564 lines
14 KiB
C
564 lines
14 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 "sysemu.h"
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#include "kvm.h"
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//#define DEBUG_KVM
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#ifdef DEBUG_KVM
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#define dprintf(fmt, ...) \
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do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
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#else
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#define dprintf(fmt, ...) \
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do { } while (0)
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#endif
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typedef struct KVMSlot
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{
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target_phys_addr_t start_addr;
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ram_addr_t memory_size;
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ram_addr_t phys_offset;
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int slot;
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int flags;
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} KVMSlot;
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typedef struct kvm_dirty_log KVMDirtyLog;
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int kvm_allowed = 0;
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struct KVMState
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{
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KVMSlot slots[32];
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int fd;
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int vmfd;
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};
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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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return NULL;
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}
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static KVMSlot *kvm_lookup_slot(KVMState *s, target_phys_addr_t start_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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start_addr < (mem->start_addr + mem->memory_size))
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return mem;
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}
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return NULL;
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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)phys_ram_base + slot->phys_offset;
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mem.flags = slot->flags;
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return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
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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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ret = kvm_arch_init_vcpu(env);
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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, target_phys_addr_t end_addr,
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unsigned flags,
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unsigned mask)
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{
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KVMState *s = kvm_state;
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KVMSlot *mem = kvm_lookup_slot(s, phys_addr);
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if (mem == NULL) {
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dprintf("invalid parameters %llx-%llx\n", phys_addr, end_addr);
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return -EINVAL;
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}
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flags = (mem->flags & ~mask) | flags;
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/* Nothing changed, no need to issue ioctl */
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if (flags == mem->flags)
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return 0;
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mem->flags = flags;
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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, target_phys_addr_t end_addr)
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{
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return kvm_dirty_pages_log_change(phys_addr, end_addr,
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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, target_phys_addr_t end_addr)
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{
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return kvm_dirty_pages_log_change(phys_addr, end_addr,
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0,
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KVM_MEM_LOG_DIRTY_PAGES);
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}
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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. This is what we use to search the memslot
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* @end_addr: end of logged region.
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*/
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void kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, target_phys_addr_t end_addr)
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{
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KVMState *s = kvm_state;
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KVMDirtyLog d;
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KVMSlot *mem = kvm_lookup_slot(s, start_addr);
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unsigned long alloc_size;
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ram_addr_t addr;
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target_phys_addr_t phys_addr = start_addr;
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dprintf("sync addr: %llx into %lx\n", start_addr, mem->phys_offset);
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if (mem == NULL) {
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fprintf(stderr, "BUG: %s: invalid parameters\n", __func__);
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return;
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}
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alloc_size = mem->memory_size >> TARGET_PAGE_BITS / sizeof(d.dirty_bitmap);
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d.dirty_bitmap = qemu_mallocz(alloc_size);
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if (d.dirty_bitmap == NULL) {
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dprintf("Could not allocate dirty bitmap\n");
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return;
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}
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d.slot = mem->slot;
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dprintf("slot %d, phys_addr %llx, uaddr: %llx\n",
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d.slot, mem->start_addr, mem->phys_offset);
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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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goto out;
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}
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phys_addr = start_addr;
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for (addr = mem->phys_offset; phys_addr < end_addr; phys_addr+= TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) {
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unsigned long *bitmap = (unsigned long *)d.dirty_bitmap;
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unsigned nr = (phys_addr - start_addr) >> TARGET_PAGE_BITS;
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unsigned word = nr / (sizeof(*bitmap) * 8);
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unsigned bit = nr % (sizeof(*bitmap) * 8);
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if ((bitmap[word] >> bit) & 1)
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cpu_physical_memory_set_dirty(addr);
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}
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out:
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qemu_free(d.dirty_bitmap);
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}
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int kvm_init(int smp_cpus)
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{
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KVMState *s;
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int ret;
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int i;
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if (smp_cpus > 1)
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return -EINVAL;
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s = qemu_mallocz(sizeof(KVMState));
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if (s == NULL)
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return -ENOMEM;
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for (i = 0; i < ARRAY_SIZE(s->slots); i++)
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s->slots[i].slot = i;
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s->vmfd = -1;
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s->fd = open("/dev/kvm", O_RDWR);
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if (s->fd == -1) {
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fprintf(stderr, "Could not access KVM kernel module: %m\n");
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ret = -errno;
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goto err;
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}
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ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
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if (ret < KVM_API_VERSION) {
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if (ret > 0)
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ret = -EINVAL;
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fprintf(stderr, "kvm version too old\n");
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goto err;
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}
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if (ret > KVM_API_VERSION) {
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ret = -EINVAL;
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fprintf(stderr, "kvm version not supported\n");
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goto err;
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}
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s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
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if (s->vmfd < 0)
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goto err;
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/* initially, KVM allocated its own memory and we had to jump through
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* hooks to make phys_ram_base point to this. Modern versions of KVM
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* just use a user allocated buffer so we can use phys_ram_base
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* unmodified. Make sure we have a sufficiently modern version of KVM.
