#include "qemu/osdep.h"
#include "cpu.h"
#include <zlib.h>
-#include "qapi-event.h"
#include "qemu/cutils.h"
#include "qemu/bitops.h"
#include "qemu/bitmap.h"
#include "xbzrle.h"
#include "ram.h"
#include "migration.h"
+#include "socket.h"
#include "migration/register.h"
#include "migration/misc.h"
#include "qemu-file.h"
#include "postcopy-ram.h"
-#include "migration/page_cache.h"
+#include "page_cache.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
+#include "qapi/qapi-events-migration.h"
#include "qapi/qmp/qerror.h"
#include "trace.h"
#include "exec/ram_addr.h"
#include "exec/target_page.h"
#include "qemu/rcu_queue.h"
#include "migration/colo.h"
-#include "migration/block.h"
+#include "block.h"
+#include "sysemu/sysemu.h"
+#include "qemu/uuid.h"
+#include "savevm.h"
/***********************************************************/
/* ram save/restore */
return ret;
}
+/* Should be holding either ram_list.mutex, or the RCU lock. */
+#define RAMBLOCK_FOREACH_MIGRATABLE(block) \
+ INTERNAL_RAMBLOCK_FOREACH(block) \
+ if (!qemu_ram_is_migratable(block)) {} else
+
+#undef RAMBLOCK_FOREACH
+
static void ramblock_recv_map_init(void)
{
RAMBlock *rb;
- RAMBLOCK_FOREACH(rb) {
+ RAMBLOCK_FOREACH_MIGRATABLE(rb) {
assert(!rb->receivedmap);
rb->receivedmap = bitmap_new(rb->max_length >> qemu_target_page_bits());
}
rb->receivedmap);
}
+bool ramblock_recv_bitmap_test_byte_offset(RAMBlock *rb, uint64_t byte_offset)
+{
+ return test_bit(byte_offset >> TARGET_PAGE_BITS, rb->receivedmap);
+}
+
void ramblock_recv_bitmap_set(RAMBlock *rb, void *host_addr)
{
set_bit_atomic(ramblock_recv_bitmap_offset(host_addr, rb), rb->receivedmap);
nr);
}
+#define RAMBLOCK_RECV_BITMAP_ENDING (0x0123456789abcdefULL)
+
+/*
+ * Format: bitmap_size (8 bytes) + whole_bitmap (N bytes).
+ *
+ * Returns >0 if success with sent bytes, or <0 if error.
+ */
+int64_t ramblock_recv_bitmap_send(QEMUFile *file,
+ const char *block_name)
+{
+ RAMBlock *block = qemu_ram_block_by_name(block_name);
+ unsigned long *le_bitmap, nbits;
+ uint64_t size;
+
+ if (!block) {
+ error_report("%s: invalid block name: %s", __func__, block_name);
+ return -1;
+ }
+
+ nbits = block->used_length >> TARGET_PAGE_BITS;
+
+ /*
+ * Make sure the tmp bitmap buffer is big enough, e.g., on 32bit
+ * machines we may need 4 more bytes for padding (see below
+ * comment). So extend it a bit before hand.
+ */
+ le_bitmap = bitmap_new(nbits + BITS_PER_LONG);
+
+ /*
+ * Always use little endian when sending the bitmap. This is
+ * required that when source and destination VMs are not using the
+ * same endianess. (Note: big endian won't work.)
+ */
+ bitmap_to_le(le_bitmap, block->receivedmap, nbits);
+
+ /* Size of the bitmap, in bytes */
+ size = nbits / 8;
+
+ /*
+ * size is always aligned to 8 bytes for 64bit machines, but it
+ * may not be true for 32bit machines. We need this padding to
+ * make sure the migration can survive even between 32bit and
+ * 64bit machines.
+ */
+ size = ROUND_UP(size, 8);
+
+ qemu_put_be64(file, size);
+ qemu_put_buffer(file, (const uint8_t *)le_bitmap, size);
+ /*
+ * Mark as an end, in case the middle part is screwed up due to
+ * some "misterious" reason.
+ */
+ qemu_put_be64(file, RAMBLOCK_RECV_BITMAP_ENDING);
+ qemu_fflush(file);
+
+ g_free(le_bitmap);
+
+ if (qemu_file_get_error(file)) {
+ return qemu_file_get_error(file);
+ }
+
+ return size + sizeof(size);
+}
+
/*
* An outstanding page request, on the source, having been received
* and queued
QemuCond cond;
RAMBlock *block;
ram_addr_t offset;
+
+ /* internally used fields */
+ z_stream stream;
+ uint8_t *originbuf;
};
typedef struct CompressParam CompressParam;
void *des;
uint8_t *compbuf;
int len;
+ z_stream stream;
};
typedef struct DecompressParam DecompressParam;
/* The empty QEMUFileOps will be used by file in CompressParam */
static const QEMUFileOps empty_ops = { };
+static QEMUFile *decomp_file;
static DecompressParam *decomp_param;
static QemuThread *decompress_threads;
static QemuMutex decomp_done_lock;
static QemuCond decomp_done_cond;
-static int do_compress_ram_page(QEMUFile *f, RAMBlock *block,
- ram_addr_t offset);
+static int do_compress_ram_page(QEMUFile *f, z_stream *stream, RAMBlock *block,
+ ram_addr_t offset, uint8_t *source_buf);
static void *do_data_compress(void *opaque)
{
param->block = NULL;
qemu_mutex_unlock(¶m->mutex);
- do_compress_ram_page(param->file, block, offset);
+ do_compress_ram_page(param->file, ¶m->stream, block, offset,
+ param->originbuf);
qemu_mutex_lock(&comp_done_lock);
param->done = true;
terminate_compression_threads();
thread_count = migrate_compress_threads();
for (i = 0; i < thread_count; i++) {
+ /*
+ * we use it as a indicator which shows if the thread is
+ * properly init'd or not
+ */
+ if (!comp_param[i].file) {
+ break;
+ }
qemu_thread_join(compress_threads + i);
- qemu_fclose(comp_param[i].file);
qemu_mutex_destroy(&comp_param[i].mutex);
qemu_cond_destroy(&comp_param[i].cond);
+ deflateEnd(&comp_param[i].stream);
+ g_free(comp_param[i].originbuf);
+ qemu_fclose(comp_param[i].file);
+ comp_param[i].file = NULL;
}
qemu_mutex_destroy(&comp_done_lock);
qemu_cond_destroy(&comp_done_cond);
comp_param = NULL;
}
-static void compress_threads_save_setup(void)
+static int compress_threads_save_setup(void)
{
int i, thread_count;
if (!migrate_use_compression()) {
- return;
+ return 0;
}
thread_count = migrate_compress_threads();
compress_threads = g_new0(QemuThread, thread_count);
qemu_cond_init(&comp_done_cond);
qemu_mutex_init(&comp_done_lock);
for (i = 0; i < thread_count; i++) {
+ comp_param[i].originbuf = g_try_malloc(TARGET_PAGE_SIZE);
+ if (!comp_param[i].originbuf) {
+ goto exit;
+ }
+
+ if (deflateInit(&comp_param[i].stream,
+ migrate_compress_level()) != Z_OK) {
+ g_free(comp_param[i].originbuf);
+ goto exit;
+ }
+
/* comp_param[i].file is just used as a dummy buffer to save data,
* set its ops to empty.
