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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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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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|
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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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|
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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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|
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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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} |
151 |
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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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} |
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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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} |
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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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} |
242 |
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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} |
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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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} |
262 |
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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]; |
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if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {
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continue;
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} |
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err = kvm_set_user_memory_region(s, mem); |
278 |
if (err) {
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return err;
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} |
281 |
} |
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return 0; |
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} |
284 |
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static int test_le_bit(unsigned long nr, unsigned char *addr) |
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{ |
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return (addr[nr >> 3] >> (nr & 7)) & 1; |
288 |
} |
289 |
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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, |
299 |
target_phys_addr_t end_addr) |
300 |
{ |
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KVMState *s = kvm_state; |
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unsigned long size, allocated_size = 0; |
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target_phys_addr_t phys_addr; |
304 |
ram_addr_t addr; |
305 |
KVMDirtyLog d; |
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KVMSlot *mem; |
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int ret = 0; |
308 |
|
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d.dirty_bitmap = NULL;
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310 |
while (start_addr < end_addr) {
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mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr); |
312 |
if (mem == NULL) { |
313 |
break;
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} |
315 |
|
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size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8; |
317 |
if (!d.dirty_bitmap) {
|
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d.dirty_bitmap = qemu_malloc(size); |
319 |
} else if (size > allocated_size) { |
320 |
d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size); |
321 |
} |
322 |
allocated_size = size; |
323 |
memset(d.dirty_bitmap, 0, allocated_size);
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d.slot = mem->slot; |
326 |
|
327 |
if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) { |
328 |
DPRINTF("ioctl failed %d\n", errno);
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329 |
ret = -1;
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330 |
break;
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331 |
} |
332 |
|
333 |
for (phys_addr = mem->start_addr, addr = mem->phys_offset;
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phys_addr < mem->start_addr + mem->memory_size; |
335 |
phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) { |
336 |
unsigned char *bitmap = (unsigned char *)d.dirty_bitmap; |
337 |
unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS;
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|
339 |
if (test_le_bit(nr, bitmap)) {
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cpu_physical_memory_set_dirty(addr); |
341 |
} |
342 |
} |
343 |
start_addr = phys_addr; |
344 |
} |
345 |
qemu_free(d.dirty_bitmap); |
346 |
|
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return ret;
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} |
349 |
|
350 |
int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
|
351 |
{ |
352 |
int ret = -ENOSYS;
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353 |
#ifdef KVM_CAP_COALESCED_MMIO
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354 |
KVMState *s = kvm_state; |
355 |
|
356 |
if (s->coalesced_mmio) {
|
357 |
struct kvm_coalesced_mmio_zone zone;
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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;
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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
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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_set_phys_mem(target_phys_addr_t start_addr, |
401 |
ram_addr_t size, |
402 |
ram_addr_t phys_offset) |
403 |
{ |
404 |
KVMState *s = kvm_state; |
405 |
ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; |
406 |
KVMSlot *mem, old; |
407 |
int err;
|
408 |
|
409 |
if (start_addr & ~TARGET_PAGE_MASK) {
|
410 |
if (flags >= IO_MEM_UNASSIGNED) {
|
411 |
if (!kvm_lookup_overlapping_slot(s, start_addr,
|
412 |
start_addr + size)) { |
413 |
return;
|
414 |
} |
415 |
fprintf(stderr, "Unaligned split of a KVM memory slot\n");
|
416 |
} else {
|
417 |
fprintf(stderr, "Only page-aligned memory slots supported\n");
|
418 |
} |
419 |
abort(); |
420 |
} |
421 |
|
422 |
/* KVM does not support read-only slots */
|
423 |
phys_offset &= ~IO_MEM_ROM; |
424 |
|
425 |
while (1) { |
426 |
mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size); |
427 |
if (!mem) {
|
428 |
break;
|
429 |
} |
430 |
|
431 |
if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr &&
|
432 |
(start_addr + size <= mem->start_addr + mem->memory_size) && |
433 |
(phys_offset - start_addr == mem->phys_offset - mem->start_addr)) { |
434 |
/* The new slot fits into the existing one and comes with
|
435 |
* identical parameters - nothing to be done. */
|
436 |
return;
|
437 |
} |
438 |
|
439 |
old = *mem; |
440 |
|
441 |
/* unregister the overlapping slot */
|
442 |
mem->memory_size = 0;
|
443 |
err = kvm_set_user_memory_region(s, mem); |
444 |
if (err) {
|
445 |
fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
|
446 |
__func__, strerror(-err)); |
447 |
abort(); |
448 |
} |
449 |
|
450 |
/* Workaround for older KVM versions: we can't join slots, even not by
|
451 |
* unregistering the previous ones and then registering the larger
|
452 |
* slot. We have to maintain the existing fragmentation. Sigh.
