It is not possible to use virtio-ioeventfd when building without an I/O thread. We rely on a signal to kick us out of vcpu execution. Timers and AIO use SIGALRM and SIGUSR2 respectively. Unfortunately eventfd does not support O_ASYNC (SIGIO) so eventfd cannot be used in a signal driven manner. Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
1361 lines
34 KiB
C
1361 lines
34 KiB
C
/*
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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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#include "bswap.h"
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/* This check must be after config-host.h is included */
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#ifdef CONFIG_EVENTFD
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#include <sys/eventfd.h>
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#endif
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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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int debugregs;
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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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int xsave, xcrs;
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int many_ioeventfds;
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};
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static KVMState *kvm_state;
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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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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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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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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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int kvm_physical_memory_addr_from_ram(KVMState *s, ram_addr_t ram_addr,
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target_phys_addr_t *phys_addr)
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{
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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 (ram_addr >= mem->phys_offset &&
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ram_addr < mem->phys_offset + mem->memory_size) {
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*phys_addr = mem->start_addr + (ram_addr - mem->phys_offset);
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return 1;
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}
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}
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return 0;
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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_safe_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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}
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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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}
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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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}
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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];
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if (!mem->memory_size) {
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continue;
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}
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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);
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if (err) {
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return err;
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}
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}
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return 0;
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}
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/* get kvm's dirty pages bitmap and update qemu's */
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static int kvm_get_dirty_pages_log_range(unsigned long start_addr,
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unsigned long *bitmap,
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unsigned long offset,
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unsigned long mem_size)
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{
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unsigned int i, j;
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unsigned long page_number, addr, addr1, c;
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ram_addr_t ram_addr;
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unsigned int len = ((mem_size / TARGET_PAGE_SIZE) + HOST_LONG_BITS - 1) /
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HOST_LONG_BITS;
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/*
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* bitmap-traveling is faster than memory-traveling (for addr...)
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* especially when most of the memory is not dirty.
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*/
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for (i = 0; i < len; i++) {
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if (bitmap[i] != 0) {
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c = leul_to_cpu(bitmap[i]);
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do {
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j = ffsl(c) - 1;
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c &= ~(1ul << j);
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page_number = i * HOST_LONG_BITS + j;
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addr1 = page_number * TARGET_PAGE_SIZE;
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addr = offset + addr1;
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ram_addr = cpu_get_physical_page_desc(addr);
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cpu_physical_memory_set_dirty(ram_addr);
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} while (c != 0);
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}
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}
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return 0;
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}
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#define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
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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,
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target_phys_addr_t end_addr)
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{
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KVMState *s = kvm_state;
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unsigned long size, allocated_size = 0;
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KVMDirtyLog d;
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KVMSlot *mem;
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int ret = 0;
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d.dirty_bitmap = NULL;
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while (start_addr < end_addr) {
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mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr);
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if (mem == NULL) {
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break;
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}
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size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS), HOST_LONG_BITS) / 8;
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if (!d.dirty_bitmap) {
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d.dirty_bitmap = qemu_malloc(size);
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} else if (size > allocated_size) {
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d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size);
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}
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allocated_size = size;
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memset(d.dirty_bitmap, 0, allocated_size);
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d.slot = mem->slot;
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if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
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DPRINTF("ioctl failed %d\n", errno);
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ret = -1;
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break;
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}
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kvm_get_dirty_pages_log_range(mem->start_addr, d.dirty_bitmap,
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mem->start_addr, mem->memory_size);
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start_addr = mem->start_addr + mem->memory_size;
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}
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qemu_free(d.dirty_bitmap);
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return ret;
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}
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int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
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{
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int ret = -ENOSYS;
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#ifdef KVM_CAP_COALESCED_MMIO
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KVMState *s = kvm_state;
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if (s->coalesced_mmio) {
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struct kvm_coalesced_mmio_zone zone;
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zone.addr = start;
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zone.size = size;
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ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
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}
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#endif
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return ret;
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}
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int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
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{
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int ret = -ENOSYS;
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#ifdef KVM_CAP_COALESCED_MMIO
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KVMState *s = kvm_state;
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|
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if (s->coalesced_mmio) {
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struct kvm_coalesced_mmio_zone zone;
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zone.addr = start;
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zone.size = size;
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ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
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}
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#endif
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|
|
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return ret;
|
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}
|
|
|
|
int kvm_check_extension(KVMState *s, unsigned int extension)
|
|
{
|
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int ret;
|
|
|
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ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension);
|
|
if (ret < 0) {
|
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ret = 0;
|
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}
|
|
|
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return ret;
|
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}
|
|
|
|
static int kvm_check_many_ioeventfds(void)
|
|
{
|
|
/* Userspace can use ioeventfd for io notification. This requires a host
|
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* that supports eventfd(2) and an I/O thread; since eventfd does not
|
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* support SIGIO it cannot interrupt the vcpu.
