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Re: [Qemu-devel] [PATCH v4 2/4] char: convert from GIOChannel to QIOChan
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] [PATCH v4 2/4] char: convert from GIOChannel to QIOChannel |
Date: |
Fri, 18 Mar 2016 16:56:37 +0000 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Fri, Mar 18, 2016 at 05:43:42PM +0100, Laurent Vivier wrote:
> Hi,
>
> testing something else (migration...) I've discovered (by bisecting)
> that this patch can allow to lock the machine. I'm using the pseries
> machine, but I think it should happen with PC too.
>
> I start a machine with:
>
> ...
> -device virtio-serial-pci,id=serial0 \
> -chardev socket,id=channel0,path=/tmp/serial_socket,server,nowait \
> -device virtserialport,bus=serial0.0,nr=1,chardev=channel0
>
> and I open the unix socket /tmp/serial_socket without reading it:
>
> $ python
> import socket
> sock = socket.socket(socket.AF_UNIX)
> sock.connect("/tmp/serial_socket_1")
>
> Then in the guest:
>
> cat /dev/zero > /dev/vport1p1
>
> -> at this point, the machine hangs until we read data in unix socket
> (we can't interact with monitor, we can't ping the machine...)
Pretty sure that'll be the same issue Andrew reported here
https://lists.gnu.org/archive/html/qemu-devel/2016-03/msg02843.html
can you see if his suggested addition works for you too
Regards,
Daniel
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