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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 "hw/hw.h" |
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#include "gdbstub.h" |
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#include "kvm.h" |
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|
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/* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */
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#define PAGE_SIZE TARGET_PAGE_SIZE
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//#define DEBUG_KVM
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#ifdef DEBUG_KVM
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#define dprintf(fmt, ...) \
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do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) |
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#else
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#define dprintf(fmt, ...) \
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do { } while (0) |
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#endif
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typedef struct KVMSlot |
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{ |
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target_phys_addr_t start_addr; |
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ram_addr_t memory_size; |
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ram_addr_t phys_offset; |
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int slot;
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int flags;
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} KVMSlot; |
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|
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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 regs_modified;
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int coalesced_mmio;
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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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#ifdef KVM_CAP_SET_GUEST_DEBUG
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struct kvm_sw_breakpoint_head kvm_sw_breakpoints;
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#endif
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int irqchip_in_kernel;
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int pit_in_kernel;
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}; |
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static KVMState *kvm_state;
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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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|
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fprintf(stderr, "%s: no free slot available\n", __func__);
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abort(); |
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} |
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|
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static KVMSlot *kvm_lookup_matching_slot(KVMState *s,
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target_phys_addr_t start_addr, |
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target_phys_addr_t end_addr) |
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{ |
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int i;
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|
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for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
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KVMSlot *mem = &s->slots[i]; |
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|
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if (start_addr == mem->start_addr &&
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end_addr == mem->start_addr + mem->memory_size) { |
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return mem;
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} |
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} |
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return NULL; |
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} |
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|
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/*
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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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|
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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 (mem->memory_size == 0 || |
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(found && found->start_addr < mem->start_addr)) { |
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continue;
