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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 "qemu-barrier.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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//#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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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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#ifdef KVM_CAP_COALESCED_MMIO
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struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
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#endif
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int broken_set_mem_region;
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int migration_log;
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int vcpu_events;
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int robust_singlestep;
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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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int irqchip_in_kernel;
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int pit_in_kernel;
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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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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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* 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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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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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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static void kvm_reset_vcpu(void *opaque) |
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{ |
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CPUState *env = opaque; |
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kvm_arch_reset_vcpu(env); |
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if (kvm_arch_put_registers(env)) {
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fprintf(stderr, "Fatal: kvm vcpu reset failed\n");
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abort(); |
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} |
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} |
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int kvm_irqchip_in_kernel(void) |
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{ |
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return kvm_state->irqchip_in_kernel;
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} |
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int kvm_pit_in_kernel(void) |
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{ |
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return kvm_state->pit_in_kernel;
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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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#ifdef KVM_CAP_COALESCED_MMIO
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if (s->coalesced_mmio && !s->coalesced_mmio_ring)
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s->coalesced_mmio_ring = (void *) env->kvm_run +
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s->coalesced_mmio * PAGE_SIZE; |
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#endif
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ret = kvm_arch_init_vcpu(env); |
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if (ret == 0) { |
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qemu_register_reset(kvm_reset_vcpu, env); |
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kvm_arch_reset_vcpu(env); |
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ret = kvm_arch_put_registers(env); |
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} |
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err:
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return ret;
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} |
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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); |
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int old_flags;
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if (mem == NULL) { |
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fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-" |
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TARGET_FMT_plx "\n", __func__, phys_addr,
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(target_phys_addr_t)(phys_addr + size - 1));
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return -EINVAL;
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} |
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old_flags = mem->flags; |
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flags = (mem->flags & ~mask) | flags; |
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mem->flags = flags; |
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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; |
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} |
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if (flags == old_flags) {
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return 0; |
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} |
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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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{ |
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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); |
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} |
262 |
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int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size)
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{ |
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return kvm_dirty_pages_log_change(phys_addr, size,
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0,
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KVM_MEM_LOG_DIRTY_PAGES); |
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} |
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static int kvm_set_migration_log(int enable) |
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{ |
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KVMState *s = kvm_state; |
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KVMSlot *mem; |
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int i, err;
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s->migration_log = enable; |
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for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
