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/*
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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 "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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|
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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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|
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typedef struct kvm_dirty_log KVMDirtyLog; |
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|
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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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#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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}; |
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static KVMState *kvm_state;
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|
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static KVMSlot *kvm_alloc_slot(KVMState *s)
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{ |
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int i;
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|
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for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
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/* KVM private memory slots */
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if (i >= 8 && i < 12) |
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continue;
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if (s->slots[i].memory_size == 0) |
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return &s->slots[i];
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} |
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|
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fprintf(stderr, "%s: no free slot available\n", __func__);
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abort(); |
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} |
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|
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static KVMSlot *kvm_lookup_matching_slot(KVMState *s,
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target_phys_addr_t start_addr, |
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target_phys_addr_t end_addr) |
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{ |
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int i;
|
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|
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for (i = 0; i < ARRAY_SIZE(s->slots); i++) { |
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KVMSlot *mem = &s->slots[i]; |
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|
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if (start_addr == mem->start_addr &&
|
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end_addr == mem->start_addr + mem->memory_size) { |
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return mem;
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} |
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} |
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|
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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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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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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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return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
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} |
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|
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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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|
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dprintf("kvm_init_vcpu\n");
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|
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ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index); |
151 |
if (ret < 0) { |
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dprintf("kvm_create_vcpu failed\n");
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goto err;
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} |
155 |
|
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env->kvm_fd = ret; |
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env->kvm_state = s; |
158 |
|
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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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} |
178 |
|
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int kvm_sync_vcpus(void) |
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{ |
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CPUState *env; |
182 |
|
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for (env = first_cpu; env != NULL; env = env->next_cpu) { |
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int ret;
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|
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ret = kvm_arch_put_registers(env); |
187 |
if (ret)
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return ret;
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} |
190 |
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return 0; |
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} |
193 |
|
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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, 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_matching_slot(s, phys_addr, phys_addr + size); |
203 |
if (mem == NULL) { |
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fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-" |
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TARGET_FMT_plx "\n", __func__, phys_addr,
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phys_addr + size - 1);
