Re: [libvirt] [PATCH] qemu: Ignore graphics cookie if port == 0

Old libvirt represents <graphics type='spice'> <listen type='none'/> </graphics> as <graphics type='spice' autoport='no'/> In this mode, QEMU doesn't listen for SPICE connection anywhere and clients have to use virDomainOpenGraphics* APIs to attach to the domain. That is, the client has to run on the same host where the domains runs and it's impossible to tell the client to reconnect to the destination QEMU during migration (unless there is some kind of proxy on the host). While current libvirt correctly ignores such graphics devices when creating graphics migration cookie, old libvirt just sends <graphics type='spice' port='0' listen='0.0.0.0' tlsPort='-1'/> in the cookie. After seeing this cookie, we happily would call client_migrate_info QMP command and wait for SPICE_MIGRATE_COMPLETED event, which is quite pointless since the doesn't know where to connecti anyway. We should just ignore such cookies. https://bugzilla.redhat.com/show_bug.cgi?id=1376083 Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com&gt; --- src/qemu/qemu_migration.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c index e734816..8a220d9 100644 --- a/src/qemu/qemu_migration.c +++ b/src/qemu/qemu_migration.c @@ -2903,6 +2903,15 @@ qemuDomainMigrateGraphicsRelocate(virQEMUDriverPtr driver, goto cleanup; } + /* Older libvirt sends port == 0 for listen type='none' graphics. It's + * safe to ignore such requests since relocation to unknown port does + * not make sense in general. + */ + if (port <= 0 && tlsPort <= 0) { + ret = 0; + goto cleanup; + } + if (qemuDomainObjEnterMonitorAsync(driver, vm, QEMU_ASYNC_JOB_MIGRATION_OUT) == 0) { ret = qemuMonitorGraphicsRelocate(priv->mon, type, listenAddress,