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mem = &s->slots[i]; |
280 |
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if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {
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continue;
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} |
284 |
err = kvm_set_user_memory_region(s, mem); |
285 |
if (err) {
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return err;
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} |
288 |
} |
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return 0; |
290 |
} |
291 |
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static int test_le_bit(unsigned long nr, unsigned char *addr) |
293 |
{ |
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return (addr[nr >> 3] >> (nr & 7)) & 1; |
295 |
} |
296 |
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/**
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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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* @end_addr: end of logged region.
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*/
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static int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, |
306 |
target_phys_addr_t end_addr) |
307 |
{ |
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KVMState *s = kvm_state; |
309 |
unsigned long size, allocated_size = 0; |
310 |
target_phys_addr_t phys_addr; |
311 |
ram_addr_t addr; |
312 |
KVMDirtyLog d; |
313 |
KVMSlot *mem; |
314 |
int ret = 0; |
315 |
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d.dirty_bitmap = NULL;
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317 |
while (start_addr < end_addr) {
|
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mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr); |
319 |
if (mem == NULL) { |
320 |
break;
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} |
322 |
|
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size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8; |
324 |
if (!d.dirty_bitmap) {
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d.dirty_bitmap = qemu_malloc(size); |
326 |
} else if (size > allocated_size) { |
327 |
d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size); |
328 |
} |
329 |
allocated_size = size; |
330 |
memset(d.dirty_bitmap, 0, allocated_size);
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331 |
|
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d.slot = mem->slot; |
333 |
|
334 |
if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) { |
335 |
dprintf("ioctl failed %d\n", errno);
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ret = -1;
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break;
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} |
339 |
|
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for (phys_addr = mem->start_addr, addr = mem->phys_offset;
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phys_addr < mem->start_addr + mem->memory_size; |
342 |
phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) { |
343 |
unsigned char *bitmap = (unsigned char *)d.dirty_bitmap; |
344 |
unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS;
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|
346 |
if (test_le_bit(nr, bitmap)) {
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347 |
cpu_physical_memory_set_dirty(addr); |
348 |
} |
349 |
} |
350 |
start_addr = phys_addr; |
351 |
} |
352 |
qemu_free(d.dirty_bitmap); |
353 |
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return ret;
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} |
356 |
|
357 |
int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
|
358 |
{ |
359 |
int ret = -ENOSYS;
|
360 |
#ifdef KVM_CAP_COALESCED_MMIO
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361 |
KVMState *s = kvm_state; |
362 |
|
363 |
if (s->coalesced_mmio) {
|
364 |
struct kvm_coalesced_mmio_zone zone;
|
365 |
|
366 |
zone.addr = start; |
367 |
zone.size = size; |
368 |
|
369 |
ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); |
370 |
} |
371 |
#endif
|
372 |
|
373 |
return ret;
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374 |
} |
375 |
|
376 |
int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
|
377 |
{ |
378 |
int ret = -ENOSYS;
|
379 |
#ifdef KVM_CAP_COALESCED_MMIO
|
380 |
KVMState *s = kvm_state; |
381 |
|
382 |
if (s->coalesced_mmio) {
|
383 |
struct kvm_coalesced_mmio_zone zone;
|
384 |
|
385 |
zone.addr = start; |
386 |
zone.size = size; |
387 |
|
388 |
ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); |
389 |
} |
390 |
#endif
|
391 |
|
392 |
return ret;
|
393 |
} |
394 |
|
395 |
int kvm_check_extension(KVMState *s, unsigned int extension) |
396 |
{ |
397 |
int ret;
|
398 |
|
399 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension); |
400 |
if (ret < 0) { |
401 |
ret = 0;
|
402 |
} |
403 |
|
404 |
return ret;
|
405 |
} |
406 |
|
407 |
static void kvm_set_phys_mem(target_phys_addr_t start_addr, |
408 |
ram_addr_t size, |
409 |
ram_addr_t phys_offset) |
410 |
{ |
411 |
KVMState *s = kvm_state; |
412 |
ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; |
413 |
KVMSlot *mem, old; |
414 |
int err;
|
415 |
|
416 |
if (start_addr & ~TARGET_PAGE_MASK) {
|
417 |
if (flags >= IO_MEM_UNASSIGNED) {
|
418 |
if (!kvm_lookup_overlapping_slot(s, start_addr,
|
419 |
start_addr + size)) { |
420 |
return;
|
421 |
} |
422 |
fprintf(stderr, "Unaligned split of a KVM memory slot\n");
|
423 |
} else {
|
424 |
fprintf(stderr, "Only page-aligned memory slots supported\n");
|
425 |
} |
426 |
abort(); |
427 |
} |
428 |
|
429 |
/* KVM does not support read-only slots */
|
430 |
phys_offset &= ~IO_MEM_ROM; |
431 |
|
432 |
while (1) { |
433 |
mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size); |
434 |
if (!mem) {
|
435 |
break;
|
436 |
} |
437 |
|
438 |
if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr &&
|
439 |
(start_addr + size <= mem->start_addr + mem->memory_size) && |
440 |
(phys_offset - start_addr == mem->phys_offset - mem->start_addr)) { |
441 |
/* The new slot fits into the existing one and comes with
|
442 |
* identical parameters - nothing to be done. */
|
443 |
return;
|
444 |
} |
445 |
|
446 |
old = *mem; |
447 |
|
448 |
/* unregister the overlapping slot */
|
449 |
mem->memory_size = 0;
|
450 |
err = kvm_set_user_memory_region(s, mem); |
451 |
if (err) {
|
452 |
fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
|
453 |
__func__, strerror(-err)); |
454 |
abort(); |
455 |
} |
456 |
|
457 |
/* Workaround for older KVM versions: we can't join slots, even not by
|
458 |
* unregistering the previous ones and then registering the larger
|
459 |
* slot. We have to maintain the existing fragmentation. Sigh.
