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migration: Fix a potential issue 

At the end of live migration and before vm_start() on the destination
side, we should make sure all the decompression tasks are finished, if
this can not be guaranteed, the VM may get the incorrect memory data,
or the updated memory may be overwritten by the decompression thread.
Add the code to fix this potential issue.

Suggested-by: David Alan Gilbert <dgilbert@redhat.com>
Suggested-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Liang Li <liang.z.li@intel.com>
Message-Id: <1462433579-13691-3-git-send-email-liang.z.li@intel.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Liang Li 2016-05-05 15:32:52 +08:00 committed by Amit Shah
parent 73a8912b8a
commit 5533b2e9bc
1 changed files with 19 additions and 0 deletions
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19
migration/ram.c
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@ -2223,6 +2223,24 @@ static void *do_data_decompress(void *opaque)
return NULL;
}
static void wait_for_decompress_done(void)
{
int idx, thread_count;
if (!migrate_use_compression()) {
return;
}
thread_count = migrate_decompress_threads();
qemu_mutex_lock(&decomp_done_lock);
for (idx = 0; idx < thread_count; idx++) {
while (!decomp_param[idx].done) {
qemu_cond_wait(&decomp_done_cond, &decomp_done_lock);
}
}
qemu_mutex_unlock(&decomp_done_lock);
}
void migrate_decompress_threads_create(void)
{
int i, thread_count;
@ -2557,6 +2575,7 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id)
}
}
wait_for_decompress_done();
rcu_read_unlock();
DPRINTF("Completed load of VM with exit code %d seq iteration "
"%" PRIu64 "\n", ret, seq_iter);