*/
do_data_compress, comp_param + i,
QEMU_THREAD_JOINABLE);
}
+ return 0;
+
+exit:
+ compress_threads_save_cleanup();
+ return -1;
}
/* Multiple fd's */
-struct MultiFDSendParams {
+#define MULTIFD_MAGIC 0x11223344U
+#define MULTIFD_VERSION 1
+
+typedef struct {
+ uint32_t magic;
+ uint32_t version;
+ unsigned char uuid[16]; /* QemuUUID */
uint8_t id;
+} __attribute__((packed)) MultiFDInit_t;
+
+typedef struct {
+ /* this fields are not changed once the thread is created */
+ /* channel number */
+ uint8_t id;
+ /* channel thread name */
char *name;
+ /* channel thread id */
QemuThread thread;
+ /* communication channel */
+ QIOChannel *c;
+ /* sem where to wait for more work */
QemuSemaphore sem;
+ /* this mutex protects the following parameters */
QemuMutex mutex;
+ /* is this channel thread running */
+ bool running;
+ /* should this thread finish */
bool quit;
-};
-typedef struct MultiFDSendParams MultiFDSendParams;
+} MultiFDSendParams;
+
+typedef struct {
+ /* this fields are not changed once the thread is created */
+ /* channel number */
+ uint8_t id;
+ /* channel thread name */
+ char *name;
+ /* channel thread id */
+ QemuThread thread;
+ /* communication channel */
+ QIOChannel *c;
+ /* sem where to wait for more work */
+ QemuSemaphore sem;
+ /* this mutex protects the following parameters */
+ QemuMutex mutex;
+ /* is this channel thread running */
+ bool running;
+ /* should this thread finish */
+ bool quit;
+} MultiFDRecvParams;
+
+static int multifd_send_initial_packet(MultiFDSendParams *p, Error **errp)
+{
+ MultiFDInit_t msg;
+ int ret;
+
+ msg.magic = cpu_to_be32(MULTIFD_MAGIC);
+ msg.version = cpu_to_be32(MULTIFD_VERSION);
+ msg.id = p->id;
+ memcpy(msg.uuid, &qemu_uuid.data, sizeof(msg.uuid));
+
+ ret = qio_channel_write_all(p->c, (char *)&msg, sizeof(msg), errp);
+ if (ret != 0) {
+ return -1;
+ }
+ return 0;
+}
+
+static int multifd_recv_initial_packet(QIOChannel *c, Error **errp)
+{
+ MultiFDInit_t msg;
+ int ret;
+
+ ret = qio_channel_read_all(c, (char *)&msg, sizeof(msg), errp);
+ if (ret != 0) {
+ return -1;
+ }
+
+ be32_to_cpus(&msg.magic);
+ be32_to_cpus(&msg.version);
+
+ if (msg.magic != MULTIFD_MAGIC) {
+ error_setg(errp, "multifd: received packet magic %x "
+ "expected %x", msg.magic, MULTIFD_MAGIC);
+ return -1;
+ }
+
+ if (msg.version != MULTIFD_VERSION) {
+ error_setg(errp, "multifd: received packet version %d "
+ "expected %d", msg.version, MULTIFD_VERSION);
+ return -1;
+ }
+
+ if (memcmp(msg.uuid, &qemu_uuid, sizeof(qemu_uuid))) {
+ char *uuid = qemu_uuid_unparse_strdup(&qemu_uuid);
+ char *msg_uuid = qemu_uuid_unparse_strdup((const QemuUUID *)msg.uuid);
+
+ error_setg(errp, "multifd: received uuid '%s' and expected "
+ "uuid '%s' for channel %hhd", msg_uuid, uuid, msg.id);
+ g_free(uuid);
+ g_free(msg_uuid);
+ return -1;
+ }
+
+ if (msg.id > migrate_multifd_channels()) {
+ error_setg(errp, "multifd: received channel version %d "
+ "expected %d", msg.version, MULTIFD_VERSION);
+ return -1;
+ }
+
+ return msg.id;
+}
struct {
MultiFDSendParams *params;
int count;
} *multifd_send_state;
-static void terminate_multifd_send_threads(Error *errp)
+static void multifd_send_terminate_threads(Error *err)
{
int i;
- for (i = 0; i < multifd_send_state->count; i++) {
+ if (err) {
+ MigrationState *s = migrate_get_current();
+ migrate_set_error(s, err);
+ if (s->state == MIGRATION_STATUS_SETUP ||
+ s->state == MIGRATION_STATUS_PRE_SWITCHOVER ||
+ s->state == MIGRATION_STATUS_DEVICE ||
+ s->state == MIGRATION_STATUS_ACTIVE) {
+ migrate_set_state(&s->state, s->state,
+ MIGRATION_STATUS_FAILED);
+ }
+ }
+
+ for (i = 0; i < migrate_multifd_channels(); i++) {
MultiFDSendParams *p = &multifd_send_state->params[i];
qemu_mutex_lock(&p->mutex);
if (!migrate_use_multifd()) {
return 0;
}
- terminate_multifd_send_threads(NULL);
- for (i = 0; i < multifd_send_state->count; i++) {
+ multifd_send_terminate_threads(NULL);
+ for (i = 0; i < migrate_multifd_channels(); i++) {
MultiFDSendParams *p = &multifd_send_state->params[i];
- qemu_thread_join(&p->thread);
+ if (p->running) {
+ qemu_thread_join(&p->thread);
+ }
+ socket_send_channel_destroy(p->c);
+ p->c = NULL;
qemu_mutex_destroy(&p->mutex);
qemu_sem_destroy(&p->sem);
g_free(p->name);
static void *multifd_send_thread(void *opaque)
{
MultiFDSendParams *p = opaque;
+ Error *local_err = NULL;
+
+ if (multifd_send_initial_packet(p, &local_err) < 0) {
+ goto out;
+ }
while (true) {
qemu_mutex_lock(&p->mutex);
qemu_sem_wait(&p->sem);
}
+out:
+ if (local_err) {
+ multifd_send_terminate_threads(local_err);
+ }
+
+ qemu_mutex_lock(&p->mutex);
+ p->running = false;
+ qemu_mutex_unlock(&p->mutex);
+
return NULL;
}
+static void multifd_new_send_channel_async(QIOTask *task, gpointer opaque)
+{
+ MultiFDSendParams *p = opaque;
+ QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
+ Error *local_err = NULL;
+
+ if (qio_task_propagate_error(task, &local_err)) {
+ if (multifd_save_cleanup(&local_err) != 0) {
+ migrate_set_error(migrate_get_current(), local_err);
+ }
+ } else {
+ p->c = QIO_CHANNEL(sioc);