|
460 |
*
|
461 |
* This workaround assumes that the new slot starts at the same
|
462 |
* address as the first existing one. If not or if some overlapping
|
463 |
* slot comes around later, we will fail (not seen in practice so far)
|
464 |
* - and actually require a recent KVM version. */
|
465 |
if (s->broken_set_mem_region &&
|
466 |
old.start_addr == start_addr && old.memory_size < size && |
467 |
flags < IO_MEM_UNASSIGNED) { |
468 |
mem = kvm_alloc_slot(s); |
469 |
mem->memory_size = old.memory_size; |
470 |
mem->start_addr = old.start_addr; |
471 |
mem->phys_offset = old.phys_offset; |
472 |
mem->flags = 0;
|
473 |
|
474 |
err = kvm_set_user_memory_region(s, mem); |
475 |
if (err) {
|
476 |
fprintf(stderr, "%s: error updating slot: %s\n", __func__,
|
477 |
strerror(-err)); |
478 |
abort(); |
479 |
} |
480 |
|
481 |
start_addr += old.memory_size; |
482 |
phys_offset += old.memory_size; |
483 |
size -= old.memory_size; |
484 |
continue;
|
485 |
} |
486 |
|
487 |
/* register prefix slot */
|
488 |
if (old.start_addr < start_addr) {
|
489 |
mem = kvm_alloc_slot(s); |
490 |
mem->memory_size = start_addr - old.start_addr; |
491 |
mem->start_addr = old.start_addr; |
492 |
mem->phys_offset = old.phys_offset; |
493 |
mem->flags = 0;
|
494 |
|
495 |
err = kvm_set_user_memory_region(s, mem); |
496 |
if (err) {
|
497 |
fprintf(stderr, "%s: error registering prefix slot: %s\n",
|
498 |
__func__, strerror(-err)); |
499 |
abort(); |
500 |
} |
501 |
} |
502 |
|
503 |
/* register suffix slot */
|
504 |
if (old.start_addr + old.memory_size > start_addr + size) {
|
505 |
ram_addr_t size_delta; |
506 |
|
507 |
mem = kvm_alloc_slot(s); |
508 |
mem->start_addr = start_addr + size; |
509 |
size_delta = mem->start_addr - old.start_addr; |
510 |
mem->memory_size = old.memory_size - size_delta; |
511 |
mem->phys_offset = old.phys_offset + size_delta; |
512 |
mem->flags = 0;
|
513 |
|
514 |
err = kvm_set_user_memory_region(s, mem); |
515 |
if (err) {
|
516 |
fprintf(stderr, "%s: error registering suffix slot: %s\n",
|
517 |
__func__, strerror(-err)); |
518 |
abort(); |
519 |
} |
520 |
} |
521 |
} |
522 |
|
523 |
/* in case the KVM bug workaround already "consumed" the new slot */
|
524 |
if (!size)
|
525 |
return;
|
526 |
|
527 |
/* KVM does not need to know about this memory */
|
528 |
if (flags >= IO_MEM_UNASSIGNED)
|
529 |
return;
|
530 |
|
531 |
mem = kvm_alloc_slot(s); |
532 |
mem->memory_size = size; |
533 |
mem->start_addr = start_addr; |
534 |
mem->phys_offset = phys_offset; |
535 |
mem->flags = 0;
|
536 |
|
537 |
err = kvm_set_user_memory_region(s, mem); |
538 |
if (err) {
|
539 |
fprintf(stderr, "%s: error registering slot: %s\n", __func__,
|
540 |
strerror(-err)); |
541 |
abort(); |
542 |
} |
543 |
} |
544 |
|
545 |
static void kvm_client_set_memory(struct CPUPhysMemoryClient *client, |
546 |
target_phys_addr_t start_addr, |
547 |
ram_addr_t size, |
548 |
ram_addr_t phys_offset) |
549 |
{ |
550 |
kvm_set_phys_mem(start_addr, size, phys_offset); |
551 |
} |
552 |
|
553 |
static int kvm_client_sync_dirty_bitmap(struct CPUPhysMemoryClient *client, |
554 |
target_phys_addr_t start_addr, |
555 |
target_phys_addr_t end_addr) |
556 |
{ |
557 |
return kvm_physical_sync_dirty_bitmap(start_addr, end_addr);
