diff options
| -rw-r--r-- | migration/migration.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/migration/migration.c b/migration/migration.c index db6bde7453..bfc4d09aae 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -1629,6 +1629,25 @@ static bool migrate_prepare(MigrationState *s, bool blk, bool blk_inc, "paused migration"); return false; } + + /* + * Postcopy recovery won't work well with release-ram + * capability since release-ram will drop the page buffer as + * long as the page is put into the send buffer. So if there + * is a network failure happened, any page buffers that have + * not yet reached the destination VM but have already been + * sent from the source VM will be lost forever. Let's refuse + * the client from resuming such a postcopy migration. + * Luckily release-ram was designed to only be used when src + * and destination VMs are on the same host, so it should be + * fine. + */ + if (migrate_release_ram()) { + error_setg(errp, "Postcopy recovery cannot work " + "when release-ram capability is set"); + return false; + } + /* This is a resume, skip init status */ return true; } |