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[Qemu-devel] [PATCH for-2.3] virtio-serial: fix virtio config size

From: Michael S. Tsirkin
Subject: [Qemu-devel] [PATCH for-2.3] virtio-serial: fix virtio config size
Date: Wed, 25 Mar 2015 12:41:26 +0100

commit 9b70c1790acacae54d559d38ca69186a85040bb8
    virtio-serial: switch to standard-headers

changes virtio_console_config size from 8 to 12 bytes:
it adds an optional 4 byte emerg_wr field.

As this crosses a power of two boundary, this changes the PCI BAR size,
which breaks migration compatibility with old qemu machine types.
It's probably a problem for other transports as well.

As a temporary fix, as we don't yet support this new field anyway,
simply make the config size smaller at init time.

Long terms we probably want something along the lines
of virtio_net_set_config_size.

Reported-by: Cole Robinson <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>

Cole, could you pls confirm the following fixes the
issue that you reported?


 hw/char/virtio-serial-bus.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c
index 9a029d2..d05473f 100644
--- a/hw/char/virtio-serial-bus.c
+++ b/hw/char/virtio-serial-bus.c
@@ -949,8 +949,10 @@ static void virtio_serial_device_realize(DeviceState *dev, 
Error **errp)
+    /* We don't support emergency write, skip it for now. */
+    /* TODO: cleaner fix, depending on host features. */
     virtio_init(vdev, "virtio-serial", VIRTIO_ID_CONSOLE,
-                sizeof(struct virtio_console_config));
+                offsetof(struct virtio_console_config, emerg_wr));
     /* Spawn a new virtio-serial bus on which the ports will ride as devices */
     qbus_create_inplace(&vser->bus, sizeof(vser->bus), TYPE_VIRTIO_SERIAL_BUS,

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