|
558 |
} |
559 |
|
560 |
static int kvm_client_migration_log(struct CPUPhysMemoryClient *client, |
561 |
int enable)
|
562 |
{ |
563 |
return kvm_set_migration_log(enable);
|
564 |
} |
565 |
|
566 |
static CPUPhysMemoryClient kvm_cpu_phys_memory_client = {
|
567 |
.set_memory = kvm_client_set_memory, |
568 |
.sync_dirty_bitmap = kvm_client_sync_dirty_bitmap, |
569 |
.migration_log = kvm_client_migration_log, |
570 |
}; |
571 |
|
572 |
int kvm_init(int smp_cpus) |
573 |
{ |
574 |
static const char upgrade_note[] = |
575 |
"Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
|
576 |
"(see http://sourceforge.net/projects/kvm).\n";
|
577 |
KVMState *s; |
578 |
int ret;
|
579 |
int i;
|
580 |
|
581 |
if (smp_cpus > 1) { |
582 |
fprintf(stderr, "No SMP KVM support, use '-smp 1'\n");
|
583 |
return -EINVAL;
|
584 |
} |
585 |
|
586 |
s = qemu_mallocz(sizeof(KVMState));
|
587 |
|
588 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
589 |
QTAILQ_INIT(&s->kvm_sw_breakpoints); |
590 |
#endif
|
591 |
for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
592 |
s->slots[i].slot = i; |
593 |
|
594 |
s->vmfd = -1;
|
595 |
s->fd = qemu_open("/dev/kvm", O_RDWR);
|
596 |
if (s->fd == -1) { |
597 |
fprintf(stderr, "Could not access KVM kernel module: %m\n");
|
598 |
ret = -errno; |
599 |
goto err;
|
600 |
} |
601 |
|
602 |
ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
|
603 |
if (ret < KVM_API_VERSION) {
|
604 |
if (ret > 0) |
605 |
ret = -EINVAL; |
606 |
fprintf(stderr, "kvm version too old\n");
|
607 |
goto err;
|
608 |
} |
609 |
|
610 |
if (ret > KVM_API_VERSION) {
|
611 |
ret = -EINVAL; |
612 |
fprintf(stderr, "kvm version not supported\n");
|
613 |
goto err;
|
614 |
} |
615 |
|
616 |
s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
|
617 |
if (s->vmfd < 0) |
618 |
goto err;
|
619 |
|
620 |
/* initially, KVM allocated its own memory and we had to jump through
|
621 |
* hooks to make phys_ram_base point to this. Modern versions of KVM
|
622 |
* just use a user allocated buffer so we can use regular pages
|
623 |
* unmodified. Make sure we have a sufficiently modern version of KVM.
|
624 |
*/
|
625 |
if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) {
|
626 |
ret = -EINVAL; |
627 |
fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s",
|
628 |
upgrade_note); |
629 |
goto err;
|
630 |
} |
631 |
|
632 |
/* There was a nasty bug in < kvm-80 that prevents memory slots from being
|
633 |
* destroyed properly. Since we rely on this capability, refuse to work
|
634 |
* with any kernel without this capability. */
|
635 |
if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) {
|
636 |
ret = -EINVAL; |
637 |
|
638 |
fprintf(stderr, |
639 |
"KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s",
|
640 |
upgrade_note); |
641 |
goto err;
|
642 |
} |
643 |
|
644 |
s->coalesced_mmio = 0;
|
645 |
#ifdef KVM_CAP_COALESCED_MMIO
|
646 |
s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); |
647 |
s->coalesced_mmio_ring = NULL;
|
648 |
#endif
|
649 |
|
650 |
s->broken_set_mem_region = 1;
|
651 |
#ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
|
652 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS); |
653 |
if (ret > 0) { |
654 |
s->broken_set_mem_region = 0;