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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; |
214 |
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mem->flags = flags; |
216 |
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return kvm_set_user_memory_region(s, mem);
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} |
219 |
|
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int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size)
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{ |
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return kvm_dirty_pages_log_change(phys_addr, size,
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KVM_MEM_LOG_DIRTY_PAGES, |
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KVM_MEM_LOG_DIRTY_PAGES); |
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} |
226 |
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int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size)
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{ |
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return kvm_dirty_pages_log_change(phys_addr, size,
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0,
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KVM_MEM_LOG_DIRTY_PAGES); |
232 |
} |
233 |
|
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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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void kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr,
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target_phys_addr_t end_addr) |
244 |
{ |
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KVMState *s = kvm_state; |
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KVMDirtyLog d; |
247 |
KVMSlot *mem = kvm_lookup_matching_slot(s, start_addr, end_addr); |
248 |
unsigned long alloc_size; |
249 |
ram_addr_t addr; |
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target_phys_addr_t phys_addr = start_addr; |
251 |
|
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dprintf("sync addr: " TARGET_FMT_lx " into %lx\n", start_addr, |
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mem->phys_offset); |
254 |
if (mem == NULL) { |
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fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-" |
256 |
TARGET_FMT_plx "\n", __func__, phys_addr, end_addr - 1); |
257 |
return;
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} |
259 |
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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); |
262 |
|
263 |
d.slot = mem->slot; |
264 |
dprintf("slot %d, phys_addr %llx, uaddr: %llx\n",
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d.slot, mem->start_addr, mem->phys_offset); |
266 |
|
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if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) { |
268 |
dprintf("ioctl failed %d\n", errno);
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goto out;
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270 |
} |
271 |
|
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phys_addr = start_addr; |
273 |
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; |
275 |
unsigned nr = (phys_addr - start_addr) >> TARGET_PAGE_BITS;
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unsigned word = nr / (sizeof(*bitmap) * 8); |
277 |
unsigned bit = nr % (sizeof(*bitmap) * 8); |
278 |
if ((bitmap[word] >> bit) & 1) |
279 |
cpu_physical_memory_set_dirty(addr); |
280 |
} |
281 |
out:
|
282 |
qemu_free(d.dirty_bitmap); |
283 |
} |
284 |
|
285 |
int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
|
286 |
{ |
287 |
int ret = -ENOSYS;
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288 |
#ifdef KVM_CAP_COALESCED_MMIO
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289 |
KVMState *s = kvm_state; |
290 |
|
291 |
if (s->coalesced_mmio) {
|
292 |
struct kvm_coalesced_mmio_zone zone;
|
293 |
|
294 |
zone.addr = start; |
295 |
zone.size = size; |
296 |
|
297 |
ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); |
298 |
} |
299 |
#endif
|
300 |
|
301 |
return ret;
|
302 |
} |
303 |
|
304 |
int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
|
305 |
{ |
306 |
int ret = -ENOSYS;
|
307 |
#ifdef KVM_CAP_COALESCED_MMIO
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308 |
KVMState *s = kvm_state; |
309 |
|
310 |
if (s->coalesced_mmio) {
|
311 |
struct kvm_coalesced_mmio_zone zone;
|
312 |
|
313 |
zone.addr = start; |
314 |
zone.size = size; |
315 |
|
316 |
ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); |
317 |
} |
318 |
#endif
|
319 |
|
320 |
return ret;
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321 |
} |
322 |
|
323 |
int kvm_init(int smp_cpus) |
324 |
{ |
325 |
KVMState *s; |
326 |
int ret;
|
327 |
int i;
|
328 |
|
329 |
if (smp_cpus > 1) |
330 |
return -EINVAL;
|
331 |
|
332 |
s = qemu_mallocz(sizeof(KVMState));
|
333 |
|
334 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
335 |
TAILQ_INIT(&s->kvm_sw_breakpoints); |
336 |
#endif
|
337 |
for (i = 0; i < ARRAY_SIZE(s->slots); i++) |
338 |
s->slots[i].slot = i; |
339 |
|
340 |
s->vmfd = -1;
|
341 |
s->fd = open("/dev/kvm", O_RDWR);
|
342 |
if (s->fd == -1) { |
343 |
fprintf(stderr, "Could not access KVM kernel module: %m\n");
|
344 |
ret = -errno; |
345 |
goto err;
|
346 |
} |
347 |
|
348 |
ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
|
349 |
if (ret < KVM_API_VERSION) {
|
350 |
if (ret > 0) |
351 |
ret = -EINVAL; |
352 |
fprintf(stderr, "kvm version too old\n");
|
353 |
goto err;
|
354 |
} |
355 |
|
356 |
if (ret > KVM_API_VERSION) {
|
357 |
ret = -EINVAL; |
358 |
fprintf(stderr, "kvm version not supported\n");
|
359 |
goto err;
|
360 |
} |
361 |
|
362 |
s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
|
363 |
if (s->vmfd < 0) |
364 |
goto err;
|
365 |
|
366 |
/* initially, KVM allocated its own memory and we had to jump through
|
367 |
* hooks to make phys_ram_base point to this. Modern versions of KVM
|
368 |
* just use a user allocated buffer so we can use regular pages
|
369 |
* unmodified. Make sure we have a sufficiently modern version of KVM.