|
|
*
|
|
* Older kernels have a 6 device limit on the KVM io bus. Find out so we
|
|
* can avoid creating too many ioeventfds.
|
|
*/
|
|
#if defined(CONFIG_EVENTFD) && defined(CONFIG_IOTHREAD)
|
|
int ioeventfds[7];
|
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int i, ret = 0;
|
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for (i = 0; i < ARRAY_SIZE(ioeventfds); i++) {
|
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ioeventfds[i] = eventfd(0, EFD_CLOEXEC);
|
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if (ioeventfds[i] < 0) {
|
|
break;
|
|
}
|
|
ret = kvm_set_ioeventfd_pio_word(ioeventfds[i], 0, i, true);
|
|
if (ret < 0) {
|
|
close(ioeventfds[i]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Decide whether many devices are supported or not */
|
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ret = i == ARRAY_SIZE(ioeventfds);
|
|
|
|
while (i-- > 0) {
|
|
kvm_set_ioeventfd_pio_word(ioeventfds[i], 0, i, false);
|
|
close(ioeventfds[i]);
|
|
}
|
|
return ret;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
static void kvm_set_phys_mem(target_phys_addr_t start_addr,
|
|
ram_addr_t size,
|
|
ram_addr_t phys_offset)
|
|
{
|
|
KVMState *s = kvm_state;
|
|
ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
|
|
KVMSlot *mem, old;
|
|
int err;
|
|
|
|
/* kvm works in page size chunks, but the function may be called
|
|
with sub-page size and unaligned start address. */
|
|
size = TARGET_PAGE_ALIGN(size);
|
|
start_addr = TARGET_PAGE_ALIGN(start_addr);
|
|
|
|
/* KVM does not support read-only slots */
|
|
phys_offset &= ~IO_MEM_ROM;
|
|
|
|
while (1) {
|
|
mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size);
|
|
if (!mem) {
|
|
break;
|
|
}
|
|
|
|
if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr &&
|
|
(start_addr + size <= mem->start_addr + mem->memory_size) &&
|
|
(phys_offset - start_addr == mem->phys_offset - mem->start_addr)) {
|
|
/* The new slot fits into the existing one and comes with
|
|
* identical parameters - nothing to be done. */
|
|
return;
|
|
}
|
|
|
|
old = *mem;
|
|
|
|
/* unregister the overlapping slot */
|
|
mem->memory_size = 0;
|
|
err = kvm_set_user_memory_region(s, mem);
|
|
if (err) {
|
|
fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
|
|
__func__, strerror(-err));
|
|
abort();
|
|
}
|
|
|
|
/* Workaround for older KVM versions: we can't join slots, even not by
|
|
* unregistering the previous ones and then registering the larger
|
|
* slot. We have to maintain the existing fragmentation. Sigh.