|
655 |
} |
656 |
#endif
|
657 |
|
658 |
s->vcpu_events = 0;
|
659 |
#ifdef KVM_CAP_VCPU_EVENTS
|
660 |
s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS); |
661 |
#endif
|
662 |
|
663 |
s->robust_singlestep = 0;
|
664 |
#ifdef KVM_CAP_X86_ROBUST_SINGLESTEP
|
665 |
s->robust_singlestep = |
666 |
kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP); |
667 |
#endif
|
668 |
|
669 |
ret = kvm_arch_init(s, smp_cpus); |
670 |
if (ret < 0) |
671 |
goto err;
|
672 |
|
673 |
kvm_state = s; |
674 |
cpu_register_phys_memory_client(&kvm_cpu_phys_memory_client); |
675 |
|
676 |
return 0; |
677 |
|
678 |
err:
|
679 |
if (s) {
|
680 |
if (s->vmfd != -1) |
681 |
close(s->vmfd); |
682 |
if (s->fd != -1) |
683 |
close(s->fd); |
684 |
} |
685 |
qemu_free(s); |
686 |
|
687 |
return ret;
|
688 |
} |
689 |
|
690 |
static int kvm_handle_io(uint16_t port, void *data, int direction, int size, |
691 |
uint32_t count) |
692 |
{ |
693 |
int i;
|
694 |
uint8_t *ptr = data; |
695 |
|
696 |
for (i = 0; i < count; i++) { |
697 |
if (direction == KVM_EXIT_IO_IN) {
|
698 |
switch (size) {
|
699 |
case 1: |
700 |
stb_p(ptr, cpu_inb(port)); |
701 |
break;
|
702 |
case 2: |
703 |
stw_p(ptr, cpu_inw(port)); |
704 |
break;
|
705 |
case 4: |
706 |
stl_p(ptr, cpu_inl(port)); |
707 |
break;
|
708 |
} |
709 |
} else {
|
710 |
switch (size) {
|
711 |
case 1: |
712 |
cpu_outb(port, ldub_p(ptr)); |
713 |
break;
|
714 |
case 2: |
715 |
cpu_outw(port, lduw_p(ptr)); |
716 |
break;
|
717 |
case 4: |
718 |
cpu_outl(port, ldl_p(ptr)); |
719 |
break;
|
720 |
} |
721 |
} |
722 |
|
723 |
ptr += size; |
724 |
} |
725 |
|
726 |
return 1; |
727 |
} |
728 |
|
729 |
void kvm_flush_coalesced_mmio_buffer(void) |
730 |
{ |
731 |
#ifdef KVM_CAP_COALESCED_MMIO
|
732 |
KVMState *s = kvm_state; |
733 |
if (s->coalesced_mmio_ring) {
|
734 |
struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;
|
735 |
while (ring->first != ring->last) {
|
736 |
struct kvm_coalesced_mmio *ent;
|
737 |
|
738 |
ent = &ring->coalesced_mmio[ring->first]; |
739 |
|
740 |
cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); |
741 |
smp_wmb(); |
742 |
ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
|
743 |
} |
744 |
} |
745 |
#endif
|
746 |
} |
747 |
|
748 |
void kvm_cpu_synchronize_state(CPUState *env)
|
749 |
{ |
750 |
if (!env->kvm_vcpu_dirty) {
|
751 |
kvm_arch_get_registers(env); |
752 |
env->kvm_vcpu_dirty = 1;
|
753 |
} |
754 |
} |
755 |
|
756 |
int kvm_cpu_exec(CPUState *env)
|
757 |
{ |
758 |
struct kvm_run *run = env->kvm_run;
|
759 |
int ret;
|
760 |
|
761 |
dprintf("kvm_cpu_exec()\n");
|
762 |
|
763 |
do {
|
764 |
#ifndef CONFIG_IOTHREAD
|
765 |
if (env->exit_request) {
|
766 |
dprintf("interrupt exit requested\n");
|
767 |
ret = 0;
|
768 |
break;
|
769 |
} |
770 |
#endif
|
771 |
|
772 |
if (env->kvm_vcpu_dirty) {
|
773 |
kvm_arch_put_registers(env); |
774 |
env->kvm_vcpu_dirty = 0;
|
775 |
} |
776 |
|
777 |
kvm_arch_pre_run(env, run); |
778 |
qemu_mutex_unlock_iothread(); |
779 |
ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
|
780 |
qemu_mutex_lock_iothread(); |
781 |
kvm_arch_post_run(env, run); |
782 |
|
783 |
if (ret == -EINTR || ret == -EAGAIN) {
|
784 |
cpu_exit(env); |
785 |
dprintf("io window exit\n");
|
