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/*
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* QEMU KVM support
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*
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* Copyright IBM, Corp. 2008
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* Red Hat, Inc. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Glauber Costa <gcosta@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include <sys/types.h> |
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#include <sys/ioctl.h> |
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#include <sys/mman.h> |
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#include <stdarg.h> |
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#include <linux/kvm.h> |
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#include "qemu-common.h" |
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#include "sysemu.h" |
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#include "kvm.h" |
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|
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/* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */
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#define PAGE_SIZE TARGET_PAGE_SIZE
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|
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//#define DEBUG_KVM
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|
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#ifdef DEBUG_KVM
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#define dprintf(fmt, ...) \
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do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) |
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#else
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#define dprintf(fmt, ...) \
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do { } while (0) |
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#endif
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typedef struct KVMSlot |
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{ |
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target_phys_addr_t start_addr; |
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ram_addr_t memory_size; |
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ram_addr_t phys_offset; |
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int slot;
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int flags;
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} KVMSlot; |
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typedef struct kvm_dirty_log KVMDirtyLog; |
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int kvm_allowed = 0; |
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|
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struct KVMState
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{ |
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KVMSlot slots[32];
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int fd;
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int vmfd;
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int coalesced_mmio;
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}; |
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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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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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|
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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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start_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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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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} |
120 |
|
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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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} |
137 |
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ret = kvm_arch_init_vcpu(env); |
139 |
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err:
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return ret;
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} |
143 |
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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); |
153 |
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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} |
157 |
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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; |
162 |
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mem->flags = flags; |
164 |
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return kvm_set_user_memory_region(s, mem);
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} |
167 |
|
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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); |
180 |
} |
181 |
|
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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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} |
204 |
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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); |
207 |
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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) { |
218 |
dprintf("ioctl failed %d\n", errno);
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goto out;
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} |
221 |
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phys_addr = start_addr; |
223 |
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); |
230 |
} |
231 |
out:
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qemu_free(d.dirty_bitmap); |
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} |
234 |
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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; |
240 |
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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; |
246 |
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ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); |
248 |
} |
249 |
#endif
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250 |
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return ret;
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} |
253 |
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int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
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{ |
256 |
int ret = -ENOSYS;
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#ifdef KVM_CAP_COALESCED_MMIO
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KVMState *s = kvm_state; |
259 |
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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; |
264 |
zone.size = size; |
265 |
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ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); |
267 |
} |
268 |
#endif
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269 |
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return ret;
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} |
272 |
|
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int kvm_init(int smp_cpus) |
274 |
{ |
275 |
KVMState *s; |
276 |
int ret;
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277 |
int i;
|
278 |
|
279 |
if (smp_cpus > 1) |
280 |
return -EINVAL;
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281 |
|
282 |
s = qemu_mallocz(sizeof(KVMState));
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283 |
if (s == NULL) |
284 |
return -ENOMEM;
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285 |
|
286 |
for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
287 |
s->slots[i].slot = i; |
288 |
|
289 |
s->vmfd = -1;
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290 |
s->fd = open("/dev/kvm", O_RDWR);
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291 |
if (s->fd == -1) { |
292 |
fprintf(stderr, "Could not access KVM kernel module: %m\n");
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293 |
ret = -errno; |
294 |
goto err;
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295 |
} |
296 |
|
297 |
ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
|
298 |
if (ret < KVM_API_VERSION) {
|
299 |
if (ret > 0) |
300 |
ret = -EINVAL; |
301 |
fprintf(stderr, "kvm version too old\n");
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302 |
goto err;
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303 |
} |
304 |
|
305 |
if (ret > KVM_API_VERSION) {
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306 |
ret = -EINVAL; |
307 |
fprintf(stderr, "kvm version not supported\n");
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308 |
goto err;
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309 |
} |
310 |
|
311 |
s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
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312 |
if (s->vmfd < 0) |
313 |
goto err;
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314 |
|
315 |
/* initially, KVM allocated its own memory and we had to jump through
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316 |
* hooks to make phys_ram_base point to this. Modern versions of KVM
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317 |
* just use a user allocated buffer so we can use phys_ram_base
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318 |
* unmodified. Make sure we have a sufficiently modern version of KVM.