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} |
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|
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if (end_addr > mem->start_addr &&
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start_addr < mem->start_addr + mem->memory_size) { |
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found = mem; |
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} |
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} |
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return found;
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} |
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|
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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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|
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mem.slot = slot->slot; |
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mem.guest_phys_addr = slot->start_addr; |
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mem.memory_size = slot->memory_size; |
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mem.userspace_addr = (unsigned long)qemu_get_ram_ptr(slot->phys_offset); |
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mem.flags = slot->flags; |
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if (s->migration_log) {
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mem.flags |= KVM_MEM_LOG_DIRTY_PAGES; |
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} |
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return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
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} |
149 |
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static void kvm_reset_vcpu(void *opaque) |
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{ |
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CPUState *env = opaque; |
153 |
|
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kvm_arch_reset_vcpu(env); |
155 |
if (kvm_arch_put_registers(env)) {
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fprintf(stderr, "Fatal: kvm vcpu reset failed\n");
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abort(); |
158 |
} |
159 |
} |
160 |
|
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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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} |
165 |
|
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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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} |
170 |
|
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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); |
181 |
if (ret < 0) { |
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dprintf("kvm_create_vcpu failed\n");
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goto err;
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} |
185 |
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env->kvm_fd = ret; |
187 |
env->kvm_state = s; |
188 |
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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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} |
194 |
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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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} |
202 |
|
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ret = kvm_arch_init_vcpu(env); |
204 |
if (ret == 0) { |
205 |
qemu_register_reset(kvm_reset_vcpu, env); |
206 |
kvm_arch_reset_vcpu(env); |
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ret = kvm_arch_put_registers(env); |
208 |
} |
209 |
err:
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return ret;
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} |
212 |
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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); |
221 |
int old_flags;
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if (mem == NULL) { |
224 |
fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-" |
225 |
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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} |
229 |
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old_flags = mem->flags; |
231 |
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flags = (mem->flags & ~mask) | flags; |
233 |
mem->flags = flags; |
234 |
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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; |
238 |
} |
239 |
if (flags == old_flags) {
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return 0; |
241 |
} |
242 |
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return kvm_set_user_memory_region(s, mem);