786 |
ret = 0;
|
787 |
break;
|
788 |
} |
789 |
|
790 |
if (ret < 0) { |
791 |
dprintf("kvm run failed %s\n", strerror(-ret));
|
792 |
abort(); |
793 |
} |
794 |
|
795 |
kvm_flush_coalesced_mmio_buffer(); |
796 |
|
797 |
ret = 0; /* exit loop */ |
798 |
switch (run->exit_reason) {
|
799 |
case KVM_EXIT_IO:
|
800 |
dprintf("handle_io\n");
|
801 |
ret = kvm_handle_io(run->io.port, |
802 |
(uint8_t *)run + run->io.data_offset, |
803 |
run->io.direction, |
804 |
run->io.size, |
805 |
run->io.count); |
806 |
break;
|
807 |
case KVM_EXIT_MMIO:
|
808 |
dprintf("handle_mmio\n");
|
809 |
cpu_physical_memory_rw(run->mmio.phys_addr, |
810 |
run->mmio.data, |
811 |
run->mmio.len, |
812 |
run->mmio.is_write); |
813 |
ret = 1;
|
814 |
break;
|
815 |
case KVM_EXIT_IRQ_WINDOW_OPEN:
|
816 |
dprintf("irq_window_open\n");
|
817 |
break;
|
818 |
case KVM_EXIT_SHUTDOWN:
|
819 |
dprintf("shutdown\n");
|
820 |
qemu_system_reset_request(); |
821 |
ret = 1;
|
822 |
break;
|
823 |
case KVM_EXIT_UNKNOWN:
|
824 |
dprintf("kvm_exit_unknown\n");
|
825 |
break;
|
826 |
case KVM_EXIT_FAIL_ENTRY:
|
827 |
dprintf("kvm_exit_fail_entry\n");
|
828 |
break;
|
829 |
case KVM_EXIT_EXCEPTION:
|
830 |
dprintf("kvm_exit_exception\n");
|
831 |
break;
|
832 |
case KVM_EXIT_DEBUG:
|
833 |
dprintf("kvm_exit_debug\n");
|
834 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
835 |
if (kvm_arch_debug(&run->debug.arch)) {
|
836 |
gdb_set_stop_cpu(env); |
837 |
vm_stop(EXCP_DEBUG); |
838 |
env->exception_index = EXCP_DEBUG; |
839 |
return 0; |
840 |
} |
841 |
/* re-enter, this exception was guest-internal */
|
842 |
ret = 1;
|
843 |
#endif /* KVM_CAP_SET_GUEST_DEBUG */ |
844 |
break;
|
845 |
default:
|
846 |
dprintf("kvm_arch_handle_exit\n");
|
847 |
ret = kvm_arch_handle_exit(env, run); |
848 |
break;
|
849 |
} |
850 |
} while (ret > 0); |
851 |
|
852 |
if (env->exit_request) {
|
853 |
env->exit_request = 0;
|
854 |
env->exception_index = EXCP_INTERRUPT; |
855 |
} |
856 |
|
857 |
return ret;
|
858 |
} |
859 |
|
860 |
int kvm_ioctl(KVMState *s, int type, ...) |
861 |
{ |
862 |
int ret;
|
863 |
void *arg;
|
864 |
va_list ap; |
865 |
|
866 |
va_start(ap, type); |
867 |
arg = va_arg(ap, void *);
|
868 |
va_end(ap); |
869 |
|
870 |
ret = ioctl(s->fd, type, arg); |
871 |
if (ret == -1) |
872 |
ret = -errno; |
873 |
|
874 |
return ret;
|
875 |
} |
876 |
|
877 |
int kvm_vm_ioctl(KVMState *s, int type, ...) |
878 |
{ |
879 |
int ret;
|
880 |
void *arg;
|
881 |
va_list ap; |
882 |
|
883 |
va_start(ap, type); |
884 |
arg = va_arg(ap, void *);
|
885 |
va_end(ap); |
886 |
|
887 |
ret = ioctl(s->vmfd, type, arg); |
888 |
if (ret == -1) |
889 |
ret = -errno; |
890 |
|
891 |
return ret;
|
892 |
} |
893 |
|
894 |
int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
895 |
{ |
896 |
int ret;
|
897 |
void *arg;
|
898 |
va_list ap; |
899 |
|
900 |
va_start(ap, type); |
901 |
arg = va_arg(ap, void *);
|
902 |
va_end(ap); |
903 |
|
904 |
ret = ioctl(env->kvm_fd, type, arg); |
905 |
if (ret == -1) |
906 |
ret = -errno; |
907 |
|
908 |
return ret;
|
909 |
} |
910 |
|
911 |
int kvm_has_sync_mmu(void) |
912 |
{ |
913 |
#ifdef KVM_CAP_SYNC_MMU
|
914 |
KVMState *s = kvm_state; |
915 |
|
916 |
return kvm_check_extension(s, KVM_CAP_SYNC_MMU);
|
917 |
