#include "qemu-common.h"
#include "sysemu.h"
+#include "hw/hw.h"
#include "gdbstub.h"
#include "kvm.h"
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
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;
+}
+
static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot)
{
struct kvm_userspace_memory_region mem;
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);
}
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;
/*
* dirty pages logging control
*/
-static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr, target_phys_addr_t end_addr,
- unsigned flags,
- unsigned mask)
+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_slot(s, phys_addr);
+ KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size);
+ int old_flags;
+
if (mem == NULL) {
- dprintf("invalid parameters %llx-%llx\n", phys_addr, end_addr);
+ fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-"
+ TARGET_FMT_plx "\n", __func__, phys_addr,
+ phys_addr + size - 1);
return -EINVAL;
}
- flags = (mem->flags & ~mask) | flags;
- /* Nothing changed, no need to issue ioctl */
- if (flags == mem->flags)
- return 0;
+ 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, target_phys_addr_t end_addr)
+int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size)
{
- return kvm_dirty_pages_log_change(phys_addr, end_addr,
+ 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, target_phys_addr_t end_addr)
+int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size)
{
- return kvm_dirty_pages_log_change(phys_addr, end_addr,
+ 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. This is what we use to search the memslot
+ * @start_add: start of logged region.
* @end_addr: end of logged region.
*/
-void kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr, target_phys_addr_t end_addr)
+int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr,
+ target_phys_addr_t end_addr)
{
KVMState *s = kvm_state;
- KVMDirtyLog d;
- KVMSlot *mem = kvm_lookup_slot(s, start_addr);
- unsigned long alloc_size;
+ unsigned long size, allocated_size = 0;
+ target_phys_addr_t phys_addr;
ram_addr_t addr;
- target_phys_addr_t phys_addr = start_addr;
+ KVMDirtyLog d;
+ KVMSlot *mem;
+ int ret = 0;
- dprintf("sync addr: %llx into %lx\n", start_addr, mem->phys_offset);
- if (mem == NULL) {
- fprintf(stderr, "BUG: %s: invalid parameters\n", __func__);
- return;
- }
+ d.dirty_bitmap = NULL;
+ while (start_addr < end_addr) {
+ mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr);
+ if (mem == NULL) {
+ break;
+ }
- alloc_size = mem->memory_size >> TARGET_PAGE_BITS / sizeof(d.dirty_bitmap);
- d.dirty_bitmap = qemu_mallocz(alloc_size);
+ 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;
- dprintf("slot %d, phys_addr %llx, uaddr: %llx\n",
- d.slot, mem->start_addr, mem->phys_offset);
+ d.slot = mem->slot;
- if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
- dprintf("ioctl failed %d\n", errno);
- goto out;
- }
+ 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);
- phys_addr = start_addr;
- for (addr = mem->phys_offset; phys_addr < end_addr; phys_addr+= TARGET_PAGE_SIZE, addr += TARGET_PAGE_SIZE) {
- unsigned long *bitmap = (unsigned long *)d.dirty_bitmap;
- unsigned nr = (phys_addr - 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);
+ if ((bitmap[word] >> bit) & 1) {
+ cpu_physical_memory_set_dirty(addr);
+ }
+ }
+ start_addr = phys_addr;
}
-out:
qemu_free(d.dirty_bitmap);
+
+ return ret;
}
int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
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)
+ if (smp_cpus > 1) {
+ fprintf(stderr, "No SMP KVM support, use '-smp 1'\n");
return -EINVAL;
+ }
s = qemu_mallocz(sizeof(KVMState));
* just use a user allocated buffer so we can use regular pages
* 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");
+ 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. */
- ret = kvm_ioctl(s, KVM_CHECK_EXTENSION,
- KVM_CAP_DESTROY_MEMORY_REGION_WORKS);
- if (ret <= 0) {
- if (ret == 0)
- ret = -EINVAL;
+ if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) {
+ ret = -EINVAL;
fprintf(stderr,
- "KVM kernel module broken (DESTROY_MEMORY_REGION)\n"
- "Please upgrade to at least kvm-81.\n");
+ "KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s",
+ upgrade_note);
goto err;
}
- s->coalesced_mmio = 0;
#ifdef KVM_CAP_COALESCED_MMIO
- ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_COALESCED_MMIO);
- if (ret > 0)
- s->coalesced_mmio = ret;
+ 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;
{
KVMState *s = kvm_state;
ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
- KVMSlot *mem;
+ 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;
- 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;
+ 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;
- 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;
+ err = kvm_set_user_memory_region(s, mem);
+ if (err) {
+ fprintf(stderr, "%s: error updating slot: %s\n", __func__,
+ strerror(-err));
+ abort();
+ }
- /* unregister whole slot */
- memcpy(&slot, mem, sizeof(slot));
- mem->memory_size = 0;
- kvm_set_user_memory_region(s, mem);
+ start_addr += old.memory_size;
+ phys_offset += old.memory_size;
+ size -= old.memory_size;
+ continue;
+ }
- /* 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 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;
- /* register new slot */
- kvm_set_phys_mem(start_addr, size, phys_offset);
+ 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 */
- 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);
+ /* register suffix slot */
+ if (old.start_addr + old.memory_size > start_addr + size) {
+ ram_addr_t size_delta;
- return;
- } else {
- printf("Registering overlapping slot\n");
- abort();
+ 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->phys_offset = phys_offset;
mem->flags = 0;
- kvm_set_user_memory_region(s, mem);
- /* FIXME deal with errors */
+ 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, ...)
#ifdef KVM_CAP_SYNC_MMU
KVMState *s = kvm_state;
- if (kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_SYNC_MMU) > 0)
- return 1;
+ return kvm_check_extension(s, KVM_CAP_SYNC_MMU);
+#else
+ return 0;
#endif
+}
- return 0;
+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
projects / qemu / blobdiff