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} |
245 |
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int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size)
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{ |
248 |
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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} |
252 |
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int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size)
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{ |
255 |
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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} |
259 |
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int kvm_set_migration_log(int enable) |
261 |
{ |
262 |
KVMState *s = kvm_state; |
263 |
KVMSlot *mem; |
264 |
int i, err;
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s->migration_log = enable; |
267 |
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for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
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mem = &s->slots[i]; |
270 |
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if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {
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continue;
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} |
274 |
err = kvm_set_user_memory_region(s, mem); |
275 |
if (err) {
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return err;
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} |
278 |
} |
279 |
return 0; |
280 |
} |
281 |
|
282 |
static int test_le_bit(unsigned long nr, unsigned char *addr) |
283 |
{ |
284 |
return (addr[nr >> 3] >> (nr & 7)) & 1; |
285 |
} |
286 |
|
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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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int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr,
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target_phys_addr_t end_addr) |
297 |
{ |
298 |
KVMState *s = kvm_state; |
299 |
unsigned long size, allocated_size = 0; |
300 |
target_phys_addr_t phys_addr; |
301 |
ram_addr_t addr; |
302 |
KVMDirtyLog d; |
303 |
KVMSlot *mem; |
304 |
int ret = 0; |
305 |
|
306 |
d.dirty_bitmap = NULL;
|
307 |
while (start_addr < end_addr) {
|
308 |
mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr); |
309 |
if (mem == NULL) { |
310 |
break;
|
311 |
} |
312 |
|
313 |
size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8; |
314 |
if (!d.dirty_bitmap) {
|
315 |
d.dirty_bitmap = qemu_malloc(size); |
316 |
} else if (size > allocated_size) { |
317 |
d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size); |
318 |
} |
319 |
allocated_size = size; |
320 |
memset(d.dirty_bitmap, 0, allocated_size);
|
321 |
|
322 |
d.slot = mem->slot; |
323 |
|
324 |
if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) { |
325 |
dprintf("ioctl failed %d\n", errno);
|
326 |
ret = -1;
|
327 |
break;
|
328 |
} |
329 |
|
330 |
for (phys_addr = mem->start_addr, addr = mem->phys_offset;
|
331 |
phys_addr < mem->start_addr + mem->memory_size; |
332 |
phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) { |
333 |
unsigned char *bitmap = (unsigned char *)d.dirty_bitmap; |
334 |
unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS;
|
335 |
|
336 |
if (test_le_bit(nr, bitmap)) {
|
337 |
cpu_physical_memory_set_dirty(addr); |
338 |
} |
339 |
} |
340 |
start_addr = phys_addr; |
341 |
} |
342 |
qemu_free(d.dirty_bitmap); |
343 |
|
344 |
return ret;
|
345 |
} |
346 |
|
347 |
int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
|
348 |
{ |
349 |
int ret = -ENOSYS;
|
350 |
#ifdef KVM_CAP_COALESCED_MMIO
|
351 |
KVMState *s = kvm_state; |
352 |
|
353 |
if (s->coalesced_mmio) {
|
354 |
struct kvm_coalesced_mmio_zone zone;
|
355 |
|
356 |
zone.addr = start; |
357 |
zone.size = size; |
358 |
|
359 |
ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); |
360 |
} |
361 |
#endif
|
362 |
|
363 |
return ret;
|
364 |
} |
365 |
|
366 |
int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
|
367 |
{ |
368 |
int ret = -ENOSYS;
|
369 |
#ifdef KVM_CAP_COALESCED_MMIO
|
370 |
KVMState *s = kvm_state; |
371 |
|
372 |
if (s->coalesced_mmio) {
|
373 |
struct kvm_coalesced_mmio_zone zone;
|
374 |
|
375 |
zone.addr = start; |
376 |
zone.size = size; |
377 |
|
378 |
ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); |
379 |
} |
380 |
#endif
|
381 |
|
382 |
return ret;
|
383 |
} |
384 |
|
385 |
int kvm_check_extension(KVMState *s, unsigned int extension) |
386 |
{ |
387 |
int ret;
|
388 |
|
389 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension); |
390 |
if (ret < 0) { |
391 |
ret = 0;
|
392 |
} |
393 |
|
394 |
return ret;
|
395 |
} |
396 |
|
397 |
int kvm_init(int smp_cpus) |