#else
|
918 |
return 0; |
919 |
#endif
|
920 |
} |
921 |
|
922 |
int kvm_has_vcpu_events(void) |
923 |
{ |
924 |
return kvm_state->vcpu_events;
|
925 |
} |
926 |
|
927 |
int kvm_has_robust_singlestep(void) |
928 |
{ |
929 |
return kvm_state->robust_singlestep;
|
930 |
} |
931 |
|
932 |
void kvm_setup_guest_memory(void *start, size_t size) |
933 |
{ |
934 |
if (!kvm_has_sync_mmu()) {
|
935 |
#ifdef MADV_DONTFORK
|
936 |
int ret = madvise(start, size, MADV_DONTFORK);
|
937 |
|
938 |
if (ret) {
|
939 |
perror("madvice");
|
940 |
exit(1);
|
941 |
} |
942 |
#else
|
943 |
fprintf(stderr, |
944 |
"Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
|
945 |
exit(1);
|
946 |
#endif
|
947 |
} |
948 |
} |
949 |
|
950 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
951 |
static void on_vcpu(CPUState *env, void (*func)(void *data), void *data) |
952 |
{ |
953 |
#ifdef CONFIG_IOTHREAD
|
954 |
if (env != cpu_single_env) {
|
955 |
abort(); |
956 |
} |
957 |
#endif
|
958 |
func(data); |
959 |
} |
960 |
|
961 |
struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env,
|
962 |
target_ulong pc) |
963 |
{ |
964 |
struct kvm_sw_breakpoint *bp;
|
965 |
|
966 |
QTAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) { |
967 |
if (bp->pc == pc)
|
968 |
return bp;
|
969 |
} |
970 |
return NULL; |
971 |
} |
972 |
|
973 |
int kvm_sw_breakpoints_active(CPUState *env)
|
974 |
{ |
975 |
return !QTAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
|
976 |
} |
977 |
|
978 |
struct kvm_set_guest_debug_data {
|
979 |
struct kvm_guest_debug dbg;
|
980 |
CPUState *env; |
981 |
int err;
|
982 |
}; |
983 |
|
984 |
static void kvm_invoke_set_guest_debug(void *data) |
985 |
{ |
986 |
struct kvm_set_guest_debug_data *dbg_data = data;
|
987 |
CPUState *env = dbg_data->env; |
988 |
|
989 |
dbg_data->err = kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg_data->dbg); |
990 |
} |
991 |
|
992 |
int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
993 |
{ |
994 |
struct kvm_set_guest_debug_data data;
|
995 |
|
996 |
data.dbg.control = reinject_trap; |
997 |
|
998 |
if (env->singlestep_enabled) {
|
999 |
data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; |
1000 |
} |
1001 |
kvm_arch_update_guest_debug(env, &data.dbg); |
1002 |
data.env = env; |
1003 |
|
1004 |
on_vcpu(env, kvm_invoke_set_guest_debug, &data); |
1005 |
return data.err;
|
1006 |
} |
1007 |
|
1008 |
int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
|
1009 |
target_ulong len, int type)
|
1010 |
{ |
1011 |
struct kvm_sw_breakpoint *bp;
|
1012 |
CPUState *env; |
1013 |
int err;
|
1014 |
|
1015 |
if (type == GDB_BREAKPOINT_SW) {
|
1016 |
bp = kvm_find_sw_breakpoint(current_env, addr); |
1017 |
if (bp) {
|
1018 |
bp->use_count++; |
1019 |
return 0; |
1020 |
} |
1021 |
|
1022 |
bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint)); |
1023 |
if (!bp)
|
1024 |
return -ENOMEM;
|
1025 |
|
1026 |
bp->pc = addr; |
1027 |
bp->use_count = 1;
|
1028 |
err = kvm_arch_insert_sw_breakpoint(current_env, bp); |
1029 |
if (err) {
|
1030 |
free(bp); |
1031 |
return err;
|
1032 |
} |
1033 |
|
1034 |
QTAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints, |
1035 |
bp, entry); |
1036 |
} else {
|
1037 |
err = kvm_arch_insert_hw_breakpoint(addr, len, type); |
