* QEMU KVM support
*
* Copyright IBM, Corp. 2008
+ * Red Hat, Inc. 2008
*
* Authors:
*
* 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 <linux/kvm.h>
#include "qemu-common.h"
+#include "qemu-barrier.h"
#include "sysemu.h"
+#include "hw/hw.h"
+#include "gdbstub.h"
#include "kvm.h"
+#include "bswap.h"
+
+/* This check must be after config-host.h is included */
+#ifdef CONFIG_EVENTFD
+#include <sys/eventfd.h>
+#endif
+
+/* 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, ...) \
+#define DPRINTF(fmt, ...) \
do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
-#define dprintf(fmt, ...) \
+#define DPRINTF(fmt, ...) \
do { } while (0)
#endif
int flags;
} KVMSlot;
-int kvm_allowed = 0;
+typedef struct kvm_dirty_log KVMDirtyLog;
struct KVMState
{
KVMSlot slots[32];
int fd;
int vmfd;
+ int coalesced_mmio;
+ struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
+ int broken_set_mem_region;
+ int migration_log;
+ int vcpu_events;
+ int robust_singlestep;
+ int debugregs;
+#ifdef KVM_CAP_SET_GUEST_DEBUG
+ struct kvm_sw_breakpoint_head kvm_sw_breakpoints;
+#endif
+ int irqchip_in_kernel;
+ int pit_in_kernel;
+ int xsave, xcrs;
+ int many_ioeventfds;
};
-static KVMState *kvm_state;
+KVMState *kvm_state;
+
+static const KVMCapabilityInfo kvm_required_capabilites[] = {
+ KVM_CAP_INFO(USER_MEMORY),
+ KVM_CAP_INFO(DESTROY_MEMORY_REGION_WORKS),
+ KVM_CAP_LAST_INFO
+};
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)
+ if (s->slots[i].memory_size == 0) {
return &s->slots[i];
+ }
}
- return NULL;
+ fprintf(stderr, "%s: no free slot available\n", __func__);
+ abort();
}
-static KVMSlot *kvm_lookup_slot(KVMState *s, target_phys_addr_t start_addr)
+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 &&
- start_addr < (mem->start_addr + mem->memory_size))
+ 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;
+}
+
+int kvm_physical_memory_addr_from_ram(KVMState *s, ram_addr_t ram_addr,
+ target_phys_addr_t *phys_addr)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
+ KVMSlot *mem = &s->slots[i];
+
+ if (ram_addr >= mem->phys_offset &&
+ ram_addr < mem->phys_offset + mem->memory_size) {
+ *phys_addr = mem->start_addr + (ram_addr - mem->phys_offset);
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+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_safe_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);
+}
+
+static void kvm_reset_vcpu(void *opaque)
+{
+ CPUState *env = opaque;
+
+ kvm_arch_reset_vcpu(env);
+}
+
+int kvm_irqchip_in_kernel(void)
+{
+ return kvm_state->irqchip_in_kernel;
+}
+
+int kvm_pit_in_kernel(void)
+{
+ return kvm_state->pit_in_kernel;
+}
+
int kvm_init_vcpu(CPUState *env)
{
KVMState *s = kvm_state;
long mmap_size;
int ret;
- dprintf("kvm_init_vcpu\n");
+ 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");
+ DPRINTF("kvm_create_vcpu failed\n");
goto err;
}
env->kvm_fd = ret;
env->kvm_state = s;
+ env->kvm_vcpu_dirty = 1;
mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
if (mmap_size < 0) {
- dprintf("KVM_GET_VCPU_MMAP_SIZE failed\n");
+ ret = mmap_size;
+ DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
goto err;
}
env->kvm_fd, 0);
if (env->kvm_run == MAP_FAILED) {
ret = -errno;
- dprintf("mmap'ing vcpu state failed\n");
+ DPRINTF("mmap'ing vcpu state failed\n");
goto err;
}
- ret = kvm_arch_init_vcpu(env);
+ if (s->coalesced_mmio && !s->coalesced_mmio_ring) {
+ s->coalesced_mmio_ring =