+ qio_channel_set_delay(p->c, false);
+ p->running = true;
+ qemu_thread_create(&p->thread, p->name, multifd_send_thread, p,
+ QEMU_THREAD_JOINABLE);
+
+ atomic_inc(&multifd_send_state->count);
+ }
+}
+
int multifd_save_setup(void)
{
int thread_count;
thread_count = migrate_multifd_channels();
multifd_send_state = g_malloc0(sizeof(*multifd_send_state));
multifd_send_state->params = g_new0(MultiFDSendParams, thread_count);
- multifd_send_state->count = 0;
+ atomic_set(&multifd_send_state->count, 0);
for (i = 0; i < thread_count; i++) {
MultiFDSendParams *p = &multifd_send_state->params[i];
p->quit = false;
p->id = i;
p->name = g_strdup_printf("multifdsend_%d", i);
- qemu_thread_create(&p->thread, p->name, multifd_send_thread, p,
- QEMU_THREAD_JOINABLE);
-
- multifd_send_state->count++;
+ socket_send_channel_create(multifd_new_send_channel_async, p);
}
return 0;
}
-struct MultiFDRecvParams {
- uint8_t id;
- char *name;
- QemuThread thread;
- QemuSemaphore sem;
- QemuMutex mutex;
- bool quit;
-};
-typedef struct MultiFDRecvParams MultiFDRecvParams;
-
struct {
MultiFDRecvParams *params;
/* number of created threads */
int count;
} *multifd_recv_state;
-static void terminate_multifd_recv_threads(Error *errp)
+static void multifd_recv_terminate_threads(Error *err)
{
int i;
- for (i = 0; i < multifd_recv_state->count; i++) {
+ if (err) {
+ MigrationState *s = migrate_get_current();
+ migrate_set_error(s, err);
+ if (s->state == MIGRATION_STATUS_SETUP ||
+ s->state == MIGRATION_STATUS_ACTIVE) {
+ migrate_set_state(&s->state, s->state,
+ MIGRATION_STATUS_FAILED);
+ }
+ }
+
+ for (i = 0; i < migrate_multifd_channels(); i++) {
MultiFDRecvParams *p = &multifd_recv_state->params[i];
qemu_mutex_lock(&p->mutex);
if (!migrate_use_multifd()) {
return 0;
}
- terminate_multifd_recv_threads(NULL);
- for (i = 0; i < multifd_recv_state->count; i++) {
+ multifd_recv_terminate_threads(NULL);
+ for (i = 0; i < migrate_multifd_channels(); i++) {
MultiFDRecvParams *p = &multifd_recv_state->params[i];
- qemu_thread_join(&p->thread);
+ if (p->running) {
+ qemu_thread_join(&p->thread);
+ }
+ object_unref(OBJECT(p->c));
+ p->c = NULL;
qemu_mutex_destroy(&p->mutex);
qemu_sem_destroy(&p->sem);
g_free(p->name);
qemu_sem_wait(&p->sem);
}
+ qemu_mutex_lock(&p->mutex);
+ p->running = false;
+ qemu_mutex_unlock(&p->mutex);
+
return NULL;
}
thread_count = migrate_multifd_channels();
multifd_recv_state = g_malloc0(sizeof(*multifd_recv_state));
multifd_recv_state->params = g_new0(MultiFDRecvParams, thread_count);
- multifd_recv_state->count = 0;
+ atomic_set(&multifd_recv_state->count, 0);
for (i = 0; i < thread_count; i++) {
MultiFDRecvParams *p = &multifd_recv_state->params[i];
p->quit = false;
p->id = i;
p->name = g_strdup_printf("multifdrecv_%d", i);
- qemu_thread_create(&p->thread, p->name, multifd_recv_thread, p,
- QEMU_THREAD_JOINABLE);
- multifd_recv_state->count++;
}
return 0;
}
+bool multifd_recv_all_channels_created(void)
+{
+ int thread_count = migrate_multifd_channels();
+
+ if (!migrate_use_multifd()) {
+ return true;
+ }
+
+ return thread_count == atomic_read(&multifd_recv_state->count);
+}
+
+void multifd_recv_new_channel(QIOChannel *ioc)
+{
+ MultiFDRecvParams *p;
+ Error *local_err = NULL;
+ int id;
+
+ id = multifd_recv_initial_packet(ioc, &local_err);
+ if (id < 0) {
+ multifd_recv_terminate_threads(local_err);
+ return;
+ }
+
+ p = &multifd_recv_state->params[id];
+ if (p->c != NULL) {
+ error_setg(&local_err, "multifd: received id '%d' already setup'",
+ id);
+ multifd_recv_terminate_threads(local_err);
+ return;
+ }
+ p->c = ioc;
+ object_ref(OBJECT(ioc));
+
+ p->running = true;
+ qemu_thread_create(&p->thread, p->name, multifd_recv_thread, p,
+ QEMU_THREAD_JOINABLE);
+ atomic_inc(&multifd_recv_state->count);
+ if (multifd_recv_state->count == migrate_multifd_channels()) {
+ migration_incoming_process();
+ }
+}
+
/**
* save_page_header: write page header to wire
*
unsigned long *bitmap = rb->bmap;
unsigned long next;
+ if (!qemu_ram_is_migratable(rb)) {
+ return size;
+ }
+
if (rs->ram_bulk_stage && start > 0) {
next = start + 1;
} else {
RAMBlock *block;
uint64_t summary = 0;
- RAMBLOCK_FOREACH(block) {
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
summary |= block->page_size;
}
return summary;
}
+static void migration_update_rates(RAMState *rs, int64_t end_time)
+{
+ uint64_t iter_count = rs->iterations - rs->iterations_prev;
+
+ /* calculate period counters */
+ ram_counters.dirty_pages_rate = rs->num_dirty_pages_period * 1000
+ / (end_time - rs->time_last_bitmap_sync);
+
+ if (!iter_count) {
+ return;
+ }
+
+ if (migrate_use_xbzrle()) {
+ xbzrle_counters.cache_miss_rate = (double)(xbzrle_counters.cache_miss -
+ rs->xbzrle_cache_miss_prev) / iter_count;
+ rs->xbzrle_cache_miss_prev = xbzrle_counters.cache_miss;
+ }
+}
+
static void migration_bitmap_sync(RAMState *rs)
{
RAMBlock *block;
qemu_mutex_lock(&rs->bitmap_mutex);
rcu_read_lock();
- RAMBLOCK_FOREACH(block) {
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
migration_bitmap_sync_range(rs, block, 0, block->used_length);
