Linux Virtualization - May 2010 - [PATCH 0/3] virtio: console: Handle multiple console port resizes

Hello,

This series adds resize support for multiple console ports. The size
for each console is stored in its structure and the host informs the
guest about size changes via the VIRTIO_CONSOLE_RESIZE control
message.

This is easily tested by the qemu patches provided by Kusanagi Kouichi
with some updates, which I will shortly send to the qemu-devel list.

Please apply,

	Amit.

Amit Shah (3):
  virtio: console: Resize console port 0 on config intr only if
    multiport is off
  virtio: console: Store each console's size in the console structure
  virtio: console: Accept console size along with resize control
    message

 drivers/char/virtio_console.c |   71 ++++++++++++++++++++++++++++++-----------
 1 files changed, 52 insertions(+), 19 deletions(-)

When using multiport, we'll use control messages. Ensure we don't
accidentally update port 0 size on config interrupts.

Signed-off-by: Amit Shah <amit.shah at redhat.com>
CC: Christian Borntraeger <borntraeger at de.ibm.com>
CC: linuxppc-dev at ozlabs.org
CC: Kusanagi Kouichi <slash at ac.auone-net.jp>
---
 drivers/char/virtio_console.c |   17 ++++++++++-------
 1 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index a64558f..e2d05ea 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1319,13 +1319,16 @@ static void config_intr(struct virtio_device *vdev)
 
 	portdev = vdev->priv;
 
-	/*
-	 * We'll use this way of resizing only for legacy support.
-	 * For newer userspace (VIRTIO_CONSOLE_F_MULTPORT+), use
-	 * control messages to indicate console size changes so that
-	 * it can be done per-port
-	 */
-	resize_console(find_port_by_id(portdev, 0));
+	if (!use_multiport(portdev)) {
+		/*
+		 * We'll use this way of resizing only for legacy
+		 * support.  For newer userspace
+		 * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages
+		 * to indicate console size changes so that it can be
+		 * done per-port.
+		 */
+		resize_console(find_port_by_id(portdev, 0));
+	}
 }
 
 static int init_vqs(struct ports_device *portdev)
-- 
1.6.2.5

On Thu, 6 May 2010 06:05:06 am Amit Shah wrote:
> Hello,
> 
> This series adds resize support for multiple console ports. The size
> for each console is stored in its structure and the host informs the
> guest about size changes via the VIRTIO_CONSOLE_RESIZE control
> message.
Thanks, applied!

Rusty.