|
370 |
*/
|
371 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY); |
372 |
if (ret <= 0) { |
373 |
if (ret == 0) |
374 |
ret = -EINVAL; |
375 |
fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n");
|
376 |
goto err;
|
377 |
} |
378 |
|
379 |
/* There was a nasty bug in < kvm-80 that prevents memory slots from being
|
380 |
* destroyed properly. Since we rely on this capability, refuse to work
|
381 |
* with any kernel without this capability. */
|
382 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, |
383 |
KVM_CAP_DESTROY_MEMORY_REGION_WORKS); |
384 |
if (ret <= 0) { |
385 |
if (ret == 0) |
386 |
ret = -EINVAL; |
387 |
|
388 |
fprintf(stderr, |
389 |
"KVM kernel module broken (DESTROY_MEMORY_REGION)\n"
|
390 |
"Please upgrade to at least kvm-81.\n");
|
391 |
goto err;
|
392 |
} |
393 |
|
394 |
s->coalesced_mmio = 0;
|
395 |
#ifdef KVM_CAP_COALESCED_MMIO
|
396 |
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_COALESCED_MMIO); |
397 |
if (ret > 0) |
398 |
s->coalesced_mmio = ret; |
399 |
#endif
|
400 |
|
401 |
ret = kvm_arch_init(s, smp_cpus); |
402 |
if (ret < 0) |
403 |
goto err;
|
404 |
|
405 |
kvm_state = s; |
406 |
|
407 |
return 0; |
408 |
|
409 |
err:
|
410 |
if (s) {
|
411 |
if (s->vmfd != -1) |
412 |
close(s->vmfd); |
413 |
if (s->fd != -1) |
414 |
close(s->fd); |
415 |
} |
416 |
qemu_free(s); |
417 |
|
418 |
return ret;
|
419 |
} |
420 |
|
421 |
static int kvm_handle_io(CPUState *env, uint16_t port, void *data, |
422 |
int direction, int size, uint32_t count) |
423 |
{ |
424 |
int i;
|
425 |
uint8_t *ptr = data; |
426 |
|
427 |
for (i = 0; i < count; i++) { |
428 |
if (direction == KVM_EXIT_IO_IN) {
|
429 |
switch (size) {
|
430 |
case 1: |
431 |
stb_p(ptr, cpu_inb(env, port)); |
432 |
break;
|
433 |
case 2: |
434 |
stw_p(ptr, cpu_inw(env, port)); |
435 |
break;
|
436 |
case 4: |
437 |
stl_p(ptr, cpu_inl(env, port)); |
438 |
break;
|
439 |
} |
440 |
} else {
|
441 |
switch (size) {
|
442 |
case 1: |
443 |
cpu_outb(env, port, ldub_p(ptr)); |
444 |
break;
|
445 |
case 2: |
446 |
cpu_outw(env, port, lduw_p(ptr)); |
447 |
break;
|
448 |
case 4: |
449 |
cpu_outl(env, port, ldl_p(ptr)); |
450 |
break;
|
451 |
} |
452 |
} |
453 |
|
454 |
ptr += size; |
455 |
} |
456 |
|
457 |
return 1; |
458 |
} |
459 |
|
460 |
static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run) |
461 |
{ |
462 |
#ifdef KVM_CAP_COALESCED_MMIO
|
463 |
KVMState *s = kvm_state; |
464 |
if (s->coalesced_mmio) {
|
465 |
struct kvm_coalesced_mmio_ring *ring;
|
466 |
|
467 |
ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE);
|
468 |
while (ring->first != ring->last) {
|
469 |
struct kvm_coalesced_mmio *ent;
|
470 |
|
471 |
ent = &ring->coalesced_mmio[ring->first]; |
472 |
|
473 |
cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); |
474 |
/* FIXME smp_wmb() */
|
475 |
ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
|
476 |
} |
477 |
} |
478 |
#endif
|
479 |
} |
480 |
|
481 |
int kvm_cpu_exec(CPUState *env)
|
482 |
{ |
483 |
struct kvm_run *run = env->kvm_run;
|
484 |
int ret;
|
485 |
|
486 |
dprintf("kvm_cpu_exec()\n");
|
487 |
|
488 |
do {
|
489 |
kvm_arch_pre_run(env, run); |
490 |
|
491 |
if (env->exit_request) {
|
492 |
dprintf("interrupt exit requested\n");
|
493 |
ret = 0;
|
494 |
break;
|
495 |
} |
496 |
|
497 |
ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
|
498 |
kvm_arch_post_run(env, run); |
499 |
|
500 |
if (ret == -EINTR || ret == -EAGAIN) {
|
501 |
dprintf("io window exit\n");
|
502 |
ret = 0;
|
503 |
break;
|
504 |
} |
505 |
|
506 |
if (ret < 0) { |
507 |
dprintf("kvm run failed %s\n", strerror(-ret));
|
508 |
abort(); |
509 |
} |
510 |
|
511 |
kvm_run_coalesced_mmio(env, run); |
512 |
|
513 |
ret = 0; /* exit loop */ |
514 |
switch (run->exit_reason) {
|
515 |
case KVM_EXIT_IO:
|
516 |
dprintf("handle_io\n");
|
517 |
ret = kvm_handle_io(env, run->io.port, |
518 |
(uint8_t *)run + run->io.data_offset, |
519 |
run->io.direction, |
520 |
run->io.size, |
521 |
run->io.count); |
522 |
break;
|
523 |
case KVM_EXIT_MMIO:
|
524 |
dprintf("handle_mmio\n");
|
525 |
cpu_physical_memory_rw(run->mmio.phys_addr, |
526 |
run->mmio.data, |
527 |
run->mmio.len, |
528 |
run->mmio.is_write); |
529 |
ret = 1;
|
530 |
break;
|
531 |
case KVM_EXIT_IRQ_WINDOW_OPEN:
|
532 |
dprintf("irq_window_open\n");
|
533 |
break;
|
534 |
case KVM_EXIT_SHUTDOWN:
|
535 |
dprintf("shutdown\n");
|
536 |
qemu_system_reset_request(); |
537 |
ret = 1;
|
538 |
break;
|
539 |
case KVM_EXIT_UNKNOWN:
|
540 |
dprintf("kvm_exit_unknown\n");
|
541 |
break;
|
542 |
case KVM_EXIT_FAIL_ENTRY:
|
543 |
dprintf("kvm_exit_fail_entry\n");
|
544 |
break;
|
545 |
case KVM_EXIT_EXCEPTION:
|
546 |
dprintf("kvm_exit_exception\n");
|
547 |
break;
|
548 |
case KVM_EXIT_DEBUG:
|
549 |
dprintf("kvm_exit_debug\n");
|
550 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
551 |
if (kvm_arch_debug(&run->debug.arch)) {
|
552 |
gdb_set_stop_cpu(env); |
553 |
vm_stop(EXCP_DEBUG); |
554 |
env->exception_index = EXCP_DEBUG; |
555 |
return 0; |
556 |
} |
557 |
/* re-enter, this exception was guest-internal */
|
558 |
ret = 1;
|
559 |
#endif /* KVM_CAP_SET_GUEST_DEBUG */ |
560 |
break;
|
561 |
default:
|
562 |
dprintf("kvm_arch_handle_exit\n");
|
563 |
ret = kvm_arch_handle_exit(env, run); |
564 |
break;
|
565 |
} |
566 |
} while (ret > 0); |
567 |
|
568 |
if (env->exit_request) {
|
569 |
env->exit_request = 0;
|
570 |
env->exception_index = EXCP_INTERRUPT; |
571 |
} |
572 |
|
573 |
return ret;
|
574 |
} |
575 |
|
576 |
void kvm_set_phys_mem(target_phys_addr_t start_addr,
|
577 |
ram_addr_t size, |
578 |
ram_addr_t phys_offset) |
579 |
{ |
580 |
KVMState *s = kvm_state; |
581 |
ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; |
582 |
KVMSlot *mem, old; |
583 |
int err;
|
584 |
|
585 |
if (start_addr & ~TARGET_PAGE_MASK) {
|
586 |
fprintf(stderr, "Only page-aligned memory slots supported\n");
|
587 |
abort(); |
588 |
} |
589 |
|
590 |
/* KVM does not support read-only slots */
|
591 |
phys_offset &= ~IO_MEM_ROM; |
592 |
|
593 |
while (1) { |
594 |
mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size); |
595 |
if (!mem) {
|
596 |
break;
|
597 |
} |
598 |
|
599 |
if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr &&
|
600 |
(start_addr + size <= mem->start_addr + mem->memory_size) && |
601 |
(phys_offset - start_addr == mem->phys_offset - mem->start_addr)) { |
602 |
/* The new slot fits into the existing one and comes with
|
603 |
* identical parameters - nothing to be done. */
|
604 |
return;
|
605 |
} |
606 |
|
607 |
old = *mem; |
608 |
|
609 |
/* unregister the overlapping slot */
|
610 |
mem->memory_size = 0;
|
611 |
err = kvm_set_user_memory_region(s, mem); |
612 |
if (err) {
|
613 |
fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
|
614 |
__func__, strerror(-err)); |
615 |
abort(); |
616 |
} |
617 |
|
618 |
/* Workaround for older KVM versions: we can't join slots, even not by
|
619 |
* unregistering the previous ones and then registering the larger
|
620 |
* slot. We have to maintain the existing fragmentation. Sigh.
|
621 |
*
|
622 |
* This workaround assumes that the new slot starts at the same
|
623 |
* address as the first existing one. If not or if some overlapping
|
624 |
* slot comes around later, we will fail (not seen in practice so far)
|
625 |
* - and actually require a recent KVM version. */
|
626 |
if (old.start_addr == start_addr && old.memory_size < size &&
|
627 |
flags < IO_MEM_UNASSIGNED) { |
628 |
mem = kvm_alloc_slot(s); |
629 |
mem->memory_size = old.memory_size; |
630 |
mem->start_addr = old.start_addr; |
631 |
mem->phys_offset = old.phys_offset; |
632 |
mem->flags = 0;
|
633 |
|
634 |
err = kvm_set_user_memory_region(s, mem); |
635 |
if (err) {
|
636 |
fprintf(stderr, "%s: error updating slot: %s\n", __func__,
|
637 |
strerror(-err)); |
638 |
abort(); |
639 |
} |
640 |
|
641 |
start_addr += old.memory_size; |
642 |
phys_offset += old.memory_size; |
643 |
size -= old.memory_size; |
644 |
continue;
|
645 |
} |
646 |
|
647 |
/* register prefix slot */
|
648 |
if (old.start_addr < start_addr) {
|
649 |
mem = kvm_alloc_slot(s); |
650 |
mem->memory_size = start_addr - old.start_addr; |
651 |
mem->start_addr = old.start_addr; |
652 |
mem->phys_offset = old.phys_offset; |
653 |
mem->flags = 0;
|
654 |
|
655 |
err = kvm_set_user_memory_region(s, mem); |
656 |
if (err) {
|
657 |
fprintf(stderr, "%s: error registering prefix slot: %s\n",
|
658 |
__func__, strerror(-err)); |
659 |
abort(); |
660 |
} |
661 |
} |
662 |
|
663 |
/* register suffix slot */
|
664 |
if (old.start_addr + old.memory_size > start_addr + size) {
|
665 |
ram_addr_t size_delta; |
666 |
|
667 |
mem = kvm_alloc_slot(s); |
668 |
mem->start_addr = start_addr + size; |
669 |
size_delta = mem->start_addr - old.start_addr; |
670 |
mem->memory_size = old.memory_size - size_delta; |
671 |
mem->phys_offset = old.phys_offset + size_delta; |
672 |
mem->flags = 0;
|
673 |
|
674 |
err = kvm_set_user_memory_region(s, mem); |
675 |
if (err) {
|
676 |
fprintf(stderr, "%s: error registering suffix slot: %s\n",
|
677 |
__func__, strerror(-err)); |
678 |
abort(); |
679 |
} |
680 |
} |
681 |
} |
682 |
|
683 |
/* in case the KVM bug workaround already "consumed" the new slot */
|
684 |
if (!size)
|
685 |
return;
|
686 |
|
687 |
/* KVM does not need to know about this memory */
|
688 |
if (flags >= IO_MEM_UNASSIGNED)
|
689 |
return;
|
690 |
|
691 |
mem = kvm_alloc_slot(s); |
692 |
mem->memory_size = size; |
693 |
mem->start_addr = start_addr; |
694 |
mem->phys_offset = phys_offset; |
695 |
mem->flags = 0;
|
696 |
|
697 |
err = kvm_set_user_memory_region(s, mem); |
698 |
if (err) {
|
699 |
fprintf(stderr, "%s: error registering slot: %s\n", __func__,
|
700 |
strerror(-err)); |
701 |
abort(); |
702 |
} |
703 |
} |
704 |
|
705 |
int kvm_ioctl(KVMState *s, int type, ...) |
706 |
{ |
707 |
int ret;
|
708 |
void *arg;
|
709 |
va_list ap; |
710 |
|
711 |
va_start(ap, type); |
712 |
arg = va_arg(ap, void *);
|
713 |
va_end(ap); |
714 |
|
715 |
ret = ioctl(s->fd, type, arg); |
716 |
if (ret == -1) |
717 |
ret = -errno; |
718 |
|
719 |
return ret;
|
720 |
} |
721 |
|
722 |
int kvm_vm_ioctl(KVMState *s, int type, ...) |
723 |
{ |
724 |
int ret;
|
725 |
void *arg;
|
726 |
va_list ap; |
727 |
|
728 |
va_start(ap, type); |
729 |
arg = va_arg(ap, void *);
|
730 |
va_end(ap); |
731 |
|
732 |
ret = ioctl(s->vmfd, type, arg); |
733 |
if (ret == -1) |
734 |
ret = -errno; |
735 |
|
736 |
return ret;
|
737 |
} |
738 |
|
739 |
int kvm_vcpu_ioctl(CPUState *env, int type, ...) |
740 |
{ |
741 |
int ret;
|
742 |
void *arg;
|
743 |
va_list ap; |
744 |
|
745 |
va_start(ap, type); |
746 |
arg = va_arg(ap, void *);
|
747 |
va_end(ap); |
748 |
|
749 |
ret = ioctl(env->kvm_fd, type, arg); |
750 |
if (ret == -1) |
751 |
ret = -errno; |
752 |
|
753 |
return ret;
|
754 |
} |
755 |
|
756 |
int kvm_has_sync_mmu(void) |
757 |
{ |
758 |
#ifdef KVM_CAP_SYNC_MMU
|
759 |
KVMState *s = kvm_state; |
760 |
|
761 |
if (kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_SYNC_MMU) > 0) |
762 |
return 1; |
763 |
#endif
|
764 |
|
765 |
return 0; |
766 |
} |
767 |
|
768 |
#ifdef KVM_CAP_SET_GUEST_DEBUG
|
769 |
struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env,
|
770 |
target_ulong pc) |
771 |
{ |
772 |
struct kvm_sw_breakpoint *bp;
|
773 |
|
774 |
TAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) { |
775 |
if (bp->pc == pc)
|
776 |
return bp;
|
777 |
} |
778 |
return NULL; |
779 |
} |
780 |
|
781 |
int kvm_sw_breakpoints_active(CPUState *env)
|
782 |
{ |
783 |
return !TAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints);
|
784 |
} |
785 |
|
786 |
int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
787 |
{ |
788 |
struct kvm_guest_debug dbg;
|
789 |
|
790 |
dbg.control = 0;
|
791 |
if (env->singlestep_enabled)
|
792 |
dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; |
793 |
|
794 |
kvm_arch_update_guest_debug(env, &dbg); |
795 |
dbg.control |= reinject_trap; |
796 |
|
797 |
return kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg);
|
798 |
} |
799 |
|
800 |
int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
|
801 |
target_ulong len, int type)
|
802 |
{ |
803 |
struct kvm_sw_breakpoint *bp;
|
804 |
CPUState *env; |
805 |
int err;
|
806 |
|
807 |
if (type == GDB_BREAKPOINT_SW) {
|
808 |
bp = kvm_find_sw_breakpoint(current_env, addr); |
809 |
if (bp) {
|
810 |
bp->use_count++; |
811 |
return 0; |
812 |
} |
813 |
|
814 |
bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint)); |
815 |
if (!bp)
|
816 |
return -ENOMEM;
|
817 |
|
818 |
bp->pc = addr; |
819 |
bp->use_count = 1;
|
820 |
err = kvm_arch_insert_sw_breakpoint(current_env, bp); |