|
453 |
*
|
454 |
* This workaround assumes that the new slot starts at the same
|
455 |
* address as the first existing one. If not or if some overlapping
|
456 |
* slot comes around later, we will fail (not seen in practice so far)
|
457 |
* - and actually require a recent KVM version. */
|
458 |
if (s->broken_set_mem_region &&
|
459 |
old.start_addr == start_addr && old.memory_size < size && |
460 |
flags < IO_MEM_UNASSIGNED) { |
461 |
mem = kvm_alloc_slot(s); |
462 |
mem->memory_size = old.memory_size; |
463 |
mem->start_addr = old.start_addr; |
464 |
mem->phys_offset = old.phys_offset; |
465 |
mem->flags = 0;
|
466 |
|
467 |
err = kvm_set_user_memory_region(s, mem); |
468 |
if (err) {
|
469 |
fprintf(stderr, "%s: error updating slot: %s\n", __func__,
|
470 |
strerror(-err)); |
471 |
abort(); |
472 |
} |
473 |
|
474 |
start_addr += old.memory_size; |
475 |
phys_offset += old.memory_size; |
476 |
size -= old.memory_size; |
477 |
continue;
|
478 |
} |
479 |
|
480 |
/* register prefix slot */
|
481 |
if (old.start_addr < start_addr) {
|
482 |
mem = kvm_alloc_slot(s); |
483 |
mem->memory_size = start_addr - old.start_addr; |
484 |
mem->start_addr = old.start_addr; |
485 |
mem->phys_offset = old.phys_offset; |
486 |
mem->flags = 0;
|
487 |
|
488 |
err = kvm_set_user_memory_region(s, mem); |
489 |
if (err) {
|
490 |
fprintf(stderr, "%s: error registering prefix slot: %s\n",
|
491 |
__func__, strerror(-err)); |
492 |
abort(); |
493 |
} |
494 |
} |
495 |
|
496 |
/* register suffix slot */
|
497 |
if (old.start_addr + old.memory_size > start_addr + size) {
|
498 |
ram_addr_t size_delta; |
499 |
|
500 |
mem = kvm_alloc_slot(s); |
501 |
mem->start_addr = start_addr + size; |
502 |
size_delta = mem->start_addr - old.start_addr; |
503 |
mem->memory_size = old.memory_size - size_delta; |
504 |
mem->phys_offset = old.phys_offset + size_delta; |
505 |
mem->flags = 0;
|
506 |
|
507 |
err = kvm_set_user_memory_region(s, mem); |
508 |
if (err) {
|
509 |
fprintf(stderr, "%s: error registering suffix slot: %s\n",
|
510 |
__func__, strerror(-err)); |
511 |
abort(); |
512 |
} |
513 |
} |
514 |
} |
515 |
|
516 |
/* in case the KVM bug workaround already "consumed" the new slot */
|
517 |
if (!size)
|
518 |
return;
|
519 |
|
520 |
/* KVM does not need to know about this memory */
|
521 |
if (flags >= IO_MEM_UNASSIGNED)
|
522 |
return;
|
523 |
|
524 |
mem = kvm_alloc_slot(s); |
525 |
mem->memory_size = size; |
526 |
mem->start_addr = start_addr; |
527 |
mem->phys_offset = phys_offset; |
528 |
mem->flags = 0;
|
529 |
|
530 |
err = kvm_set_user_memory_region(s, mem); |
531 |
if (err) {
|
532 |
fprintf(stderr, "%s: error registering slot: %s\n", __func__,
|
533 |
strerror(-err)); |
534 |
abort(); |
535 |
} |
536 |
} |
537 |
|
538 |