+ (void *)env->kvm_run + s->coalesced_mmio * PAGE_SIZE;
+ }
+ ret = kvm_arch_init_vcpu(env);
+ if (ret == 0) {
+ qemu_register_reset(kvm_reset_vcpu, env);
+ kvm_arch_reset_vcpu(env);
+ }
err:
return ret;
}
-int kvm_init(int smp_cpus)
+/*
+ * dirty pages logging control
+ */
+
+static int kvm_mem_flags(KVMState *s, bool log_dirty)
+{
+ return log_dirty ? KVM_MEM_LOG_DIRTY_PAGES : 0;
+}
+
+static int kvm_slot_dirty_pages_log_change(KVMSlot *mem, bool log_dirty)
+{
+ KVMState *s = kvm_state;
+ int flags, mask = KVM_MEM_LOG_DIRTY_PAGES;
+ int old_flags;
+
+ old_flags = mem->flags;
+
+ flags = (mem->flags & ~mask) | kvm_mem_flags(s, log_dirty);
+ 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);
+}
+
+static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr,
+ ram_addr_t size, bool log_dirty)
+{
+ KVMState *s = kvm_state;
+ KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size);
+
+ if (mem == NULL) {
+ fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-"
+ TARGET_FMT_plx "\n", __func__, phys_addr,
+ (target_phys_addr_t)(phys_addr + size - 1));
+ return -EINVAL;
+ }
+ return kvm_slot_dirty_pages_log_change(mem, log_dirty);
+}
+
+static int kvm_log_start(CPUPhysMemoryClient *client,
+ target_phys_addr_t phys_addr, ram_addr_t size)
+{
+ return kvm_dirty_pages_log_change(phys_addr, size, true);
+}
+
+static int kvm_log_stop(CPUPhysMemoryClient *client,
+ target_phys_addr_t phys_addr, ram_addr_t size)
+{
+ return kvm_dirty_pages_log_change(phys_addr, size, false);
+}
+
+static 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->memory_size) {
+ continue;
+ }
+ if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {
+ continue;
+ }
+ err = kvm_set_user_memory_region(s, mem);
+ if (err) {
+ return err;
+ }
+ }
+ return 0;
+}
+
+/* get kvm's dirty pages bitmap and update qemu's */
+static int kvm_get_dirty_pages_log_range(unsigned long start_addr,
+ unsigned long *bitmap,
+ unsigned long offset,
+ unsigned long mem_size)
+{
+ unsigned int i, j;
+ unsigned long page_number, addr, addr1, c;
+ ram_addr_t ram_addr;
+ unsigned int len = ((mem_size / TARGET_PAGE_SIZE) + HOST_LONG_BITS - 1) /
+ HOST_LONG_BITS;
+
+ /*
+ * bitmap-traveling is faster than memory-traveling (for addr...)
+ * especially when most of the memory is not dirty.
+ */
+ for (i = 0; i < len; i++) {
+ if (bitmap[i] != 0) {
+ c = leul_to_cpu(bitmap[i]);
+ do {
+ j = ffsl(c) - 1;
+ c &= ~(1ul << j);
+ page_number = i * HOST_LONG_BITS + j;
+ addr1 = page_number * TARGET_PAGE_SIZE;
+ addr = offset + addr1;
+ ram_addr = cpu_get_physical_page_desc(addr);
+ cpu_physical_memory_set_dirty(ram_addr);
+ } while (c != 0);
+ }
+ }
+ return 0;
+}
+
+#define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
+
+/**
+ * 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.
+ */
+static 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;
+ 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;
+ }
+
+ /* XXX bad kernel interface alert
+ * For dirty bitmap, kernel allocates array of size aligned to
+ * bits-per-long. But for case when the kernel is 64bits and
+ * the userspace is 32bits, userspace can't align to the same
+ * bits-per-long, since sizeof(long) is different between kernel
+ * and user space. This way, userspace will provide buffer which
+ * may be 4 bytes less than the kernel will use, resulting in
+ * userspace memory corruption (which is not detectable by valgrind
+ * too, in most cases).