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319 |
*/
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320 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY); |
321 |
if (ret <= 0) { |
322 |
if (ret == 0) |
323 |
ret = -EINVAL; |
324 |
fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n");
|
325 |
goto err;
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326 |
} |
327 |
|
328 |
/* There was a nasty bug in < kvm-80 that prevents memory slots from being
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329 |
* destroyed properly. Since we rely on this capability, refuse to work
|
330 |
* with any kernel without this capability. */
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331 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, |
332 |
KVM_CAP_DESTROY_MEMORY_REGION_WORKS); |
333 |
if (ret <= 0) { |
334 |
if (ret == 0) |
335 |
ret = -EINVAL; |
336 |
|
337 |
fprintf(stderr, |
338 |
"KVM kernel module broken (DESTROY_MEMORY_REGION)\n"
|
339 |
"Please upgrade to at least kvm-81.\n");
|
340 |
goto err;
|
341 |
} |
342 |
|
343 |
s->coalesced_mmio = 0;
|
344 |
#ifdef KVM_CAP_COALESCED_MMIO
|
345 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_COALESCED_MMIO); |
346 |
if (ret > 0) |
347 |
s->coalesced_mmio = ret; |
348 |
#endif
|
349 |
|
350 |
ret = kvm_arch_init(s, smp_cpus); |
351 |
if (ret < 0) |
352 |
goto err;
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353 |
|
354 |
kvm_state = s; |
355 |
|
356 |
return 0; |
357 |
|
358 |
err:
|
359 |
if (s) {
|
360 |
if (s->vmfd != -1) |
361 |
close(s->vmfd); |
362 |
if (s->fd != -1) |
363 |
close(s->fd); |
364 |
} |
365 |
qemu_free(s); |
366 |
|
367 |
return ret;
|
368 |
} |
369 |
|
370 |
static int kvm_handle_io(CPUState *env, uint16_t port, void *data, |
371 |
int direction, int size, uint32_t count) |
372 |
{ |
373 |
int i;
|
374 |
uint8_t *ptr = data; |
375 |
|
376 |
for (i = 0; i < count; i++) { |
377 |
if (direction == KVM_EXIT_IO_IN) {
|
378 |
switch (size) {
|
379 |
case 1: |
380 |
stb_p(ptr, cpu_inb(env, port)); |
381 |
break;
|
382 |
case 2: |
383 |
stw_p(ptr, cpu_inw(env, port)); |
384 |
break;
|
385 |
case 4: |
386 |
stl_p(ptr, cpu_inl(env, port)); |
387 |
break;
|
388 |
} |
389 |
} else {
|
390 |
switch (size) {
|
391 |
case 1: |
392 |
cpu_outb(env, port, ldub_p(ptr)); |
393 |
break;
|
394 |
case 2: |
395 |
cpu_outw(env, port, lduw_p(ptr)); |
396 |
break;
|
397 |
case 4: |
398 |
cpu_outl(env, port, ldl_p(ptr)); |
399 |
break;
|
400 |
} |
401 |
} |
402 |
|
403 |
ptr += size; |
404 |
} |
405 |
|
406 |
return 1; |
407 |
} |
408 |
|
409 |
static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run) |
410 |
{ |
411 |
#ifdef KVM_CAP_COALESCED_MMIO
|
412 |
KVMState *s = kvm_state; |
413 |
if (s->coalesced_mmio) {
|
414 |
struct kvm_coalesced_mmio_ring *ring;
|
415 |
|
416 |
ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE);
|
417 |
while (ring->first != ring->last) {
|
418 |
struct kvm_coalesced_mmio *ent;
|
419 |
|
420 |
ent = &ring->coalesced_mmio[ring->first]; |
421 |
|
422 |
cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); |
423 |
/* FIXME smp_wmb() */
|
424 |
ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
|
425 |
} |
426 |
} |
427 |
#endif
|
428 |
} |
429 |
|
430 |
int kvm_cpu_exec(CPUState *env)
|
431 |
{ |
432 |
struct kvm_run *run = env->kvm_run;
|
433 |
int ret;
|
434 |
|
435 |
dprintf("kvm_cpu_exec()\n");
|
436 |
|
437 |
do {
|
438 |
kvm_arch_pre_run(env, run); |
439 |
|
440 |
if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
|
441 |
dprintf("interrupt exit requested\n");
|
442 |
ret = 0;
|
443 |
break;
|
444 |
} |
445 |
|
446 |
ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
|
447 |
kvm_arch_post_run(env, run); |
448 |
|
449 |
if (ret == -EINTR || ret == -EAGAIN) {
|
450 |
dprintf("io window exit\n");
|
451 |
ret = 0;
|
452 |
break;
|
453 |
} |
454 |
|
455 |
if (ret < 0) { |
456 |
dprintf("kvm run failed %s\n", strerror(-ret));
|
457 |
abort(); |
458 |
} |
459 |
|
460 |
kvm_run_coalesced_mmio(env, run); |
461 |
|
462 |
ret = 0; /* exit loop */ |
463 |
switch (run->exit_reason) {
|
464 |
case KVM_EXIT_IO:
|
465 |
dprintf("handle_io\n");
|
466 |
ret = kvm_handle_io(env, run->io.port, |
467 |
(uint8_t *)run + run->io.data_offset, |
468 |
run->io.direction, |
469 |
run->io.size, |
470 |
run->io.count); |
471 |
break;
|
472 |
case KVM_EXIT_MMIO:
|
473 |
dprintf("handle_mmio\n");
|
474 |
cpu_physical_memory_rw(run->mmio.phys_addr, |
475 |
run->mmio.data, |
476 |
run->mmio.len, |
477 |
run->mmio.is_write); |
478 |
ret = 1;
|
479 |
break;
|
480 |
case KVM_EXIT_IRQ_WINDOW_OPEN:
|
481 |
dprintf("irq_window_open\n");
|
482 |
break;
|
483 |
case KVM_EXIT_SHUTDOWN:
|
484 |
dprintf("shutdown\n");
|
485 |
qemu_system_reset_request(); |
486 |
ret = 1;
|
487 |
break;
|
488 |
case KVM_EXIT_UNKNOWN:
|
489 |
dprintf("kvm_exit_unknown\n");
|
490 |
break;
|
491 |
case KVM_EXIT_FAIL_ENTRY:
|
492 |
dprintf("kvm_exit_fail_entry\n");
|
493 |
break;
|
494 |
case KVM_EXIT_EXCEPTION:
|
495 |
dprintf("kvm_exit_exception\n");
|
496 |
break;
|
497 |
case KVM_EXIT_DEBUG:
|
498 |
dprintf("kvm_exit_debug\n");
|
499 |
break;
|
500 |
default:
|
501 |
dprintf("kvm_arch_handle_exit\n");
|
502 |
ret = kvm_arch_handle_exit(env, run); |
503 |
break;
|
504 |
} |
505 |
} while (ret > 0); |
506 |
|
507 |
if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
|
508 |
env->interrupt_request &= ~CPU_INTERRUPT_EXIT; |
509 |
env->exception_index = EXCP_INTERRUPT; |
510 |
} |
511 |
|
512 |
return ret;
|
513 |
} |
514 |
|
515 |
void kvm_set_phys_mem(target_phys_addr_t start_addr,
|
516 |
ram_addr_t size, |
517 |
ram_addr_t phys_offset) |
518 |
{ |
519 |
KVMState *s = kvm_state; |
520 |
ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; |
521 |
KVMSlot *mem; |
522 |
|
523 |
/* KVM does not support read-only slots */
|
524 |
phys_offset &= ~IO_MEM_ROM; |
525 |
|
526 |
mem = kvm_lookup_slot(s, start_addr); |
527 |
if (mem) {
|
528 |
if ((flags == IO_MEM_UNASSIGNED) || (flags >= TLB_MMIO)) {
|
529 |
mem->memory_size = 0;
|
530 |
mem->start_addr = start_addr; |
531 |
mem->phys_offset = 0;
|
532 |
