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Merge commit 'quintela/migration-next-v5' into staging

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* commit '6c779f22a93cc6e4565b940ef616e3efc5b50ba5':
  Change ram_save_block to return -1 if there are no more changes
  ram: save_live_setup() we don't need to synchronize the dirty bitmap.
  ram: iterate phase
  ram: save_live_complete() only do one loop
  ram: save_live_setup() don't need to sent pages
  savevm: split save_live into stage2 and stage3
  savevm: split save_live_setup from save_live_state
  savevm: introduce is_active method
  savevm: Refactor cancel operation in its own operation
  savevm: remove SaveLiveStateHandler
  savevm: remove SaveSetParamsHandler
  savevm: Live migration handlers register the struct directly
  savevm: Use a struct to pass all handlers
This commit is contained in:
Anthony Liguori 2012-07-30 09:58:41 -05:00
commit e6a7671998
6 changed files with 260 additions and 162 deletions
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149
arch_init.c
View File

@ -186,11 +186,19 @@ static void save_block_hdr(QEMUFile *f, RAMBlock *block, ram_addr_t offset,
static RAMBlock *last_block;
static ram_addr_t last_offset;
/*
* ram_save_block: Writes a page of memory to the stream f
*
* Returns: 0: if the page hasn't changed
* -1: if there are no more dirty pages
* n: the amount of bytes written in other case
*/
static int ram_save_block(QEMUFile *f)
{
RAMBlock *block = last_block;
ram_addr_t offset = last_offset;
int bytes_sent = 0;
int bytes_sent = -1;
MemoryRegion *mr;
if (!block)
@ -298,50 +306,55 @@ static void migration_end(void)
memory_global_dirty_log_stop();
}
static void ram_migration_cancel(void *opaque)
{
migration_end();
}
#define MAX_WAIT 50 /* ms, half buffered_file limit */
int ram_save_live(QEMUFile *f, int stage, void *opaque)
static int ram_save_setup(QEMUFile *f, void *opaque)
{
ram_addr_t addr;
RAMBlock *block;
bytes_transferred = 0;
last_block = NULL;
last_offset = 0;
sort_ram_list();
/* Make sure all dirty bits are set */
QLIST_FOREACH(block, &ram_list.blocks, next) {
for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) {
if (!memory_region_get_dirty(block->mr, addr, TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION)) {
memory_region_set_dirty(block->mr, addr, TARGET_PAGE_SIZE);
}
}
}
memory_global_dirty_log_start();
qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
QLIST_FOREACH(block, &ram_list.blocks, next) {
qemu_put_byte(f, strlen(block->idstr));
qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr));
qemu_put_be64(f, block->length);
}
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
return 0;
}
static int ram_save_iterate(QEMUFile *f, void *opaque)
{
uint64_t bytes_transferred_last;
double bwidth = 0;
int ret;
int i;
if (stage < 0) {
migration_end();
return 0;
}
memory_global_sync_dirty_bitmap(get_system_memory());
if (stage == 1) {
RAMBlock *block;
bytes_transferred = 0;
last_block = NULL;
last_offset = 0;
sort_ram_list();
/* Make sure all dirty bits are set */
QLIST_FOREACH(block, &ram_list.blocks, next) {
for (addr = 0; addr < block->length; addr += TARGET_PAGE_SIZE) {
if (!memory_region_get_dirty(block->mr, addr, TARGET_PAGE_SIZE,
DIRTY_MEMORY_MIGRATION)) {
memory_region_set_dirty(block->mr, addr, TARGET_PAGE_SIZE);
}
}
}
memory_global_dirty_log_start();
qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
QLIST_FOREACH(block, &ram_list.blocks, next) {
qemu_put_byte(f, strlen(block->idstr));
qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr));
qemu_put_be64(f, block->length);
}
}
uint64_t expected_time;
bytes_transferred_last = bytes_transferred;
bwidth = qemu_get_clock_ns(rt_clock);
@ -351,10 +364,11 @@ int ram_save_live(QEMUFile *f, int stage, void *opaque)
int bytes_sent;
bytes_sent = ram_save_block(f);
bytes_transferred += bytes_sent;
if (bytes_sent == 0) { /* no more blocks */
/* no more blocks to sent */
if (bytes_sent < 0) {
break;
}
bytes_transferred += bytes_sent;
/* we want to check in the 1st loop, just in case it was the 1st time
and we had to sync the dirty bitmap.
qemu_get_clock_ns() is a bit expensive, so we only check each some
@ -384,31 +398,46 @@ int ram_save_live(QEMUFile *f, int stage, void *opaque)
bwidth = 0.000001;
}
/* try transferring iterative blocks of memory */
if (stage == 3) {
int bytes_sent;
/* flush all remaining blocks regardless of rate limiting */
while ((bytes_sent = ram_save_block(f)) != 0) {
bytes_transferred += bytes_sent;
}
memory_global_dirty_log_stop();
}
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
if (stage == 2) {
uint64_t expected_time;
expected_time = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
expected_time = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
DPRINTF("ram_save_live: expected(" PRIu64 ") <= max(" PRIu64 ")?\n",
expected_time, migrate_max_downtime());
DPRINTF("ram_save_live: expected(" PRIu64 ") <= max(" PRIu64 ")?\n",
expected_time, migrate_max_downtime());
if (expected_time <= migrate_max_downtime()) {
memory_global_sync_dirty_bitmap(get_system_memory());
expected_time = ram_save_remaining() * TARGET_PAGE_SIZE / bwidth;
return expected_time <= migrate_max_downtime();
}
return 0;
}
static int ram_save_complete(QEMUFile *f, void *opaque)
{
memory_global_sync_dirty_bitmap(get_system_memory());
/* try transferring iterative blocks of memory */
/* flush all remaining blocks regardless of rate limiting */
while (true) {
int bytes_sent;
bytes_sent = ram_save_block(f);
/* no more blocks to sent */
if (bytes_sent < 0) {
break;
}
bytes_transferred += bytes_sent;
}
memory_global_dirty_log_stop();
qemu_put_be64(f, RAM_SAVE_FLAG_EOS);
return 0;
}
static inline void *host_from_stream_offset(QEMUFile *f,
ram_addr_t offset,
int flags)
@ -439,7 +468,7 @@ static inline void *host_from_stream_offset(QEMUFile *f,
return NULL;
}
int ram_load(QEMUFile *f, void *opaque, int version_id)
static int ram_load(QEMUFile *f, void *opaque, int version_id)
{
ram_addr_t addr;
int flags, ret = 0;
@ -536,6 +565,14 @@ done:
return ret;
}
SaveVMHandlers savevm_ram_handlers = {
.save_live_setup = ram_save_setup,
.save_live_iterate = ram_save_iterate,
.save_live_complete = ram_save_complete,
.load_state = ram_load,
.cancel = ram_migration_cancel,
};
#ifdef HAS_AUDIO
struct soundhw {
const char *name;

