From patchwork Fri Mar 19 11:58:38 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [1/9] virtio-serial-bus: save/load: Ensure target has enough ports Date: Fri, 19 Mar 2010 01:58:38 -0000 From: Amit Shah X-Patchwork-Id: 48140 Message-Id: <1268999926-29560-2-git-send-email-amit.shah@redhat.com> To: qemu-devel@nongnu.org Cc: Amit Shah , quintela@redhat.com, mst@redhat.com, kraxel@redhat.com, virtualization@lists.linux-foundation.org The target could be started with max_nr_ports for a virtio-serial device lesser than what was available on the source machine. Fail the migration in such a case. Signed-off-by: Amit Shah Reported-by: Juan Quintela --- hw/virtio-serial-bus.c | 10 +++++++++- 1 files changed, 9 insertions(+), 1 deletions(-) diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c index 17c1ec1..36985a1 100644 --- a/hw/virtio-serial-bus.c +++ b/hw/virtio-serial-bus.c @@ -374,6 +374,8 @@ static void virtio_serial_save(QEMUFile *f, void *opaque) /* Items in struct VirtIOSerial */ + qemu_put_be32s(f, &s->bus->max_nr_ports); + /* Do this because we might have hot-unplugged some ports */ nr_active_ports = 0; QTAILQ_FOREACH(port, &s->ports, next) @@ -399,7 +401,7 @@ static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id) { VirtIOSerial *s = opaque; VirtIOSerialPort *port; - uint32_t nr_active_ports; + uint32_t max_nr_ports, nr_active_ports; unsigned int i; if (version_id > 2) { @@ -420,6 +422,12 @@ static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id) /* Items in struct VirtIOSerial */ + qemu_get_be32s(f, &max_nr_ports); + if (max_nr_ports > s->bus->max_nr_ports) { + /* Source could have more ports than us. Fail migration. */ + return -EINVAL; + } + qemu_get_be32s(f, &nr_active_ports); /* Items in struct VirtIOSerialPort */