|
|
*
|
|
* This workaround assumes that the new slot starts at the same
|
|
* address as the first existing one. If not or if some overlapping
|
|
* slot comes around later, we will fail (not seen in practice so far)
|
|
* - and actually require a recent KVM version. */
|
|
if (s->broken_set_mem_region &&
|
|
old.start_addr == start_addr && old.memory_size < size &&
|
|
flags < IO_MEM_UNASSIGNED) {
|
|
mem = kvm_alloc_slot(s);
|
|
mem->memory_size = old.memory_size;
|
|
mem->start_addr = old.start_addr;
|
|
mem->phys_offset = old.phys_offset;
|
|
mem->flags = 0;
|
|
|
|
err = kvm_set_user_memory_region(s, mem);
|
|
if (err) {
|
|
fprintf(stderr, "%s: error updating slot: %s\n", __func__,
|
|
strerror(-err));
|
|
abort();
|
|
}
|
|
|
|
start_addr += old.memory_size;
|
|
phys_offset += old.memory_size;
|
|
size -= old.memory_size;
|
|
continue;
|
|
}
|
|
|
|
/* register prefix slot */
|
|
if (old.start_addr < start_addr) {
|
|
mem = kvm_alloc_slot(s);
|
|
mem->memory_size = start_addr - old.start_addr;
|
|
mem->start_addr = old.start_addr;
|
|
mem->phys_offset = old.phys_offset;
|
|
mem->flags = 0;
|
|
|
|
err = kvm_set_user_memory_region(s, mem);
|
|
if (err) {
|
|
fprintf(stderr, "%s: error registering prefix slot: %s\n",
|
|
__func__, strerror(-err));
|
|
abort();
|
|
}
|
|
}
|
|
|
|
/* register suffix slot */
|
|
if (old.start_addr + old.memory_size > start_addr + size) {
|
|
ram_addr_t size_delta;
|
|
|
|
mem = kvm_alloc_slot(s);
|
|
mem->start_addr = start_addr + size;
|
|
size_delta = mem->start_addr - old.start_addr;
|
|
mem->memory_size = old.memory_size - size_delta;
|
|
mem->phys_offset = old.phys_offset + size_delta;
|
|
mem->flags = 0;
|
|
|
|
err = kvm_set_user_memory_region(s, mem);
|
|
if (err) {
|
|
fprintf(stderr, "%s: error registering suffix slot: %s\n",
|
|
__func__, strerror(-err));
|
|
abort();
|
|
}
|
|
}
|
|
}
|
|
|
|
/* in case the KVM bug workaround already "consumed" the new slot */
|
|
if (!size)
|
|
return;
|
|
|
|
/* KVM does not need to know about this memory */
|
|
if (flags >= IO_MEM_UNASSIGNED)
|
|
return;
|
|
|
|
mem = kvm_alloc_slot(s);
|
|
mem->memory_size = size;
|
|
mem->start_addr = start_addr;
|
|
mem->phys_offset = phys_offset;
|
|
mem->flags = 0;
|
|
|
|
err = kvm_set_user_memory_region(s, mem);
|
|
if (err) {
|
|
fprintf(stderr, "%s: error registering slot: %s\n", __func__,
|
|
strerror(-err));
|
|
abort();
|
|
}
|
|
}
|
|
|
|
static void kvm_client_set_memory(struct CPUPhysMemoryClient *client,
|
|
target_phys_addr_t start_addr,
|
|
ram_addr_t size,
|
|
ram_addr_t phys_offset)
|
|
{
|
|
kvm_set_phys_mem(start_addr, size, phys_offset);
|
|
}
|
|
|
|
static int kvm_client_sync_dirty_bitmap(struct CPUPhysMemoryClient *client,
|
|
target_phys_addr_t start_addr,
|
|
target_phys_addr_t end_addr)
|
|
{
|
|
return kvm_physical_sync_dirty_bitmap(start_addr, end_addr);
|
|
}
|
|
|
|
static int kvm_client_migration_log(struct CPUPhysMemoryClient *client,
|
|
int enable)
|
|
{
|
|
return kvm_set_migration_log(enable);
|
|
}
|
|
|
|
static CPUPhysMemoryClient kvm_cpu_phys_memory_client = {
|
|
.set_memory = kvm_client_set_memory,
|
|
.sync_dirty_bitmap = kvm_client_sync_dirty_bitmap,
|
|
.migration_log = kvm_client_migration_log,
|
|
};
|
|
|
|
int kvm_init(int smp_cpus)
|
|
{
|
|
static const char upgrade_note[] =
|
|
"Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
|
|
"(see http://sourceforge.net/projects/kvm).\n";
|
|
KVMState *s;
|
|
int ret;
|
|
int i;
|
|
|
|
s = qemu_mallocz(sizeof(KVMState));
|
|
|
|
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
|
QTAILQ_INIT(&s->kvm_sw_breakpoints);
|
|
#endif
|
|
for (i = 0; i < ARRAY_SIZE(s->slots); i++)
|
|
s->slots[i].slot = i;
|
|
|
|
s->vmfd = -1;
|
|
s->fd = qemu_open("/dev/kvm", O_RDWR);
|
|
if (s->fd == -1) {
|
|
fprintf(stderr, "Could not access KVM kernel module: %m\n");
|
|
ret = -errno;
|
|
goto err;
|
|
}
|
|
|
|
ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
|
|
if (ret < KVM_API_VERSION) {
|
|
if (ret > 0)
|
|
ret = -EINVAL;
|
|
fprintf(stderr, "kvm version too old\n");
|
|
goto err;
|
|
}
|
|
|
|
if (ret > KVM_API_VERSION) {
|
|
ret = -EINVAL;
|
|
fprintf(stderr, "kvm version not supported\n");
|
|
goto err;
|
|
}
|
|
|
|
s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
|
|
if (s->vmfd < 0) {
|
|
#ifdef TARGET_S390X
|
|
fprintf(stderr, "Please add the 'switch_amode' kernel parameter to "
|
|
"your host kernel command line\n");
|
|
#endif
|
|
goto err;
|
|
}
|
|
|
|
/* initially, KVM allocated its own memory and we had to jump through
|
|
* hooks to make phys_ram_base point to this. Modern versions of KVM
|
|
* just use a user allocated buffer so we can use regular pages
|
|
* unmodified. Make sure we have a sufficiently modern version of KVM.