static void kvm_client_set_memory(struct CPUPhysMemoryClient *client, |
539 |
target_phys_addr_t start_addr, |
540 |
ram_addr_t size, |
541 |
ram_addr_t phys_offset) |
542 |
{ |
543 |
kvm_set_phys_mem(start_addr, size, phys_offset); |
544 |
} |
545 |
|
546 |
static int kvm_client_sync_dirty_bitmap(struct CPUPhysMemoryClient *client, |
547 |
target_phys_addr_t start_addr, |
548 |
target_phys_addr_t end_addr) |
549 |
{ |
550 |
return kvm_physical_sync_dirty_bitmap(start_addr, end_addr);
|
551 |
} |
552 |
|
553 |
static int kvm_client_migration_log(struct CPUPhysMemoryClient *client, |
554 |
int enable)
|
555 |
{ |
556 |
return kvm_set_migration_log(enable);
|
557 |
} |
558 |
|
559 |
static CPUPhysMemoryClient kvm_cpu_phys_memory_client = {
|
560 |
.set_memory = kvm_client_set_memory, |
561 |
.sync_dirty_bitmap = kvm_client_sync_dirty_bitmap, |
562 |
.migration_log = kvm_client_migration_log, |
563 |
}; |
564 |
|
565 |
int kvm_init(int smp_cpus) |
566 |
{ |
567 |
static const char upgrade_note[] = |
568 |
"Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
|
569 |
"(see http://sourceforge.net/projects/kvm).\n";
|
570 |
KVMState *s; |
571 |
int ret;
|
572 |
int i;
|
573 |
|
574 |
if (smp_cpus > 1) { |
575 |
fprintf(stderr, "No SMP KVM support, use '-smp 1'\n");
|
576 |
return -EINVAL;
|
577 |
} |
578 |
|
579 |
s = qemu_mallocz(sizeof(KVMState));
|
580 |
|
581 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
582 |
QTAILQ_INIT(&s->kvm_sw_breakpoints); |
583 |
#endif
|
584 |
for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
585 |
s->slots[i].slot = i; |
586 |
|
587 |
s->vmfd = -1;
|
588 |
s->fd = qemu_open("/dev/kvm", O_RDWR);
|
589 |
if (s->fd == -1) { |
590 |
fprintf(stderr, "Could not access KVM kernel module: %m\n");
|
591 |
ret = -errno; |
592 |
goto err;
|
593 |
} |
594 |
|
595 |
ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
|
596 |
if (ret < KVM_API_VERSION) {
|
597 |
if (ret > 0) |
598 |
ret = -EINVAL; |
599 |
fprintf(stderr, "kvm version too old\n");
|
600 |
goto err;
|
601 |
} |
602 |
|
603 |
if (ret > KVM_API_VERSION) {
|
604 |
ret = -EINVAL; |
605 |
fprintf(stderr, "kvm version not supported\n");
|
606 |
goto err;
|
607 |
} |
608 |
|
609 |
s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
|
610 |
if (s->vmfd < 0) { |
611 |
#ifdef TARGET_S390X
|
612 |
fprintf(stderr, "Please add the 'switch_amode' kernel parameter to "
|
613 |
"your host kernel command line\n");
|
614 |
#endif
|
615 |
goto err;
|
616 |
} |
617 |
|
618 |
/* initially, KVM allocated its own memory and we had to jump through
|
619 |
* hooks to make phys_ram_base point to this. Modern versions of KVM
|
620 |
* just use a user allocated buffer so we can use regular pages
|
621 |
* unmodified. Make sure we have a sufficiently modern version of KVM.
