OpenE2K
/
qemu-e2k
13
4
Fork 0
Code Issues 4 Pull Requests Projects 2 Releases Activity

Merge remote-tracking branch 'quintela/migration.next' into staging 

# By Paolo Bonzini (40) and others
# Via Juan Quintela
* quintela/migration.next: (46 commits)
  page_cache: dup memory on insert
  page_cache: fix memory leak
  Fix cache_resize to keep old entry age
  Fix page_cache leak in cache_resize
  migration: inline migrate_fd_close
  migration: eliminate s->migration_file
  migration: move contents of migration_close to migrate_fd_cleanup
  migration: move rate limiting to QEMUFile
  migration: small changes around rate-limiting
  migration: use qemu_ftell to compute bandwidth
  migration: use QEMUFile for writing outgoing migration data
  migration: use QEMUFile for migration channel lifetime
  qemu-file: simplify and export qemu_ftell
  qemu-file: add writable socket QEMUFile
  qemu-file: check exit status when closing a pipe QEMUFile
  qemu-file: fsync a writable stdio QEMUFile
  migration: merge qemu_popen_cmd with qemu_popen
  migration: use qemu_file_rate_limit consistently
  migration: remove useless qemu_file_get_error check
  migration: detect error before sleeping
  ...
This commit is contained in:
Anthony Liguori 2013-03-11 08:30:34 -05:00
parent bba18e23f7 ee0b44aa9d
commit fe3cc14fd8
18 changed files with 405 additions and 627 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
arch_init.c
View File

@ -293,8 +293,7 @@ static int save_xbzrle_page(QEMUFile *f, uint8_t *current_data,
if (!cache_is_cached(XBZRLE.cache, current_addr)) {
if (!last_stage) {
cache_insert(XBZRLE.cache, current_addr,
g_memdup(current_data, TARGET_PAGE_SIZE));
cache_insert(XBZRLE.cache, current_addr, current_data);
}
acct_info.xbzrle_cache_miss++;
return -1;
@ -379,6 +378,8 @@ static inline bool migration_bitmap_set_dirty(MemoryRegion *mr,
return ret;
}
/* Needs iothread lock! */
static void migration_bitmap_sync(void)
{
RAMBlock *block;
@ -568,10 +569,6 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
bitmap_set(migration_bitmap, 0, ram_pages);
migration_dirty_pages = ram_pages;
qemu_mutex_lock_ramlist();
bytes_transferred = 0;
reset_ram_globals();
if (migrate_use_xbzrle()) {
XBZRLE.cache = cache_init(migrate_xbzrle_cache_size() /
TARGET_PAGE_SIZE,
@ -585,8 +582,14 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
acct_clear();
}
qemu_mutex_lock_iothread();
qemu_mutex_lock_ramlist();
bytes_transferred = 0;
reset_ram_globals();
memory_global_dirty_log_start();
migration_bitmap_sync();
qemu_mutex_unlock_iothread();
qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
@ -690,7 +693,9 @@ static uint64_t ram_save_pending(QEMUFile *f, void *opaque, uint64_t max_size)
remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE;
if (remaining_size < max_size) {
qemu_mutex_lock_iothread();
migration_bitmap_sync();
qemu_mutex_unlock_iothread();
remaining_size = ram_save_remaining() * TARGET_PAGE_SIZE;
}
return remaining_size;

167
block-migration.c
View File

@ -43,19 +43,24 @@
#endif
typedef struct BlkMigDevState {
/* Written during setup phase. Can be read without a lock. */
BlockDriverState *bs;
int bulk_completed;
int shared_base;
int64_t total_sectors;
QSIMPLEQ_ENTRY(BlkMigDevState) entry;
/* Only used by migration thread. Does not need a lock. */
int bulk_completed;
int64_t cur_sector;
int64_t cur_dirty;
int64_t completed_sectors;
int64_t total_sectors;
int64_t dirty;
QSIMPLEQ_ENTRY(BlkMigDevState) entry;
/* Protected by block migration lock. */
unsigned long *aio_bitmap;
int64_t completed_sectors;
} BlkMigDevState;
typedef struct BlkMigBlock {
/* Only used by migration thread. */
uint8_t *buf;
BlkMigDevState *bmds;
int64_t sector;
@ -63,26 +68,49 @@ typedef struct BlkMigBlock {
struct iovec iov;
QEMUIOVector qiov;
BlockDriverAIOCB *aiocb;
/* Protected by block migration lock. */
int ret;
QSIMPLEQ_ENTRY(BlkMigBlock) entry;
} BlkMigBlock;
typedef struct BlkMigState {
/* Written during setup phase. Can be read without a lock. */
int blk_enable;
int shared_base;
QSIMPLEQ_HEAD(bmds_list, BlkMigDevState) bmds_list;
int64_t total_sector_sum;
/* Protected by lock. */
QSIMPLEQ_HEAD(blk_list, BlkMigBlock) blk_list;
int submitted;
int read_done;
/* Only used by migration thread. Does not need a lock. */
int transferred;
int64_t total_sector_sum;
int prev_progress;
int bulk_completed;
long double prev_time_offset;
/* Lock must be taken _inside_ the iothread lock. */
QemuMutex lock;
} BlkMigState;
static BlkMigState block_mig_state;
static void blk_mig_lock(void)
{
qemu_mutex_lock(&block_mig_state.lock);
}
static void blk_mig_unlock(void)
{
qemu_mutex_unlock(&block_mig_state.lock);
}
/* Must run outside of the iothread lock during the bulk phase,
* or the VM will stall.
*/
static void blk_send(QEMUFile *f, BlkMigBlock * blk)
{
int len;
@ -109,9 +137,11 @@ uint64_t blk_mig_bytes_transferred(void)
BlkMigDevState *bmds;
uint64_t sum = 0;
blk_mig_lock();
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
sum += bmds->completed_sectors;
}
blk_mig_unlock();
return sum << BDRV_SECTOR_BITS;
}
@ -131,6 +161,9 @@ uint64_t blk_mig_bytes_total(void)
return sum << BDRV_SECTOR_BITS;
}
/* Called with migration lock held. */
static int bmds_aio_inflight(BlkMigDevState *bmds, int64_t sector)
{
int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
@ -143,6 +176,8 @@ static int bmds_aio_inflight(BlkMigDevState *bmds, int64_t sector)
}
}
/* Called with migration lock held. */
static void bmds_set_aio_inflight(BlkMigDevState *bmds, int64_t sector_num,
int nb_sectors, int set)
{
@ -177,23 +212,26 @@ static void alloc_aio_bitmap(BlkMigDevState *bmds)
bmds->aio_bitmap = g_malloc0(bitmap_size);
}
/* Never hold migration lock when yielding to the main loop! */
static void blk_mig_read_cb(void *opaque, int ret)
{
long double curr_time = qemu_get_clock_ns(rt_clock);
BlkMigBlock *blk = opaque;
blk_mig_lock();
blk->ret = ret;
block_mig_state.prev_time_offset = curr_time;
QSIMPLEQ_INSERT_TAIL(&block_mig_state.blk_list, blk, entry);
bmds_set_aio_inflight(blk->bmds, blk->sector, blk->nr_sectors, 0);
block_mig_state.submitted--;
block_mig_state.read_done++;
assert(block_mig_state.submitted >= 0);
blk_mig_unlock();
}
/* Called with no lock taken. */
static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
{
int64_t total_sectors = bmds->total_sectors;
@ -203,11 +241,13 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
int nr_sectors;
if (bmds->shared_base) {
qemu_mutex_lock_iothread();
while (cur_sector < total_sectors &&
!bdrv_is_allocated(bs, cur_sector, MAX_IS_ALLOCATED_SEARCH,
&nr_sectors)) {
cur_sector += nr_sectors;
}
qemu_mutex_unlock_iothread();
}
if (cur_sector >= total_sectors) {
@ -236,20 +276,23 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE;
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
if (block_mig_state.submitted == 0) {
block_mig_state.prev_time_offset = qemu_get_clock_ns(rt_clock);
}
blk_mig_lock();
block_mig_state.submitted++;
blk_mig_unlock();
qemu_mutex_lock_iothread();
blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov,
nr_sectors, blk_mig_read_cb, blk);
block_mig_state.submitted++;
bdrv_reset_dirty(bs, cur_sector, nr_sectors);
bmds->cur_sector = cur_sector + nr_sectors;
qemu_mutex_unlock_iothread();
bmds->cur_sector = cur_sector + nr_sectors;
return (bmds->cur_sector >= total_sectors);
}
/* Called with iothread lock taken. */
static void set_dirty_tracking(int enable)
{
BlkMigDevState *bmds;
@ -305,6 +348,8 @@ static void init_blk_migration(QEMUFile *f)
bdrv_iterate(init_blk_migration_it, NULL);
}
/* Called with no lock taken. */
static int blk_mig_save_bulked_block(QEMUFile *f)
{
int64_t completed_sector_sum = 0;
@ -351,6 +396,8 @@ static void blk_mig_reset_dirty_cursor(void)
}
}
/* Called with iothread lock taken. */
static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
int is_async)
{
@ -361,8 +408,12 @@ static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
int ret = -EIO;
for (sector = bmds->cur_dirty; sector < bmds->total_sectors;) {
blk_mig_lock();
if (bmds_aio_inflight(bmds, sector)) {
blk_mig_unlock();
bdrv_drain_all();
} else {
blk_mig_unlock();
}
if (bdrv_get_dirty(bmds->bs, sector)) {
@ -382,14 +433,13 @@ static int mig_save_device_dirty(QEMUFile *f, BlkMigDevState *bmds,
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE;
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
if (block_mig_state.submitted == 0) {
block_mig_state.prev_time_offset = qemu_get_clock_ns(rt_clock);
}
blk->aiocb = bdrv_aio_readv(bmds->bs, sector, &blk->qiov,
nr_sectors, blk_mig_read_cb, blk);
blk_mig_lock();
block_mig_state.submitted++;
bmds_set_aio_inflight(bmds, sector, nr_sectors, 1);
blk_mig_unlock();
} else {
ret = bdrv_read(bmds->bs, sector, blk->buf, nr_sectors);
if (ret < 0) {
@ -417,7 +467,9 @@ error:
return ret;
}
/* return value:
/* Called with iothread lock taken.
*
* return value:
* 0: too much data for max_downtime
* 1: few enough data for max_downtime
*/
@ -436,6 +488,8 @@ static int blk_mig_save_dirty_block(QEMUFile *f, int is_async)
return ret;
}
/* Called with no locks taken. */
static int flush_blks(QEMUFile *f)
{
BlkMigBlock *blk;
@ -445,6 +499,7 @@ static int flush_blks(QEMUFile *f)
__FUNCTION__, block_mig_state.submitted, block_mig_state.read_done,
block_mig_state.transferred);
blk_mig_lock();
while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) {
if (qemu_file_rate_limit(f)) {
break;
@ -453,9 +508,12 @@ static int flush_blks(QEMUFile *f)
ret = blk->ret;
break;
}
blk_send(f, blk);
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry);
blk_mig_unlock();
blk_send(f, blk);
blk_mig_lock();
g_free(blk->buf);
g_free(blk);
@ -463,6 +521,7 @@ static int flush_blks(QEMUFile *f)
block_mig_state.transferred++;
assert(block_mig_state.read_done >= 0);
}
blk_mig_unlock();
DPRINTF("%s Exit submitted %d read_done %d transferred %d\n", __FUNCTION__,
block_mig_state.submitted, block_mig_state.read_done,
@ -470,6 +529,8 @@ static int flush_blks(QEMUFile *f)
return ret;
}
/* Called with iothread lock taken. */
static int64_t get_remaining_dirty(void)
{
BlkMigDevState *bmds;
@ -482,6 +543,8 @@ static int64_t get_remaining_dirty(void)
return dirty << BDRV_SECTOR_BITS;
}
/* Called with iothread lock taken. */
static void blk_mig_cleanup(void)
{
BlkMigDevState *bmds;
@ -491,6 +554,7 @@ static void blk_mig_cleanup(void)
set_dirty_tracking(0);
blk_mig_lock();
while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) {
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.bmds_list, entry);
bdrv_set_in_use(bmds->bs, 0);
@ -504,6 +568,7 @@ static void blk_mig_cleanup(void)
g_free(blk->buf);
g_free(blk);
}
blk_mig_unlock();
}
static void block_migration_cancel(void *opaque)
@ -518,22 +583,18 @@ static int block_save_setup(QEMUFile *f, void *opaque)
DPRINTF("Enter save live setup submitted %d transferred %d\n",
block_mig_state.submitted, block_mig_state.transferred);
qemu_mutex_lock_iothread();
init_blk_migration(f);
/* start track dirty blocks */
set_dirty_tracking(1);
qemu_mutex_unlock_iothread();
ret = flush_blks(f);
if (ret) {
blk_mig_cleanup();
return ret;
}
blk_mig_reset_dirty_cursor();
qemu_put_be64(f, BLK_MIG_FLAG_EOS);
return 0;
return ret;
}
static int block_save_iterate(QEMUFile *f, void *opaque)
@ -546,46 +607,54 @@ static int block_save_iterate(QEMUFile *f, void *opaque)
ret = flush_blks(f);
if (ret) {
blk_mig_cleanup();
return ret;
}
blk_mig_reset_dirty_cursor();
/* control the rate of transfer */
blk_mig_lock();
while ((block_mig_state.submitted +
block_mig_state.read_done) * BLOCK_SIZE <
qemu_file_get_rate_limit(f)) {
blk_mig_unlock();
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;
}
ret = 0;
} else {
/* Always called with iothread lock taken for
* simplicity, block_save_complete also calls it.
*/
qemu_mutex_lock_iothread();
ret = blk_mig_save_dirty_block(f, 1);
if (ret != 0) {
/* no more dirty blocks */
break;
}
qemu_mutex_unlock_iothread();
}
if (ret < 0) {
return ret;
}
blk_mig_lock();
if (ret != 0) {
/* no more dirty blocks */
break;
}
}
if (ret < 0) {
blk_mig_cleanup();
return ret;
}
blk_mig_unlock();
ret = flush_blks(f);
if (ret) {
blk_mig_cleanup();
return ret;
}
qemu_put_be64(f, BLK_MIG_FLAG_EOS);
return qemu_ftell(f) - last_ftell;
}
/* Called with iothread lock taken. */
static int block_save_complete(QEMUFile *f, void *opaque)
{
int ret;
@ -595,7 +664,6 @@ static int block_save_complete(QEMUFile *f, void *opaque)
ret = flush_blks(f);
if (ret) {
blk_mig_cleanup();
return ret;
}
@ -603,16 +671,17 @@ static int block_save_complete(QEMUFile *f, void *opaque)
/* we know for sure that save bulk is completed and
all async read completed */
blk_mig_lock();
assert(block_mig_state.submitted == 0);
blk_mig_unlock();
do {
ret = blk_mig_save_dirty_block(f, 0);
if (ret < 0) {
return ret;
}
} while (ret == 0);
blk_mig_cleanup();
if (ret < 0) {
return ret;
}
/* report completion */
qemu_put_be64(f, (100 << BDRV_SECTOR_BITS) | BLK_MIG_FLAG_PROGRESS);
@ -620,13 +689,18 @@ static int block_save_complete(QEMUFile *f, void *opaque)
qemu_put_be64(f, BLK_MIG_FLAG_EOS);
blk_mig_cleanup();
return 0;
}
static uint64_t block_save_pending(QEMUFile *f, void *opaque, uint64_t max_size)
{
/* Estimate pending number of bytes to send */
uint64_t pending = get_remaining_dirty() +
uint64_t pending;
qemu_mutex_lock_iothread();
blk_mig_lock();
pending = get_remaining_dirty() +
block_mig_state.submitted * BLOCK_SIZE +
block_mig_state.read_done * BLOCK_SIZE;
@ -634,6 +708,8 @@ static uint64_t block_save_pending(QEMUFile *f, void *opaque, uint64_t max_size)
if (pending == 0 && !block_mig_state.bulk_completed) {
pending = BLOCK_SIZE;
}
blk_mig_unlock();
qemu_mutex_unlock_iothread();
DPRINTF("Enter save live pending %" PRIu64 "\n", pending);
return pending;
@ -745,6 +821,7 @@ void blk_mig_init(void)
{
QSIMPLEQ_INIT(&block_mig_state.bmds_list);
QSIMPLEQ_INIT(&block_mig_state.blk_list);
qemu_mutex_init(&block_mig_state.lock);
register_savevm_live(NULL, "block", 0, 1, &savevm_block_handlers,
&block_mig_state);

20
docs/migration.txt
View File

@ -55,10 +55,7 @@ QEMUFile with:
QEMUFile *qemu_fopen_ops(void *opaque,
QEMUFilePutBufferFunc *put_buffer,
QEMUFileGetBufferFunc *get_buffer,
QEMUFileCloseFunc *close,
QEMUFileRateLimit *rate_limit,
QEMUFileSetRateLimit *set_rate_limit,
QEMUFileGetRateLimit *get_rate_limit);
QEMUFileCloseFunc *close);
The functions have the following functionality:
@ -80,24 +77,9 @@ Close a file and return an error code.
typedef int (QEMUFileCloseFunc)(void *opaque);
Called to determine if the file has exceeded its bandwidth allocation. The
bandwidth capping is a soft limit, not a hard limit.
typedef int (QEMUFileRateLimit)(void *opaque);
Called to change the current bandwidth allocation. This function must return
the new actual bandwidth. It should be new_rate if everything goes OK, and
the old rate otherwise.
typedef size_t (QEMUFileSetRateLimit)(void *opaque, size_t new_rate);
typedef size_t (QEMUFileGetRateLimit)(void *opaque);
You can use any internal state that you need using the opaque void *
pointer that is passed to all functions.
The rate limiting functions are used to limit the bandwidth used by
QEMU migration.
The important functions for us are put_buffer()/get_buffer() that
allow to write/read a buffer into the QEMUFile.

12
include/migration/migration.h
View File

@ -34,18 +34,11 @@ struct MigrationState
int64_t bandwidth_limit;
size_t bytes_xfer;
size_t xfer_limit;
uint8_t *buffer;
size_t buffer_size;
size_t buffer_capacity;
QemuThread thread;
QEMUBH *cleanup_bh;
QEMUFile *file;
int fd;
int state;
int (*get_error)(MigrationState *s);
int (*close)(MigrationState *s);
int (*write)(MigrationState *s, const void *buff, size_t size);
void *opaque;
MigrationParams params;
int64_t total_time;
int64_t downtime;
@ -54,7 +47,6 @@ struct MigrationState
int64_t dirty_bytes_rate;
bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
int64_t xbzrle_cache_size;
bool complete;
};
void process_incoming_migration(QEMUFile *f);

3
include/migration/page_cache.h
View File

@ -57,7 +57,8 @@ bool cache_is_cached(const PageCache *cache, uint64_t addr);
uint8_t *get_cached_data(const PageCache *cache, uint64_t addr);
/**
* cache_insert: insert the page into the cache. the previous value will be overwritten
* cache_insert: insert the page into the cache. the page cache
* will dup the data on insert. the previous value will be overwritten
*
* @cache pointer to the PageCache struct
* @addr: page address

21
include/migration/qemu-file.h
View File

@ -51,33 +51,17 @@ typedef int (QEMUFileCloseFunc)(void *opaque);
*/
typedef int (QEMUFileGetFD)(void *opaque);
/* Called to determine if the file has exceeded its bandwidth allocation. The
* bandwidth capping is a soft limit, not a hard limit.
*/
typedef int (QEMUFileRateLimit)(void *opaque);
/* Called to change the current bandwidth allocation. This function must return
* the new actual bandwidth. It should be new_rate if everything goes ok, and
* the old rate otherwise
*/
typedef int64_t (QEMUFileSetRateLimit)(void *opaque, int64_t new_rate);
typedef int64_t (QEMUFileGetRateLimit)(void *opaque);
typedef struct QEMUFileOps {
QEMUFilePutBufferFunc *put_buffer;
QEMUFileGetBufferFunc *get_buffer;
QEMUFileCloseFunc *close;
QEMUFileGetFD *get_fd;
QEMUFileRateLimit *rate_limit;
QEMUFileSetRateLimit *set_rate_limit;
QEMUFileGetRateLimit *get_rate_limit;
} QEMUFileOps;
QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops);
QEMUFile *qemu_fopen(const char *filename, const char *mode);
QEMUFile *qemu_fdopen(int fd, const char *mode);
QEMUFile *qemu_fopen_socket(int fd);
QEMUFile *qemu_popen(FILE *popen_file, const char *mode);
QEMUFile *qemu_fopen_socket(int fd, const char *mode);
QEMUFile *qemu_popen_cmd(const char *command, const char *mode);
int qemu_get_fd(QEMUFile *f);
int qemu_fclose(QEMUFile *f);
@ -110,7 +94,8 @@ unsigned int qemu_get_be32(QEMUFile *f);
uint64_t qemu_get_be64(QEMUFile *f);
int qemu_file_rate_limit(QEMUFile *f);
int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate);
void qemu_file_reset_rate_limit(QEMUFile *f);
void qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate);
int64_t qemu_file_get_rate_limit(QEMUFile *f);
int qemu_file_get_error(QEMUFile *f);

23
include/migration/vmstate.h
View File

@ -32,15 +32,28 @@ typedef void SaveStateHandler(QEMUFile *f, void *opaque);
typedef int LoadStateHandler(QEMUFile *f, void *opaque, int version_id);
typedef struct SaveVMHandlers {
/* This runs inside the iothread lock. */
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);
uint64_t (*save_live_pending)(QEMUFile *f, void *opaque, uint64_t max_size);
void (*cancel)(void *opaque);
LoadStateHandler *load_state;
int (*save_live_complete)(QEMUFile *f, void *opaque);
/* This runs both outside and inside the iothread lock. */
bool (*is_active)(void *opaque);
/* This runs outside the iothread lock in the migration case, and
* within the lock in the savevm case. The callback had better only
* use data that is local to the migration thread or protected
* by other locks.
*/
int (*save_live_iterate)(QEMUFile *f, void *opaque);
/* This runs outside the iothread lock! */
int (*save_live_setup)(QEMUFile *f, void *opaque);
uint64_t (*save_live_pending)(QEMUFile *f, void *opaque, uint64_t max_size);
LoadStateHandler *load_state;
} SaveVMHandlers;
int register_savevm(DeviceState *dev,

1
include/qemu/atomic.h
View File

@ -16,6 +16,7 @@
*/
#define smp_wmb() barrier()
#define smp_rmb() barrier()
/*
* We use GCC builtin if it's available, as that can use
* mfence on 32 bit as well, e.g. if built with -march=pentium-m.

7
include/qemu/osdep.h
View File

@ -9,6 +9,13 @@
#include <sys/signal.h>
#endif
#ifndef _WIN32
#include <sys/wait.h>
#else
#define WIFEXITED(x) 1
#define WEXITSTATUS(x) (x)
#endif
#include <sys/time.h>
#if defined(CONFIG_SOLARIS) && CONFIG_SOLARIS_VERSION < 10

6
include/sysemu/sysemu.h
View File

@ -73,10 +73,10 @@ void do_info_snapshots(Monitor *mon, const QDict *qdict);
void qemu_announce_self(void);
bool qemu_savevm_state_blocked(Error **errp);
int qemu_savevm_state_begin(QEMUFile *f,
const MigrationParams *params);
void qemu_savevm_state_begin(QEMUFile *f,
const MigrationParams *params);
int qemu_savevm_state_iterate(QEMUFile *f);
int qemu_savevm_state_complete(QEMUFile *f);
void qemu_savevm_state_complete(QEMUFile *f);
void qemu_savevm_state_cancel(void);
uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size);
int qemu_loadvm_state(QEMUFile *f);

39
migration-exec.c
View File

@ -33,49 +33,14 @@
do { } while (0)
#endif
static int file_errno(MigrationState *s)
{
return errno;
}
static int file_write(MigrationState *s, const void * buf, size_t size)
{
return write(s->fd, buf, size);
}
static int exec_close(MigrationState *s)
{
int ret = 0;
DPRINTF("exec_close\n");
ret = qemu_fclose(s->opaque);
s->opaque = NULL;
s->fd = -1;
if (ret >= 0 && !(WIFEXITED(ret) && WEXITSTATUS(ret) == 0)) {
/* close succeeded, but non-zero exit code: */
ret = -EIO; /* fake errno value */
}
return ret;
}
void exec_start_outgoing_migration(MigrationState *s, const char *command, Error **errp)
{
FILE *f;
f = popen(command, "w");
if (f == NULL) {
s->file = qemu_popen_cmd(command, "w");
if (s->file == NULL) {
error_setg_errno(errp, errno, "failed to popen the migration target");
return;
}
s->fd = fileno(f);
assert(s->fd != -1);
s->opaque = qemu_popen(f, "w");
s->close = exec_close;
s->get_error = file_errno;
s->write = file_write;
migrate_fd_connect(s);
}

47
migration-fd.c
View File

@ -30,54 +30,13 @@
do { } while (0)
#endif
static int fd_errno(MigrationState *s)
{
return errno;
}
static int fd_write(MigrationState *s, const void * buf, size_t size)
{
return write(s->fd, buf, size);
}
static int fd_close(MigrationState *s)
{
struct stat st;
int ret;
DPRINTF("fd_close\n");
ret = fstat(s->fd, &st);
if (ret == 0 && S_ISREG(st.st_mode)) {
/*
* If the file handle is a regular file make sure the
* data is flushed to disk before signaling success.
*/
ret = fsync(s->fd);
if (ret != 0) {
ret = -errno;
perror("migration-fd: fsync");
return ret;
}
}
ret = close(s->fd);
s->fd = -1;
if (ret != 0) {
ret = -errno;
perror("migration-fd: close");
}
return ret;
}
void fd_start_outgoing_migration(MigrationState *s, const char *fdname, Error **errp)
{
s->fd = monitor_get_fd(cur_mon, fdname, errp);
if (s->fd == -1) {
int fd = monitor_get_fd(cur_mon, fdname, errp);
if (fd == -1) {
return;
}
s->get_error = fd_errno;
s->write = fd_write;
s->close = fd_close;
s->file = qemu_fdopen(fd, "wb");
migrate_fd_connect(s);
}

33
migration-tcp.c
View File

@ -29,49 +29,24 @@
do { } while (0)
#endif
static int socket_errno(MigrationState *s)
{
return socket_error();
}
static int socket_write(MigrationState *s, const void * buf, size_t size)
{
return send(s->fd, buf, size, 0);
}
static int tcp_close(MigrationState *s)
{
int r = 0;
DPRINTF("tcp_close\n");
if (closesocket(s->fd) < 0) {
r = -socket_error();
}
return r;
}
static void tcp_wait_for_connect(int fd, void *opaque)
{
MigrationState *s = opaque;
if (fd < 0) {
DPRINTF("migrate connect error\n");
s->fd = -1;
s->file = NULL;
migrate_fd_error(s);
} else {
DPRINTF("migrate connect success\n");
s->fd = fd;
socket_set_block(s->fd);
s->file = qemu_fopen_socket(fd, "wb");
migrate_fd_connect(s);
}
}
void tcp_start_outgoing_migration(MigrationState *s, const char *host_port, Error **errp)
{
s->get_error = socket_errno;
s->write = socket_write;
s->close = tcp_close;
s->fd = inet_nonblocking_connect(host_port, tcp_wait_for_connect, s, errp);
inet_nonblocking_connect(host_port, tcp_wait_for_connect, s, errp);
}
static void tcp_accept_incoming_migration(void *opaque)
@ -95,7 +70,7 @@ static void tcp_accept_incoming_migration(void *opaque)
goto out;
}
f = qemu_fopen_socket(c);
f = qemu_fopen_socket(c, "rb");
if (f == NULL) {
fprintf(stderr, "could not qemu_fopen socket\n");
goto out;

33
migration-unix.c
View File

@ -29,49 +29,24 @@
do { } while (0)
#endif
static int unix_errno(MigrationState *s)
{
return errno;
}
static int unix_write(MigrationState *s, const void * buf, size_t size)
{
return write(s->fd, buf, size);
}
static int unix_close(MigrationState *s)
{
int r = 0;
DPRINTF("unix_close\n");
if (close(s->fd) < 0) {
r = -errno;
}
return r;
}
static void unix_wait_for_connect(int fd, void *opaque)
{
MigrationState *s = opaque;
if (fd < 0) {
DPRINTF("migrate connect error\n");
s->fd = -1;
s->file = NULL;
migrate_fd_error(s);
} else {
DPRINTF("migrate connect success\n");
s->fd = fd;
socket_set_block(s->fd);
s->file = qemu_fopen_socket(fd, "wb");
migrate_fd_connect(s);
}
}
void unix_start_outgoing_migration(MigrationState *s, const char *path, Error **errp)
{
s->get_error = unix_errno;
s->write = unix_write;
s->close = unix_close;
s->fd = unix_nonblocking_connect(path, unix_wait_for_connect, s, errp);
unix_nonblocking_connect(path, unix_wait_for_connect, s, errp);
}
static void unix_accept_incoming_migration(void *opaque)
@ -95,7 +70,7 @@ static void unix_accept_incoming_migration(void *opaque)
goto out;
}
f = qemu_fopen_socket(c);
f = qemu_fopen_socket(c, "rb");
if (f == NULL) {
fprintf(stderr, "could not qemu_fopen socket\n");
goto out;

361
migration.c
View File

@ -23,6 +23,7 @@
#include "migration/block.h"
#include "qemu/thread.h"
#include "qmp-commands.h"
#include "trace.h"
//#define DEBUG_MIGRATION
@ -260,81 +261,54 @@ void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
/* shared migration helpers */
static int migrate_fd_cleanup(MigrationState *s)
static void migrate_fd_cleanup(void *opaque)
{
int ret = 0;
MigrationState *s = opaque;
qemu_bh_delete(s->cleanup_bh);
s->cleanup_bh = NULL;
if (s->file) {
DPRINTF("closing file\n");
ret = qemu_fclose(s->file);
qemu_mutex_unlock_iothread();
qemu_thread_join(&s->thread);
qemu_mutex_lock_iothread();
qemu_fclose(s->file);
s->file = NULL;
}
assert(s->fd == -1);
return ret;
assert(s->state != MIG_STATE_ACTIVE);
if (s->state != MIG_STATE_COMPLETED) {
qemu_savevm_state_cancel();
}
notifier_list_notify(&migration_state_notifiers, s);
}
static void migrate_finish_set_state(MigrationState *s, int new_state)
{
if (__sync_val_compare_and_swap(&s->state, MIG_STATE_ACTIVE,
new_state) == new_state) {
trace_migrate_set_state(new_state);
}
}
void migrate_fd_error(MigrationState *s)
{
DPRINTF("setting error state\n");
assert(s->file == NULL);
s->state = MIG_STATE_ERROR;
trace_migrate_set_state(MIG_STATE_ERROR);
notifier_list_notify(&migration_state_notifiers, s);
migrate_fd_cleanup(s);
}
static void migrate_fd_completed(MigrationState *s)
{
DPRINTF("setting completed state\n");
if (migrate_fd_cleanup(s) < 0) {
s->state = MIG_STATE_ERROR;
} else {
s->state = MIG_STATE_COMPLETED;
runstate_set(RUN_STATE_POSTMIGRATE);
}
notifier_list_notify(&migration_state_notifiers, s);
}
static ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data,
size_t size)
{
ssize_t ret;
if (s->state != MIG_STATE_ACTIVE) {
return -EIO;
}
do {
ret = s->write(s, data, size);
} while (ret == -1 && ((s->get_error(s)) == EINTR));
if (ret == -1)
ret = -(s->get_error(s));
return ret;
}
static void migrate_fd_cancel(MigrationState *s)
{
if (s->state != MIG_STATE_ACTIVE)
return;
DPRINTF("cancelling migration\n");
s->state = MIG_STATE_CANCELLED;
notifier_list_notify(&migration_state_notifiers, s);
qemu_savevm_state_cancel();
migrate_fd_cleanup(s);
}
int migrate_fd_close(MigrationState *s)
{
int rc = 0;
if (s->fd != -1) {
rc = s->close(s);
s->fd = -1;
}
return rc;
migrate_finish_set_state(s, MIG_STATE_CANCELLED);
}
void add_migration_state_change_notifier(Notifier *notify)
@ -382,8 +356,9 @@ static MigrationState *migrate_init(const MigrationParams *params)
s->bandwidth_limit = bandwidth_limit;
s->state = MIG_STATE_SETUP;
s->total_time = qemu_get_clock_ms(rt_clock);
trace_migrate_set_state(MIG_STATE_SETUP);
s->total_time = qemu_get_clock_ms(rt_clock);
return s;
}
@ -480,10 +455,15 @@ void qmp_migrate_set_speed(int64_t value, Error **errp)
if (value < 0) {
value = 0;
}
if (value > SIZE_MAX) {
value = SIZE_MAX;
}
s = migrate_get_current();
s->bandwidth_limit = value;
qemu_file_set_rate_limit(s->file, s->bandwidth_limit);
if (s->file) {
qemu_file_set_rate_limit(s->file, s->bandwidth_limit / XFER_LIMIT_RATIO);
}
}
void qmp_migrate_set_downtime(double value, Error **errp)
@ -513,224 +493,53 @@ int64_t migrate_xbzrle_cache_size(void)
/* migration thread support */
static ssize_t buffered_flush(MigrationState *s)
{
size_t offset = 0;
ssize_t ret = 0;
DPRINTF("flushing %zu byte(s) of data\n", s->buffer_size);
while (s->bytes_xfer < s->xfer_limit && offset < s->buffer_size) {
size_t to_send = MIN(s->buffer_size - offset, s->xfer_limit - s->bytes_xfer);
ret = migrate_fd_put_buffer(s, s->buffer + offset, to_send);
if (ret <= 0) {
DPRINTF("error flushing data, %zd\n", ret);
break;
} else {
DPRINTF("flushed %zd byte(s)\n", ret);
offset += ret;
s->bytes_xfer += ret;
}
}
DPRINTF("flushed %zu of %zu byte(s)\n", offset, s->buffer_size);
memmove(s->buffer, s->buffer + offset, s->buffer_size - offset);
s->buffer_size -= offset;
if (ret < 0) {
return ret;
}
return offset;
}
static int buffered_put_buffer(void *opaque, const uint8_t *buf,
int64_t pos, int size)
{
MigrationState *s = opaque;
ssize_t error;
DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos);
error = qemu_file_get_error(s->file);
if (error) {
DPRINTF("flush when error, bailing: %s\n", strerror(-error));
return error;
}
if (size <= 0) {
return size;
}
if (size > (s->buffer_capacity - s->buffer_size)) {
DPRINTF("increasing buffer capacity from %zu by %zu\n",
s->buffer_capacity, size + 1024);
s->buffer_capacity += size + 1024;
s->buffer = g_realloc(s->buffer, s->buffer_capacity);
}
memcpy(s->buffer + s->buffer_size, buf, size);
s->buffer_size += size;
return size;
}
static int buffered_close(void *opaque)
{
MigrationState *s = opaque;
ssize_t ret = 0;
int ret2;
DPRINTF("closing\n");
s->xfer_limit = INT_MAX;
while (!qemu_file_get_error(s->file) && s->buffer_size) {
ret = buffered_flush(s);
if (ret < 0) {
break;
}
}
ret2 = migrate_fd_close(s);
if (ret >= 0) {
ret = ret2;
}
s->complete = true;
return ret;
}
static int buffered_get_fd(void *opaque)
{
MigrationState *s = opaque;
return s->fd;
}
/*
* The meaning of the return values is:
* 0: We can continue sending
* 1: Time to stop
* negative: There has been an error
*/
static int buffered_rate_limit(void *opaque)
{
MigrationState *s = opaque;
int ret;
ret = qemu_file_get_error(s->file);
if (ret) {
return ret;
}
if (s->bytes_xfer >= s->xfer_limit) {
return 1;
}
return 0;
}
static int64_t buffered_set_rate_limit(void *opaque, int64_t new_rate)
{
MigrationState *s = opaque;
if (qemu_file_get_error(s->file)) {
goto out;
}
if (new_rate > SIZE_MAX) {
new_rate = SIZE_MAX;
}
s->xfer_limit = new_rate / XFER_LIMIT_RATIO;
out:
return s->xfer_limit;
}
static int64_t buffered_get_rate_limit(void *opaque)
{
MigrationState *s = opaque;
return s->xfer_limit;
}
static void *buffered_file_thread(void *opaque)
static void *migration_thread(void *opaque)
{
MigrationState *s = opaque;
int64_t initial_time = qemu_get_clock_ms(rt_clock);
int64_t sleep_time = 0;
int64_t initial_bytes = 0;
int64_t max_size = 0;
bool last_round = false;
int ret;
int64_t start_time = initial_time;
bool old_vm_running = false;
qemu_mutex_lock_iothread();
DPRINTF("beginning savevm\n");
ret = qemu_savevm_state_begin(s->file, &s->params);
if (ret < 0) {
DPRINTF("failed, %d\n", ret);
qemu_mutex_unlock_iothread();
goto out;
}
qemu_mutex_unlock_iothread();
qemu_savevm_state_begin(s->file, &s->params);
while (true) {
while (s->state == MIG_STATE_ACTIVE) {
int64_t current_time;
uint64_t pending_size;
qemu_mutex_lock_iothread();
if (s->state != MIG_STATE_ACTIVE) {
DPRINTF("put_ready returning because of non-active state\n");
qemu_mutex_unlock_iothread();
break;
}
if (s->complete) {
qemu_mutex_unlock_iothread();
break;
}
if (s->bytes_xfer < s->xfer_limit) {
if (!qemu_file_rate_limit(s->file)) {
DPRINTF("iterate\n");
pending_size = qemu_savevm_state_pending(s->file, max_size);
DPRINTF("pending size %lu max %lu\n", pending_size, max_size);
if (pending_size && pending_size >= max_size) {
ret = qemu_savevm_state_iterate(s->file);
if (ret < 0) {
qemu_mutex_unlock_iothread();
break;
}
qemu_savevm_state_iterate(s->file);
} else {
int old_vm_running = runstate_is_running();
int64_t start_time, end_time;
DPRINTF("done iterating\n");
qemu_mutex_lock_iothread();
start_time = qemu_get_clock_ms(rt_clock);
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
if (old_vm_running) {
vm_stop(RUN_STATE_FINISH_MIGRATE);
} else {
vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
}
ret = qemu_savevm_state_complete(s->file);
if (ret < 0) {
qemu_mutex_unlock_iothread();
old_vm_running = runstate_is_running();
vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
qemu_file_set_rate_limit(s->file, INT_MAX);
qemu_savevm_state_complete(s->file);
qemu_mutex_unlock_iothread();
if (!qemu_file_get_error(s->file)) {
migrate_finish_set_state(s, MIG_STATE_COMPLETED);
break;
} else {
migrate_fd_completed(s);
}
end_time = qemu_get_clock_ms(rt_clock);
s->total_time = end_time - s->total_time;
s->downtime = end_time - start_time;
if (s->state != MIG_STATE_COMPLETED) {
if (old_vm_running) {
vm_start();
}
}
last_round = true;
}
}
qemu_mutex_unlock_iothread();
if (qemu_file_get_error(s->file)) {
migrate_finish_set_state(s, MIG_STATE_ERROR);
break;
}
current_time = qemu_get_clock_ms(rt_clock);
if (current_time >= initial_time + BUFFER_DELAY) {
uint64_t transferred_bytes = s->bytes_xfer;
uint64_t transferred_bytes = qemu_ftell(s->file) - initial_bytes;
uint64_t time_spent = current_time - initial_time - sleep_time;
double bandwidth = transferred_bytes / time_spent;
max_size = bandwidth * migrate_max_downtime() / 1000000;
@ -744,54 +553,48 @@ static void *buffered_file_thread(void *opaque)
s->expected_downtime = s->dirty_bytes_rate / bandwidth;
}
s->bytes_xfer = 0;
qemu_file_reset_rate_limit(s->file);
sleep_time = 0;
initial_time = current_time;
initial_bytes = qemu_ftell(s->file);
}
if (!last_round && (s->bytes_xfer >= s->xfer_limit)) {
if (qemu_file_rate_limit(s->file)) {
/* usleep expects microseconds */
g_usleep((initial_time + BUFFER_DELAY - current_time)*1000);
sleep_time += qemu_get_clock_ms(rt_clock) - current_time;
}
ret = buffered_flush(s);
if (ret < 0) {
break;
}
qemu_mutex_lock_iothread();
if (s->state == MIG_STATE_COMPLETED) {
int64_t end_time = qemu_get_clock_ms(rt_clock);
s->total_time = end_time - s->total_time;
s->downtime = end_time - start_time;
runstate_set(RUN_STATE_POSTMIGRATE);
} else {
if (old_vm_running) {
vm_start();
}
}
qemu_bh_schedule(s->cleanup_bh);
qemu_mutex_unlock_iothread();
out:
if (ret < 0) {
migrate_fd_error(s);
}
g_free(s->buffer);
return NULL;
}
static const QEMUFileOps buffered_file_ops = {
.get_fd = buffered_get_fd,
.put_buffer = buffered_put_buffer,
.close = buffered_close,
.rate_limit = buffered_rate_limit,
.get_rate_limit = buffered_get_rate_limit,
.set_rate_limit = buffered_set_rate_limit,
};
void migrate_fd_connect(MigrationState *s)
{
s->state = MIG_STATE_ACTIVE;
s->bytes_xfer = 0;
s->buffer = NULL;
s->buffer_size = 0;
s->buffer_capacity = 0;
trace_migrate_set_state(MIG_STATE_ACTIVE);
/* This is a best 1st approximation. ns to ms */
s->expected_downtime = max_downtime/1000000;
s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s);
s->xfer_limit = s->bandwidth_limit / XFER_LIMIT_RATIO;
s->complete = false;
qemu_file_set_rate_limit(s->file,
s->bandwidth_limit / XFER_LIMIT_RATIO);
s->file = qemu_fopen_ops(s, &buffered_file_ops);
qemu_thread_create(&s->thread, buffered_file_thread, s,
QEMU_THREAD_DETACHED);
qemu_thread_create(&s->thread, migration_thread, s,
QEMU_THREAD_JOINABLE);
notifier_list_notify(&migration_state_notifiers, s);
}

25
page_cache.c
View File

@ -152,11 +152,14 @@ void cache_insert(PageCache *cache, uint64_t addr, uint8_t *pdata)
/* actual update of entry */
it = cache_get_by_addr(cache, addr);
/* free old cached data if any */
g_free(it->it_data);
if (!it->it_data) {
cache->num_items++;
}
it->it_data = pdata;
it->it_data = g_memdup(pdata, cache->page_size);
it->it_age = ++cache->max_item_age;
it->it_addr = addr;
}
@ -192,22 +195,22 @@ int64_t cache_resize(PageCache *cache, int64_t new_num_pages)
if (old_it->it_addr != -1) {
/* check for collision, if there is, keep MRU page */
new_it = cache_get_by_addr(new_cache, old_it->it_addr);
if (new_it->it_data) {
if (new_it->it_data && new_it->it_age >= old_it->it_age) {
/* keep the MRU page */
if (new_it->it_age >= old_it->it_age) {
g_free(old_it->it_data);
} else {
g_free(new_it->it_data);
new_it->it_data = old_it->it_data;
new_it->it_age = old_it->it_age;
new_it->it_addr = old_it->it_addr;
}
g_free(old_it->it_data);
} else {
cache_insert(new_cache, old_it->it_addr, old_it->it_data);
if (!new_it->it_data) {
new_cache->num_items++;
}
g_free(new_it->it_data);
new_it->it_data = old_it->it_data;
new_it->it_age = old_it->it_age;
new_it->it_addr = old_it->it_addr;
}
}
}
g_free(cache->page_cache);
cache->page_cache = new_cache->page_cache;
cache->max_num_items = new_cache->max_num_items;
cache->num_items = new_cache->num_items;

214
savevm.c
View File

@ -119,8 +119,11 @@ struct QEMUFile {
void *opaque;
int is_write;
int64_t buf_offset; /* start of buffer when writing, end of buffer
when reading */
int64_t bytes_xfer;
int64_t xfer_limit;
int64_t pos; /* start of buffer when writing, end of buffer
when reading */
int buf_index;
int buf_size; /* 0 when writing */
uint8_t buf[IO_BUF_SIZE];
@ -198,6 +201,18 @@ static int socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
return len;
}
static int socket_put_buffer(void *opaque, const uint8_t *buf, int64_t pos, int size)
{
QEMUFileSocket *s = opaque;
ssize_t len;
len = qemu_send_full(s->fd, buf, size, 0);
if (len < size) {
len = -socket_error();
}
return len;
}
static int socket_close(void *opaque)
{
QEMUFileSocket *s = opaque;
@ -247,6 +262,9 @@ static int stdio_pclose(void *opaque)
ret = pclose(s->stdio_file);
if (ret == -1) {
ret = -errno;
} else if (!WIFEXITED(ret) || WEXITSTATUS(ret) != 0) {
/* close succeeded, but non-zero exit code: */
ret = -EIO; /* fake errno value */
}
g_free(s);
return ret;
@ -256,6 +274,24 @@ static int stdio_fclose(void *opaque)
{
QEMUFileStdio *s = opaque;
int ret = 0;
if (s->file->ops->put_buffer) {
int fd = fileno(s->stdio_file);
struct stat st;
ret = fstat(fd, &st);
if (ret == 0 && S_ISREG(st.st_mode)) {
/*
* If the file handle is a regular file make sure the
* data is flushed to disk before signaling success.
*/
ret = fsync(fd);
if (ret != 0) {
ret = -errno;
return ret;
}
}
}
if (fclose(s->stdio_file) == EOF) {
ret = -errno;
}
@ -275,11 +311,17 @@ static const QEMUFileOps stdio_pipe_write_ops = {
.close = stdio_pclose
};
QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
{
FILE *stdio_file;
QEMUFileStdio *s;
if (stdio_file == NULL || mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
stdio_file = popen(command, mode);
if (stdio_file == NULL) {
return NULL;
}
if (mode == NULL || (mode[0] != 'r' && mode[0] != 'w') || mode[1] != 0) {
fprintf(stderr, "qemu_popen: Argument validity check failed\n");
return NULL;
}
@ -296,18 +338,6 @@ QEMUFile *qemu_popen(FILE *stdio_file, const char *mode)
return s->file;
}
QEMUFile *qemu_popen_cmd(const char *command, const char *mode)
{
FILE *popen_file;
popen_file = popen(command, mode);
if(popen_file == NULL) {
return NULL;
}
return qemu_popen(popen_file, mode);
}
static const QEMUFileOps stdio_file_read_ops = {
.get_fd = stdio_get_fd,
.get_buffer = stdio_get_buffer,
@ -354,12 +384,30 @@ static const QEMUFileOps socket_read_ops = {
.close = socket_close
};
QEMUFile *qemu_fopen_socket(int fd)
static const QEMUFileOps socket_write_ops = {
.get_fd = socket_get_fd,
.put_buffer = socket_put_buffer,
.close = socket_close
};
QEMUFile *qemu_fopen_socket(int fd, const char *mode)
{
QEMUFileSocket *s = g_malloc0(sizeof(QEMUFileSocket));
if (mode == NULL ||
(mode[0] != 'r' && mode[0] != 'w') ||
mode[1] != 'b' || mode[2] != 0) {
fprintf(stderr, "qemu_fopen: Argument validity check failed\n");
return NULL;
}
s->fd = fd;
s->file = qemu_fopen_ops(s, &socket_read_ops);
if (mode[0] == 'w') {
socket_set_block(s->fd);
s->file = qemu_fopen_ops(s, &socket_write_ops);
} else {
s->file = qemu_fopen_ops(s, &socket_read_ops);
}
return s->file;
}
@ -434,7 +482,6 @@ QEMUFile *qemu_fopen_ops(void *opaque, const QEMUFileOps *ops)
f->opaque = opaque;
f->ops = ops;
f->is_write = 0;
return f;
}
@ -453,21 +500,23 @@ static void qemu_file_set_error(QEMUFile *f, int ret)
/** Flushes QEMUFile buffer
*
*/
static int qemu_fflush(QEMUFile *f)
static void qemu_fflush(QEMUFile *f)
{
int ret = 0;
if (!f->ops->put_buffer)
return 0;
if (!f->ops->put_buffer) {
return;
}
if (f->is_write && f->buf_index > 0) {
ret = f->ops->put_buffer(f->opaque, f->buf, f->buf_offset, f->buf_index);
ret = f->ops->put_buffer(f->opaque, f->buf, f->pos, f->buf_index);
if (ret >= 0) {
f->buf_offset += f->buf_index;
f->pos += f->buf_index;
}
f->buf_index = 0;
}
return ret;
if (ret < 0) {
qemu_file_set_error(f, ret);
}
}
static void qemu_fill_buffer(QEMUFile *f)
@ -488,11 +537,11 @@ static void qemu_fill_buffer(QEMUFile *f)
f->buf_index = 0;
f->buf_size = pending;
len = f->ops->get_buffer(f->opaque, f->buf + pending, f->buf_offset,
len = f->ops->get_buffer(f->opaque, f->buf + pending, f->pos,
IO_BUF_SIZE - pending);
if (len > 0) {
f->buf_size += len;
f->buf_offset += len;
f->pos += len;
} else if (len == 0) {
qemu_file_set_error(f, -EIO);
} else if (len != -EAGAIN)
@ -518,7 +567,8 @@ int qemu_get_fd(QEMUFile *f)
int qemu_fclose(QEMUFile *f)
{
int ret;
ret = qemu_fflush(f);
qemu_fflush(f);
ret = qemu_file_get_error(f);
if (f->ops->close) {
int ret2 = f->ops->close(f->opaque);
@ -557,12 +607,12 @@ void qemu_put_buffer(QEMUFile *f, const uint8_t *buf, int size)
memcpy(f->buf + f->buf_index, buf, l);
f->is_write = 1;
f->buf_index += l;
f->bytes_xfer += l;
buf += l;
size -= l;
if (f->buf_index >= IO_BUF_SIZE) {
int ret = qemu_fflush(f);
if (ret < 0) {
qemu_file_set_error(f, ret);
qemu_fflush(f);
if (qemu_file_get_error(f)) {
break;
}
}
@ -584,10 +634,7 @@ void qemu_put_byte(QEMUFile *f, int v)
f->buf[f->buf_index++] = v;
f->is_write = 1;
if (f->buf_index >= IO_BUF_SIZE) {
int ret = qemu_fflush(f);
if (ret < 0) {
qemu_file_set_error(f, ret);
}
qemu_fflush(f);
}
}
@ -675,38 +722,34 @@ int qemu_get_byte(QEMUFile *f)
int64_t qemu_ftell(QEMUFile *f)
{
/* buf_offset excludes buffer for writing but includes it for reading */
if (f->is_write) {
return f->buf_offset + f->buf_index;
} else {
return f->buf_offset - f->buf_size + f->buf_index;
}
qemu_fflush(f);
return f->pos;
}
int qemu_file_rate_limit(QEMUFile *f)
{
if (f->ops->rate_limit)
return f->ops->rate_limit(f->opaque);
if (qemu_file_get_error(f)) {
return 1;
}
if (f->xfer_limit > 0 && f->bytes_xfer > f->xfer_limit) {
return 1;
}
return 0;
}
int64_t qemu_file_get_rate_limit(QEMUFile *f)
{
if (f->ops->get_rate_limit)
return f->ops->get_rate_limit(f->opaque);
return 0;
return f->xfer_limit;
}
int64_t qemu_file_set_rate_limit(QEMUFile *f, int64_t new_rate)
void qemu_file_set_rate_limit(QEMUFile *f, int64_t limit)
{
/* any failed or completed migration keeps its state to allow probing of
* migration data, but has no associated file anymore */
if (f && f->ops->set_rate_limit)
return f->ops->set_rate_limit(f->opaque, new_rate);
f->xfer_limit = limit;
}
return 0;
void qemu_file_reset_rate_limit(QEMUFile *f)
{
f->bytes_xfer = 0;
}
void qemu_put_be16(QEMUFile *f, unsigned int v)
@ -1580,8 +1623,8 @@ bool qemu_savevm_state_blocked(Error **errp)
return false;
}
int qemu_savevm_state_begin(QEMUFile *f,
const MigrationParams *params)
void qemu_savevm_state_begin(QEMUFile *f,
const MigrationParams *params)
{
SaveStateEntry *se;
int ret;
@ -1621,17 +1664,10 @@ int qemu_savevm_state_begin(QEMUFile *f,
ret = se->ops->save_live_setup(f, se->opaque);
if (ret < 0) {
qemu_savevm_state_cancel();
return ret;
qemu_file_set_error(f, ret);
break;
}
}
ret = qemu_file_get_error(f);
if (ret != 0) {
qemu_savevm_state_cancel();
}
return ret;
}
/*
@ -1665,6 +1701,9 @@ int qemu_savevm_state_iterate(QEMUFile *f)
ret = se->ops->save_live_iterate(f, se->opaque);
trace_savevm_section_end(se->section_id);
if (ret < 0) {
qemu_file_set_error(f, ret);
}
if (ret <= 0) {
/* Do not proceed to the next vmstate before this one reported
completion of the current stage. This serializes the migration
@ -1673,17 +1712,10 @@ int qemu_savevm_state_iterate(QEMUFile *f)
break;
}
}
if (ret != 0) {
return ret;
}
ret = qemu_file_get_error(f);
if (ret != 0) {
qemu_savevm_state_cancel();
}
return ret;
}
int qemu_savevm_state_complete(QEMUFile *f)
void qemu_savevm_state_complete(QEMUFile *f)
{
SaveStateEntry *se;
int ret;
@ -1707,7 +1739,8 @@ int qemu_savevm_state_complete(QEMUFile *f)
ret = se->ops->save_live_complete(f, se->opaque);
trace_savevm_section_end(se->section_id);
if (ret < 0) {
return ret;
qemu_file_set_error(f, ret);
return;
}
}
@ -1735,8 +1768,7 @@ int qemu_savevm_state_complete(QEMUFile *f)
}
qemu_put_byte(f, QEMU_VM_EOF);
return qemu_file_get_error(f);
qemu_fflush(f);
}
uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size)
@ -1778,27 +1810,27 @@ static int qemu_savevm_state(QEMUFile *f)
};
if (qemu_savevm_state_blocked(NULL)) {
ret = -EINVAL;
goto out;
return -EINVAL;
}
ret = qemu_savevm_state_begin(f, &params);
if (ret < 0)
goto out;
qemu_mutex_unlock_iothread();
qemu_savevm_state_begin(f, &params);
qemu_mutex_lock_iothread();
do {
ret = qemu_savevm_state_iterate(f);
if (ret < 0)
goto out;
} while (ret == 0);
while (qemu_file_get_error(f) == 0) {
if (qemu_savevm_state_iterate(f) > 0) {
break;
}
}
ret = qemu_savevm_state_complete(f);
out:
ret = qemu_file_get_error(f);
if (ret == 0) {
qemu_savevm_state_complete(f);
ret = qemu_file_get_error(f);
}
if (ret != 0) {
qemu_savevm_state_cancel();
}
return ret;
}

3
trace-events
View File

@ -1091,3 +1091,6 @@ css_io_interrupt(int cssid, int ssid, int schid, uint32_t intparm, uint8_t isc,
# hw/s390x/virtio-ccw.c
virtio_ccw_interpret_ccw(int cssid, int ssid, int schid, int cmd_code) "VIRTIO-CCW: %x.%x.%04x: interpret command %x"
virtio_ccw_new_device(int cssid, int ssid, int schid, int devno, const char *devno_mode) "VIRTIO-CCW: add subchannel %x.%x.%04x, devno %04x (%s)"
# migration.c
migrate_set_state(int new_state) "new state %d"