
if (!kvm_lookup_overlapping_slot(s, start_addr,
|
679 |
start_addr + size)) { |
680 |
return;
|
681 |
} |
682 |
fprintf(stderr, "Unaligned split of a KVM memory slot\n");
|
683 |
} else {
|
684 |
fprintf(stderr, "Only page-aligned memory slots supported\n");
|
685 |
} |
686 |
abort(); |
687 |
} |
688 |
|
689 |
/* KVM does not support read-only slots */
|
690 |
phys_offset &= ~IO_MEM_ROM; |
691 |
|
692 |
while (1) { |
693 |
mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size); |
694 |
if (!mem) {
|
695 |
break;
|
696 |
} |
697 |
|
698 |
if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr &&
|
699 |
(start_addr + size <= mem->start_addr + mem->memory_size) && |
700 |
(phys_offset - start_addr == mem->phys_offset - mem->start_addr)) { |
701 |
/* The new slot fits into the existing one and comes with
|
702 |
* identical parameters - nothing to be done. */
|
703 |
return;
|
704 |
} |
705 |
|
706 |
old = *mem; |
707 |
|
708 |
/* unregister the overlapping slot */
|
709 |
mem->memory_size = 0;
|
710 |
err = kvm_set_user_memory_region(s, mem); |
711 |
if (err) {
|
712 |
fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
|
713 |
__func__, strerror(-err)); |
714 |
abort(); |
715 |
} |
716 |
|
717 |
/* Workaround for older KVM versions: we can't join slots, even not by
|
718 |
* unregistering the previous ones and then registering the larger
|
719 |
* slot. We have to maintain the existing fragmentation. Sigh.
|
720 |
*
|
721 |
* This workaround assumes that the new slot starts at the same
|
722 |
* address as the first existing one. If not or if some overlapping
|
723 |
* slot comes around later, we will fail (not seen in practice so far)
|
724 |
* - and actually require a recent KVM version. */
|
725 |
if (s->broken_set_mem_region &&
|
726 |
old.start_addr == start_addr && old.memory_size < size && |
727 |
flags < IO_MEM_UNASSIGNED) { |
728 |
mem = kvm_alloc_slot(s); |
729 |
mem->memory_size = old.memory_size; |
730 |
mem->start_addr = old.start_addr; |
731 |
mem->phys_offset = old.phys_offset; |
732 |
mem->flags = 0;
|
733 |
|
734 |
err = kvm_set_user_memory_region(s, mem); |
735 |
if (err) {
|
736 |
fprintf(stderr, "%s: error updating slot: %s\n", __func__,
|
737 |
strerror(-err)); |
738 |
abort(); |
739 |
} |
740 |
|
741 |
start_addr += old.memory_size; |
742 |
phys_offset += old.memory_size; |
743 |
size -= old.memory_size; |
744 |
continue;
|
745 |
} |
746 |
|
747 |
/* register prefix slot */
|
748 |
if (old.start_addr < start_addr) {
|
749 |
mem = kvm_alloc_slot(s); |
750 |
mem->memory_size = start_addr - old.start_addr; |
751 |
mem->start_addr = old.start_addr; |
752 |
mem->phys_offset = old.phys_offset; |
753 |
mem->flags = 0;
|
754 |
|
755 |
err = kvm_set_user_memory_region(s, mem); |
756 |
if (err) {
|
757 |
fprintf(stderr, "%s: error registering prefix slot: %s\n",
|
758 |
__func__, strerror(-err)); |
759 |
abort(); |
760 |
} |
761 |
} |
762 |
|
763 |
/* register suffix slot */
|
764 |
if (old.start_addr + old.memory_size > start_addr + size) {
|
765 |
ram_addr_t size_delta; |
766 |
|
767 |
mem = kvm_alloc_slot(s); |
768 |
mem->start_addr = start_addr + size; |
769 |
size_delta = mem->start_addr - old.start_addr; |
770 |
mem->memory_size = old.memory_size - size_delta; |
771 |
mem->phys_offset = old.phys_offset + size_delta; |
772 |
mem->flags = 0;
|
773 |
|
774 |
err = kvm_set_user_memory_region(s, mem); |
775 |
if (err) {
|
776 |
