From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1O1vBH-00028c-Ae for qemu-devel@nongnu.org; Wed, 14 Apr 2010 01:30:31 -0400 Received: from [140.186.70.92] (port=47169 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1O1vBE-00027I-3J for qemu-devel@nongnu.org; Wed, 14 Apr 2010 01:30:30 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1O1vBC-0005w1-Bf for qemu-devel@nongnu.org; Wed, 14 Apr 2010 01:30:27 -0400 Received: from mx1.redhat.com ([209.132.183.28]:64451) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1O1vBC-0005vi-4J for qemu-devel@nongnu.org; Wed, 14 Apr 2010 01:30:26 -0400 From: Amit Shah Date: Wed, 14 Apr 2010 10:58:21 +0530 Message-Id: <1271222917-7803-2-git-send-email-amit.shah@redhat.com> In-Reply-To: <1271222917-7803-1-git-send-email-amit.shah@redhat.com> References: <1271222917-7803-1-git-send-email-amit.shah@redhat.com> Subject: [Qemu-devel] [PATCH v5 01/17] virtio-serial: save/load: Ensure target has enough ports List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Anthony Liguori Cc: qemu list , Amit Shah , Gerd Hoffmann , Juan Quintela 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 | 13 +++++++++++-- 1 files changed, 11 insertions(+), 2 deletions(-) diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c index 17c1ec1..9a7f0c1 100644 --- a/hw/virtio-serial-bus.c +++ b/hw/virtio-serial-bus.c @@ -374,10 +374,13 @@ 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) + QTAILQ_FOREACH(port, &s->ports, next) { nr_active_ports++; + } qemu_put_be32s(f, &nr_active_ports); @@ -399,7 +402,7 @@ 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 +423,12 @@ 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 */ -- 1.6.2.5