|
622 |
*/
|
623 |
if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) {
|
624 |
ret = -EINVAL; |
625 |
fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s",
|
626 |
upgrade_note); |
627 |
goto err;
|
628 |
} |
629 |
|
630 |
/* There was a nasty bug in < kvm-80 that prevents memory slots from being
|
631 |
* destroyed properly. Since we rely on this capability, refuse to work
|
632 |
* with any kernel without this capability. */
|
633 |
if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) {
|
634 |
ret = -EINVAL; |
635 |
|
636 |
fprintf(stderr, |
637 |
"KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s",
|
638 |
upgrade_note); |
639 |
goto err;
|
640 |
} |
641 |
|
642 |
s->coalesced_mmio = 0;
|
643 |
#ifdef KVM_CAP_COALESCED_MMIO
|
644 |
s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); |
645 |
s->coalesced_mmio_ring = NULL;
|
646 |
#endif
|
647 |
|
648 |
s->broken_set_mem_region = 1;
|
649 |
#ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
|
650 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS); |
651 |
if (ret > 0) { |
652 |
s->broken_set_mem_region = 0;
|
653 |
} |
654 |
#endif
|
655 |
|
656 |
s->vcpu_events = 0;
|
657 |
#ifdef KVM_CAP_VCPU_EVENTS
|
658 |
s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS); |
659 |
#endif
|
660 |
|
661 |
s->robust_singlestep = 0;
|
662 |
#ifdef KVM_CAP_X86_ROBUST_SINGLESTEP
|
663 |
s->robust_singlestep = |
664 |
kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP); |
665 |
#endif
|
666 |
|
667 |
ret = kvm_arch_init(s, smp_cpus); |
668 |
if (ret < 0) |
669 |
goto err;
|
670 |
|
671 |
kvm_state = s; |
672 |
cpu_register_phys_memory_client(&kvm_cpu_phys_memory_client); |
673 |
|
674 |
return 0; |
675 |
|
676 |
err:
|
677 |
if (s) {
|
678 |
if (s->vmfd != -1) |
679 |
close(s->vmfd); |
680 |
if (s->fd != -1) |
681 |
close(s->fd); |
682 |
} |
683 |
qemu_free(s); |
684 |
|
685 |
return ret;
|
686 |
} |
687 |
|
688 |
static int kvm_handle_io(uint16_t port, void *data, int direction, int size, |
689 |
uint32_t count) |
690 |
{ |
691 |
int i;
|
692 |
uint8_t *ptr = data; |
693 |
|
694 |
for (i = 0; i < count; i++) { |
695 |
if (direction == KVM_EXIT_IO_IN) {
|
696 |
switch (size) {
|
697 |
case 1: |
698 |
stb_p(ptr, cpu_inb(port)); |
699 |
break;
|
700 |
case 2: |
701 |
stw_p(ptr, cpu_inw(port)); |
702 |
break;
|
703 |
case 4: |
704 |
stl_p(ptr, cpu_inl(port)); |
705 |
break;
|
706 |
} |
707 |
} else {
|
708 |
switch (size) {
|
709 |
case 1: |
710 |
cpu_outb(port, ldub_p(ptr)); |
711 |
break;
|
712 |
case 2: |
713 |
cpu_outw(port, lduw_p(ptr)); |
714 |
break;
|
715 |
case 4: |
716 |
cpu_outl(port, ldl_p(ptr)); |
717 |
break;
|
718 |
} |
719 |
} |
720 |
|
721 |
ptr += size; |
722 |
} |
723 |
|
724 |
return 1; |
725 |
} |
726 |
|
727 |
void kvm_flush_coalesced_mmio_buffer(void) |
728 |
{ |
729 |
#ifdef KVM_CAP_COALESCED_MMIO
|
730 |
KVMState *s = kvm_state; |
731 |
if (s->coalesced_mmio_ring) {
|
732 |
struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;
|
733 |
while (ring->first != ring->last) {