398 |
{ |
399 |
static const char upgrade_note[] = |
400 |
"Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
|
401 |
"(see http://sourceforge.net/projects/kvm).\n";
|
402 |
KVMState *s; |
403 |
int ret;
|
404 |
int i;
|
405 |
|
406 |
if (smp_cpus > 1) { |
407 |
fprintf(stderr, "No SMP KVM support, use '-smp 1'\n");
|
408 |
return -EINVAL;
|
409 |
} |
410 |
|
411 |
s = qemu_mallocz(sizeof(KVMState));
|
412 |
|
413 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
414 |
QTAILQ_INIT(&s->kvm_sw_breakpoints); |
415 |
#endif
|
416 |
for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
417 |
s->slots[i].slot = i; |
418 |
|
419 |
s->vmfd = -1;
|
420 |
s->fd = qemu_open("/dev/kvm", O_RDWR);
|
421 |
if (s->fd == -1) { |
422 |
fprintf(stderr, "Could not access KVM kernel module: %m\n");
|
423 |
ret = -errno; |
424 |
goto err;
|
425 |
} |
426 |
|
427 |
ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
|
428 |
if (ret < KVM_API_VERSION) {
|
429 |
if (ret > 0) |
430 |
ret = -EINVAL; |
431 |
fprintf(stderr, "kvm version too old\n");
|
432 |
goto err;
|
433 |
} |
434 |
|
435 |
if (ret > KVM_API_VERSION) {
|
436 |
ret = -EINVAL; |
437 |
fprintf(stderr, "kvm version not supported\n");
|
438 |
goto err;
|
439 |
} |
440 |
|
441 |
s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
|
442 |
if (s->vmfd < 0) |
443 |
goto err;
|
444 |
|
445 |
/* initially, KVM allocated its own memory and we had to jump through
|
446 |
* hooks to make phys_ram_base point to this. Modern versions of KVM
|
447 |
* just use a user allocated buffer so we can use regular pages
|
448 |
* unmodified. Make sure we have a sufficiently modern version of KVM.
|
449 |
*/
|
450 |
if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) {
|
451 |
ret = -EINVAL; |
452 |
fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s",
|
453 |
upgrade_note); |
454 |
goto err;
|
455 |
} |
456 |
|
457 |
/* There was a nasty bug in < kvm-80 that prevents memory slots from being
|
458 |
* destroyed properly. Since we rely on this capability, refuse to work
|
459 |
* with any kernel without this capability. */
|
460 |
if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) {
|
461 |
ret = -EINVAL; |
462 |
|
463 |
fprintf(stderr, |
464 |
"KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s",
|
465 |
upgrade_note); |
466 |
goto err;
|
467 |
} |
468 |
|
469 |
#ifdef KVM_CAP_COALESCED_MMIO
|
470 |
s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); |
471 |
#else
|
472 |
s->coalesced_mmio = 0;
|
473 |
#endif
|
474 |
|
475 |
s->broken_set_mem_region = 1;
|
476 |
#ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
|
477 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS); |
478 |
if (ret > 0) { |
479 |
s->broken_set_mem_region = 0;
|
480 |
} |
481 |
#endif
|
482 |
|
483 |
s->vcpu_events = 0;
|
484 |
#ifdef KVM_CAP_VCPU_EVENTS
|
485 |
s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS); |
486 |
#endif
|
487 |
|
488 |
ret = kvm_arch_init(s, smp_cpus); |
489 |
if (ret < 0) |
490 |
goto err;
|
491 |
|
492 |
kvm_state = s; |
493 |
|
494 |
return 0; |
495 |
|
496 |
err:
|
497 |
if (s) {
|
498 |
if (s->vmfd != -1) |
499 |
close(s->vmfd); |
500 |
if (s->fd != -1) |
501 |
close(s->fd); |
502 |
} |
503 |
qemu_free(s); |
504 |
|
505 |
return ret;
|
506 |
} |
507 |
|
508 |
static int kvm_handle_io(uint16_t port, void *data, int direction, int size, |
509 |
uint32_t count) |
510 |
{ |
511 |
int i;
|
512 |
uint8_t *ptr = data; |
513 |
|
514 |
for (i = 0; i < count; i++) { |
515 |
if (direction == KVM_EXIT_IO_IN) {
|
516 |
switch (size) {
|
517 |
case 1: |
518 |
stb_p(ptr, cpu_inb(port)); |
519 |
break;
|
520 |
case 2: |
521 |
stw_p(ptr, cpu_inw(port)); |
522 |
break;
|
523 |
case 4: |
524 |
stl_p(ptr, cpu_inl(port)); |
525 |
break;
|
526 |
} |
527 |
} else {
|
528 |
switch (size) {
|
529 |
case 1: |
530 |
cpu_outb(port, ldub_p(ptr)); |
531 |
break;
|
532 |
case 2: |
533 |
cpu_outw(port, lduw_p(ptr)); |
534 |
break;
|
535 |
case 4: |
536 |
cpu_outl(port, ldl_p(ptr)); |
537 |
break;
|
538 |
} |
539 |
} |
540 |
|
541 |
ptr += size; |
542 |
} |
543 |
|
544 |
return 1; |
545 |
} |
546 |
|
547 |
static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run) |
548 |
{ |
549 |
#ifdef KVM_CAP_COALESCED_MMIO
|
550 |
KVMState *s = kvm_state; |
551 |
if (s->coalesced_mmio) {
|
552 |
struct kvm_coalesced_mmio_ring *ring;
|
553 |
|
554 |
ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE);
|
555 |
while (ring->first != ring->last) {
|
556 |
struct kvm_coalesced_mmio *ent;
|
557 |
|
558 |
ent = &ring->coalesced_mmio[ring->first]; |
559 |
|
560 |
cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); |
561 |
/* FIXME smp_wmb() */
|
562 |
ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
|
563 |
} |
564 |
} |
565 |
#endif
|
566 |
} |
