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migration: Accept 'cont' only after successful incoming migration

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When a 'cont' is issued on a VM that's just waiting for an incoming
migration, the VM reboots and boots into the guest, possibly corrupting
its storage since it could be shared with another VM running elsewhere.

Ensure that a VM started with '-incoming' is only run when an incoming
migration successfully completes.

A new qerror, QERR_MIGRATION_EXPECTED, is added to signal that 'cont'
failed due to no incoming migration has been attempted yet.

Reported-by: Laine Stump <laine@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Amit Shah 2010-07-27 15:49:19 +05:30 • committed by Aurelien Jarno
parent 7899f799b7
commit 8e84865e54
6 changed files with 16 additions and 0 deletions
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2
migration.c
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@ -67,6 +67,8 @@ void process_incoming_migration(QEMUFile *f)
qemu_announce_self();
DPRINTF("successfully loaded vm state\n");
incoming_expected = false;
if (autostart)
vm_start();
}