}
+ ram_counters.remaining = ram_bytes_remaining();
rcu_read_unlock();
qemu_mutex_unlock(&rs->bitmap_mutex);
/* more than 1 second = 1000 millisecons */
if (end_time > rs->time_last_bitmap_sync + 1000) {
- /* calculate period counters */
- ram_counters.dirty_pages_rate = rs->num_dirty_pages_period * 1000
- / (end_time - rs->time_last_bitmap_sync);
bytes_xfer_now = ram_counters.transferred;
/* During block migration the auto-converge logic incorrectly detects
}
}
- if (migrate_use_xbzrle()) {
- if (rs->iterations_prev != rs->iterations) {
- xbzrle_counters.cache_miss_rate =
- (double)(xbzrle_counters.cache_miss -
- rs->xbzrle_cache_miss_prev) /
- (rs->iterations - rs->iterations_prev);
- }
- rs->iterations_prev = rs->iterations;
- rs->xbzrle_cache_miss_prev = xbzrle_counters.cache_miss;
- }
+ migration_update_rates(rs, end_time);
+
+ rs->iterations_prev = rs->iterations;
/* reset period counters */
rs->time_last_bitmap_sync = end_time;
ram_discard_range(rbname, offset, pages << TARGET_PAGE_BITS);
}
+/*
+ * @pages: the number of pages written by the control path,
+ * < 0 - error
+ * > 0 - number of pages written
+ *
+ * Return true if the pages has been saved, otherwise false is returned.
+ */
+static bool control_save_page(RAMState *rs, RAMBlock *block, ram_addr_t offset,
+ int *pages)
+{
+ uint64_t bytes_xmit = 0;
+ int ret;
+
+ *pages = -1;
+ ret = ram_control_save_page(rs->f, block->offset, offset, TARGET_PAGE_SIZE,
+ &bytes_xmit);
+ if (ret == RAM_SAVE_CONTROL_NOT_SUPP) {
+ return false;
+ }
+
+ if (bytes_xmit) {
+ ram_counters.transferred += bytes_xmit;
+ *pages = 1;
+ }
+
+ if (ret == RAM_SAVE_CONTROL_DELAYED) {
+ return true;
+ }
+
+ if (bytes_xmit > 0) {
+ ram_counters.normal++;
+ } else if (bytes_xmit == 0) {
+ ram_counters.duplicate++;
+ }
+
+ return true;
+}
+
+/*
+ * directly send the page to the stream
+ *
+ * Returns the number of pages written.
+ *
+ * @rs: current RAM state
+ * @block: block that contains the page we want to send
+ * @offset: offset inside the block for the page
+ * @buf: the page to be sent
+ * @async: send to page asyncly
+ */
+static int save_normal_page(RAMState *rs, RAMBlock *block, ram_addr_t offset,
+ uint8_t *buf, bool async)
+{
+ ram_counters.transferred += save_page_header(rs, rs->f, block,
+ offset | RAM_SAVE_FLAG_PAGE);
+ if (async) {
+ qemu_put_buffer_async(rs->f, buf, TARGET_PAGE_SIZE,
+ migrate_release_ram() &
+ migration_in_postcopy());
+ } else {
+ qemu_put_buffer(rs->f, buf, TARGET_PAGE_SIZE);
+ }
+ ram_counters.transferred += TARGET_PAGE_SIZE;
+ ram_counters.normal++;
+ return 1;
+}
+
/**
* ram_save_page: send the given page to the stream
*
static int ram_save_page(RAMState *rs, PageSearchStatus *pss, bool last_stage)
{
int pages = -1;
- uint64_t bytes_xmit;
- ram_addr_t current_addr;
uint8_t *p;
- int ret;
bool send_async = true;
RAMBlock *block = pss->block;
ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
+ ram_addr_t current_addr = block->offset + offset;
p = block->host + offset;
trace_ram_save_page(block->idstr, (uint64_t)offset, p);
- /* In doubt sent page as normal */
- bytes_xmit = 0;
- ret = ram_control_save_page(rs->f, block->offset,
- offset, TARGET_PAGE_SIZE, &bytes_xmit);
- if (bytes_xmit) {
- ram_counters.transferred += bytes_xmit;
- pages = 1;
- }
-
XBZRLE_cache_lock();
-
- current_addr = block->offset + offset;
-
- if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
- if (ret != RAM_SAVE_CONTROL_DELAYED) {
- if (bytes_xmit > 0) {
- ram_counters.normal++;
- } else if (bytes_xmit == 0) {
- ram_counters.duplicate++;
- }
- }
- } else {
- pages = save_zero_page(rs, block, offset);
- if (pages > 0) {
- /* Must let xbzrle know, otherwise a previous (now 0'd) cached
- * page would be stale
+ if (!rs->ram_bulk_stage && !migration_in_postcopy() &&
+ migrate_use_xbzrle()) {
+ pages = save_xbzrle_page(rs, &p, current_addr, block,
+ offset, last_stage);
+ if (!last_stage) {
+ /* Can't send this cached data async, since the cache page
+ * might get updated before it gets to the wire
*/
- xbzrle_cache_zero_page(rs, current_addr);
- ram_release_pages(block->idstr, offset, pages);
- } else if (!rs->ram_bulk_stage &&
- !migration_in_postcopy() && migrate_use_xbzrle()) {
- pages = save_xbzrle_page(rs, &p, current_addr, block,
- offset, last_stage);
- if (!last_stage) {
- /* Can't send this cached data async, since the cache page
- * might get updated before it gets to the wire
- */
- send_async = false;
- }
+ send_async = false;
}
}
/* XBZRLE overflow or normal page */
if (pages == -1) {
- ram_counters.transferred +=
- save_page_header(rs, rs->f, block, offset | RAM_SAVE_FLAG_PAGE);
- if (send_async) {
- qemu_put_buffer_async(rs->f, p, TARGET_PAGE_SIZE,
- migrate_release_ram() &
- migration_in_postcopy());
- } else {
- qemu_put_buffer(rs->f, p, TARGET_PAGE_SIZE);
- }
- ram_counters.transferred += TARGET_PAGE_SIZE;
- pages = 1;
- ram_counters.normal++;
+ pages = save_normal_page(rs, block, offset, p, send_async);
}
XBZRLE_cache_unlock();
return pages;
}
-static int do_compress_ram_page(QEMUFile *f, RAMBlock *block,