|
|
*/
|
|
if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) {
|
|
ret = -EINVAL;
|
|
fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s",
|
|
upgrade_note);
|
|
goto err;
|
|
}
|
|
|
|
/* There was a nasty bug in < kvm-80 that prevents memory slots from being
|
|
* destroyed properly. Since we rely on this capability, refuse to work
|
|
* with any kernel without this capability. */
|
|
if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) {
|
|
ret = -EINVAL;
|
|
|
|
fprintf(stderr,
|
|
"KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s",
|
|
upgrade_note);
|
|
goto err;
|
|
}
|
|
|
|
s->coalesced_mmio = 0;
|
|
#ifdef KVM_CAP_COALESCED_MMIO
|
|
s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);
|
|
s->coalesced_mmio_ring = NULL;
|
|
#endif
|
|
|
|
s->broken_set_mem_region = 1;
|
|
#ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
|
|
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS);
|
|
if (ret > 0) {
|
|
s->broken_set_mem_region = 0;
|
|
}
|
|
#endif
|
|
|
|
s->vcpu_events = 0;
|
|
#ifdef KVM_CAP_VCPU_EVENTS
|
|
s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS);
|
|
#endif
|
|
|
|
s->robust_singlestep = 0;
|
|
#ifdef KVM_CAP_X86_ROBUST_SINGLESTEP
|
|
s->robust_singlestep =
|
|
kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP);
|
|
#endif
|
|
|
|
s->debugregs = 0;
|
|
#ifdef KVM_CAP_DEBUGREGS
|
|
s->debugregs = kvm_check_extension(s, KVM_CAP_DEBUGREGS);
|
|
#endif
|
|
|
|
s->xsave = 0;
|
|
#ifdef KVM_CAP_XSAVE
|
|
s->xsave = kvm_check_extension(s, KVM_CAP_XSAVE);
|
|
#endif
|
|
|
|
s->xcrs = 0;
|
|
#ifdef KVM_CAP_XCRS
|
|
s->xcrs = kvm_check_extension(s, KVM_CAP_XCRS);
|
|
#endif
|
|
|
|
ret = kvm_arch_init(s, smp_cpus);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
kvm_state = s;
|
|
cpu_register_phys_memory_client(&kvm_cpu_phys_memory_client);
|
|
|
|
s->many_ioeventfds = kvm_check_many_ioeventfds();
|
|
|
|
return 0;
|
|
|
|
err:
|
|
if (s) {
|
|
if (s->vmfd != -1)
|
|
close(s->vmfd);
|
|
if (s->fd != -1)
|
|
close(s->fd);
|
|
}
|
|
qemu_free(s);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int kvm_handle_io(uint16_t port, void *data, int direction, int size,
|
|
uint32_t count)
|
|
{
|
|
int i;
|
|
uint8_t *ptr = data;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (direction == KVM_EXIT_IO_IN) {
|
|
switch (size) {
|
|
case 1:
|
|
stb_p(ptr, cpu_inb(port));
|
|
break;
|
|
case 2:
|
|
stw_p(ptr, cpu_inw(port));
|
|
break;
|
|
case 4:
|
|
stl_p(ptr, cpu_inl(port));
|
|
break;
|
|
}
|
|
} else {
|
|
switch (size) {
|
|
case 1:
|
|
cpu_outb(port, ldub_p(ptr));
|
|
break;
|
|
case 2:
|
|
cpu_outw(port, lduw_p(ptr));
|
|
break;
|
|
case 4:
|
|
cpu_outl(port, ldl_p(ptr));