|
734 |
struct kvm_coalesced_mmio *ent;
|
735 |
|
736 |
ent = &ring->coalesced_mmio[ring->first]; |
737 |
|
738 |
cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); |
739 |
smp_wmb(); |
740 |
ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
|
741 |
} |
742 |
} |
743 |
#endif
|
744 |
} |
745 |
|
746 |
void kvm_cpu_synchronize_state(CPUState *env)
|
747 |
{ |
748 |
if (!env->kvm_vcpu_dirty) {
|
749 |
kvm_arch_get_registers(env); |
750 |
env->kvm_vcpu_dirty = 1;
|
751 |
} |
752 |
} |
753 |
|
754 |
void kvm_cpu_synchronize_post_reset(CPUState *env)
|
755 |
{ |
756 |
kvm_arch_put_registers(env, KVM_PUT_RESET_STATE); |
757 |
env->kvm_vcpu_dirty = 0;
|
758 |
} |
759 |
|
760 |
void kvm_cpu_synchronize_post_init(CPUState *env)
|
761 |
{ |
762 |
kvm_arch_put_registers(env, KVM_PUT_FULL_STATE); |
763 |
env->kvm_vcpu_dirty = 0;
|
764 |
} |
765 |
|
766 |
int kvm_cpu_exec(CPUState *env)
|
767 |
{ |
768 |
struct kvm_run *run = env->kvm_run;
|
769 |
int ret;
|
770 |
|
771 |
DPRINTF("kvm_cpu_exec()\n");
|
772 |
|
773 |
do {
|
774 |
#ifndef CONFIG_IOTHREAD
|
775 |
if (env->exit_request) {
|
776 |
DPRINTF("interrupt exit requested\n");
|
777 |
ret = 0;
|
778 |
break;
|
779 |
} |
780 |
#endif
|
781 |
|
782 |
if (env->kvm_vcpu_dirty) {
|
783 |
kvm_arch_put_registers(env, KVM_PUT_RUNTIME_STATE); |
784 |
env->kvm_vcpu_dirty = 0;
|
785 |
} |
786 |
|
787 |
kvm_arch_pre_run(env, run); |
788 |
qemu_mutex_unlock_iothread(); |
789 |
ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
|
790 |
qemu_mutex_lock_iothread(); |
791 |
kvm_arch_post_run(env, run); |
792 |
|
793 |
if (ret == -EINTR || ret == -EAGAIN) {
|
794 |
cpu_exit(env); |
795 |
DPRINTF("io window exit\n");
|
796 |
ret = 0;
|
797 |
break;
|
798 |
} |
799 |
|
800 |
if (ret < 0) { |
801 |
DPRINTF("kvm run failed %s\n", strerror(-ret));
|
802 |
abort(); |
803 |
} |
804 |
|
805 |
kvm_flush_coalesced_mmio_buffer(); |
806 |
|
807 |
ret = 0; /* exit loop */ |
808 |
switch (run->exit_reason) {
|
809 |
case KVM_EXIT_IO:
|
810 |
DPRINTF("handle_io\n");
|
811 |
ret = kvm_handle_io(run->io.port, |
812 |
(uint8_t *)run + run->io.data_offset, |
813 |
run->io.direction, |
814 |
run->io.size, |
815 |
run->io.count); |
816 |
break;
|
817 |
case KVM_EXIT_MMIO:
|
818 |
DPRINTF("handle_mmio\n");
|
819 |
cpu_physical_memory_rw(run->mmio.phys_addr, |
820 |
run->mmio.data, |
821 |
run->mmio.len, |
822 |
run->mmio.is_write); |
823 |
ret = 1;
|
824 |
break;
|
825 |
case KVM_EXIT_IRQ_WINDOW_OPEN:
|
826 |
DPRINTF("irq_window_open\n");
|
827 |
break;
|
828 |
case KVM_EXIT_SHUTDOWN:
|
829 |
DPRINTF("shutdown\n");
|
830 |
qemu_system_reset_request(); |
831 |
ret = 1;
|
832 |
break;
|
833 |
case KVM_EXIT_UNKNOWN:
|
834 |
DPRINTF("kvm_exit_unknown\n");
|
835 |
break;
|
836 |
case KVM_EXIT_FAIL_ENTRY:
|
837 |
DPRINTF("kvm_exit_fail_entry\n");
|
838 |
break;
|
839 |
case KVM_EXIT_EXCEPTION:
|
840 |
DPRINTF("kvm_exit_exception\n");
|
841 |
break;
|
842 |
case KVM_EXIT_DEBUG:
|
843 |
DPRINTF("kvm_exit_debug\n");
|
844 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