567 |
|
568 |
void kvm_cpu_synchronize_state(CPUState *env)
|
569 |
{ |
570 |
if (!env->kvm_state->regs_modified) {
|
571 |
kvm_arch_get_registers(env); |
572 |
env->kvm_state->regs_modified = 1;
|
573 |
} |
574 |
} |
575 |
|
576 |
int kvm_cpu_exec(CPUState *env)
|
577 |
{ |
578 |
struct kvm_run *run = env->kvm_run;
|
579 |
int ret;
|
580 |
|
581 |
dprintf("kvm_cpu_exec()\n");
|
582 |
|
583 |
do {
|
584 |
if (env->exit_request) {
|
585 |
dprintf("interrupt exit requested\n");
|
586 |
ret = 0;
|
587 |
break;
|
588 |
} |
589 |
|
590 |
if (env->kvm_state->regs_modified) {
|
591 |
kvm_arch_put_registers(env); |
592 |
env->kvm_state->regs_modified = 0;
|
593 |
} |
594 |
|
595 |
kvm_arch_pre_run(env, run); |
596 |
qemu_mutex_unlock_iothread(); |
597 |
ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
|
598 |
qemu_mutex_lock_iothread(); |
599 |
kvm_arch_post_run(env, run); |
600 |
|
601 |
if (ret == -EINTR || ret == -EAGAIN) {
|
602 |
dprintf("io window exit\n");
|
603 |
ret = 0;
|
604 |
break;
|
605 |
} |
606 |
|
607 |
if (ret < 0) { |
608 |
dprintf("kvm run failed %s\n", strerror(-ret));
|
609 |
abort(); |
610 |
} |
611 |
|
612 |
kvm_run_coalesced_mmio(env, run); |
613 |
|
614 |
ret = 0; /* exit loop */ |
615 |
switch (run->exit_reason) {
|
616 |
case KVM_EXIT_IO:
|
617 |
dprintf("handle_io\n");
|
618 |
ret = kvm_handle_io(run->io.port, |
619 |
(uint8_t *)run + run->io.data_offset, |
620 |
run->io.direction, |
621 |
run->io.size, |
622 |
run->io.count); |
623 |
break;
|
624 |
case KVM_EXIT_MMIO:
|
625 |
dprintf("handle_mmio\n");
|
626 |
cpu_physical_memory_rw(run->mmio.phys_addr, |
627 |
run->mmio.data, |
628 |
run->mmio.len, |
629 |
run->mmio.is_write); |
630 |
ret = 1;
|
631 |
break;
|
632 |
case KVM_EXIT_IRQ_WINDOW_OPEN:
|
633 |
dprintf("irq_window_open\n");
|
634 |
break;
|
635 |
case KVM_EXIT_SHUTDOWN:
|
636 |
dprintf("shutdown\n");
|
637 |
qemu_system_reset_request(); |
638 |
ret = 1;
|
639 |
break;
|
640 |
case KVM_EXIT_UNKNOWN:
|
641 |
dprintf("kvm_exit_unknown\n");
|
642 |
break;
|
643 |
case KVM_EXIT_FAIL_ENTRY:
|
644 |
dprintf("kvm_exit_fail_entry\n");
|
645 |
break;
|
646 |
case KVM_EXIT_EXCEPTION:
|
647 |
dprintf("kvm_exit_exception\n");
|
648 |
break;
|
649 |
case KVM_EXIT_DEBUG:
|
650 |
dprintf("kvm_exit_debug\n");
|
651 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
652 |
if (kvm_arch_debug(&run->debug.arch)) {
|
653 |
gdb_set_stop_cpu(env); |
654 |
vm_stop(EXCP_DEBUG); |
655 |
env->exception_index = EXCP_DEBUG; |
656 |
return 0; |
657 |
} |
658 |
/* re-enter, this exception was guest-internal */
|
659 |
ret = 1;
|
660 |
#endif /* KVM_CAP_SET_GUEST_DEBUG */ |
661 |
break;
|
662 |
default:
|
663 |
dprintf("kvm_arch_handle_exit\n");
|
664 |
ret = kvm_arch_handle_exit(env, run); |
665 |
break;
|
666 |
} |
667 |
} while (ret > 0); |
668 |
|
669 |
if (env->exit_request) {
|
670 |
env->exit_request = 0;
|
671 |
env->exception_index = EXCP_INTERRUPT; |
672 |
} |
673 |
|
674 |
return ret;
|
675 |
} |
676 |
|
677 |
void kvm_set_phys_mem(target_phys_addr_t start_addr,
|
678 |
ram_addr_t size, |
679 |
ram_addr_t phys_offset) |
680 |
{ |
681 |
KVMState *s = kvm_state; |
682 |
ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; |
683 |
KVMSlot *mem, old; |
684 |
int err;
|
685 |
|
686 |
if (start_addr & ~TARGET_PAGE_MASK) {
|
687 |
if (flags >= IO_MEM_UNASSIGNED) {
|
688 |
if (!kvm_lookup_overlapping_slot(s, start_addr,
|
689 |
start_addr + size)) { |
690 |
return;
|
691 |
} |
692 |
fprintf(stderr, "Unaligned split of a KVM memory slot\n");
|
693 |
} else {
|
694 |
fprintf(stderr, "Only page-aligned memory slots supported\n");
|
695 |
} |
696 |
abort(); |
697 |
} |
698 |
|
699 |
/* KVM does not support read-only slots */
|
700 |
phys_offset &= ~IO_MEM_ROM; |
701 |
|
702 |
while (1) { |
703 |
mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size); |
704 |
if (!mem) {
|
705 |
break;
|
706 |
} |
707 |
|
708 |
if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr &&
|
709 |
(start_addr + size <= mem->start_addr + mem->memory_size) && |
710 |
(phys_offset - start_addr == mem->phys_offset - mem->start_addr)) { |
711 |
/* The new slot fits into the existing one and comes with
|
712 |
* identical parameters - nothing to be done. */
|
713 |
return;
|
714 |
} |
715 |
|
716 |
old = *mem; |
717 |
|
718 |
/* unregister the overlapping slot */
|
719 |
mem->memory_size = 0;
|
720 |
err = kvm_set_user_memory_region(s, mem); |
721 |
if (err) {
|
722 |
fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
|
723 |
__func__, strerror(-err)); |
724 |
abort(); |
725 |
} |
726 |
|
727 |
/* Workaround for older KVM versions: we can't join slots, even not by
|
728 |
* unregistering the previous ones and then registering the larger
|
729 |
* slot. We have to maintain the existing fragmentation. Sigh.