+ * So for now, let's align to 64 instead of HOST_LONG_BITS here, in
+ * a hope that sizeof(long) wont become >8 any time soon.
+ */
+ size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS),
+ /*HOST_LONG_BITS*/ 64) / 8;
+ if (!d.dirty_bitmap) {
+ d.dirty_bitmap = g_malloc(size);
+ } else if (size > allocated_size) {
+ d.dirty_bitmap = g_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;
+ }
+
+ kvm_get_dirty_pages_log_range(mem->start_addr, d.dirty_bitmap,
+ mem->start_addr, mem->memory_size);
+ start_addr = mem->start_addr + mem->memory_size;
+ }
+ g_free(d.dirty_bitmap);
+
+ return ret;
+}
+
+int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
+{
+ int ret = -ENOSYS;
+ 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);
+ }
+
+ return ret;
+}
+
+int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
+{
+ int ret = -ENOSYS;
+ 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);
+ }
+
+ 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 int kvm_check_many_ioeventfds(void)
+{
+ /* Userspace can use ioeventfd for io notification. This requires a host
+ * that supports eventfd(2) and an I/O thread; since eventfd does not
+ * support SIGIO it cannot interrupt the vcpu.
+ *
+ * Older kernels have a 6 device limit on the KVM io bus. Find out so we
+ * can avoid creating too many ioeventfds.
+ */
+#if defined(CONFIG_EVENTFD)
+ int ioeventfds[7];
+ int i, ret = 0;
+ for (i = 0; i < ARRAY_SIZE(ioeventfds); i++) {
+ ioeventfds[i] = eventfd(0, EFD_CLOEXEC);
+ if (ioeventfds[i] < 0) {
+ break;
+ }
+ ret = kvm_set_ioeventfd_pio_word(ioeventfds[i], 0, i, true);
+ if (ret < 0) {
+ close(ioeventfds[i]);
+ break;
+ }
+ }
+
+ /* Decide whether many devices are supported or not */
+ ret = i == ARRAY_SIZE(ioeventfds);
+
+ while (i-- > 0) {
+ kvm_set_ioeventfd_pio_word(ioeventfds[i], 0, i, false);
+ close(ioeventfds[i]);
+ }
+ return ret;
+#else
+ return 0;
+#endif
+}
+
+static const KVMCapabilityInfo *
+kvm_check_extension_list(KVMState *s, const KVMCapabilityInfo *list)
+{
+ while (list->name) {
+ if (!kvm_check_extension(s, list->value)) {
+ return list;
+ }
+ list++;
+ }
+ return NULL;
+}
+
+static void kvm_set_phys_mem(target_phys_addr_t start_addr, ram_addr_t size,
+ ram_addr_t phys_offset, bool log_dirty)
+{
+ KVMState *s = kvm_state;
+ ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
+ KVMSlot *mem, old;
+ int err;
+
+ /* kvm works in page size chunks, but the function may be called
+ with sub-page size and unaligned start address. */
+ size = TARGET_PAGE_ALIGN(size);
+ start_addr = TARGET_PAGE_ALIGN(start_addr);
+
+ /* 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 - update flags and done. */
+ kvm_slot_dirty_pages_log_change(mem, log_dirty);
+ 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 = kvm_mem_flags(s, log_dirty);
+