845 |
if (kvm_arch_debug(&run->debug.arch)) {
|
846 |
gdb_set_stop_cpu(env); |
847 |
vm_stop(EXCP_DEBUG); |
848 |
env->exception_index = EXCP_DEBUG; |
849 |
return 0; |
850 |
} |
851 |
/* re-enter, this exception was guest-internal */
|
852 |
ret = 1;
|
853 |
#endif /* KVM_CAP_SET_GUEST_DEBUG */ |
854 |
break;
|
855 |
default:
|
856 |
DPRINTF("kvm_arch_handle_exit\n");
|
857 |
ret = kvm_arch_handle_exit(env, run); |
858 |
break;
|
859 |
} |
860 |
} while (ret > 0); |
861 |
|
862 |
if (env->exit_request) {
|
863 |
env->exit_request = 0;
|
864 |
env->exception_index = EXCP_INTERRUPT; |
865 |
} |
866 |
|
867 |
return ret;
|
868 |
} |
869 |
|
870 |
int kvm_ioctl(KVMState *s, int type, ...) |
871 |
{ |
872 |
int ret;
|
873 |
void *arg;
|
874 |
va_list ap; |
875 |
|
876 |
va_start(ap, type); |
877 |
arg = va_arg(ap, void *);
|
878 |
va_end(ap); |
879 |
|
880 |
ret = ioctl(s->fd, type, arg); |
881 |
if (ret == -1) |
882 |
ret = -errno; |
883 |
|
884 |
return ret;
|
885 |
} |
886 |
|
887 |
int kvm_vm_ioctl(KVMState *s, int type, ...) |
888 |
{ |
889 |
int ret;
|
890 |
void *arg;
|
891 |
va_list ap; |
892 |
|
893 |
va_start(ap, type); |
894 |
arg = va_arg(ap, void *);
|
895 |
va_end(ap); |
896 |
|
897 |
ret = ioctl(s->vmfd, type, arg); |
898 |
if (ret == -1) |
899 |
ret = -errno; |
900 |
|
901 |
return ret;
|
902 |
} |
903 |
|
904 |
int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
905 |
{ |
906 |
int ret;
|
907 |
void *arg;
|
908 |
va_list ap; |
909 |
|
910 |
va_start(ap, type); |
911 |
arg = va_arg(ap, void *);
|
912 |
va_end(ap); |
913 |
|
914 |
ret = ioctl(env->kvm_fd, type, arg); |
915 |
if (ret == -1) |
916 |
ret = -errno; |
917 |
|
918 |
return ret;
|
919 |
} |
920 |
|
921 |
int kvm_has_sync_mmu(void) |
922 |
{ |
923 |
#ifdef KVM_CAP_SYNC_MMU
|
924 |
KVMState *s = kvm_state; |
925 |
|
926 |
return kvm_check_extension(s, KVM_CAP_SYNC_MMU);
|
927 |
#else
|
928 |
return 0; |
929 |
#endif
|
930 |
} |
931 |
|
932 |
int kvm_has_vcpu_events(void) |
933 |
{ |
934 |
return kvm_state->vcpu_events;
|
935 |
} |
936 |
|
937 |
int kvm_has_robust_singlestep(void) |
938 |
{ |
939 |
return kvm_state->robust_singlestep;
|
940 |
} |
941 |
|
942 |
void kvm_setup_guest_memory(void *start, size_t size) |
943 |
{ |
944 |
if (!kvm_has_sync_mmu()) {
|
945 |
#ifdef MADV_DONTFORK
|
946 |
int ret = madvise(start, size, MADV_DONTFORK);
|
947 |
|
948 |
if (ret) {
|
949 |
perror("madvice");
|
950 |
exit(1);
|
951 |
} |
952 |
#else
|
953 |
fprintf(stderr, |
954 |
"Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
|
955 |
exit(1);
|
956 |
#endif
|
957 |
} |
958 |
} |
959 |
|
960 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
961 |
static void on_vcpu(CPUState *env, void (*func)(void *data), void *data) |
962 |
{ |
963 |
#ifdef CONFIG_IOTHREAD
|
964 |
if (env != cpu_single_env) {
|
965 |
abort(); |
966 |
} |
967 |
#endif
|
968 |
func(data); |
969 |
} |
970 |
|
971 |
struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env,
|
972 |
target_ulong pc) |