- ram_addr_t offset)
+static int do_compress_ram_page(QEMUFile *f, z_stream *stream, RAMBlock *block,
+ ram_addr_t offset, uint8_t *source_buf)
{
RAMState *rs = ram_state;
int bytes_sent, blen;
bytes_sent = save_page_header(rs, f, block, offset |
RAM_SAVE_FLAG_COMPRESS_PAGE);
- blen = qemu_put_compression_data(f, p, TARGET_PAGE_SIZE,
- migrate_compress_level());
+
+ /*
+ * copy it to a internal buffer to avoid it being modified by VM
+ * so that we can catch up the error during compression and
+ * decompression
+ */
+ memcpy(source_buf, p, TARGET_PAGE_SIZE);
+ blen = qemu_put_compression_data(f, stream, source_buf, TARGET_PAGE_SIZE);
if (blen < 0) {
bytes_sent = 0;
qemu_file_set_error(migrate_get_current()->to_dst_file, blen);
return pages;
}
-/**
- * ram_save_compressed_page: compress the given page and send it to the stream
- *
- * Returns the number of pages written.
- *
- * @rs: current RAM state
- * @block: block that contains the page we want to send
- * @offset: offset inside the block for the page
- * @last_stage: if we are at the completion stage
- */
-static int ram_save_compressed_page(RAMState *rs, PageSearchStatus *pss,
- bool last_stage)
-{
- int pages = -1;
- uint64_t bytes_xmit = 0;
- uint8_t *p;
- int ret, blen;
- RAMBlock *block = pss->block;
- ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
-
- p = block->host + offset;
-
- ret = ram_control_save_page(rs->f, block->offset,
- offset, TARGET_PAGE_SIZE, &bytes_xmit);
- if (bytes_xmit) {
- ram_counters.transferred += bytes_xmit;
- pages = 1;
- }
- if (ret != RAM_SAVE_CONTROL_NOT_SUPP) {
- if (ret != RAM_SAVE_CONTROL_DELAYED) {
- if (bytes_xmit > 0) {
- ram_counters.normal++;
- } else if (bytes_xmit == 0) {
- ram_counters.duplicate++;
- }
- }
- } else {
- /* When starting the process of a new block, the first page of
- * the block should be sent out before other pages in the same
- * block, and all the pages in last block should have been sent
- * out, keeping this order is important, because the 'cont' flag
- * is used to avoid resending the block name.
- */
- if (block != rs->last_sent_block) {
- flush_compressed_data(rs);
- pages = save_zero_page(rs, block, offset);
- if (pages == -1) {
- /* Make sure the first page is sent out before other pages */
- bytes_xmit = save_page_header(rs, rs->f, block, offset |
- RAM_SAVE_FLAG_COMPRESS_PAGE);
- blen = qemu_put_compression_data(rs->f, p, TARGET_PAGE_SIZE,
- migrate_compress_level());
- if (blen > 0) {
- ram_counters.transferred += bytes_xmit + blen;
- ram_counters.normal++;
- pages = 1;
- } else {
- qemu_file_set_error(rs->f, blen);
- error_report("compressed data failed!");
- }
- }
- if (pages > 0) {
- ram_release_pages(block->idstr, offset, pages);
- }
- } else {
- pages = save_zero_page(rs, block, offset);
- if (pages == -1) {
- pages = compress_page_with_multi_thread(rs, block, offset);
- } else {
- ram_release_pages(block->idstr, offset, pages);
- }
- }
- }
-
- return pages;
-}
-
/**
* find_dirty_block: find the next dirty page and update any state
* associated with the search process.
memory_region_unref(block->mr);
QSIMPLEQ_REMOVE_HEAD(&rs->src_page_requests, next_req);
g_free(entry);
+ migration_consume_urgent_request();
}
}
qemu_mutex_unlock(&rs->src_page_req_mutex);
memory_region_ref(ramblock->mr);
qemu_mutex_lock(&rs->src_page_req_mutex);
QSIMPLEQ_INSERT_TAIL(&rs->src_page_requests, new_entry, next_req);
+ migration_make_urgent_request();
qemu_mutex_unlock(&rs->src_page_req_mutex);
rcu_read_unlock();
return -1;
}
+static bool save_page_use_compression(RAMState *rs)
+{
+ if (!migrate_use_compression()) {
+ return false;
+ }
+
+ /*
+ * If xbzrle is on, stop using the data compression after first
+ * round of migration even if compression is enabled. In theory,
+ * xbzrle can do better than compression.
+ */
+ if (rs->ram_bulk_stage || !migrate_use_xbzrle()) {
+ return true;
+ }
+
+ return false;
+}
+
/**
* ram_save_target_page: save one target page
*
* Returns the number of pages written
*
* @rs: current RAM state
- * @ms: current migration state
* @pss: data about the page we want to send
* @last_stage: if we are at the completion stage
*/
static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss,
bool last_stage)
{
- int res = 0;
+ RAMBlock *block = pss->block;
+ ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
+ int res;
- /* Check the pages is dirty and if it is send it */
- if (migration_bitmap_clear_dirty(rs, pss->block, pss->page)) {
- /*
- * If xbzrle is on, stop using the data compression after first
- * round of migration even if compression is enabled. In theory,
- * xbzrle can do better than compression.
+ if (control_save_page(rs, block, offset, &res)) {
+ return res;
+ }
+
+ /*
+ * When starting the process of a new block, the first page of
+ * the block should be sent out before other pages in the same
+ * block, and all the pages in last block should have been sent
+ * out, keeping this order is important, because the 'cont' flag
+ * is used to avoid resending the block name.