+ 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 = kvm_mem_flags(s, log_dirty);
+
+ err = kvm_set_user_memory_region(s, mem);
+ if (err) {
+ fprintf(stderr, "%s: error registering prefix slot: %s\n",
+ __func__, strerror(-err));
+#ifdef TARGET_PPC
+ fprintf(stderr, "%s: This is probably because your kernel's " \
+ "PAGE_SIZE is too big. Please try to use 4k " \
+ "PAGE_SIZE!\n", __func__);
+#endif
+ 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 = kvm_mem_flags(s, log_dirty);
+
+ 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 = kvm_mem_flags(s, log_dirty);
+
+ err = kvm_set_user_memory_region(s, mem);
+ if (err) {
+ fprintf(stderr, "%s: error registering slot: %s\n", __func__,
+ strerror(-err));
+ abort();
+ }
+}
+
+static void kvm_client_set_memory(struct CPUPhysMemoryClient *client,
+ target_phys_addr_t start_addr,
+ ram_addr_t size, ram_addr_t phys_offset,
+ bool log_dirty)
+{
+ kvm_set_phys_mem(start_addr, size, phys_offset, log_dirty);
+}
+
+static int kvm_client_sync_dirty_bitmap(struct CPUPhysMemoryClient *client,
+ target_phys_addr_t start_addr,
+ target_phys_addr_t end_addr)
+{
+ return kvm_physical_sync_dirty_bitmap(start_addr, end_addr);
+}
+
+static int kvm_client_migration_log(struct CPUPhysMemoryClient *client,
+ int enable)
{
+ return kvm_set_migration_log(enable);
+}
+
+static CPUPhysMemoryClient kvm_cpu_phys_memory_client = {
+ .set_memory = kvm_client_set_memory,
+ .sync_dirty_bitmap = kvm_client_sync_dirty_bitmap,
+ .migration_log = kvm_client_migration_log,
+ .log_start = kvm_log_start,
+ .log_stop = kvm_log_stop,
+};
+
+static void kvm_handle_interrupt(CPUState *env, int mask)
+{
+ env->interrupt_request |= mask;
+
+ if (!qemu_cpu_is_self(env)) {
+ qemu_cpu_kick(env);
+ }
+}
+
+int kvm_init(void)
+{
+ 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;
+ const KVMCapabilityInfo *missing_cap;
int ret;
int i;
- if (smp_cpus > 1)
- return -EINVAL;
-
- s = qemu_mallocz(sizeof(KVMState));
- if (s == NULL)
- return -ENOMEM;
+ s = g_malloc0(sizeof(KVMState));
- for (i = 0; i < ARRAY_SIZE(s->slots); i++)
+#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);
+ s->fd = qemu_open("/dev/kvm", O_RDWR);
if (s->fd == -1) {
fprintf(stderr, "Could not access KVM kernel module: %m\n");
ret = -errno;
ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
if (ret < KVM_API_VERSION) {
- if (ret > 0)
+ if (ret > 0) {
ret = -EINVAL;
+ }
fprintf(stderr, "kvm version too old\n");
goto err;
}
}
s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
- if (s->vmfd < 0)
+ if (s->vmfd < 0) {
+#ifdef TARGET_S390X
+ fprintf(stderr, "Please add the 'switch_amode' kernel parameter to "
+ "your host kernel command line\n");
+#endif
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 phys_ram_base
- * unmodified. Make sure we have a sufficiently modern version of KVM.
