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virtio-serial: Disallow generic ports at id 0

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Port 0 is reserved for virtconsole devices for backward compatibility
with the old -virtioconsole (from qemu 0.12) device type.

libvirt prior to commit 8e28c5d40200b4c5d483bd585d237b9d870372e5 used
port 0 for generic ports.  libvirt will no longer do that, but disallow
instantiating generic ports at id 0 from qemu as well.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Amit Shah 2011-02-03 13:05:07 +05:30
parent 6b331efb73
commit 0b8b716d6c
1 changed files with 9 additions and 0 deletions
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9
hw/virtio-console.c
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@ -11,6 +11,7 @@
*/
#include "qemu-char.h"
#include "qemu-error.h"
#include "virtio-serial.h"
typedef struct VirtConsole {
@ -113,6 +114,14 @@ static int virtserialport_initfn(VirtIOSerialPort *port)
{
VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
if (port->id == 0) {
/*
* Disallow a generic port at id 0, that's reserved for
* console ports.
*/
error_report("Port number 0 on virtio-serial devices reserved for virtconsole devices for backward compatibility.");
return -1;
}
return generic_port_init(vcon, port);
}