171
block-migration.c
View File

@ -536,30 +536,22 @@ static void blk_mig_cleanup(void)
}
}
static int block_save_live(QEMUFile *f, int stage, void *opaque)
static void block_migration_cancel(void *opaque)
{
blk_mig_cleanup();
}
static int block_save_setup(QEMUFile *f, void *opaque)
{
int ret;
DPRINTF("Enter save live stage %d submitted %d transferred %d\n",
stage, block_mig_state.submitted, block_mig_state.transferred);
DPRINTF("Enter save live setup submitted %d transferred %d\n",
block_mig_state.submitted, block_mig_state.transferred);
if (stage < 0) {
blk_mig_cleanup();
return 0;
}
init_blk_migration(f);
if (block_mig_state.blk_enable != 1) {
/* no need to migrate storage */
qemu_put_be64(f, BLK_MIG_FLAG_EOS);
return 1;
}
if (stage == 1) {
init_blk_migration(f);
/* start track dirty blocks */
set_dirty_tracking(1);
}
/* start track dirty blocks */
set_dirty_tracking(1);
flush_blks(f);
@ -571,56 +563,98 @@ static int block_save_live(QEMUFile *f, int stage, void *opaque)
blk_mig_reset_dirty_cursor();
if (stage == 2) {
/* control the rate of transfer */
while ((block_mig_state.submitted +
block_mig_state.read_done) * BLOCK_SIZE <
qemu_file_get_rate_limit(f)) {
if (block_mig_state.bulk_completed == 0) {
/* first finish the bulk phase */
if (blk_mig_save_bulked_block(f) == 0) {
/* finished saving bulk on all devices */
block_mig_state.bulk_completed = 1;
}
} else {
if (blk_mig_save_dirty_block(f, 1) == 0) {
/* no more dirty blocks */
break;
}
qemu_put_be64(f, BLK_MIG_FLAG_EOS);
return 0;
}
static int block_save_iterate(QEMUFile *f, void *opaque)
{
int ret;
DPRINTF("Enter save live iterate submitted %d transferred %d\n",
block_mig_state.submitted, block_mig_state.transferred);
flush_blks(f);
ret = qemu_file_get_error(f);
if (ret) {
blk_mig_cleanup();
return ret;
}
blk_mig_reset_dirty_cursor();
/* control the rate of transfer */
while ((block_mig_state.submitted +
block_mig_state.read_done) * BLOCK_SIZE <
qemu_file_get_rate_limit(f)) {
if (block_mig_state.bulk_completed == 0) {
/* first finish the bulk phase */
if (blk_mig_save_bulked_block(f) == 0) {
/* finished saving bulk on all devices */
block_mig_state.bulk_completed = 1;
}
} else {
if (blk_mig_save_dirty_block(f, 1) == 0) {
/* no more dirty blocks */
break;
}
}
flush_blks(f);
ret = qemu_file_get_error(f);
if (ret) {
blk_mig_cleanup();
return ret;
}
}
if (stage == 3) {
/* we know for sure that save bulk is completed and
all async read completed */
assert(block_mig_state.submitted == 0);
flush_blks(f);
while (blk_mig_save_dirty_block(f, 0) != 0);
ret = qemu_file_get_error(f);
if (ret) {
blk_mig_cleanup();
/* report completion */
qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
ret = qemu_file_get_error(f);
if (ret) {
return ret;
}
DPRINTF("Block migration completed\n");
return ret;
}
qemu_put_be64(f, BLK_MIG_FLAG_EOS);
return ((stage == 2) && is_stage2_completed());
return is_stage2_completed();
}
static int block_save_complete(QEMUFile *f, void *opaque)
{
int ret;
DPRINTF("Enter save live complete submitted %d transferred %d\n",
block_mig_state.submitted, block_mig_state.transferred);
flush_blks(f);
ret = qemu_file_get_error(f);
if (ret) {
blk_mig_cleanup();
return ret;
}
blk_mig_reset_dirty_cursor();
/* we know for sure that save bulk is completed and
all async read completed */
assert(block_mig_state.submitted == 0);
while (blk_mig_save_dirty_block(f, 0) != 0) {
/* Do nothing */
}
blk_mig_cleanup();
/* report completion */
qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
ret = qemu_file_get_error(f);
if (ret) {
return ret;
}
DPRINTF("Block migration completed\n");
qemu_put_be64(f, BLK_MIG_FLAG_EOS);
return 0;
}
static int block_load(QEMUFile *f, void *opaque, int version_id)
@ -709,11 +743,26 @@ static void block_set_params(const MigrationParams *params, void *opaque)
block_mig_state.blk_enable |= params->shared;
}
static bool block_is_active(void *opaque)
{
return block_mig_state.blk_enable == 1;
}
SaveVMHandlers savevm_block_handlers = {
.set_params = block_set_params,
.save_live_setup = block_save_setup,
.save_live_iterate = block_save_iterate,
.save_live_complete = block_save_complete,
.load_state = block_load,
.cancel = block_migration_cancel,
.is_active = block_is_active,
};
void blk_mig_init(void)
{
QSIMPLEQ_INIT(&block_mig_state.bmds_list);
QSIMPLEQ_INIT(&block_mig_state.blk_list);
register_savevm_live(NULL, "block", 0, 1, block_set_params,
block_save_live, NULL, block_load, &block_mig_state);
register_savevm_live(NULL, "block", 0, 1, &savevm_block_handlers,
&block_mig_state);
}

4
migration.h
View File

@ -18,6 +18,7 @@
#include "qemu-common.h"
#include "notify.h"
#include "error.h"
#include "vmstate.h"
struct MigrationParams {
bool blk;
@ -81,8 +82,7 @@ uint64_t ram_bytes_remaining(void);
uint64_t ram_bytes_transferred(void);
uint64_t ram_bytes_total(void);
int ram_save_live(QEMUFile *f, int stage, void *opaque);
int ram_load(QEMUFile *f, void *opaque, int version_id);
extern SaveVMHandlers savevm_ram_handlers;
/**
* @migrate_add_blocker - prevent migration from proceeding

