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migration/colo.c: Flush ram cache only after receiving device state

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If we suceed in receiving ram state, but fail receiving the device
state, there will be a mismatch between the two.

Fix this by flushing the ram cache only after the vmstate has been
received.

Signed-off-by: Lukas Straub <lukasstraub2@web.de>
Message-Id: <3289d007d494cb0e2f05b1cf4ae6a78d300fede3.1589193382.git.lukasstraub2@web.de>
Reviewed-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Lukas Straub 2020-05-11 13:10:51 +02:00 committed by Dr. David Alan Gilbert
parent 786d8b8e38
commit 24fa16f8cc
3 changed files with 3 additions and 4 deletions
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1
migration/colo.c
View file

@ -748,6 +748,7 @@ static void colo_incoming_process_checkpoint(MigrationIncomingState *mis,
qemu_mutex_lock_iothread();
vmstate_loading = true;
colo_flush_ram_cache();
ret = qemu_load_device_state(fb);
if (ret < 0) {
error_setg(errp, "COLO: load device state failed");

5
migration/ram.c
View file

@ -3360,7 +3360,7 @@ static bool postcopy_is_running(void)
* Flush content of RAM cache into SVM's memory.
* Only flush the pages that be dirtied by PVM or SVM or both.
*/
static void colo_flush_ram_cache(void)
void colo_flush_ram_cache(void)
{
RAMBlock *block = NULL;
void *dst_host;
@ -3632,9 +3632,6 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
}
trace_ram_load_complete(ret, seq_iter);
if (!ret && migration_incoming_in_colo_state()) {
colo_flush_ram_cache();
}
return ret;
}

1
migration/ram.h
View file

@ -65,6 +65,7 @@ int ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *rb);
/* ram cache */
int colo_init_ram_cache(void);
void colo_flush_ram_cache(void);
void colo_release_ram_cache(void);
void colo_incoming_start_dirty_log(void);