fprintf(stderr, "%s: error registering suffix slot: %s\n",
|
777 |
__func__, strerror(-err)); |
778 |
abort(); |
779 |
} |
780 |
} |
781 |
} |
782 |
|
783 |
/* in case the KVM bug workaround already "consumed" the new slot */
|
784 |
if (!size)
|
785 |
return;
|
786 |
|
787 |
/* KVM does not need to know about this memory */
|
788 |
if (flags >= IO_MEM_UNASSIGNED)
|
789 |
return;
|
790 |
|
791 |
mem = kvm_alloc_slot(s); |
792 |
mem->memory_size = size; |
793 |
mem->start_addr = start_addr; |
794 |
mem->phys_offset = phys_offset; |
795 |
mem->flags = 0;
|
796 |
|
797 |
err = kvm_set_user_memory_region(s, mem); |
798 |
if (err) {
|
799 |
fprintf(stderr, "%s: error registering slot: %s\n", __func__,
|
800 |
strerror(-err)); |
801 |
abort(); |
802 |
} |
803 |
} |
804 |
|
805 |
int kvm_ioctl(KVMState *s, int type, ...) |
806 |
{ |
807 |
int ret;
|
808 |
void *arg;
|
809 |
va_list ap; |
810 |
|
811 |
va_start(ap, type); |
812 |
arg = va_arg(ap, void *);
|
813 |
va_end(ap); |
814 |
|
815 |
ret = ioctl(s->fd, type, arg); |
816 |
if (ret == -1) |
817 |
ret = -errno; |
818 |
|
819 |
return ret;
|
820 |
} |
821 |
|
822 |
int kvm_vm_ioctl(KVMState *s, int type, ...) |
823 |
{ |
824 |
int ret;
|
825 |
void *arg;
|
826 |
va_list ap; |
827 |
|
828 |
va_start(ap, type); |
829 |
arg = va_arg(ap, void *);
|
830 |
va_end(ap); |
831 |
|
832 |
ret = ioctl(s->vmfd, type, arg); |
833 |
if (ret == -1) |
834 |
ret = -errno; |
835 |
|
836 |
return ret;
|
837 |
} |
838 |
|
839 |
int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
840 |
{ |
841 |
int ret;
|
842 |
void *arg;
|
843 |
va_list ap; |
844 |
|
845 |
va_start(ap, type); |
846 |
arg = va_arg(ap, void *);
|
847 |
va_end(ap); |
848 |
|
849 |
ret = ioctl(env->kvm_fd, type, arg); |
850 |
if (ret == -1) |
851 |
ret = -errno; |
852 |
|
853 |
return ret;
|
854 |
} |
855 |
|
856 |
int kvm_has_sync_mmu(void) |
857 |
{ |
858 |
#ifdef KVM_CAP_SYNC_MMU
|
859 |
KVMState *s = kvm_state; |
860 |
|
861 |
return kvm_check_extension(s, KVM_CAP_SYNC_MMU);
|
862 |
#else
|
863 |
return 0; |
864 |
#endif
|
865 |
} |
866 |
|
867 |
void kvm_setup_guest_memory(void *start, size_t size) |
868 |
{ |
869 |
if (!kvm_has_sync_mmu()) {
|
870 |
#ifdef MADV_DONTFORK
|
871 |
int ret = madvise(start, size, MADV_DONTFORK);
|
872 |
|
873 |
if (ret) {
|
874 |
perror("madvice");
|
875 |
exit(1);
|
876 |
} |
877 |
#else
|
878 |
fprintf(stderr, |
879 |
"Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
|
880 |
exit(1);
|
881 |
#endif
|
882 |
} |
883 |
} |
884 |
|
885 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
886 |
struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env,
|
887 |
target_ulong pc) |
888 |
{ |
889 |
struct kvm_sw_breakpoint *bp;
|
890 |
|
891 |
TAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) { |
892 |
if (bp->pc == pc)
|
893 |
return bp;
|
894 |
} |
895 |
return NULL; |
896 |
} |
897 |
|
898 |
int kvm_sw_breakpoints_active(CPUState *env)
|
899 |
{ |
900 |
return !TAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
|
901 |
} |
902 |
|
903 |
int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
904 |
{ |
905 |
struct kvm_guest_debug dbg;
|
906 |
|
907 |
dbg.control = 0;
|
908 |
if (env->singlestep_enabled)
|
909 |
dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; |
910 |
|
911 |
kvm_arch_update_guest_debug(env, &dbg); |
912 |
dbg.control |= reinject_trap; |
913 |
|
914 |
return kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg);
|
915 |
} |