- */
- ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY);
- if (ret <= 0) {
- if (ret == 0)
- ret = -EINVAL;
- fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n");
+ missing_cap = kvm_check_extension_list(s, kvm_required_capabilites);
+ if (!missing_cap) {
+ missing_cap =
+ kvm_check_extension_list(s, kvm_arch_required_capabilities);
+ }
+ if (missing_cap) {
+ ret = -EINVAL;
+ fprintf(stderr, "kvm does not support %s\n%s",
+ missing_cap->name, upgrade_note);
goto err;
}
- ret = kvm_arch_init(s, smp_cpus);
- if (ret < 0)
+ s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);
+
+ s->broken_set_mem_region = 1;
+ ret = kvm_check_extension(s, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS);
+ if (ret > 0) {
+ s->broken_set_mem_region = 0;
+ }
+
+#ifdef KVM_CAP_VCPU_EVENTS
+ s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS);
+#endif
+
+ s->robust_singlestep =
+ kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP);
+
+#ifdef KVM_CAP_DEBUGREGS
+ s->debugregs = kvm_check_extension(s, KVM_CAP_DEBUGREGS);
+#endif
+
+#ifdef KVM_CAP_XSAVE
+ s->xsave = kvm_check_extension(s, KVM_CAP_XSAVE);
+#endif
+
+#ifdef KVM_CAP_XCRS
+ s->xcrs = kvm_check_extension(s, KVM_CAP_XCRS);
+#endif
+
+ ret = kvm_arch_init(s);
+ if (ret < 0) {
goto err;
+ }
kvm_state = s;
+ cpu_register_phys_memory_client(&kvm_cpu_phys_memory_client);
+
+ s->many_ioeventfds = kvm_check_many_ioeventfds();
+
+ cpu_interrupt_handler = kvm_handle_interrupt;
return 0;
err:
if (s) {
- if (s->vmfd != -1)
+ if (s->vmfd != -1) {
close(s->vmfd);
- if (s->fd != -1)
+ }
+ if (s->fd != -1) {
close(s->fd);
+ }
}
- qemu_free(s);
+ g_free(s);
return ret;
}
-static int kvm_handle_io(CPUState *env, uint16_t port, void *data,
- int direction, int size, uint32_t count)
+static void kvm_handle_io(uint16_t port, void *data, int direction, int size,
+ uint32_t count)
{
int i;
uint8_t *ptr = data;
if (direction == KVM_EXIT_IO_IN) {
switch (size) {
case 1:
- stb_p(ptr, cpu_inb(env, port));
+ stb_p(ptr, cpu_inb(port));
break;
case 2:
- stw_p(ptr, cpu_inw(env, port));
+ stw_p(ptr, cpu_inw(port));
break;
case 4:
- stl_p(ptr, cpu_inl(env, port));
+ stl_p(ptr, cpu_inl(port));
break;
}
} else {
switch (size) {
case 1:
- cpu_outb(env, port, ldub_p(ptr));
+ cpu_outb(port, ldub_p(ptr));
break;
case 2:
- cpu_outw(env, port, lduw_p(ptr));
+ cpu_outw(port, lduw_p(ptr));
break;
case 4:
- cpu_outl(env, port, ldl_p(ptr));
+ cpu_outl(port, ldl_p(ptr));
break;
}
}
ptr += size;
}
+}
+
+static int kvm_handle_internal_error(CPUState *env, struct kvm_run *run)
+{
+ fprintf(stderr, "KVM internal error.");
+ if (kvm_check_extension(kvm_state, KVM_CAP_INTERNAL_ERROR_DATA)) {
+ int i;
+
+ fprintf(stderr, " Suberror: %d\n", run->internal.suberror);
+ for (i = 0; i < run->internal.ndata; ++i) {
+ fprintf(stderr, "extra data[%d]: %"PRIx64"\n",
+ i, (uint64_t)run->internal.data[i]);
+ }
+ } else {
+ fprintf(stderr, "\n");
+ }
+ if (run->internal.suberror == KVM_INTERNAL_ERROR_EMULATION) {
+ fprintf(stderr, "emulation failure\n");
+ if (!kvm_arch_stop_on_emulation_error(env)) {
+ cpu_dump_state(env, stderr, fprintf, CPU_DUMP_CODE);
+ return EXCP_INTERRUPT;
+ }
+ }
+ /* FIXME: Should trigger a qmp message to let management know
+ * something went wrong.
+ */
+ return -1;
+}
+
+void kvm_flush_coalesced_mmio_buffer(void)
+{
+ KVMState *s = kvm_state;
+ if (s->coalesced_mmio_ring) {
+ struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;
+ 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);
+ smp_wmb();
+ ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
+ }
+ }
+}
+
+static void do_kvm_cpu_synchronize_state(void *_env)
+{
+ CPUState *env = _env;
+
+ if (!env->kvm_vcpu_dirty) {
+ kvm_arch_get_registers(env);
+ env->kvm_vcpu_dirty = 1;
+ }
+}
+
+void kvm_cpu_synchronize_state(CPUState *env)
+{
+ if (!env->kvm_vcpu_dirty) {
+ run_on_cpu(env, do_kvm_cpu_synchronize_state, env);
+ }
+}
+
+void kvm_cpu_synchronize_post_reset(CPUState *env)
+{
+ kvm_arch_put_registers(env, KVM_PUT_RESET_STATE);
+ env->kvm_vcpu_dirty = 0;
+}
- return 1;
+void kvm_cpu_synchronize_post_init(CPUState *env)
+{
+ kvm_arch_put_registers(env, KVM_PUT_FULL_STATE);
+ env->kvm_vcpu_dirty = 0;
}
int kvm_cpu_exec(CPUState *env)
{
struct kvm_run *run = env->kvm_run;
- int ret;
+ int ret, run_ret;
- dprintf("kvm_cpu_exec()\n");
+ DPRINTF("kvm_cpu_exec()\n");
+
+ if (kvm_arch_process_async_events(env)) {
+ env->exit_request = 0;
+ return EXCP_HLT;
+ }
+
+ cpu_single_env = env;
do {
- kvm_arch_pre_run(env, run);
+ if (env->kvm_vcpu_dirty) {
+ kvm_arch_put_registers(env, KVM_PUT_RUNTIME_STATE);
+ env->kvm_vcpu_dirty = 0;
+ }
- if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
- dprintf("interrupt exit requested\n");
- ret = 0;
- break;
+ kvm_arch_pre_run(env, run);
+ if (env->exit_request) {
+ DPRINTF("interrupt exit requested\n");
+ /*
+ * KVM requires us to reenter the kernel after IO exits to complete
+ * instruction emulation. This self-signal will ensure that we
+ * leave ASAP again.
+ */
+ qemu_cpu_kick_self();
}
+ cpu_single_env = NULL;
+ qemu_mutex_unlock_iothread();
- ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
+ run_ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
+
+ qemu_mutex_lock_iothread();
+ cpu_single_env = env;
kvm_arch_post_run(env, run);
- if (ret == -EINTR || ret == -EAGAIN) {
- dprintf("io window exit\n");
- ret = 0;
- break;
- }
+ kvm_flush_coalesced_mmio_buffer();
- if (ret < 0) {
- dprintf("kvm run failed %s\n", strerror(-ret));
+ if (run_ret < 0) {
+ if (run_ret == -EINTR || run_ret == -EAGAIN) {
+ DPRINTF("io window exit\n");
+ ret = EXCP_INTERRUPT;
+ break;
+ }
+ DPRINTF("kvm run failed %s\n", strerror(-run_ret));
abort();
}
- 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);
+ DPRINTF("handle_io\n");
+ kvm_handle_io(run->io.port,
+ (uint8_t *)run + run->io.data_offset,
+ run->io.direction,
+ run->io.size,
+ run->io.count);
+ ret = 0;
break;
case KVM_EXIT_MMIO:
- dprintf("handle_mmio\n");
+ DPRINTF("handle_mmio\n");
cpu_physical_memory_rw(run->mmio.phys_addr,
run->mmio.data,
run->mmio.len,
run->mmio.is_write);
- ret = 1;
+ ret = 0;
break;
case KVM_EXIT_IRQ_WINDOW_OPEN:
- dprintf("irq_window_open\n");