+ */
+ if (block != rs->last_sent_block && save_page_use_compression(rs)) {
+ flush_compressed_data(rs);
+ }
+
+ res = save_zero_page(rs, block, offset);
+ if (res > 0) {
+ /* Must let xbzrle know, otherwise a previous (now 0'd) cached
+ * page would be stale
*/
- if (migrate_use_compression() &&
- (rs->ram_bulk_stage || !migrate_use_xbzrle())) {
- res = ram_save_compressed_page(rs, pss, last_stage);
- } else {
- res = ram_save_page(rs, pss, last_stage);
+ if (!save_page_use_compression(rs)) {
+ XBZRLE_cache_lock();
+ xbzrle_cache_zero_page(rs, block->offset + offset);
+ XBZRLE_cache_unlock();
}
+ ram_release_pages(block->idstr, offset, res);
+ return res;
+ }
- if (res < 0) {
- return res;
- }
- if (pss->block->unsentmap) {
- clear_bit(pss->page, pss->block->unsentmap);
- }
+ /*
+ * Make sure the first page is sent out before other pages.
+ *
+ * we post it as normal page as compression will take much
+ * CPU resource.
+ */
+ if (block == rs->last_sent_block && save_page_use_compression(rs)) {
+ return compress_page_with_multi_thread(rs, block, offset);
}
- return res;
+ return ram_save_page(rs, pss, last_stage);
}
/**
size_t pagesize_bits =
qemu_ram_pagesize(pss->block) >> TARGET_PAGE_BITS;
+ if (!qemu_ram_is_migratable(pss->block)) {
+ error_report("block %s should not be migrated !", pss->block->idstr);
+ return 0;
+ }
+
do {
+ /* Check the pages is dirty and if it is send it */
+ if (!migration_bitmap_clear_dirty(rs, pss->block, pss->page)) {
+ pss->page++;
+ continue;
+ }
+
tmppages = ram_save_target_page(rs, pss, last_stage);
if (tmppages < 0) {
return tmppages;
}
pages += tmppages;
+ if (pss->block->unsentmap) {
+ clear_bit(pss->page, pss->block->unsentmap);
+ }
+
pss->page++;
} while ((pss->page & (pagesize_bits - 1)) &&
offset_in_ramblock(pss->block, pss->page << TARGET_PAGE_BITS));
uint64_t total = 0;
rcu_read_lock();
- RAMBLOCK_FOREACH(block) {
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
total += block->used_length;
}
rcu_read_unlock();
*/
memory_global_dirty_log_stop();
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
g_free(block->bmap);
block->bmap = NULL;
g_free(block->unsentmap);
{
struct RAMBlock *block;
- RAMBLOCK_FOREACH(block) {
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
unsigned long *bitmap = block->bmap;
unsigned long range = block->used_length >> TARGET_PAGE_BITS;
unsigned long run_start = find_next_zero_bit(bitmap, range, 0);
struct RAMBlock *block;
int ret;
- RAMBLOCK_FOREACH(block) {
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
PostcopyDiscardState *pds =
postcopy_discard_send_init(ms, block->idstr);
rs->last_sent_block = NULL;
rs->last_page = 0;
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
unsigned long pages = block->used_length >> TARGET_PAGE_BITS;
unsigned long *bitmap = block->bmap;
unsigned long *unsentmap = block->unsentmap;
/* Skip setting bitmap if there is no RAM */
if (ram_bytes_total()) {
- QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
pages = block->max_length >> TARGET_PAGE_BITS;
block->bmap = bitmap_new(pages);
bitmap_set(block->bmap, 0, pages);
return 0;
}
+static void ram_state_resume_prepare(RAMState *rs, QEMUFile *out)
+{
+ RAMBlock *block;
+ uint64_t pages = 0;
+
+ /*
+ * Postcopy is not using xbzrle/compression, so no need for that.
+ * Also, since source are already halted, we don't need to care
+ * about dirty page logging as well.
+ */
+
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
+ pages += bitmap_count_one(block->bmap,
+ block->used_length >> TARGET_PAGE_BITS);
+ }
+
+ /* This may not be aligned with current bitmaps. Recalculate. */
+ rs->migration_dirty_pages = pages;
+
+ rs->last_seen_block = NULL;
+ rs->last_sent_block = NULL;
+ rs->last_page = 0;
+ rs->last_version = ram_list.version;
+ /*
+ * Disable the bulk stage, otherwise we'll resend the whole RAM no
+ * matter what we have sent.
+ */
+ rs->ram_bulk_stage = false;
+
+ /* Update RAMState cache of output QEMUFile */
+ rs->f = out;
+
+ trace_ram_state_resume_prepare(pages);
+}
+
/*
* Each of ram_save_setup, ram_save_iterate and ram_save_complete has
* long-running RCU critical section. When rcu-reclaims in the code
RAMState **rsp = opaque;
RAMBlock *block;
+ if (compress_threads_save_setup()) {
+ return -1;
+ }
+
/* migration has already setup the bitmap, reuse it. */
if (!migration_in_colo_state()) {
if (ram_init_all(rsp) != 0) {
+ compress_threads_save_cleanup();
return -1;
}
}
qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
- RAMBLOCK_FOREACH(block) {
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
qemu_put_byte(f, strlen(block->idstr));
qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr));
qemu_put_be64(f, block->used_length);
}
rcu_read_unlock();
- compress_threads_save_setup();
ram_control_before_iterate(f, RAM_CONTROL_SETUP);
ram_control_after_iterate(f, RAM_CONTROL_SETUP);
int64_t t0;
int done = 0;
+ if (blk_mig_bulk_active()) {
+ /* Avoid transferring ram during bulk phase of block migration as
+ * the bulk phase will usually take a long time and transferring
+ * ram updates during that time is pointless. */
+ goto out;
+ }
+
rcu_read_lock();
if (ram_list.version != rs->last_version) {
ram_state_reset(rs);
t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
i = 0;
- while ((ret = qemu_file_rate_limit(f)) == 0) {
+ while ((ret = qemu_file_rate_limit(f)) == 0 ||
+ !QSIMPLEQ_EMPTY(&rs->src_page_requests)) {
int pages;
+ if (qemu_file_get_error(f)) {
+ break;
+ }
+
pages = ram_find_and_save_block(rs, false);
/* no more pages to sent */
if (pages == 0) {
*/
ram_control_after_iterate(f, RAM_CONTROL_ROUND);
+out:
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
ram_counters.transferred += 8;
}
static void ram_save_pending(QEMUFile *f, void *opaque, uint64_t max_size,
- uint64_t *non_postcopiable_pending,
- uint64_t *postcopiable_pending)
+ uint64_t *res_precopy_only,
+ uint64_t *res_compatible,
+ uint64_t *res_postcopy_only)
{
RAMState **temp = opaque;
RAMState *rs = *temp;
if (migrate_postcopy_ram()) {
/* We can do postcopy, and all the data is postcopiable */
- *postcopiable_pending += remaining_size;
+ *res_compatible += remaining_size;
} else {
- *non_postcopiable_pending += remaining_size;
+ *res_precopy_only += remaining_size;
}
}
return NULL;
}
+ if (!qemu_ram_is_migratable(block)) {
+ error_report("block %s should not be migrated !", id);
+ return NULL;
+ }
+
return block;
}
}
}
+/* return the size after decompression, or negative value on error */
+static int
+qemu_uncompress_data(z_stream *stream, uint8_t *dest, size_t dest_len,
+ const uint8_t *source, size_t source_len)
+{
+ int err;
+
+ err = inflateReset(stream);
+ if (err != Z_OK) {
+ return -1;
+ }
+
+ stream->avail_in = source_len;
+ stream->next_in = (uint8_t *)source;
+ stream->avail_out = dest_len;
+ stream->next_out = dest;
+
+ err = inflate(stream, Z_NO_FLUSH);
+ if (err != Z_STREAM_END) {
+ return -1;
+ }
+
+ return stream->total_out;
+}
+
static void *do_data_decompress(void *opaque)
{
DecompressParam *param = opaque;
unsigned long pagesize;
uint8_t *des;
- int len;
+ int len, ret;
qemu_mutex_lock(¶m->mutex);
while (!param->quit) {
qemu_mutex_unlock(¶m->mutex);
pagesize = TARGET_PAGE_SIZE;
- /* uncompress() will return failed in some case, especially
- * when the page is dirted when doing the compression, it's
- * not a problem because the dirty page will be retransferred
- * and uncompress() won't break the data in other pages.