77
savevm.c
View File

@ -1171,10 +1171,7 @@ typedef struct SaveStateEntry {
int alias_id;
int version_id;
int section_id;
SaveSetParamsHandler *set_params;
SaveLiveStateHandler *save_live_state;
SaveStateHandler *save_state;
LoadStateHandler *load_state;
SaveVMHandlers *ops;
const VMStateDescription *vmsd;
void *opaque;
CompatEntry *compat;
@ -1226,10 +1223,7 @@ int register_savevm_live(DeviceState *dev,
const char *idstr,
int instance_id,
int version_id,
SaveSetParamsHandler *set_params,
SaveLiveStateHandler *save_live_state,
SaveStateHandler *save_state,
LoadStateHandler *load_state,
SaveVMHandlers *ops,
void *opaque)
{
SaveStateEntry *se;
@ -1237,15 +1231,12 @@ int register_savevm_live(DeviceState *dev,
se = g_malloc0(sizeof(SaveStateEntry));
se->version_id = version_id;
se->section_id = global_section_id++;
se->set_params = set_params;
se->save_live_state = save_live_state;
se->save_state = save_state;
se->load_state = load_state;
se->ops = ops;
se->opaque = opaque;
se->vmsd = NULL;
se->no_migrate = 0;
/* if this is a live_savem then set is_ram */
if (save_live_state != NULL) {
if (ops->save_live_setup != NULL) {
se->is_ram = 1;
}
@ -1284,8 +1275,11 @@ int register_savevm(DeviceState *dev,
LoadStateHandler *load_state,
void *opaque)
{
SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
ops->save_state = save_state;
ops->load_state = load_state;
return register_savevm_live(dev, idstr, instance_id, version_id,
NULL, NULL, save_state, load_state, opaque);
ops, opaque);
}
void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
@ -1309,6 +1303,7 @@ void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
if (se->compat) {
g_free(se->compat);
}
g_free(se->ops);
g_free(se);
}
}
@ -1327,9 +1322,6 @@ int vmstate_register_with_alias_id(DeviceState *dev, int instance_id,
se = g_malloc0(sizeof(SaveStateEntry));
se->version_id = vmsd->version_id;
se->section_id = global_section_id++;
se->save_live_state = NULL;
se->save_state = NULL;
se->load_state = NULL;
se->opaque = opaque;
se->vmsd = vmsd;
se->alias_id = alias_id;
@ -1524,7 +1516,7 @@ void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
{
if (!se->vmsd) { /* Old style */
return se->load_state(f, se->opaque, version_id);
return se->ops->load_state(f, se->opaque, version_id);
}
return vmstate_load_state(f, se->vmsd, se->opaque, version_id);
}
@ -1532,7 +1524,7 @@ static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
static void vmstate_save(QEMUFile *f, SaveStateEntry *se)
{
if (!se->vmsd) { /* Old style */
se->save_state(f, se->opaque);
se->ops->save_state(f, se->opaque);
return;
}
vmstate_save_state(f,se->vmsd, se->opaque);
@ -1569,10 +1561,10 @@ int qemu_savevm_state_begin(QEMUFile *f,
int ret;
QTAILQ_FOREACH(se, &savevm_handlers, entry) {
if(se->set_params == NULL) {
if (!se->ops || !se->ops->set_params) {
continue;
}
se->set_params(params, se->opaque);