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*/
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ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY);
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if (ret <= 0) {
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if (ret == 0)
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ret = -EINVAL;
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fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n");
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goto err;
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}
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ret = kvm_arch_init(s, smp_cpus);
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if (ret < 0)
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goto err;
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kvm_state = s;
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return 0;
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err:
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if (s) {
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if (s->vmfd != -1)
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close(s->vmfd);
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if (s->fd != -1)
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close(s->fd);
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}
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qemu_free(s);
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return ret;
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}
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static int kvm_handle_io(CPUState *env, uint16_t port, void *data,
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int direction, int size, uint32_t count)
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{
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int i;
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uint8_t *ptr = data;
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for (i = 0; i < count; i++) {
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if (direction == KVM_EXIT_IO_IN) {
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switch (size) {
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case 1:
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stb_p(ptr, cpu_inb(env, port));
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break;
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case 2:
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stw_p(ptr, cpu_inw(env, port));
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break;
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case 4:
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stl_p(ptr, cpu_inl(env, port));
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break;
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}
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} else {
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switch (size) {
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case 1:
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cpu_outb(env, port, ldub_p(ptr));
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break;
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case 2:
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cpu_outw(env, port, lduw_p(ptr));
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break;
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case 4:
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cpu_outl(env, port, ldl_p(ptr));
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break;
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}
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}
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ptr += size;
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}
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return 1;
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}
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int kvm_cpu_exec(CPUState *env)
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{
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struct kvm_run *run = env->kvm_run;
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int ret;
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dprintf("kvm_cpu_exec()\n");
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do {
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kvm_arch_pre_run(env, run);
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if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
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dprintf("interrupt exit requested\n");
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ret = 0;
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break;
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}
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ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
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kvm_arch_post_run(env, run);
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if (ret == -EINTR || ret == -EAGAIN) {
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dprintf("io window exit\n");
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ret = 0;
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break;
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}
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if (ret < 0) {
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dprintf("kvm run failed %s\n", strerror(-ret));
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abort();
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}
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ret = 0; /* exit loop */
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switch (run->exit_reason) {
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case KVM_EXIT_IO:
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dprintf("handle_io\n");
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ret = kvm_handle_io(env, run->io.port,
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(uint8_t *)run + run->io.data_offset,
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run->io.direction,
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run->io.size,
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run->io.count);
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break;
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case KVM_EXIT_MMIO:
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dprintf("handle_mmio\n");
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cpu_physical_memory_rw(run->mmio.phys_addr,
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run->mmio.data,
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run->mmio.len,
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run->mmio.is_write);
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ret = 1;
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break;
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case KVM_EXIT_IRQ_WINDOW_OPEN:
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dprintf("irq_window_open\n");
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break;
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case KVM_EXIT_SHUTDOWN:
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dprintf("shutdown\n");
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qemu_system_reset_request();
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ret = 1;
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break;
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case KVM_EXIT_UNKNOWN:
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dprintf("kvm_exit_unknown\n");
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break;
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case KVM_EXIT_FAIL_ENTRY:
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dprintf("kvm_exit_fail_entry\n");
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break;
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case KVM_EXIT_EXCEPTION:
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dprintf("kvm_exit_exception\n");
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break;
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case KVM_EXIT_DEBUG:
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dprintf("kvm_exit_debug\n");
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break;
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default:
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dprintf("kvm_arch_handle_exit\n");