- */
- uncompress((Bytef *)des, &pagesize,
- (const Bytef *)param->compbuf, len);
+
+ ret = qemu_uncompress_data(¶m->stream, des, pagesize,
+ param->compbuf, len);
+ if (ret < 0 && migrate_get_current()->decompress_error_check) {
+ error_report("decompress data failed");
+ qemu_file_set_error(decomp_file, ret);
+ }
qemu_mutex_lock(&decomp_done_lock);
param->done = true;
return NULL;
}
-static void wait_for_decompress_done(void)
+static int wait_for_decompress_done(void)
{
int idx, thread_count;
if (!migrate_use_compression()) {
- return;
+ return 0;
}
thread_count = migrate_decompress_threads();
}
}
qemu_mutex_unlock(&decomp_done_lock);
-}
-
-static void compress_threads_load_setup(void)
-{
- int i, thread_count;
-
- if (!migrate_use_compression()) {
- return;
- }
- thread_count = migrate_decompress_threads();
- decompress_threads = g_new0(QemuThread, thread_count);
- decomp_param = g_new0(DecompressParam, thread_count);
- qemu_mutex_init(&decomp_done_lock);
- qemu_cond_init(&decomp_done_cond);
- for (i = 0; i < thread_count; i++) {
- qemu_mutex_init(&decomp_param[i].mutex);
- qemu_cond_init(&decomp_param[i].cond);
- decomp_param[i].compbuf = g_malloc0(compressBound(TARGET_PAGE_SIZE));
- decomp_param[i].done = true;
- decomp_param[i].quit = false;
- qemu_thread_create(decompress_threads + i, "decompress",
- do_data_decompress, decomp_param + i,
- QEMU_THREAD_JOINABLE);
- }
+ return qemu_file_get_error(decomp_file);
}
static void compress_threads_load_cleanup(void)
}
thread_count = migrate_decompress_threads();
for (i = 0; i < thread_count; i++) {
+ /*
+ * we use it as a indicator which shows if the thread is
+ * properly init'd or not
+ */
+ if (!decomp_param[i].compbuf) {
+ break;
+ }
+
qemu_mutex_lock(&decomp_param[i].mutex);
decomp_param[i].quit = true;
qemu_cond_signal(&decomp_param[i].cond);
qemu_mutex_unlock(&decomp_param[i].mutex);
}
for (i = 0; i < thread_count; i++) {
+ if (!decomp_param[i].compbuf) {
+ break;
+ }
+
qemu_thread_join(decompress_threads + i);
qemu_mutex_destroy(&decomp_param[i].mutex);
qemu_cond_destroy(&decomp_param[i].cond);
+ inflateEnd(&decomp_param[i].stream);
g_free(decomp_param[i].compbuf);
+ decomp_param[i].compbuf = NULL;
}
g_free(decompress_threads);
g_free(decomp_param);
decompress_threads = NULL;
decomp_param = NULL;
+ decomp_file = NULL;
+}
+
+static int compress_threads_load_setup(QEMUFile *f)
+{
+ int i, thread_count;
+
+ if (!migrate_use_compression()) {
+ return 0;
+ }
+
+ thread_count = migrate_decompress_threads();
+ decompress_threads = g_new0(QemuThread, thread_count);
+ decomp_param = g_new0(DecompressParam, thread_count);
+ qemu_mutex_init(&decomp_done_lock);
+ qemu_cond_init(&decomp_done_cond);
+ decomp_file = f;
+ for (i = 0; i < thread_count; i++) {
+ if (inflateInit(&decomp_param[i].stream) != Z_OK) {
+ goto exit;
+ }
+
+ decomp_param[i].compbuf = g_malloc0(compressBound(TARGET_PAGE_SIZE));
+ qemu_mutex_init(&decomp_param[i].mutex);
+ qemu_cond_init(&decomp_param[i].cond);
+ decomp_param[i].done = true;
+ decomp_param[i].quit = false;
+ qemu_thread_create(decompress_threads + i, "decompress",
+ do_data_decompress, decomp_param + i,
+ QEMU_THREAD_JOINABLE);
+ }
+ return 0;
+exit:
+ compress_threads_load_cleanup();
+ return -1;
}
static void decompress_data_with_multi_threads(QEMUFile *f,
*/
static int ram_load_setup(QEMUFile *f, void *opaque)
{
+ if (compress_threads_load_setup(f)) {
+ return -1;
+ }
+
xbzrle_load_setup();
- compress_threads_load_setup();
ramblock_recv_map_init();
return 0;
}
xbzrle_load_cleanup();
compress_threads_load_cleanup();
- RAMBLOCK_FOREACH(rb) {
+ RAMBLOCK_FOREACH_MIGRATABLE(rb) {
g_free(rb->receivedmap);
rb->receivedmap = NULL;
}
uint8_t ch;
addr = qemu_get_be64(f);
+
+ /*
+ * If qemu file error, we should stop here, and then "addr"
+ * may be invalid
+ */
+ ret = qemu_file_get_error(f);
+ if (ret) {
+ break;
+ }
+
flags = addr & ~TARGET_PAGE_MASK;
addr &= TARGET_PAGE_MASK;
error_report("Unknown combination of migration flags: %#x"
" (postcopy mode)", flags);
ret = -EINVAL;
+ break;
}
- if (place_needed) {
+ /* Detect for any possible file errors */
+ if (!ret && qemu_file_get_error(f)) {
+ ret = qemu_file_get_error(f);
+ }
+
+ if (!ret && place_needed) {
/* This gets called at the last target page in the host page */
void *place_dest = host + TARGET_PAGE_SIZE - block->page_size;