|
730 |
*
|
731 |
* This workaround assumes that the new slot starts at the same
|
732 |
* address as the first existing one. If not or if some overlapping
|
733 |
* slot comes around later, we will fail (not seen in practice so far)
|
734 |
* - and actually require a recent KVM version. */
|
735 |
if (s->broken_set_mem_region &&
|
736 |
old.start_addr == start_addr && old.memory_size < size && |
737 |
flags < IO_MEM_UNASSIGNED) { |
738 |
mem = kvm_alloc_slot(s); |
739 |
mem->memory_size = old.memory_size; |
740 |
mem->start_addr = old.start_addr; |
741 |
mem->phys_offset = old.phys_offset; |
742 |
mem->flags = 0;
|
743 |
|
744 |
err = kvm_set_user_memory_region(s, mem); |
745 |
if (err) {
|
746 |
fprintf(stderr, "%s: error updating slot: %s\n", __func__,
|
747 |
strerror(-err)); |
748 |
abort(); |
749 |
} |
750 |
|
751 |
start_addr += old.memory_size; |
752 |
phys_offset += old.memory_size; |
753 |
size -= old.memory_size; |
754 |
continue;
|
755 |
} |
756 |
|
757 |
/* register prefix slot */
|
758 |
if (old.start_addr < start_addr) {
|
759 |
mem = kvm_alloc_slot(s); |
760 |
mem->memory_size = start_addr - old.start_addr; |
761 |
mem->start_addr = old.start_addr; |
762 |
mem->phys_offset = old.phys_offset; |
763 |
mem->flags = 0;
|
764 |
|
765 |
err = kvm_set_user_memory_region(s, mem); |
766 |
if (err) {
|
767 |
fprintf(stderr, "%s: error registering prefix slot: %s\n",
|
768 |
__func__, strerror(-err)); |
769 |
abort(); |
770 |
} |
771 |
} |
772 |
|
773 |
/* register suffix slot */
|
774 |
if (old.start_addr + old.memory_size > start_addr + size) {
|
775 |
ram_addr_t size_delta; |
776 |
|
777 |
mem = kvm_alloc_slot(s); |
778 |
mem->start_addr = start_addr + size; |
779 |
size_delta = mem->start_addr - old.start_addr; |
780 |
mem->memory_size = old.memory_size - size_delta; |
781 |
mem->phys_offset = old.phys_offset + size_delta; |
782 |
mem->flags = 0;
|
783 |
|
784 |
err = kvm_set_user_memory_region(s, mem); |
785 |
if (err) {
|
786 |
fprintf(stderr, "%s: error registering suffix slot: %s\n",
|
787 |
__func__, strerror(-err)); |
788 |
abort(); |
789 |
} |
790 |
} |
791 |
} |
792 |
|
793 |
/* in case the KVM bug workaround already "consumed" the new slot */
|
794 |
if (!size)
|
795 |
return;
|
796 |
|
797 |
/* KVM does not need to know about this memory */
|
798 |
if (flags >= IO_MEM_UNASSIGNED)
|
799 |
return;
|
800 |
|
801 |
mem = kvm_alloc_slot(s); |
802 |
mem->memory_size = size; |
803 |
mem->start_addr = start_addr; |
804 |
mem->phys_offset = phys_offset; |
805 |
mem->flags = 0;
|
806 |
|
807 |
err = kvm_set_user_memory_region(s, mem); |
808 |
if (err) {
|
809 |
fprintf(stderr, "%s: error registering slot: %s\n", __func__,
|
810 |
strerror(-err)); |
811 |
abort(); |
812 |
} |
813 |
} |
814 |
|
815 |
int kvm_ioctl(KVMState *s, int type, ...) |
816 |
{ |
817 |
int ret;
|
818 |
void *arg;
|
819 |
va_list ap; |
820 |
|
821 |
va_start(ap, type); |
822 |
arg = va_arg(ap, void *);
|
823 |
va_end(ap); |
824 |
|
825 |
ret = ioctl(s->fd, type, arg); |
826 |
if (ret == -1) |
827 |
ret = -errno; |
828 |
|
829 |
return ret;
|
830 |
} |
831 |
|
832 |
int kvm_vm_ioctl(KVMState *s, int type, ...) |
833 |
{ |
834 |
int ret;
|
835 |
void *arg;
|
836 |
va_list ap; |
837 |
|
838 |
va_start(ap, type); |
839 |
arg = va_arg(ap, void *);
|
840 |
va_end(ap); |
841 |