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ret = kvm_arch_handle_exit(env, run);
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break;
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}
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} while (ret > 0);
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if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
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env->interrupt_request &= ~CPU_INTERRUPT_EXIT;
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env->exception_index = EXCP_INTERRUPT;
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}
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return ret;
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}
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void kvm_set_phys_mem(target_phys_addr_t start_addr,
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ram_addr_t size,
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ram_addr_t phys_offset)
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{
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KVMState *s = kvm_state;
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ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
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KVMSlot *mem;
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/* KVM does not support read-only slots */
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phys_offset &= ~IO_MEM_ROM;
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mem = kvm_lookup_slot(s, start_addr);
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if (mem) {
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if ((flags == IO_MEM_UNASSIGNED) || (flags >= TLB_MMIO)) {
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mem->memory_size = 0;
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mem->start_addr = start_addr;
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mem->phys_offset = 0;
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mem->flags = 0;
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kvm_set_user_memory_region(s, mem);
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} else if (start_addr >= mem->start_addr &&
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(start_addr + size) <= (mem->start_addr +
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mem->memory_size)) {
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KVMSlot slot;
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target_phys_addr_t mem_start;
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ram_addr_t mem_size, mem_offset;
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/* Not splitting */
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if ((phys_offset - (start_addr - mem->start_addr)) ==
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mem->phys_offset)
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return;
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/* unregister whole slot */
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memcpy(&slot, mem, sizeof(slot));
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mem->memory_size = 0;
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kvm_set_user_memory_region(s, mem);
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/* register prefix slot */
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mem_start = slot.start_addr;
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mem_size = start_addr - slot.start_addr;
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mem_offset = slot.phys_offset;
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if (mem_size)
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kvm_set_phys_mem(mem_start, mem_size, mem_offset);
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/* register new slot */
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kvm_set_phys_mem(start_addr, size, phys_offset);
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/* register suffix slot */
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mem_start = start_addr + size;
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mem_offset += mem_size + size;
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mem_size = slot.memory_size - mem_size - size;
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if (mem_size)
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kvm_set_phys_mem(mem_start, mem_size, mem_offset);
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return;
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} else {
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printf("Registering overlapping slot\n");
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abort();
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}
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}
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/* KVM does not need to know about this memory */
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if (flags >= IO_MEM_UNASSIGNED)
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return;
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mem = kvm_alloc_slot(s);
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mem->memory_size = size;
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mem->start_addr = start_addr;
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mem->phys_offset = phys_offset;
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mem->flags = 0;
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kvm_set_user_memory_region(s, mem);
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/* FIXME deal with errors */
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}
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int kvm_ioctl(KVMState *s, int type, ...)
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{
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int ret;
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void *arg;
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va_list ap;
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va_start(ap, type);
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arg = va_arg(ap, void *);
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va_end(ap);
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ret = ioctl(s->fd, type, arg);
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if (ret == -1)
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ret = -errno;
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return ret;
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}
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int kvm_vm_ioctl(KVMState *s, int type, ...)
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{
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int ret;
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void *arg;
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va_list ap;
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va_start(ap, type);
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arg = va_arg(ap, void *);
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va_end(ap);
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ret = ioctl(s->vmfd, type, arg);
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if (ret == -1)
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ret = -errno;
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return ret;
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}
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int kvm_vcpu_ioctl(CPUState *env, int type, ...)
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{
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int ret;
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void *arg;
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va_list ap;
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va_start(ap, type);
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arg = va_arg(ap, void *);
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va_end(ap);
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ret = ioctl(env->kvm_fd, type, arg);
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|
if (ret == -1)
|
|
ret = -errno;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int kvm_has_sync_mmu(void)
|
|
{
|
|
KVMState *s = kvm_state;
|
|
|
|
#ifdef KVM_CAP_SYNC_MMU
|
|
if (kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_SYNC_MMU) > 0)
|
|
return 1;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|