mem->flags = 0;
|
533 |
|
534 |
kvm_set_user_memory_region(s, mem); |
535 |
} else if (start_addr >= mem->start_addr && |
536 |
(start_addr + size) <= (mem->start_addr + |
537 |
mem->memory_size)) { |
538 |
KVMSlot slot; |
539 |
target_phys_addr_t mem_start; |
540 |
ram_addr_t mem_size, mem_offset; |
541 |
|
542 |
/* Not splitting */
|
543 |
if ((phys_offset - (start_addr - mem->start_addr)) ==
|
544 |
mem->phys_offset) |
545 |
return;
|
546 |
|
547 |
/* unregister whole slot */
|
548 |
memcpy(&slot, mem, sizeof(slot));
|
549 |
mem->memory_size = 0;
|
550 |
kvm_set_user_memory_region(s, mem); |
551 |
|
552 |
/* register prefix slot */
|
553 |
mem_start = slot.start_addr; |
554 |
mem_size = start_addr - slot.start_addr; |
555 |
mem_offset = slot.phys_offset; |
556 |
if (mem_size)
|
557 |
kvm_set_phys_mem(mem_start, mem_size, mem_offset); |
558 |
|
559 |
/* register new slot */
|
560 |
kvm_set_phys_mem(start_addr, size, phys_offset); |
561 |
|
562 |
/* register suffix slot */
|
563 |
mem_start = start_addr + size; |
564 |
mem_offset += mem_size + size; |
565 |
mem_size = slot.memory_size - mem_size - size; |
566 |
if (mem_size)
|
567 |
kvm_set_phys_mem(mem_start, mem_size, mem_offset); |
568 |
|
569 |
return;
|
570 |
} else {
|
571 |
printf("Registering overlapping slot\n");
|
572 |
abort(); |
573 |
} |
574 |
} |
575 |
/* KVM does not need to know about this memory */
|
576 |
if (flags >= IO_MEM_UNASSIGNED)
|
577 |
return;
|
578 |
|
579 |
mem = kvm_alloc_slot(s); |
580 |
mem->memory_size = size; |
581 |
mem->start_addr = start_addr; |
582 |
mem->phys_offset = phys_offset; |
583 |
mem->flags = 0;
|
584 |
|
585 |
kvm_set_user_memory_region(s, mem); |
586 |
/* FIXME deal with errors */
|
587 |
} |
588 |
|
589 |
int kvm_ioctl(KVMState *s, int type, ...) |
590 |
{ |
591 |
int ret;
|
592 |
void *arg;
|
593 |
va_list ap; |
594 |
|
595 |
va_start(ap, type); |
596 |
arg = va_arg(ap, void *);
|
597 |
va_end(ap); |
598 |
|
599 |
ret = ioctl(s->fd, type, arg); |
600 |
if (ret == -1) |
601 |
ret = -errno; |
602 |
|
603 |
return ret;
|
604 |
} |
605 |
|
606 |
int kvm_vm_ioctl(KVMState *s, int type, ...) |
607 |
{ |
608 |
int ret;
|
609 |
void *arg;
|
610 |
va_list ap; |
611 |
|
612 |
va_start(ap, type); |
613 |
arg = va_arg(ap, void *);
|
614 |
va_end(ap); |
615 |
|
616 |
ret = ioctl(s->vmfd, type, arg); |
617 |
if (ret == -1) |
618 |
ret = -errno; |
619 |
|
620 |
return ret;
|
621 |
} |
622 |
|
623 |
int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
624 |
{ |
625 |
int ret;
|
626 |
void *arg;
|
627 |
va_list ap; |
628 |
|
629 |
va_start(ap, type); |
630 |
arg = va_arg(ap, void *);
|
631 |
va_end(ap); |
632 |
|
633 |
ret = ioctl(env->kvm_fd, type, arg); |
634 |
if (ret == -1) |
635 |
ret = -errno; |
636 |
|
637 |
return ret;
|
638 |
} |
639 |
|
640 |
int kvm_has_sync_mmu(void) |
641 |
{ |
642 |
KVMState *s = kvm_state; |
643 |
|
644 |
#ifdef KVM_CAP_SYNC_MMU
|
645 |
if (kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_SYNC_MMU) > 0) |
646 |
return 1; |
647 |
#endif
|
648 |
|
649 |
return 0; |
650 |
} |