|
842 |
ret = ioctl(s->vmfd, type, arg); |
843 |
if (ret == -1) |
844 |
ret = -errno; |
845 |
|
846 |
return ret;
|
847 |
} |
848 |
|
849 |
int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
850 |
{ |
851 |
int ret;
|
852 |
void *arg;
|
853 |
va_list ap; |
854 |
|
855 |
va_start(ap, type); |
856 |
arg = va_arg(ap, void *);
|
857 |
va_end(ap); |
858 |
|
859 |
ret = ioctl(env->kvm_fd, type, arg); |
860 |
if (ret == -1) |
861 |
ret = -errno; |
862 |
|
863 |
return ret;
|
864 |
} |
865 |
|
866 |
int kvm_has_sync_mmu(void) |
867 |
{ |
868 |
#ifdef KVM_CAP_SYNC_MMU
|
869 |
KVMState *s = kvm_state; |
870 |
|
871 |
return kvm_check_extension(s, KVM_CAP_SYNC_MMU);
|
872 |
#else
|
873 |
return 0; |
874 |
#endif
|
875 |
} |
876 |
|
877 |
int kvm_has_vcpu_events(void) |
878 |
{ |
879 |
return kvm_state->vcpu_events;
|
880 |
} |
881 |
|
882 |
void kvm_setup_guest_memory(void *start, size_t size) |
883 |
{ |
884 |
if (!kvm_has_sync_mmu()) {
|
885 |
#ifdef MADV_DONTFORK
|
886 |
int ret = madvise(start, size, MADV_DONTFORK);
|
887 |
|
888 |
if (ret) {
|
889 |
perror("madvice");
|
890 |
exit(1);
|
891 |
} |
892 |
#else
|
893 |
fprintf(stderr, |
894 |
"Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
|
895 |
exit(1);
|
896 |
#endif
|
897 |
} |
898 |
} |
899 |
|
900 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
901 |
static void on_vcpu(CPUState *env, void (*func)(void *data), void *data) |
902 |
{ |
903 |
#ifdef CONFIG_IOTHREAD
|
904 |
if (env == cpu_single_env) {
|
905 |
func(data); |
906 |
return;
|
907 |
} |
908 |
abort(); |
909 |
#else
|
910 |
func(data); |
911 |
#endif
|
912 |
} |
913 |
|
914 |
struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env,
|
915 |
target_ulong pc) |
916 |
{ |
917 |
struct kvm_sw_breakpoint *bp;
|
918 |
|
919 |
QTAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) { |
920 |
if (bp->pc == pc)
|
921 |
return bp;
|
922 |
} |
923 |
return NULL; |
924 |
} |
925 |
|
926 |
int kvm_sw_breakpoints_active(CPUState *env)
|
927 |
{ |
928 |
return !QTAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
|
929 |
} |
930 |
|
931 |
struct kvm_set_guest_debug_data {
|
932 |
struct kvm_guest_debug dbg;
|
933 |
CPUState *env; |
934 |
int err;
|
935 |
}; |
936 |
|
937 |
static void kvm_invoke_set_guest_debug(void *data) |
938 |
{ |
939 |
struct kvm_set_guest_debug_data *dbg_data = data;
|
940 |
CPUState *env = dbg_data->env; |
941 |
|
942 |
if (env->kvm_state->regs_modified) {
|
943 |
kvm_arch_put_registers(env); |
944 |
env->kvm_state->regs_modified = 0;
|
945 |
} |
946 |
dbg_data->err = kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg_data->dbg); |
947 |
} |
948 |
|
949 |
int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
950 |
{ |
951 |
struct kvm_set_guest_debug_data data;
|
952 |
|
953 |
data.dbg.control = 0;
|
954 |
if (env->singlestep_enabled)
|
955 |
data.dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; |
956 |
|
957 |
kvm_arch_update_guest_debug(env, &data.dbg); |
958 |
data.dbg.control |= reinject_trap; |
959 |
data.env = env; |
960 |
|
961 |
on_vcpu(env, kvm_invoke_set_guest_debug, &data); |
962 |
return data.err;
|
963 |
} |
964 |
|
965 |
int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
|
966 |
target_ulong len, int type)
|
967 |
{ |
968 |
struct kvm_sw_breakpoint *bp;
|
969 |
CPUState *env; |