+ DPRINTF("irq_window_open\n");
+ ret = EXCP_INTERRUPT;
break;
case KVM_EXIT_SHUTDOWN:
- dprintf("shutdown\n");
+ DPRINTF("shutdown\n");
qemu_system_reset_request();
- ret = 1;
+ ret = EXCP_INTERRUPT;
break;
case KVM_EXIT_UNKNOWN:
- dprintf("kvm_exit_unknown\n");
- break;
- case KVM_EXIT_FAIL_ENTRY:
- dprintf("kvm_exit_fail_entry\n");
+ fprintf(stderr, "KVM: unknown exit, hardware reason %" PRIx64 "\n",
+ (uint64_t)run->hw.hardware_exit_reason);
+ ret = -1;
break;
- case KVM_EXIT_EXCEPTION:
- dprintf("kvm_exit_exception\n");
- break;
- case KVM_EXIT_DEBUG:
- dprintf("kvm_exit_debug\n");
+ case KVM_EXIT_INTERNAL_ERROR:
+ ret = kvm_handle_internal_error(env, run);
break;
default:
- dprintf("kvm_arch_handle_exit\n");
+ DPRINTF("kvm_arch_handle_exit\n");
ret = kvm_arch_handle_exit(env, run);
break;
}
- } while (ret > 0);
+ } while (ret == 0);
- if ((env->interrupt_request & CPU_INTERRUPT_EXIT)) {
- env->interrupt_request &= ~CPU_INTERRUPT_EXIT;
- env->exception_index = EXCP_INTERRUPT;
+ if (ret < 0) {
+ cpu_dump_state(env, stderr, fprintf, CPU_DUMP_CODE);
+ vm_stop(RSTATE_PANICKED);
}
+ env->exit_request = 0;
+ cpu_single_env = NULL;
return ret;
}
-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)phys_ram_base + slot->phys_offset;
- mem.flags = slot->flags;
-
- return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
-}
-
-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;
-
- /* KVM does not support read-only slots */
- phys_offset &= ~IO_MEM_ROM;
-
- mem = kvm_lookup_slot(s, start_addr);
- if (mem) {
- if ((flags == IO_MEM_UNASSIGNED) || (flags >= TLB_MMIO)) {
- mem->memory_size = 0;
- mem->start_addr = start_addr;
- mem->phys_offset = 0;
- mem->flags = 0;
-
- kvm_set_user_memory_region(s, mem);
- } else if (start_addr >= mem->start_addr &&
- (start_addr + size) <= (mem->start_addr +
- mem->memory_size)) {
- KVMSlot slot;
- target_phys_addr_t mem_start;
- ram_addr_t mem_size, mem_offset;
-
- /* Not splitting */
- if ((phys_offset - (start_addr - mem->start_addr)) ==
- mem->phys_offset)
- return;
-
- /* unregister whole slot */
- memcpy(&slot, mem, sizeof(slot));
- mem->memory_size = 0;
- kvm_set_user_memory_region(s, mem);
-
- /* register prefix slot */
- mem_start = slot.start_addr;
- mem_size = start_addr - slot.start_addr;
- mem_offset = slot.phys_offset;
- if (mem_size)
- kvm_set_phys_mem(mem_start, mem_size, mem_offset);
-
- /* register new slot */
- kvm_set_phys_mem(start_addr, size, phys_offset);
-
- /* register suffix slot */
- mem_start = start_addr + size;
- mem_offset += mem_size + size;
- mem_size = slot.memory_size - mem_size - size;
- if (mem_size)
- kvm_set_phys_mem(mem_start, mem_size, mem_offset);
-
- return;
- } else {
- printf("Registering overlapping slot\n");
- abort();
- }
- }
- /* 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;
-
- kvm_set_user_memory_region(s, mem);
- /* FIXME deal with errors */
-}
-
int kvm_ioctl(KVMState *s, int type, ...)
