From 1321c76d96910c2c807207f3fdfeb560c598ca60 Mon Sep 17 00:00:00 2001 From: Jun Nakajima Date: Fri, 4 Mar 2011 17:17:45 -0800 Subject: x86: Enable KVM mode for Android x86 emulator (update/rebase) This patch enables KVM mode on x86 Linux to boost performance of x86 emulaiton if the hardware-based virtualization feature is present on the host machine. Change-Id: I4b24474b3ec115a3b9a7bf017801f4f610253b09 Signed-off-by: Xiaohui Xin Signed-off-by: Yunhong Jiang Signed-off-by: Jun Nakajima --- kvm-all.c | 1039 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1039 insertions(+) create mode 100644 kvm-all.c (limited to 'kvm-all.c') diff --git a/kvm-all.c b/kvm-all.c new file mode 100644 index 0000000..f620417 --- /dev/null +++ b/kvm-all.c @@ -0,0 +1,1039 @@ +/* + * QEMU KVM support + * + * Copyright IBM, Corp. 2008 + * Red Hat, Inc. 2008 + * + * Authors: + * Anthony Liguori + * Glauber Costa + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + * + */ + +#include +#include +#include +#include + +#include + +#include "qemu-common.h" +#include "sysemu.h" +#include "hw/hw.h" +#include "gdbstub.h" +#include "kvm.h" + +/* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */ +#define PAGE_SIZE TARGET_PAGE_SIZE + +//#define DEBUG_KVM + +#ifdef DEBUG_KVM +#define dprintf(fmt, ...) \ + do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0) +#else +#define dprintf(fmt, ...) \ + do { } while (0) +#endif + +typedef struct KVMSlot +{ + target_phys_addr_t start_addr; + ram_addr_t memory_size; + ram_addr_t phys_offset; + int slot; + int flags; +} KVMSlot; + +typedef struct kvm_dirty_log KVMDirtyLog; + +int kvm_allowed = 0; + +struct KVMState +{ + KVMSlot slots[32]; + int fd; + int vmfd; + int coalesced_mmio; + int broken_set_mem_region; + int migration_log; +#ifdef KVM_CAP_SET_GUEST_DEBUG + struct kvm_sw_breakpoint_head kvm_sw_breakpoints; +#endif +}; + +static KVMState *kvm_state; + +static KVMSlot *kvm_alloc_slot(KVMState *s) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(s->slots); i++) { + /* KVM private memory slots */ + if (i >= 8 && i < 12) + continue; + if (s->slots[i].memory_size == 0) + return &s->slots[i]; + } + + fprintf(stderr, "%s: no free slot available\n", __func__); + abort(); +} + +static KVMSlot *kvm_lookup_matching_slot(KVMState *s, + target_phys_addr_t start_addr, + target_phys_addr_t end_addr) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(s->slots); i++) { + KVMSlot *mem = &s->slots[i]; + + if (start_addr == mem->start_addr && + end_addr == mem->start_addr + mem->memory_size) { + return mem; + } + } + + return NULL; +} + +/* + * Find overlapping slot with lowest start address + */ +static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s, + target_phys_addr_t start_addr, + target_phys_addr_t end_addr) +{ + KVMSlot *found = NULL; + int i; + + for (i = 0; i < ARRAY_SIZE(s->slots); i++) { + KVMSlot *mem = &s->slots[i]; + + if (mem->memory_size == 0 || + (found && found->start_addr < mem->start_addr)) { + continue; + } + + if (end_addr > mem->start_addr && + start_addr < mem->start_addr + mem->memory_size) { + found = mem; + } + } + + return found; +} + +static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot) +{ + struct kvm_userspace_memory_region mem; + + mem.slot = slot->slot; + mem.guest_phys_addr = slot->start_addr; + mem.memory_size = slot->memory_size; + mem.userspace_addr = (unsigned long)qemu_get_ram_ptr(slot->phys_offset); + mem.flags = slot->flags; + if (s->migration_log) { + mem.flags |= KVM_MEM_LOG_DIRTY_PAGES; + } + return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem); +} + + +int kvm_init_vcpu(CPUState *env) +{ + KVMState *s = kvm_state; + long mmap_size; + int ret; + + dprintf("kvm_init_vcpu\n"); + + ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index); + if (ret < 0) { + dprintf("kvm_create_vcpu failed\n"); + goto err; + } + + env->kvm_fd = ret; + env->kvm_state = s; + + mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0); + if (mmap_size < 0) { + dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n"); + goto err; + } + + env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, + env->kvm_fd, 0); + if (env->kvm_run == MAP_FAILED) { + ret = -errno; + dprintf("mmap'ing vcpu state failed\n"); + goto err; + } + + ret = kvm_arch_init_vcpu(env); + +err: + return ret; +} + +int kvm_put_mp_state(CPUState *env) +{ + struct kvm_mp_state mp_state = { .mp_state = env->mp_state }; + + return kvm_vcpu_ioctl(env, KVM_SET_MP_STATE, &mp_state); +} + +int kvm_get_mp_state(CPUState *env) +{ + struct kvm_mp_state mp_state; + int ret; + + ret = kvm_vcpu_ioctl(env, KVM_GET_MP_STATE, &mp_state); + if (ret < 0) { + return ret; + } + env->mp_state = mp_state.mp_state; + return 0; +} + +int kvm_sync_vcpus(void) +{ + CPUState *env; + + for (env = first_cpu; env != NULL; env = env->next_cpu) { + int ret; + + ret = kvm_arch_put_registers(env); + if (ret) + return ret; + } + + return 0; +} + +/* + * dirty pages logging control + */ +static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr, + ram_addr_t size, int flags, int mask) +{ + KVMState *s = kvm_state; + KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size); + int old_flags; + + if (mem == NULL) { + fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-" + TARGET_FMT_plx "\n", __func__, phys_addr, + phys_addr + size - 1); + return -EINVAL; + } + + old_flags = mem->flags; + + flags = (mem->flags & ~mask) | flags; + mem->flags = flags; + + /* If nothing changed effectively, no need to issue ioctl */ + if (s->migration_log) { + flags |= KVM_MEM_LOG_DIRTY_PAGES; + } + if (flags == old_flags) { + return 0; + } + + return kvm_set_user_memory_region(s, mem); +} + +int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size) +{ + return kvm_dirty_pages_log_change(phys_addr, size, + KVM_MEM_LOG_DIRTY_PAGES, + KVM_MEM_LOG_DIRTY_PAGES); +} + +int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size) +{ + return kvm_dirty_pages_log_change(phys_addr, size, + 0, + KVM_MEM_LOG_DIRTY_PAGES); +} + +int kvm_set_migration_log(int enable) +{ + KVMState *s = kvm_state; + KVMSlot *mem; + int i, err; + + s->migration_log = enable; + + for (i = 0; i < ARRAY_SIZE(s->slots); i++) { + mem = &s->slots[i]; + + if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) { + continue; + } + err = kvm_set_user_memory_region(s, mem); + if (err) { + return err; + } + } + return 0; +} + +/** + * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space + * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty(). + * This means all bits are set to dirty. + * + * @start_add: start of logged region. + * @end_addr: end of logged region. + */ +int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, + target_phys_addr_t end_addr) +{ + KVMState *s = kvm_state; + unsigned long size, allocated_size = 0; + target_phys_addr_t phys_addr; + ram_addr_t addr; + KVMDirtyLog d; + KVMSlot *mem; + int ret = 0; + + d.dirty_bitmap = NULL; + while (start_addr < end_addr) { + mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr); + if (mem == NULL) { + break; + } + + size = ((mem->memory_size >> TARGET_PAGE_BITS) + 7) / 8; + if (!d.dirty_bitmap) { + d.dirty_bitmap = qemu_malloc(size); + } else if (size > allocated_size) { + d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size); + } + allocated_size = size; + memset(d.dirty_bitmap, 0, allocated_size); + + d.slot = mem->slot; + + if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) { + dprintf("ioctl failed %d\n", errno); + ret = -1; + break; + } + + for (phys_addr = mem->start_addr, addr = mem->phys_offset; + phys_addr < mem->start_addr + mem->memory_size; + phys_addr += TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) { + unsigned