se->ops->set_params(params, se->opaque);
}
qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
@ -1581,9 +1573,14 @@ int qemu_savevm_state_begin(QEMUFile *f,
QTAILQ_FOREACH(se, &savevm_handlers, entry) {
int len;
if (se->save_live_state == NULL)
if (!se->ops || !se->ops->save_live_setup) {
continue;
}
if (se->ops && se->ops->is_active) {
if (!se->ops->is_active(se->opaque)) {
continue;
}
}
/* Section type */
qemu_put_byte(f, QEMU_VM_SECTION_START);
qemu_put_be32(f, se->section_id);
@ -1596,7 +1593,7 @@ int qemu_savevm_state_begin(QEMUFile *f,
qemu_put_be32(f, se->instance_id);
qemu_put_be32(f, se->version_id);
ret = se->save_live_state(f, QEMU_VM_SECTION_START, se->opaque);
ret = se->ops->save_live_setup(f, se->opaque);
if (ret < 0) {
qemu_savevm_state_cancel(f);
return ret;
@ -1623,9 +1620,14 @@ int qemu_savevm_state_iterate(QEMUFile *f)
int ret = 1;
QTAILQ_FOREACH(se, &savevm_handlers, entry) {
if (se->save_live_state == NULL)
if (!se->ops || !se->ops->save_live_iterate) {
continue;
}
if (se->ops && se->ops->is_active) {
if (!se->ops->is_active(se->opaque)) {
continue;
}
}
if (qemu_file_rate_limit(f)) {
return 0;
}
@ -1634,7 +1636,7 @@ int qemu_savevm_state_iterate(QEMUFile *f)
qemu_put_byte(f, QEMU_VM_SECTION_PART);
qemu_put_be32(f, se->section_id);
ret = se->save_live_state(f, QEMU_VM_SECTION_PART, se->opaque);
ret = se->ops->save_live_iterate(f, se->opaque);
trace_savevm_section_end(se->section_id);
if (ret <= 0) {
@ -1663,15 +1665,20 @@ int qemu_savevm_state_complete(QEMUFile *f)
cpu_synchronize_all_states();
QTAILQ_FOREACH(se, &savevm_handlers, entry) {
if (se->save_live_state == NULL)
if (!se->ops || !se->ops->save_live_complete) {
continue;
}
if (se->ops && se->ops->is_active) {
if (!se->ops->is_active(se->opaque)) {
continue;
}
}
trace_savevm_section_start();
/* Section type */
qemu_put_byte(f, QEMU_VM_SECTION_END);
qemu_put_be32(f, se->section_id);
ret = se->save_live_state(f, QEMU_VM_SECTION_END, se->opaque);
ret = se->ops->save_live_complete(f, se->opaque);
trace_savevm_section_end(se->section_id);
if (ret < 0) {
return ret;
@ -1681,9 +1688,9 @@ int qemu_savevm_state_complete(QEMUFile *f)
QTAILQ_FOREACH(se, &savevm_handlers, entry) {
int len;
if (se->save_state == NULL && se->vmsd == NULL)
if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
continue;
}
trace_savevm_section_start();
/* Section type */
qemu_put_byte(f, QEMU_VM_SECTION_FULL);
@ -1711,8 +1718,8 @@ void qemu_savevm_state_cancel(QEMUFile *f)
SaveStateEntry *se;
QTAILQ_FOREACH(se, &savevm_handlers, entry) {
if (se->save_live_state) {
se->save_live_state(f, -1, se->opaque);
if (se->ops && se->ops->cancel) {
se->ops->cancel(se->opaque);
}
}
}
@ -1765,7 +1772,7 @@ static int qemu_save_device_state(QEMUFile *f)
if (se->is_ram) {
continue;
}
if (se->save_state == NULL && se->vmsd == NULL) {
if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
continue;
}