{
int ret;
va_end(ap);
ret = ioctl(s->fd, type, arg);
- if (ret == -1)
+ if (ret == -1) {
ret = -errno;
-
+ }
return ret;
}
va_end(ap);
ret = ioctl(s->vmfd, type, arg);
- if (ret == -1)
+ if (ret == -1) {
ret = -errno;
-
+ }
return ret;
}
va_end(ap);
ret = ioctl(env->kvm_fd, type, arg);
- if (ret == -1)
+ if (ret == -1) {
ret = -errno;
-
+ }
return ret;
}
+
+int kvm_has_sync_mmu(void)
+{
+ return kvm_check_extension(kvm_state, KVM_CAP_SYNC_MMU);
+}
+
+int kvm_has_vcpu_events(void)
+{
+ return kvm_state->vcpu_events;
+}
+
+int kvm_has_robust_singlestep(void)
+{
+ return kvm_state->robust_singlestep;
+}
+
+int kvm_has_debugregs(void)
+{
+ return kvm_state->debugregs;
+}
+
+int kvm_has_xsave(void)
+{
+ return kvm_state->xsave;
+}
+
+int kvm_has_xcrs(void)
+{
+ return kvm_state->xcrs;
+}
+
+int kvm_has_many_ioeventfds(void)
+{
+ if (!kvm_enabled()) {
+ return 0;
+ }
+ return kvm_state->many_ioeventfds;
+}
+
+void kvm_setup_guest_memory(void *start, size_t size)
+{
+ if (!kvm_has_sync_mmu()) {
+ int ret = qemu_madvise(start, size, QEMU_MADV_DONTFORK);
+
+ if (ret) {
+ perror("qemu_madvise");
+ fprintf(stderr,
+ "Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
+ exit(1);
+ }
+ }
+}
+
+#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);
+}
+
+struct kvm_set_guest_debug_data {
+ struct kvm_guest_debug dbg;
+ CPUState *env;
+ int err;
+};
+
+static void kvm_invoke_set_guest_debug(void *data)
+{
+ struct kvm_set_guest_debug_data *dbg_data = data;
+ CPUState *env = dbg_data->env;
+
+ dbg_data->err = kvm_vcpu_ioctl(env, KVM_SET_GUEST_DEBUG, &dbg_data->dbg);
+}
+
+int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap)
+{
+ struct kvm_set_guest_debug_data data;
+
+ data.dbg.control = reinject_trap;
+
+ if (env->singlestep_enabled) {
+ data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
+ }
+ kvm_arch_update_guest_debug(env, &data.dbg);
+ data.env = env;
+
+ run_on_cpu(env, kvm_invoke_set_guest_debug, &data);
+ return data.err;
+}
+
+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 = g_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) {
+ g_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);
+ g_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 */
+
+int kvm_set_signal_mask(CPUState *env, const sigset_t *sigset)
+{
+ struct kvm_signal_mask *sigmask;
+ int r;
+
+ if (!sigset) {
+ return kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, NULL);
+ }
+
+ sigmask = g_malloc(sizeof(*sigmask) + sizeof(*sigset));
+
+ sigmask->len = 8;
+ memcpy(sigmask->sigset, sigset, sizeof(*sigset));
+ r = kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, sigmask);
+ g_free(sigmask);
+
+ return r;
+}
+
+int kvm_set_ioeventfd_mmio_long(int fd, uint32_t addr, uint32_t val, bool assign)
+{
+ int ret;
+ struct kvm_ioeventfd iofd;
+
+ iofd.datamatch = val;
+ iofd.addr = addr;
+ iofd.len = 4;
+ iofd.flags = KVM_IOEVENTFD_FLAG_DATAMATCH;
+ iofd.fd = fd;
+
+ if (!kvm_enabled()) {
+ return -ENOSYS;
+ }
+
+ if (!assign) {
+ iofd.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
+ }
+
+ ret = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &iofd);
+
+ if (ret < 0) {
+ return -errno;
+ }
+
+ return 0;
+}
+
+int kvm_set_ioeventfd_pio_word(int fd, uint16_t addr, uint16_t val, bool assign)
+{
+ struct kvm_ioeventfd kick = {
+ .datamatch = val,
+ .addr = addr,
+ .len = 2,
+ .flags = KVM_IOEVENTFD_FLAG_DATAMATCH | KVM_IOEVENTFD_FLAG_PIO,
+ .fd = fd,
+ };
+ int r;
+ if (!kvm_enabled()) {
+ return -ENOSYS;
+ }
+ if (!assign) {
+ kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
+ }
+ r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
+ if (r < 0) {
+ return r;
+ }
+ return 0;
+}
+
+int kvm_on_sigbus_vcpu(CPUState *env, int code, void *addr)
+{
+ return kvm_arch_on_sigbus_vcpu(env, code, addr);
+}
+
+int kvm_on_sigbus(int code, void *addr)
+{
+ return kvm_arch_on_sigbus(code, addr);
+}
projects / qemu.git / blobdiff