1038 |
if (err)
|
1039 |
return err;
|
1040 |
} |
1041 |
|
1042 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1043 |
err = kvm_update_guest_debug(env, 0);
|
1044 |
if (err)
|
1045 |
return err;
|
1046 |
} |
1047 |
return 0; |
1048 |
} |
1049 |
|
1050 |
int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
|
1051 |
target_ulong len, int type)
|
1052 |
{ |
1053 |
struct kvm_sw_breakpoint *bp;
|
1054 |
CPUState *env; |
1055 |
int err;
|
1056 |
|
1057 |
if (type == GDB_BREAKPOINT_SW) {
|
1058 |
bp = kvm_find_sw_breakpoint(current_env, addr); |
1059 |
if (!bp)
|
1060 |
return -ENOENT;
|
1061 |
|
1062 |
if (bp->use_count > 1) { |
1063 |
bp->use_count--; |
1064 |
return 0; |
1065 |
} |
1066 |
|
1067 |
err = kvm_arch_remove_sw_breakpoint(current_env, bp); |
1068 |
if (err)
|
1069 |
return err;
|
1070 |
|
1071 |
QTAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry); |
1072 |
qemu_free(bp); |
1073 |
} else {
|
1074 |
err = kvm_arch_remove_hw_breakpoint(addr, len, type); |
1075 |
if (err)
|
1076 |
return err;
|
1077 |
} |
1078 |
|
1079 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1080 |
err = kvm_update_guest_debug(env, 0);
|
1081 |
if (err)
|
1082 |
return err;
|
1083 |
} |
1084 |
return 0; |
1085 |
} |
1086 |
|
1087 |
void kvm_remove_all_breakpoints(CPUState *current_env)
|
1088 |
{ |
1089 |
struct kvm_sw_breakpoint *bp, *next;
|
1090 |
KVMState *s = current_env->kvm_state; |
1091 |
CPUState *env; |
1092 |
|
1093 |
QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { |
1094 |
if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) { |
1095 |
/* Try harder to find a CPU that currently sees the breakpoint. */
|
1096 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1097 |
if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) |
1098 |
break;
|
1099 |
} |
1100 |
} |
1101 |
} |
1102 |
kvm_arch_remove_all_hw_breakpoints(); |
1103 |
|
1104 |
for (env = first_cpu; env != NULL; env = env->next_cpu) |
1105 |
kvm_update_guest_debug(env, 0);
|
1106 |
} |
1107 |
|
1108 |
#else /* !KVM_CAP_SET_GUEST_DEBUG */ |
1109 |
|
1110 |
int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
1111 |
{ |
1112 |
return -EINVAL;
|
1113 |
} |
1114 |
|
1115 |
int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
|
1116 |
target_ulong len, int type)
|
1117 |
{ |
1118 |
return -EINVAL;
|
1119 |
} |
1120 |
|
1121 |
int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
|
1122 |
target_ulong len, int type)
|
1123 |
{ |
1124 |
return -EINVAL;
|
1125 |
} |
1126 |
|
1127 |
void kvm_remove_all_breakpoints(CPUState *current_env)
|
1128 |
{ |
1129 |
} |
1130 |
#endif /* !KVM_CAP_SET_GUEST_DEBUG */ |
1131 |
|
1132 |
int kvm_set_signal_mask(CPUState *env, const sigset_t *sigset) |
1133 |
{ |
1134 |
struct kvm_signal_mask *sigmask;
|
1135 |
int r;
|
1136 |
|
1137 |
if (!sigset)
|
1138 |
return kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, NULL); |
1139 |
|
1140 |
sigmask = qemu_malloc(sizeof(*sigmask) + sizeof(*sigset)); |
1141 |
|
1142 |
sigmask->len = 8;
|
1143 |
memcpy(sigmask->sigset, sigset, sizeof(*sigset));
|
1144 |
r = kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, sigmask); |
1145 |
free(sigmask); |
1146 |
|
1147 |
return r;
|
1148 |
} |