3
vl.c
View File

@ -3437,8 +3437,7 @@ int main(int argc, char **argv, char **envp)
default_drive(default_sdcard, snapshot, machine->use_scsi,
IF_SD, 0, SD_OPTS);
register_savevm_live(NULL, "ram", 0, 4, NULL, ram_save_live, NULL,
ram_load, NULL);
register_savevm_live(NULL, "ram", 0, 4, &savevm_ram_handlers, NULL);
if (nb_numa_nodes > 0) {
int i;

18
vmstate.h
View File

@ -26,11 +26,20 @@
#ifndef QEMU_VMSTATE_H
#define QEMU_VMSTATE_H 1
typedef void SaveSetParamsHandler(const MigrationParams *params, void * opaque);
typedef void SaveStateHandler(QEMUFile *f, void *opaque);
typedef int SaveLiveStateHandler(QEMUFile *f, int stage, void *opaque);
typedef int LoadStateHandler(QEMUFile *f, void *opaque, int version_id);
typedef struct SaveVMHandlers {
void (*set_params)(const MigrationParams *params, void * opaque);
SaveStateHandler *save_state;
int (*save_live_setup)(QEMUFile *f, void *opaque);
int (*save_live_iterate)(QEMUFile *f, void *opaque);
int (*save_live_complete)(QEMUFile *f, void *opaque);
void (*cancel)(void *opaque);
LoadStateHandler *load_state;
bool (*is_active)(void *opaque);
} SaveVMHandlers;
int register_savevm(DeviceState *dev,
const char *idstr,
int instance_id,
@ -43,10 +52,7 @@ int register_savevm_live(DeviceState *dev,
const char *idstr,
int instance_id,
int version_id,
SaveSetParamsHandler *set_params,
SaveLiveStateHandler *save_live_state,
SaveStateHandler *save_state,
LoadStateHandler *load_state,
SaveVMHandlers *ops,
void *opaque);
void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque);