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migration/next for 20151015 

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Merge remote-tracking branch 'remotes/juanquintela/tags/migration/20151015' into staging

migration/next for 20151015

# gpg: Signature made Thu 15 Oct 2015 07:25:27 BST using RSA key ID 5872D723
# gpg: Good signature from "Juan Quintela <quintela@redhat.com>"
# gpg:                 aka "Juan Quintela <quintela@trasno.org>"

* remotes/juanquintela/tags/migration/20151015:
  migration: fix deadlock
  migration: announce VM's new home just before VM is runnable
  Migration: Generate the completed event only when we complete

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2015-10-16 15:47:59 +01:00
parent c49d3411fa 60be634079
commit e95bdb4341
2 changed files with 40 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
migration/migration.c
View File

@ -294,17 +294,22 @@ static void process_incoming_migration_co(void *opaque)
migrate_decompress_threads_join();
exit(EXIT_FAILURE);
}
migrate_generate_event(MIGRATION_STATUS_COMPLETED);
qemu_announce_self();
/* Make sure all file formats flush their mutable metadata */
bdrv_invalidate_cache_all(&local_err);
if (local_err) {
migrate_generate_event(MIGRATION_STATUS_FAILED);
error_report_err(local_err);
migrate_decompress_threads_join();
exit(EXIT_FAILURE);
}
/*
* This must happen after all error conditions are dealt with and
* we're sure the VM is going to be running on this host.
*/
qemu_announce_self();
/* If global state section was not received or we are in running
state, we need to obey autostart. Any other state is set with
runstate_set. */
@ -320,6 +325,12 @@ static void process_incoming_migration_co(void *opaque)
runstate_set(global_state_get_runstate());
}
migrate_decompress_threads_join();
/*
* This must happen after any state changes since as soon as an external
* observer sees this event they might start to prod at the VM assuming
* it's ready to use.
*/
migrate_generate_event(MIGRATION_STATUS_COMPLETED);
}
void process_incoming_migration(QEMUFile *f)

44
migration/ram.c
View File

@ -219,7 +219,6 @@ static RAMBlock *last_seen_block;
/* This is the last block from where we have sent data */
static RAMBlock *last_sent_block;
static ram_addr_t last_offset;
static unsigned long *migration_bitmap;
static QemuMutex migration_bitmap_mutex;
static uint64_t migration_dirty_pages;
static uint32_t last_version;
@ -236,6 +235,11 @@ struct PageSearchStatus {
};
typedef struct PageSearchStatus PageSearchStatus;
static struct BitmapRcu {
struct rcu_head rcu;
unsigned long *bmap;
} *migration_bitmap_rcu;
struct CompressParam {
bool start;
bool done;
@ -540,7 +544,7 @@ ram_addr_t migration_bitmap_find_and_reset_dirty(RAMBlock *rb,
unsigned long next;
bitmap = atomic_rcu_read(&migration_bitmap);
bitmap = atomic_rcu_read(&migration_bitmap_rcu)->bmap;
if (ram_bulk_stage && nr > base) {
next = nr + 1;
} else {
@ -558,7 +562,7 @@ ram_addr_t migration_bitmap_find_and_reset_dirty(RAMBlock *rb,
static void migration_bitmap_sync_range(ram_addr_t start, ram_addr_t length)
{
unsigned long *bitmap;
bitmap = atomic_rcu_read(&migration_bitmap);
bitmap = atomic_rcu_read(&migration_bitmap_rcu)->bmap;
migration_dirty_pages +=
cpu_physical_memory_sync_dirty_bitmap(bitmap, start, length);
}
@ -1090,17 +1094,22 @@ void free_xbzrle_decoded_buf(void)
xbzrle_decoded_buf = NULL;
}
static void migration_bitmap_free(struct BitmapRcu *bmap)
{
g_free(bmap->bmap);
g_free(bmap);
}
static void migration_end(void)
{
/* caller have hold iothread lock or is in a bh, so there is
* no writing race against this migration_bitmap
*/
unsigned long *bitmap = migration_bitmap;
atomic_rcu_set(&migration_bitmap, NULL);
struct BitmapRcu *bitmap = migration_bitmap_rcu;
atomic_rcu_set(&migration_bitmap_rcu, NULL);
if (bitmap) {
memory_global_dirty_log_stop();
synchronize_rcu();
g_free(bitmap);
call_rcu(bitmap, migration_bitmap_free, rcu);
}
XBZRLE_cache_lock();
@ -1136,9 +1145,10 @@ void migration_bitmap_extend(ram_addr_t old, ram_addr_t new)
/* called in qemu main thread, so there is
* no writing race against this migration_bitmap
*/
if (migration_bitmap) {
unsigned long *old_bitmap = migration_bitmap, *bitmap;
bitmap = bitmap_new(new);
if (migration_bitmap_rcu) {
struct BitmapRcu *old_bitmap = migration_bitmap_rcu, *bitmap;
bitmap = g_new(struct BitmapRcu, 1);
bitmap->bmap = bitmap_new(new);
/* prevent migration_bitmap content from being set bit
* by migration_bitmap_sync_range() at the same time.
@ -1146,13 +1156,12 @@ void migration_bitmap_extend(ram_addr_t old, ram_addr_t new)
* at the same time.
*/
qemu_mutex_lock(&migration_bitmap_mutex);
bitmap_copy(bitmap, old_bitmap, old);
bitmap_set(bitmap, old, new - old);
atomic_rcu_set(&migration_bitmap, bitmap);
bitmap_copy(bitmap->bmap, old_bitmap->bmap, old);
bitmap_set(bitmap->bmap, old, new - old);
atomic_rcu_set(&migration_bitmap_rcu, bitmap);
qemu_mutex_unlock(&migration_bitmap_mutex);
migration_dirty_pages += new - old;
synchronize_rcu();
g_free(old_bitmap);
call_rcu(old_bitmap, migration_bitmap_free, rcu);
}
}
@ -1210,8 +1219,9 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
reset_ram_globals();
ram_bitmap_pages = last_ram_offset() >> TARGET_PAGE_BITS;
migration_bitmap = bitmap_new(ram_bitmap_pages);
bitmap_set(migration_bitmap, 0, ram_bitmap_pages);
migration_bitmap_rcu = g_new(struct BitmapRcu, 1);
migration_bitmap_rcu->bmap = bitmap_new(ram_bitmap_pages);
bitmap_set(migration_bitmap_rcu->bmap, 0, ram_bitmap_pages);
/*
* Count the total number of pages used by ram blocks not including any