long *bitmap = (unsigned long *)d.dirty_bitmap; + unsigned nr = (phys_addr - mem->start_addr) >> TARGET_PAGE_BITS; + unsigned word = nr / (sizeof(*bitmap) * 8); + unsigned bit = nr % (sizeof(*bitmap) * 8); + + if ((bitmap[word] >> bit) & 1) { + cpu_physical_memory_set_dirty(addr); + } + } + start_addr = phys_addr; + } + qemu_free(d.dirty_bitmap); + + return ret; +} + +int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) +{ + int ret = -ENOSYS; +#ifdef KVM_CAP_COALESCED_MMIO + KVMState *s = kvm_state; + + if (s->coalesced_mmio) { + struct kvm_coalesced_mmio_zone zone; + + zone.addr = start; + zone.size = size; + + ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone); + } +#endif + + return ret; +} + +int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size) +{ + int ret = -ENOSYS; +#ifdef KVM_CAP_COALESCED_MMIO + KVMState *s = kvm_state; + + if (s->coalesced_mmio) { + struct kvm_coalesced_mmio_zone zone; + + zone.addr = start; + zone.size = size; + + ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone); + } +#endif + + return ret; +} + +int kvm_check_extension(KVMState *s, unsigned int extension) +{ + int ret; + + ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension); + if (ret < 0) { + ret = 0; + } + + return ret; +} + +static void kvm_reset_vcpus(void *opaque) +{ + kvm_sync_vcpus(); +} + +int kvm_init(int smp_cpus) +{ + static const char upgrade_note[] = + "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n" + "(see http://sourceforge.net/projects/kvm).\n"; + KVMState *s; + int ret; + int i; + + if (smp_cpus > 1) { + fprintf(stderr, "No SMP KVM support, use '-smp 1'\n"); + return -EINVAL; + } + + s = qemu_mallocz(sizeof(KVMState)); + +#ifdef KVM_CAP_SET_GUEST_DEBUG + QTAILQ_INIT(&s->kvm_sw_breakpoints); +#endif + for (i = 0; i < ARRAY_SIZE(s->slots); i++) + s->slots[i].slot = i; + + s->vmfd = -1; + s->fd = open("/dev/kvm", O_RDWR); + if (s->fd == -1) { + fprintf(stderr, "Could not access KVM kernel module: %m\n"); + ret = -errno; + goto err; + } + + ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0); + if (ret < KVM_API_VERSION) { + if (ret > 0) + ret = -EINVAL; + fprintf(stderr, "kvm version too old\n"); + goto err; + } + + if (ret > KVM_API_VERSION) { + ret = -EINVAL; + fprintf(stderr, "kvm version not supported\n"); + goto err; + } + + s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0); + if (s->vmfd < 0) + goto err; + + /* initially, KVM allocated its own memory and we had to jump through + * hooks to make phys_ram_base point to this. Modern versions of KVM + * just use a user allocated buffer so we can use regular pages + * unmodified. Make sure we have a sufficiently modern version of KVM. + */ + if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) { + ret = -EINVAL; + fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s", + upgrade_note); + goto err; + } + + /* There was a nasty bug in < kvm-80 that prevents memory slots from being + * destroyed properly. Since we rely on this capability, refuse to work + * with any kernel without this capability. */ + if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) { + ret = -EINVAL; + + fprintf(stderr, + "KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s", + upgrade_note); + goto err; + } + +#ifdef KVM_CAP_COALESCED_MMIO + s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO); +#else + s->coalesced_mmio = 0; +#endif + + s->broken_set_mem_region = 1; +#ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS + ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS); + if (ret > 0) { + s->broken_set_mem_region = 0; + } +#endif + + ret = kvm_arch_init(s, smp_cpus); + if (ret < 0) + goto err; + + qemu_register_reset(kvm_reset_vcpus, INT_MAX, NULL); + + kvm_state = s; + + return 0; + +err: + if (s) { + if (s->vmfd != -1) + close(s->vmfd); + if (s->fd != -1) + close(s->fd); + } + qemu_free(s); + + return ret; +} + +static int kvm_handle_io(CPUState *env, uint16_t port, void *data, + int direction, int size, uint32_t count) +{ + int i; + uint8_t *ptr = data; + + for (i = 0; i < count; i++) { + if (direction == KVM_EXIT_IO_IN) { + switch (size) { + case 1: + stb_p(ptr, cpu_inb(port)); + break; + case 2: + stw_p(ptr, cpu_inw(port)); + break; + case 4: + stl_p(ptr, cpu_inl(port)); + break; + } + } else { + switch (size) { + case 1: + cpu_outb(port, ldub_p(ptr)); + break; + case 2: + cpu_outw(port, lduw_p(ptr)); + break; + case 4: + cpu_outl(port, ldl_p(ptr)); + break; + } + } + + ptr += size; + } + + return 1; +} + +static void kvm_run_coalesced_mmio(CPUState *env, struct kvm_run *run) +{ +#ifdef KVM_CAP_COALESCED_MMIO + KVMState *s = kvm_state; + if (s->coalesced_mmio) { + struct kvm_coalesced_mmio_ring *ring; + + ring = (void *)run + (s->coalesced_mmio * TARGET_PAGE_SIZE); + while (ring->first != ring->last) { + struct kvm_coalesced_mmio *ent; + + ent = &ring->coalesced_mmio[ring->first]; + + cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len); + /* FIXME smp_wmb() */ + ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX; + } + } +#endif +} + +int kvm_cpu_exec(CPUState *env) +{ + struct kvm_run *run = env->kvm_run; + int ret; + + dprintf("kvm_cpu_exec()\n"); + + do { + if (env->exit_request) { + dprintf("interrupt exit requested\n"); + ret = 0; + break; + } + + kvm_arch_pre_run(env, run); + ret = kvm_vcpu_ioctl(env, KVM_RUN, 0); + kvm_arch_post_run(env, run); + + if (ret == -EINTR || ret == -EAGAIN) { + dprintf("io window exit\n"); + ret = 0; + break; + } + + if (ret < 0) { + dprintf("kvm run failed %s\n", strerror(-ret)); + abort(); + } + + kvm_run_coalesced_mmio(env, run); + + ret = 0; /* exit loop */ + switch (run->exit_reason) { + case KVM_EXIT_IO: + dprintf("handle_io\n"); + ret = kvm_handle_io(env, run->io.port, + (uint8_t *)run + run->io.data_offset, + run->io.direction, + run->io.size, + run->io.count); + break; + case KVM_EXIT_MMIO: + dprintf("handle_mmio\n"); + cpu_physical_memory_rw(run->mmio.phys_addr, + run->mmio.data, + run->mmio.len, + run->mmio.is_write); + ret = 1; + break; + case KVM_EXIT_IRQ_WINDOW_OPEN: + dprintf("irq_window_open\n"); + break; + case KVM_EXIT_SHUTDOWN: + dprintf("shutdown\n"); + qemu_system_reset_request(); + ret = 1; + break; + case KVM_EXIT_UNKNOWN: + dprintf("kvm_exit_unknown\n"); + break; + case KVM_EXIT_FAIL_ENTRY: + dprintf("kvm_exit_fail_entry\n"); + break; + case KVM_EXIT_EXCEPTION: + dprintf("kvm_exit_exception\n"); + break; + case KVM_EXIT_DEBUG: + dprintf("kvm_exit_debug\n"); +#ifdef KVM_CAP_SET_GUEST_DEBUG + if (kvm_arch_debug(&run->debug.arch)) { + gdb_set_stop_cpu(env); + vm_stop(EXCP_DEBUG); + env->exception_index = EXCP_DEBUG; + return 0; + } + /* re-enter, this exception was guest-internal */ + ret = 1; +#endif /* KVM_CAP_SET_GUEST_DEBUG */ + break; + default: + dprintf("kvm_arch_handle_exit\n"); + ret = kvm_arch_handle_exit(env, run); + break; + } + } while (ret > 0); + + if (env->exit_request) { + env->exit_request = 0; + env->exception_index = EXCP_INTERRUPT; + } + + return ret; +} + +void kvm_set_phys_mem(target_phys_addr_t start_addr, + ram_addr_t size, + ram_addr_t phys_offset) +{ + KVMState *s = kvm_state; + ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK; + KVMSlot *mem, old; + int err; + + if (start_addr & ~TARGET_PAGE_MASK) { + if (flags >= IO_MEM_UNASSIGNED) { + if (!kvm_lookup_overlapping_slot(s, start_addr, + start_addr + size)) { + return; + } + fprintf(stderr, "Unaligned split of a KVM memory slot\n"); + } else { + fprintf(stderr, "Only page-aligned memory slots supported\n"); + } + abort(); + } + + /* KVM does not support read-only slots */ + phys_offset &= ~IO_MEM_ROM; + + while (1) { + mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size); + if (!mem) { + break; + } + + if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr && + (start_addr + size <= mem->start_addr + mem->memory_size) && + (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) { + /* The new slot fits into the existing one and comes with + * identical parameters - nothing to be done. */ + return; + } + + old = *mem; + + /* unregister the overlapping slot */ + mem->memory_size = 0; + err = kvm_set_user_memory_region(s, mem); + if (err) { + fprintf(stderr, "%s: error unregistering overlapping slot: %s\n", + __func__, strerror(-err)); + abort(); + } + + /* Workaround for older KVM versions: we can't join slots, even not by + * unregistering the previous ones and then registering the larger + * slot. We have to maintain the existing fragmentation. Sigh. + * + * This workaround assumes that the new slot starts at the same + * address as the first existing one. If not or if some overlapping + * slot comes around later, we will fail (not seen in practice so far) + * - and actually require a recent KVM version. */ + if (s->broken_set_mem_region && + old.start_addr == start_addr && old.memory_size < size && + flags < IO_MEM_UNASSIGNED) { + mem = kvm_alloc_slot(s); + mem->memory_size = old.memory_size; + mem->start_addr = old.start_addr; + mem->phys_offset = old.phys_offset; + mem->flags = 0; + + err = kvm_set_user_memory_region(s, mem); + if (err) { + fprintf(stderr, "%s: error updating slot: %s\n", __func__, + strerror(-err)); + abort(); + } + + start_addr += old.memory_size; + phys_offset += old.memory_size; + size -= old.memory_size; + continue; + } + + /* register prefix slot */ + if (old.start_addr < start_addr) { + mem = kvm_alloc_slot(s); + mem->memory_size = start_addr - old.start_addr; + mem->start_addr = old.start_addr; + mem->phys_offset = old.phys_offset; + mem->flags = 0; + + err = kvm_set_user_memory_region(s, mem); + if (err) { + fprintf(stderr, "%s: error registering prefix slot: %s\n", + __func__, strerror(-err)); + abort(); + } + } + + /* register suffix slot */ + if (old.start_addr + old.memory_size > start_addr + size) { + ram_addr_t size_delta; + + mem = kvm_alloc_slot(s); + mem->start_addr = start_addr + size; + size_delta = mem->start_addr - old.start_addr; + mem->memory_size = old.memory_size - size_delta; + mem->phys_offset = old.phys_offset + size_delta; + mem->flags = 0; + + err = kvm_set_user_memory_region(s, mem); + if (err) { + fprintf(stderr, "%s: error registering suffix slot: %s\n", + __func__, strerror(-err)); + abort(); + } + } + } + + /* in case the KVM bug workaround already "consumed" the new slot */ + if (!size) + return; + + /* KVM does not need to know about this memory */ + if (flags >= IO_MEM_UNASSIGNED) + return; + + mem = kvm_alloc_slot(s); + mem->memory_size = size; + mem->start_addr = start_addr; + mem->phys_offset = phys_offset; + mem->flags = 0; + + err = kvm_set_user_memory_region(s, mem); + if (err) { + fprintf(stderr, "%s: error registering slot: %s\n", __func__, + strerror(-err)); + abort(); + } +} + +int kvm_ioctl(KVMState *s, int type, ...) +{ + int ret; + void *arg; + va_list ap; + + va_start(ap, type); + arg = va_arg(ap, void *); + va_end(ap); + + ret = ioctl(s->fd, type, arg); + if (ret == -1) + ret = -errno; + + return ret; +} + +int kvm_vm_ioctl(KVMState *s, int type, ...) +{ + int ret; + void *arg; + va_list ap; + + va_start(ap, type); + arg = va_arg(ap, void *); + va_end(ap); + + ret = ioctl(s->vmfd, type, arg); + if (ret == -1) + ret = -errno; + + return ret; +} + +int kvm_vcpu_ioctl(CPUState *env, int type, ...) +{ + int ret; + void *arg; + va_list ap; + + va_start(ap, type); + arg = va_arg(ap, void *); + va_end(ap); + + ret = ioctl(env->kvm_fd, type, arg); + if (ret == -1) + ret = -errno; + + return ret; +} + +int kvm_has_sync_mmu(void) +{ +#ifdef KVM_CAP_SYNC_MMU + KVMState *s = kvm_state; + + return kvm_check_extension(s, KVM_CAP_SYNC_MMU); +#else + return 0; +#endif +} + +void kvm_setup_guest_memory(void *start, size_t size) +{ + if (!kvm_has_sync_mmu()) { +#ifdef MADV_DONTFORK + int ret = madvise(start, size, MADV_DONTFORK); + + if (ret) { + perror("madvice"); + exit(1); + } +#else + fprintf(stderr, + "Need MADV_DONTFORK in absence of synchronous KVM MMU\n"); + exit(1); +#endif + } +} + +#ifdef KVM_CAP_SET_GUEST_DEBUG +struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env, + target_ulong pc) +{ + struct kvm_sw_breakpoint *bp; + + QTAILQ_FOREACH(bp, &env->kvm_state->kvm_sw_breakpoints, entry) { + if (bp->pc == pc) + return bp; + } + return NULL; +} + +int kvm_sw_breakpoints_active(CPUState *env) +{ + return !QTAILQ_EMPTY(&env->kvm_state->kvm_sw_breakpoints); +} + +int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) +{ + struct kvm_guest_debug dbg; + + dbg.control = 0; + if (env->singlestep_enabled) + dbg.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP; + + kvm_arch_update_guest_debug(env, &dbg); + dbg.control |= reinject_trap; + + return kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg); +} + +int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, + target_ulong len, int type) +{ + struct kvm_sw_breakpoint *bp; + CPUState *env; + int err; + + if (type == GDB_BREAKPOINT_SW) { + bp = kvm_find_sw_breakpoint(current_env, addr); + if (bp) { + bp->use_count++; + return 0; + } + + bp = qemu_malloc(sizeof(struct kvm_sw_breakpoint)); + if (!bp) + return -ENOMEM; + + bp->pc = addr; + bp->use_count = 1; + err = kvm_arch_insert_sw_breakpoint(current_env, bp); + if (err) { + free(bp); + return err; + } + + QTAILQ_INSERT_HEAD(¤t_env->kvm_state->kvm_sw_breakpoints, + bp, entry); + } else { + err = kvm_arch_insert_hw_breakpoint(addr, len, type); + if (err) + return err; + } + + for (env = first_cpu; env != NULL; env = env->next_cpu) { + err = kvm_update_guest_debug(env, 0); + if (err) + return err; + } + return 0; +} + +int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, + target_ulong len, int type) +{ + struct kvm_sw_breakpoint *bp; + CPUState *env; + int err; + + if (type == GDB_BREAKPOINT_SW) { + bp = kvm_find_sw_breakpoint(current_env, addr); + if (!bp) + return -ENOENT; + + if (bp->use_count > 1) { + bp->use_count--; + return 0; + } + + err = kvm_arch_remove_sw_breakpoint(current_env, bp); + if (err) + return err; + + QTAILQ_REMOVE(¤t_env->kvm_state->kvm_sw_breakpoints, bp, entry); + qemu_free(bp); + } else { + err = kvm_arch_remove_hw_breakpoint(addr, len, type); + if (err) + return err; + } + + for (env = first_cpu; env != NULL; env = env->next_cpu) { + err = kvm_update_guest_debug(env, 0); + if (err) + return err; + } + return 0; +} + +void kvm_remove_all_breakpoints(CPUState *current_env) +{ + struct kvm_sw_breakpoint *bp, *next; + KVMState *s = current_env->kvm_state; + CPUState *env; + + QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) { + if (kvm_arch_remove_sw_breakpoint(current_env, bp) != 0) { + /* Try harder to find a CPU that currently sees the breakpoint. */ + for (env = first_cpu; env != NULL; env = env->next_cpu) { + if (kvm_arch_remove_sw_breakpoint(env, bp) == 0) + break; + } + } + } + kvm_arch_remove_all_hw_breakpoints(); + + for (env = first_cpu; env != NULL; env = env->next_cpu) + kvm_update_guest_debug(env, 0); +} + +#else /* !KVM_CAP_SET_GUEST_DEBUG */ + +int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap) +{ + return -EINVAL; +} + +int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr, + target_ulong len, int type) +{ + return -EINVAL; +} + +int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr, + target_ulong len, int type) +{ + return -EINVAL; +} + +void kvm_remove_all_breakpoints(CPUState *current_env) +{ +} +#endif /* !KVM_CAP_SET_GUEST_DEBUG */ -- cgit v1.1