916 |
|
917 |
int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
|
918 |
target_ulong len, int type)
|
919 |
{ |
920 |
struct kvm_sw_breakpoint *bp;
|
921 |
CPUState *env; |
922 |
int err;
|
923 |
|
924 |
if (type == GDB_BREAKPOINT_SW) {
|
925 |
bp = kvm_find_sw_breakpoint(current_env, addr); |
926 |
if (bp) {
|
927 |
bp->use_count++; |
928 |
return 0; |
929 |
} |
930 |
|
931 |
bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint)); |
932 |
if (!bp)
|
933 |
return -ENOMEM;
|
934 |
|
935 |
bp->pc = addr; |
936 |
bp->use_count = 1;
|
937 |
err = kvm_arch_insert_sw_breakpoint(current_env, bp); |
938 |
if (err) {
|
939 |
free(bp); |
940 |
return err;
|
941 |
} |
942 |
|
943 |
TAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints, |
944 |
bp, entry); |
945 |
} else {
|
946 |
err = kvm_arch_insert_hw_breakpoint(addr, len, type); |
947 |
if (err)
|
948 |
return err;
|
949 |
} |
950 |
|
951 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
952 |
err = kvm_update_guest_debug(env, 0);
|
953 |
if (err)
|
954 |
return err;
|
955 |
} |
956 |
return 0; |
957 |
} |
958 |
|
959 |
int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
|
960 |
target_ulong len, int type)
|
961 |
{ |
962 |
struct kvm_sw_breakpoint *bp;
|
963 |
CPUState *env; |
964 |
int err;
|
965 |
|
966 |
if (type == GDB_BREAKPOINT_SW) {
|
967 |
bp = kvm_find_sw_breakpoint(current_env, addr); |
968 |
if (!bp)
|
969 |
return -ENOENT;
|
970 |
|
971 |
if (bp->use_count > 1) { |
972 |
bp->use_count--; |
973 |
return 0; |
974 |
} |
975 |
|
976 |
err = kvm_arch_remove_sw_breakpoint(current_env, bp); |
977 |
if (err)
|
978 |
return err;
|
979 |
|
980 |
TAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry); |
981 |
qemu_free(bp); |
982 |
} else {
|
983 |
err = kvm_arch_remove_hw_breakpoint(addr, len, type); |
984 |
if (err)
|
985 |
return err;
|
986 |
} |
987 |
|
988 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
989 |
err = kvm_update_guest_debug(env, 0);
|
990 |
if (err)
|
991 |
return err;
|
992 |
} |
993 |
return 0; |
994 |
} |
995 |
|
996 |
void kvm_remove_all_breakpoints(CPUState *current_env)
|
997 |
{ |
998 |
struct kvm_sw_breakpoint *bp, *next;
|
999 |
KVMState *s = current_env->kvm_state; |
1000 |
CPUState *env; |
1001 |
|
1002 |
TAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { |
1003 |
if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) { |
1004 |
/* Try harder to find a CPU that currently sees the breakpoint. */
|
1005 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1006 |
if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) |
1007 |
break;
|
1008 |
} |
1009 |
} |
1010 |
} |
1011 |
kvm_arch_remove_all_hw_breakpoints(); |
1012 |
|
1013 |
for (env = first_cpu; env != NULL; env = env->next_cpu) |
1014 |
kvm_update_guest_debug(env, 0);
|
1015 |
} |
1016 |
|
1017 |
#else /* !KVM_CAP_SET_GUEST_DEBUG */ |
1018 |
|
1019 |
int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
1020 |
{ |
1021 |
return -EINVAL;
|
1022 |
} |
1023 |
|
1024 |
int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
|
1025 |
target_ulong len, int type)
|
1026 |
{ |
1027 |
return -EINVAL;
|
1028 |
} |
1029 |
|
1030 |
int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
|
1031 |
target_ulong len, int type)
|
1032 |
{ |
1033 |
return -EINVAL;
|
1034 |
} |
1035 |
|
1036 |
void kvm_remove_all_breakpoints(CPUState *current_env)
|
1037 |
{ |
1038 |
} |
1039 |
#endif /* !KVM_CAP_SET_GUEST_DEBUG */ |