|
|
break;
|
|
}
|
|
}
|
|
|
|
ptr += size;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifdef KVM_CAP_INTERNAL_ERROR_DATA
|
|
static void kvm_handle_internal_error(CPUState *env, struct kvm_run *run)
|
|
{
|
|
|
|
if (kvm_check_extension(kvm_state, KVM_CAP_INTERNAL_ERROR_DATA)) {
|
|
int i;
|
|
|
|
fprintf(stderr, "KVM internal error. Suberror: %d\n",
|
|
run->internal.suberror);
|
|
|
|
for (i = 0; i < run->internal.ndata; ++i) {
|
|
fprintf(stderr, "extra data[%d]: %"PRIx64"\n",
|
|
i, (uint64_t)run->internal.data[i]);
|
|
}
|
|
}
|
|
cpu_dump_state(env, stderr, fprintf, 0);
|
|
if (run->internal.suberror == KVM_INTERNAL_ERROR_EMULATION) {
|
|
fprintf(stderr, "emulation failure\n");
|
|
if (!kvm_arch_stop_on_emulation_error(env))
|
|
return;
|
|
}
|
|
/* FIXME: Should trigger a qmp message to let management know
|
|
* something went wrong.
|
|
*/
|
|
vm_stop(0);
|
|
}
|
|
#endif
|
|
|
|
void kvm_flush_coalesced_mmio_buffer(void)
|
|
{
|
|
#ifdef KVM_CAP_COALESCED_MMIO
|
|
KVMState *s = kvm_state;
|
|
if (s->coalesced_mmio_ring) {
|
|
struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;
|
|
while (ring->first != ring->last) {
|
|
struct kvm_coalesced_mmio *ent;
|
|
|
|
ent = &ring->coalesced_mmio[ring->first];
|
|
|
|
cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
|
|
smp_wmb();
|
|
ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void do_kvm_cpu_synchronize_state(void *_env)
|
|
{
|
|
CPUState *env = _env;
|
|
|
|
if (!env->kvm_vcpu_dirty) {
|
|
kvm_arch_get_registers(env);
|
|
env->kvm_vcpu_dirty = 1;
|
|
}
|
|
}
|
|
|
|
void kvm_cpu_synchronize_state(CPUState *env)
|
|
{
|
|
if (!env->kvm_vcpu_dirty)
|
|
run_on_cpu(env, do_kvm_cpu_synchronize_state, env);
|
|
}
|
|
|
|
void kvm_cpu_synchronize_post_reset(CPUState *env)
|
|
{
|
|
kvm_arch_put_registers(env, KVM_PUT_RESET_STATE);
|
|
env->kvm_vcpu_dirty = 0;
|
|
}
|
|
|
|
void kvm_cpu_synchronize_post_init(CPUState *env)
|
|
{
|
|
kvm_arch_put_registers(env, KVM_PUT_FULL_STATE);
|
|
env->kvm_vcpu_dirty = 0;
|
|
}
|
|
|
|
int kvm_cpu_exec(CPUState *env)
|
|
{
|
|
struct kvm_run *run = env->kvm_run;
|
|
int ret;
|
|
|
|
DPRINTF("kvm_cpu_exec()\n");
|
|
|
|
do {
|
|
#ifndef CONFIG_IOTHREAD
|
|
if (env->exit_request) {
|
|
DPRINTF("interrupt exit requested\n");
|
|
ret = 0;
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
if (kvm_arch_process_irqchip_events(env)) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
if (env->kvm_vcpu_dirty) {
|
|
kvm_arch_put_registers(env, KVM_PUT_RUNTIME_STATE);
|
|
env->kvm_vcpu_dirty = 0;
|
|
}
|
|
|
|
kvm_arch_pre_run(env, run);
|
|
cpu_single_env = NULL;
|
|
qemu_mutex_unlock_iothread();
|
|
ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
|
|
qemu_mutex_lock_iothread();
|
|
cpu_single_env = env;
|
|
kvm_arch_post_run(env, run);
|
|
|
|
if (ret == -EINTR || ret == -EAGAIN) {
|
|
cpu_exit(env);
|
|
DPRINTF("io window exit\n");
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
if (ret < 0) {
|
|
DPRINTF("kvm run failed %s\n", strerror(-ret));
|
|
abort();
|
|
}
|
|
|
|
kvm_flush_coalesced_mmio_buffer();
|
|
|
|
ret = 0; /* exit loop */
|
|
switch (run->exit_reason) {
|
|
case KVM_EXIT_IO:
|
|
DPRINTF("handle_io\n");
|
|
ret = kvm_handle_io(run->io.port,
|
|
(uint8_t *)run + run->io.data_offset,
|
|
run->io.direction,
|
|
run->io.size,
|
|
run->io.count);
|
|
break;
|
|
case KVM_EXIT_MMIO:
|
|
DPRINTF("handle_mmio\n");
|
|
cpu_physical_memory_rw(run->mmio.phys_addr,
|
|
run->mmio.data,
|
|
run->mmio.len,
|
|
run->mmio.is_write);
|
|
ret = 1;
|
|
break;
|
|
case KVM_EXIT_IRQ_WINDOW_OPEN:
|
|
DPRINTF("irq_window_open\n");
|
|
break;
|
|
case KVM_EXIT_SHUTDOWN:
|
|
DPRINTF("shutdown\n");
|
|
qemu_system_reset_request();
|
|
ret = 1;
|
|
break;
|
|
case KVM_EXIT_UNKNOWN:
|
|
DPRINTF("kvm_exit_unknown\n");
|
|
break;
|
|
case KVM_EXIT_FAIL_ENTRY:
|
|
DPRINTF("kvm_exit_fail_entry\n");
|
|
break;
|
|
case KVM_EXIT_EXCEPTION:
|
|
DPRINTF("kvm_exit_exception\n");
|
|
break;
|
|
#ifdef KVM_CAP_INTERNAL_ERROR_DATA
|
|
case KVM_EXIT_INTERNAL_ERROR:
|
|
kvm_handle_internal_error(env, run);
|
|
break;
|
|
#endif
|
|
case KVM_EXIT_DEBUG:
|
|
DPRINTF("kvm_exit_debug\n");
|
|
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
|
if (kvm_arch_debug(&run->debug.arch)) {
|
|
env->exception_index = EXCP_DEBUG;
|
|
return 0;
|
|
}
|
|
/* re-enter, this exception was guest-internal */
|
|
ret = 1;
|
|
#endif /* KVM_CAP_SET_GUEST_DEBUG */
|
|
break;
|
|
default:
|
|
DPRINTF("kvm_arch_handle_exit\n");
|
|
ret = kvm_arch_handle_exit(env, run);
|
|
break;
|
|
}
|
|
} while (ret > 0);
|
|
|
|
if (env->exit_request) {
|
|
env->exit_request = 0;
|
|
env->exception_index = EXCP_INTERRUPT;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int kvm_ioctl(KVMState *s, int type, ...)
|
|
{
|
|
int ret;
|
|
void *arg;
|
|
va_list ap;
|
|
|
|
va_start(ap, type);
|
|
arg = va_arg(ap, void *);
|
|
va_end(ap);
|
|
|
|
ret = ioctl(s->fd, type, arg);
|
|
if (ret == -1)
|
|
ret = -errno;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int kvm_vm_ioctl(KVMState *s, int type, ...)
|
|
{
|
|
int ret;
|
|
void *arg;
|
|
va_list ap;
|
|
|
|
va_start(ap, type);
|
|
arg = va_arg(ap, void *);
|
|
va_end(ap);
|
|
|
|
ret = ioctl(s->vmfd, type, arg);
|
|
if (ret == -1)
|
|
ret = -errno;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int kvm_vcpu_ioctl(CPUState *env, int type, ...)