821 |
if (err) {
|
822 |
free(bp); |
823 |
return err;
|
824 |
} |
825 |
|
826 |
TAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints, |
827 |
bp, entry); |
828 |
} else {
|
829 |
err = kvm_arch_insert_hw_breakpoint(addr, len, type); |
830 |
if (err)
|
831 |
return err;
|
832 |
} |
833 |
|
834 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
835 |
err = kvm_update_guest_debug(env, 0);
|
836 |
if (err)
|
837 |
return err;
|
838 |
} |
839 |
return 0; |
840 |
} |
841 |
|
842 |
int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
|
843 |
target_ulong len, int type)
|
844 |
{ |
845 |
struct kvm_sw_breakpoint *bp;
|
846 |
CPUState *env; |
847 |
int err;
|
848 |
|
849 |
if (type == GDB_BREAKPOINT_SW) {
|
850 |
bp = kvm_find_sw_breakpoint(current_env, addr); |
851 |
if (!bp)
|
852 |
return -ENOENT;
|
853 |
|
854 |
if (bp->use_count > 1) { |
855 |
bp->use_count--; |
856 |
return 0; |
857 |
} |
858 |
|
859 |
err = kvm_arch_remove_sw_breakpoint(current_env, bp); |
860 |
if (err)
|
861 |
return err;
|
862 |
|
863 |
TAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry); |
864 |
qemu_free(bp); |
865 |
} else {
|
866 |
err = kvm_arch_remove_hw_breakpoint(addr, len, type); |
867 |
if (err)
|
868 |
return err;
|
869 |
} |
870 |
|
871 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
872 |
err = kvm_update_guest_debug(env, 0);
|
873 |
if (err)
|
874 |
return err;
|
875 |
} |
876 |
return 0; |
877 |
} |
878 |
|
879 |
void kvm_remove_all_breakpoints(CPUState *current_env)
|
880 |
{ |
881 |
struct kvm_sw_breakpoint *bp, *next;
|
882 |
KVMState *s = current_env->kvm_state; |
883 |
CPUState *env; |
884 |
|
885 |
TAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { |
886 |
if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) { |
887 |
/* Try harder to find a CPU that currently sees the breakpoint. */
|
888 |
for (env = first_cpu; env != NULL; env = env->next_cpu) { |
889 |
if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) |
890 |
break;
|
891 |
} |
892 |
} |
893 |
} |
894 |
kvm_arch_remove_all_hw_breakpoints(); |
895 |
|
896 |
for (env = first_cpu; env != NULL; env = env->next_cpu) |
897 |
kvm_update_guest_debug(env, 0);
|
898 |
} |
899 |
|
900 |
#else /* !KVM_CAP_SET_GUEST_DEBUG */ |
901 |
|
902 |
int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) |
903 |
{ |
904 |
return -EINVAL;
|
905 |
} |
906 |
|
907 |
int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
|
908 |
target_ulong len, int type)
|
909 |
{ |
910 |
return -EINVAL;
|
911 |
} |
912 |
|
913 |
int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
|
914 |
target_ulong len, int type)
|
915 |
{ |
916 |
return -EINVAL;
|
917 |
} |
918 |
|
919 |
void kvm_remove_all_breakpoints(CPUState *current_env)
|
920 |
{ |
921 |
} |
922 |
#endif /* !KVM_CAP_SET_GUEST_DEBUG */ |