place_source, block);
}
}
- if (!ret) {
- ret = qemu_file_get_error(f);
- }
}
return ret;
length = qemu_get_be64(f);
block = qemu_ram_block_by_name(id);
- if (block) {
+ if (block && !qemu_ram_is_migratable(block)) {
+ error_report("block %s should not be migrated !", id);
+ ret = -EINVAL;
+ } else if (block) {
if (length != block->used_length) {
Error *local_err = NULL;
}
}
- wait_for_decompress_done();
+ ret |= wait_for_decompress_done();
rcu_read_unlock();
trace_ram_load_complete(ret, seq_iter);
return ret;
return migrate_postcopy_ram();
}
+/* Sync all the dirty bitmap with destination VM. */
+static int ram_dirty_bitmap_sync_all(MigrationState *s, RAMState *rs)
+{
+ RAMBlock *block;
+ QEMUFile *file = s->to_dst_file;
+ int ramblock_count = 0;
+
+ trace_ram_dirty_bitmap_sync_start();
+
+ RAMBLOCK_FOREACH_MIGRATABLE(block) {
+ qemu_savevm_send_recv_bitmap(file, block->idstr);
+ trace_ram_dirty_bitmap_request(block->idstr);
+ ramblock_count++;
+ }
+
+ trace_ram_dirty_bitmap_sync_wait();
+
+ /* Wait until all the ramblocks' dirty bitmap synced */
+ while (ramblock_count--) {
+ qemu_sem_wait(&s->rp_state.rp_sem);
+ }
+
+ trace_ram_dirty_bitmap_sync_complete();
+
+ return 0;
+}
+
+static void ram_dirty_bitmap_reload_notify(MigrationState *s)
+{
+ qemu_sem_post(&s->rp_state.rp_sem);
+}
+
+/*
+ * Read the received bitmap, revert it as the initial dirty bitmap.
+ * This is only used when the postcopy migration is paused but wants
+ * to resume from a middle point.
+ */
+int ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *block)
+{
+ int ret = -EINVAL;
+ QEMUFile *file = s->rp_state.from_dst_file;
+ unsigned long *le_bitmap, nbits = block->used_length >> TARGET_PAGE_BITS;
+ uint64_t local_size = nbits / 8;
+ uint64_t size, end_mark;
+
+ trace_ram_dirty_bitmap_reload_begin(block->idstr);
+
+ if (s->state != MIGRATION_STATUS_POSTCOPY_RECOVER) {
+ error_report("%s: incorrect state %s", __func__,
+ MigrationStatus_str(s->state));
+ return -EINVAL;
+ }
+
+ /*
+ * Note: see comments in ramblock_recv_bitmap_send() on why we
+ * need the endianess convertion, and the paddings.
+ */
+ local_size = ROUND_UP(local_size, 8);
+
+ /* Add paddings */
+ le_bitmap = bitmap_new(nbits + BITS_PER_LONG);
+
+ size = qemu_get_be64(file);
+
+ /* The size of the bitmap should match with our ramblock */
+ if (size != local_size) {
+ error_report("%s: ramblock '%s' bitmap size mismatch "
+ "(0x%"PRIx64" != 0x%"PRIx64")", __func__,
+ block->idstr, size, local_size);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ size = qemu_get_buffer(file, (uint8_t *)le_bitmap, local_size);
+ end_mark = qemu_get_be64(file);
+
+ ret = qemu_file_get_error(file);
+ if (ret || size != local_size) {
+ error_report("%s: read bitmap failed for ramblock '%s': %d"
+ " (size 0x%"PRIx64", got: 0x%"PRIx64")",
+ __func__, block->idstr, ret, local_size, size);
+ ret = -EIO;
+ goto out;
+ }
+
+ if (end_mark != RAMBLOCK_RECV_BITMAP_ENDING) {
+ error_report("%s: ramblock '%s' end mark incorrect: 0x%"PRIu64,
+ __func__, block->idstr, end_mark);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /*
+ * Endianess convertion. We are during postcopy (though paused).
+ * The dirty bitmap won't change. We can directly modify it.
+ */
+ bitmap_from_le(block->bmap, le_bitmap, nbits);
+
+ /*
+ * What we received is "received bitmap". Revert it as the initial
+ * dirty bitmap for this ramblock.
+ */
+ bitmap_complement(block->bmap, block->bmap, nbits);
+
+ trace_ram_dirty_bitmap_reload_complete(block->idstr);
+
+ /*
+ * We succeeded to sync bitmap for current ramblock. If this is
+ * the last one to sync, we need to notify the main send thread.
+ */
+ ram_dirty_bitmap_reload_notify(s);
+
+ ret = 0;
+out:
+ g_free(le_bitmap);
+ return ret;
+}
+
+static int ram_resume_prepare(MigrationState *s, void *opaque)
+{
+ RAMState *rs = *(RAMState **)opaque;
+ int ret;
+
+ ret = ram_dirty_bitmap_sync_all(s, rs);
+ if (ret) {
+ return ret;
+ }
+
+ ram_state_resume_prepare(rs, s->to_dst_file);
+
+ return 0;
+}
+
static SaveVMHandlers savevm_ram_handlers = {
.save_setup = ram_save_setup,
.save_live_iterate = ram_save_iterate,
.save_cleanup = ram_save_cleanup,
.load_setup = ram_load_setup,
.load_cleanup = ram_load_cleanup,
+ .resume_prepare = ram_resume_prepare,
};
void ram_mig_init(void)
projects / qemu.git / blobdiff