973 |
{ |
974 |
struct kvm_sw_breakpoint *bp;
|
975 |
|
976 |
QTAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) { |
977 |
if (bp->pc == pc)
|
978 |
return bp;
|
979 |
} |
980 |
return NULL; |
981 |
} |
982 |
|
983 |
int kvm_sw_breakpoints_active(CPUState *env)
|
984 |
{ |
985 |
return !QTAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
|
986 |
} |
987 |
|
988 |
struct kvm_set_guest_debug_data {
|
989 |
struct kvm_guest_debug dbg;
|
990 |
CPUState *env; |
991 |
int err;
|
992 |
}; |
993 |
|
994 |
static void kvm_invoke_set_guest_debug(void *data) |
995 |
{ |
996 |
struct kvm_set_guest_debug_data *dbg_data = data;
|
997 |
CPUState *env = dbg_data->env; |
998 |
|
999 |
dbg_data->err = kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg_data->dbg); |
1000 |
} |
1001 |
|
1002 |
int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
1003 |
{ |
1004 |
struct kvm_set_guest_debug_data data;
|
1005 |
|
1006 |
data.dbg.control = reinject_trap; |
1007 |
|
1008 |
if (env->singlestep_enabled) {
|
1009 |
data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; |
1010 |
} |
1011 |
kvm_arch_update_guest_debug(env, &data.dbg); |
1012 |
data.env = env; |
1013 |
|
1014 |
on_vcpu(env, kvm_invoke_set_guest_debug, &data); |
1015 |
return data.err;
|
1016 |
} |
1017 |
|
1018 |
int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
|
1019 |
target_ulong len, int type)
|
1020 |
{ |
1021 |
struct kvm_sw_breakpoint *bp;
|
1022 |
CPUState *env; |
1023 |
int err;
|
1024 |
|
1025 |
if (type == GDB_BREAKPOINT_SW) {
|
1026 |
bp = kvm_find_sw_breakpoint(current_env, addr); |
1027 |
if (bp) {
|
1028 |
bp->use_count++; |
1029 |
return 0; |
1030 |
} |
1031 |
|
1032 |
bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint)); |
1033 |
if (!bp)
|
1034 |
return -ENOMEM;
|
1035 |
|
1036 |
bp->pc = addr; |
1037 |
bp->use_count = 1;
|
1038 |
err = kvm_arch_insert_sw_breakpoint(current_env, bp); |
1039 |
if (err) {
|
1040 |
free(bp); |
1041 |
return err;
|
1042 |
} |
1043 |
|
1044 |
QTAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints, |
1045 |
bp, entry); |
1046 |
} else {
|
1047 |
err = kvm_arch_insert_hw_breakpoint(addr, len, type); |
1048 |
if (err)
|
1049 |
return err;
|
1050 |
} |
1051 |
|
1052 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1053 |
err = kvm_update_guest_debug(env, 0);
|
1054 |
if (err)
|
1055 |
return err;
|
1056 |
} |
1057 |
return 0; |
1058 |
} |
1059 |
|
1060 |
int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
|
1061 |
target_ulong len, int type)
|
1062 |
{ |
1063 |
struct kvm_sw_breakpoint *bp;
|
1064 |
CPUState *env; |
1065 |
int err;
|
1066 |
|
1067 |
if (type == GDB_BREAKPOINT_SW) {
|
1068 |
bp = kvm_find_sw_breakpoint(current_env, addr); |
1069 |
if (!bp)
|
1070 |
return -ENOENT;
|
1071 |
|
1072 |
if (bp->use_count > 1) { |
1073 |
bp->use_count--; |
1074 |
return 0; |
1075 |
} |
1076 |
|
1077 |
err = kvm_arch_remove_sw_breakpoint(current_env, bp); |
1078 |
if (err)
|
1079 |
return err;
|
1080 |
|
1081 |
QTAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry); |
1082 |
qemu_free(bp); |
1083 |
} else {
|
1084 |
err = kvm_arch_remove_hw_breakpoint(addr, len, type); |
1085 |
if (err)
|
1086 |
return err;
|
1087 |
} |
1088 |
|
1089 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1090 |
err = kvm_update_guest_debug(env, 0);
|
1091 |
if (err)
|
1092 |
return err;
|
1093 |
} |
1094 |
return 0; |
1095 |
} |
1096 |
|
1097 |
void kvm_remove_all_breakpoints(CPUState *current_env)
|
1098 |
{ |
1099 |
struct kvm_sw_breakpoint *bp, *next;
|
1100 |
KVMState *s = current_env->kvm_state; |
1101 |
CPUState *env; |
1102 |
|
1103 |
QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { |
1104 |
if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) { |
1105 |
/* Try harder to find a CPU that currently sees the breakpoint. */
|
1106 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1107 |
if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) |
1108 |
break;
|
1109 |
} |
1110 |
} |
1111 |
} |
1112 |
kvm_arch_remove_all_hw_breakpoints(); |
1113 |
|
1114 |
for (env = first_cpu; env != NULL; env = env->next_cpu) |
1115 |
kvm_update_guest_debug(env, 0);
|
1116 |
} |
1117 |
|
1118 |
#else /* !KVM_CAP_SET_GUEST_DEBUG */ |
1119 |
|
1120 |
int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
1121 |
{ |
1122 |
return -EINVAL;
|
1123 |
} |
1124 |
|
1125 |
int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
|
1126 |
target_ulong len, int type)
|
1127 |
{ |
1128 |
return -EINVAL;
|
1129 |
} |
1130 |
|
1131 |
int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
|
1132 |
target_ulong len, int type)
|
1133 |
{ |
1134 |
return -EINVAL;
|
1135 |
} |
1136 |
|
1137 |
void kvm_remove_all_breakpoints(CPUState *current_env)
|
1138 |
{ |
1139 |
} |
1140 |
#endif /* !KVM_CAP_SET_GUEST_DEBUG */ |
1141 |
|
1142 |
int kvm_set_signal_mask(CPUState *env, const sigset_t *sigset) |
1143 |
{ |
1144 |
struct kvm_signal_mask *sigmask;
|
1145 |
int r;
|
1146 |
|
1147 |
if (!sigset)
|
1148 |
return kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, NULL); |
1149 |
|
1150 |
sigmask = qemu_malloc(sizeof(*sigmask) + sizeof(*sigset)); |
1151 |
|
1152 |
sigmask->len = 8;
|
1153 |
memcpy(sigmask->sigset, sigset, sizeof(*sigset));
|
1154 |
r = kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, sigmask); |
1155 |
free(sigmask); |
1156 |
|
1157 |
return r;
|
1158 |
} |
1159 |
|
1160 |
#ifdef KVM_IOEVENTFD
|
1161 |
int kvm_set_ioeventfd_pio_word(int fd, uint16_t addr, uint16_t val, bool assign) |
1162 |
{ |
1163 |
struct kvm_ioeventfd kick = {
|
1164 |
.datamatch = val, |
1165 |
.addr = addr, |
1166 |
.len = 2,
|
1167 |
.flags = KVM_IOEVENTFD_FLAG_DATAMATCH | KVM_IOEVENTFD_FLAG_PIO, |
1168 |
.fd = fd, |
1169 |
}; |
1170 |
int r;
|
1171 |
if (!kvm_enabled())
|
1172 |
return -ENOSYS;
|
1173 |
if (!assign)
|
1174 |
kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN; |
1175 |
r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick); |
1176 |
if (r < 0) |
1177 |
return r;
|
1178 |
return 0; |
1179 |
} |
1180 |
#endif
|