|
|
{
|
|
int ret;
|
|
void *arg;
|
|
va_list ap;
|
|
|
|
va_start(ap, type);
|
|
arg = va_arg(ap, void *);
|
|
va_end(ap);
|
|
|
|
ret = ioctl(env->kvm_fd, type, arg);
|
|
if (ret == -1)
|
|
ret = -errno;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int kvm_has_sync_mmu(void)
|
|
{
|
|
#ifdef KVM_CAP_SYNC_MMU
|
|
KVMState *s = kvm_state;
|
|
|
|
return kvm_check_extension(s, KVM_CAP_SYNC_MMU);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
int kvm_has_vcpu_events(void)
|
|
{
|
|
return kvm_state->vcpu_events;
|
|
}
|
|
|
|
int kvm_has_robust_singlestep(void)
|
|
{
|
|
return kvm_state->robust_singlestep;
|
|
}
|
|
|
|
int kvm_has_debugregs(void)
|
|
{
|
|
return kvm_state->debugregs;
|
|
}
|
|
|
|
int kvm_has_xsave(void)
|
|
{
|
|
return kvm_state->xsave;
|
|
}
|
|
|
|
int kvm_has_xcrs(void)
|
|
{
|
|
return kvm_state->xcrs;
|
|
}
|
|
|
|
int kvm_has_many_ioeventfds(void)
|
|
{
|
|
if (!kvm_enabled()) {
|
|
return 0;
|
|
}
|
|
return kvm_state->many_ioeventfds;
|
|
}
|
|
|
|
void kvm_setup_guest_memory(void *start, size_t size)
|
|
{
|
|
if (!kvm_has_sync_mmu()) {
|
|
int ret = qemu_madvise(start, size, QEMU_MADV_DONTFORK);
|
|
|
|
if (ret) {
|
|
perror("qemu_madvise");
|
|
fprintf(stderr,
|
|
"Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
|
struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env,
|
|
target_ulong pc)
|
|
{
|
|
struct kvm_sw_breakpoint *bp;
|
|
|
|
QTAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) {
|
|
if (bp->pc == pc)
|
|
return bp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int kvm_sw_breakpoints_active(CPUState *env)
|
|
{
|
|
return !QTAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
|
|
}
|
|
|
|
struct kvm_set_guest_debug_data {
|
|
struct kvm_guest_debug dbg;
|
|
CPUState *env;
|
|
int err;
|
|
};
|
|
|
|
static void kvm_invoke_set_guest_debug(void *data)
|
|
{
|
|
struct kvm_set_guest_debug_data *dbg_data = data;
|
|
CPUState *env = dbg_data->env;
|
|
|
|
dbg_data->err = kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg_data->dbg);
|
|
}
|
|
|
|
int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
|
|
{
|
|
struct kvm_set_guest_debug_data data;
|
|
|
|
data.dbg.control = reinject_trap;
|
|
|
|
if (env->singlestep_enabled) {
|
|
data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
|
|
}
|
|
kvm_arch_update_guest_debug(env, &data.dbg);
|
|
data.env = env;
|
|
|
|
run_on_cpu(env, kvm_invoke_set_guest_debug, &data);
|
|
return data.err;
|
|
}
|
|
|
|
int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
|
|
target_ulong len, int type)
|
|
{
|
|
struct kvm_sw_breakpoint *bp;
|
|
CPUState *env;
|
|
int err;
|
|
|
|
if (type == GDB_BREAKPOINT_SW) {
|
|
bp = kvm_find_sw_breakpoint(current_env, addr);
|
|
if (bp) {
|
|
bp->use_count++;
|
|
return 0;
|
|
}
|
|
|
|
bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint));
|
|
if (!bp)
|
|
return -ENOMEM;
|
|
|
|
bp->pc = addr;
|
|
bp->use_count = 1;
|
|
err = kvm_arch_insert_sw_breakpoint(current_env, bp);
|
|
if (err) {
|
|
free(bp);
|
|
return err;
|
|
}
|
|
|
|
QTAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints,
|
|
bp, entry);
|
|
} else {
|
|
err = kvm_arch_insert_hw_breakpoint(addr, len, type);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
for (env = first_cpu; env != NULL; env = env->next_cpu) {
|
|
err = kvm_update_guest_debug(env, 0);
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
|
|
target_ulong len, int type)
|
|
{
|
|
struct kvm_sw_breakpoint *bp;