970 |
int err;
|
971 |
|
972 |
if (type == GDB_BREAKPOINT_SW) {
|
973 |
bp = kvm_find_sw_breakpoint(current_env, addr); |
974 |
if (bp) {
|
975 |
bp->use_count++; |
976 |
return 0; |
977 |
} |
978 |
|
979 |
bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint)); |
980 |
if (!bp)
|
981 |
return -ENOMEM;
|
982 |
|
983 |
bp->pc = addr; |
984 |
bp->use_count = 1;
|
985 |
err = kvm_arch_insert_sw_breakpoint(current_env, bp); |
986 |
if (err) {
|
987 |
free(bp); |
988 |
return err;
|
989 |
} |
990 |
|
991 |
QTAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints, |
992 |
bp, entry); |
993 |
} else {
|
994 |
err = kvm_arch_insert_hw_breakpoint(addr, len, type); |
995 |
if (err)
|
996 |
return err;
|
997 |
} |
998 |
|
999 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1000 |
err = kvm_update_guest_debug(env, 0);
|
1001 |
if (err)
|
1002 |
return err;
|
1003 |
} |
1004 |
return 0; |
1005 |
} |
1006 |
|
1007 |
int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
|
1008 |
target_ulong len, int type)
|
1009 |
{ |
1010 |
struct kvm_sw_breakpoint *bp;
|
1011 |
CPUState *env; |
1012 |
int err;
|
1013 |
|
1014 |
if (type == GDB_BREAKPOINT_SW) {
|
1015 |
bp = kvm_find_sw_breakpoint(current_env, addr); |
1016 |
if (!bp)
|
1017 |
return -ENOENT;
|
1018 |
|
1019 |
if (bp->use_count > 1) { |
1020 |
bp->use_count--; |
1021 |
return 0; |
1022 |
} |
1023 |
|
1024 |
err = kvm_arch_remove_sw_breakpoint(current_env, bp); |
1025 |
if (err)
|
1026 |
return err;
|
1027 |
|
1028 |
QTAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry); |
1029 |
qemu_free(bp); |
1030 |
} else {
|
1031 |
err = kvm_arch_remove_hw_breakpoint(addr, len, type); |
1032 |
if (err)
|
1033 |
return err;
|
1034 |
} |
1035 |
|
1036 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1037 |
err = kvm_update_guest_debug(env, 0);
|
1038 |
if (err)
|
1039 |
return err;
|
1040 |
} |
1041 |
return 0; |
1042 |
} |
1043 |
|
1044 |
void kvm_remove_all_breakpoints(CPUState *current_env)
|
1045 |
{ |
1046 |
struct kvm_sw_breakpoint *bp, *next;
|
1047 |
KVMState *s = current_env->kvm_state; |
1048 |
CPUState *env; |
1049 |
|
1050 |
QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { |
1051 |
if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) { |
1052 |
/* Try harder to find a CPU that currently sees the breakpoint. */
|
1053 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
1054 |
if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) |
1055 |
break;
|
1056 |
} |
1057 |
} |
1058 |
} |
1059 |
kvm_arch_remove_all_hw_breakpoints(); |
1060 |
|
1061 |
for (env = first_cpu; env != NULL; env = env->next_cpu) |
1062 |
kvm_update_guest_debug(env, 0);
|
1063 |
} |
1064 |
|
1065 |
#else /* !KVM_CAP_SET_GUEST_DEBUG */ |
1066 |
|
1067 |
int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
1068 |
{ |
1069 |
return -EINVAL;
|
1070 |
} |
1071 |
|
1072 |
int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
|
1073 |
target_ulong len, int type)
|
1074 |
{ |
1075 |
return -EINVAL;
|
1076 |
} |
1077 |
|
1078 |
int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
|
1079 |
target_ulong len, int type)
|
1080 |
{ |
1081 |
return -EINVAL;
|
1082 |
} |
1083 |
|
1084 |
void kvm_remove_all_breakpoints(CPUState *current_env)
|
1085 |
{ |
1086 |
} |
1087 |
#endif /* !KVM_CAP_SET_GUEST_DEBUG */ |