|
|
CPUState *env;
|
|
int err;
|
|
|
|
if (type == GDB_BREAKPOINT_SW) {
|
|
bp = kvm_find_sw_breakpoint(current_env, addr);
|
|
if (!bp)
|
|
return -ENOENT;
|
|
|
|
if (bp->use_count > 1) {
|
|
bp->use_count--;
|
|
return 0;
|
|
}
|
|
|
|
err = kvm_arch_remove_sw_breakpoint(current_env, bp);
|
|
if (err)
|
|
return err;
|
|
|
|
QTAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry);
|
|
qemu_free(bp);
|
|
} else {
|
|
err = kvm_arch_remove_hw_breakpoint(addr, len, type);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
for (env = first_cpu; env != NULL; env = env->next_cpu) {
|
|
err = kvm_update_guest_debug(env, 0);
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void kvm_remove_all_breakpoints(CPUState *current_env)
|
|
{
|
|
struct kvm_sw_breakpoint *bp, *next;
|
|
KVMState *s = current_env->kvm_state;
|
|
CPUState *env;
|
|
|
|
QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) {
|
|
if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) {
|
|
/* Try harder to find a CPU that currently sees the breakpoint. */
|
|
for (env = first_cpu; env != NULL; env = env->next_cpu) {
|
|
if (kvm_arch_remove_sw_breakpoint(env, bp) == 0)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
kvm_arch_remove_all_hw_breakpoints();
|
|
|
|
for (env = first_cpu; env != NULL; env = env->next_cpu)
|
|
kvm_update_guest_debug(env, 0);
|
|
}
|
|
|
|
#else /* !KVM_CAP_SET_GUEST_DEBUG */
|
|
|
|
int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
|
|
target_ulong len, int type)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
|
|
target_ulong len, int type)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
void kvm_remove_all_breakpoints(CPUState *current_env)
|
|
{
|
|
}
|
|
#endif /* !KVM_CAP_SET_GUEST_DEBUG */
|
|
|
|
int kvm_set_signal_mask(CPUState *env, const sigset_t *sigset)
|
|
{
|
|
struct kvm_signal_mask *sigmask;
|
|
int r;
|
|
|
|
if (!sigset)
|
|
return kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, NULL);
|
|
|
|
sigmask = qemu_malloc(sizeof(*sigmask) + sizeof(*sigset));
|
|
|
|
sigmask->len = 8;
|
|
memcpy(sigmask->sigset, sigset, sizeof(*sigset));
|
|
r = kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, sigmask);
|
|
free(sigmask);
|
|
|
|
return r;
|
|
}
|
|
|
|
int kvm_set_ioeventfd_mmio_long(int fd, uint32_t addr, uint32_t val, bool assign)
|
|
{
|
|
#ifdef KVM_IOEVENTFD
|
|
int ret;
|
|
struct kvm_ioeventfd iofd;
|
|
|
|
iofd.datamatch = val;
|
|
iofd.addr = addr;
|
|
iofd.len = 4;
|
|
iofd.flags = KVM_IOEVENTFD_FLAG_DATAMATCH;
|
|
iofd.fd = fd;
|
|
|
|
if (!kvm_enabled()) {
|
|
return -ENOSYS;
|
|
}
|
|
|
|
if (!assign) {
|
|
iofd.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
|
|
}
|
|
|
|
ret = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &iofd);
|
|
|
|
if (ret < 0) {
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
#else
|
|
return -ENOSYS;
|
|
#endif
|
|
}
|
|
|
|
int kvm_set_ioeventfd_pio_word(int fd, uint16_t addr, uint16_t val, bool assign)
|
|
{
|
|
#ifdef KVM_IOEVENTFD
|
|
struct kvm_ioeventfd kick = {
|
|
.datamatch = val,
|
|
.addr = addr,
|
|
.len = 2,
|
|
.flags = KVM_IOEVENTFD_FLAG_DATAMATCH | KVM_IOEVENTFD_FLAG_PIO,
|
|
.fd = fd,
|
|
};
|
|
int r;
|
|
if (!kvm_enabled())
|
|
return -ENOSYS;
|
|
if (!assign)
|
|
kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
|
|
r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
|
|
if (r < 0)
|
|
return r;
|
|
return 0;
|
|
#else
|
|
return -ENOSYS;
|
|
#endif
|
|
}
|