Re: [Qemu-devel] Is guest agent socket being closed upon reboot?

[Michael Roth <mdroth@linux.vnet.ibm.com>]

On 01/16/2012 07:26 AM, Michal Privoznik wrote:
> Hi,
>
> I'd like you to ask if/why is guest agent socked being closed upon guest
> reboot. I am using virtserialport to talk to guest agent:
>
> -chardev
> socket,id=charchannel0,path=/var/lib/libvirt/qemu/f16x86_64.agent,server,nowait
> -device
> virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
>
> I would understand if socket accept connection iff GA is up and running.
> However, this is not the case. One is perfectly able to connect to GA
> socket even without any GA inside guest.
>
> I think that GA socket should be as persistent as monitor. Even despite
> fact they address different areas. Application issuing monitor commands
> shouldn't be forced to reconnect on every guest reboot, should they?
>
> Or have I misunderstood the concept?
>
> Michal
>

Hi Michal,

In my testing this doesn't seem to be the case, the host socket 
connection persists throughout reboots, guest agent restarts, etc.

I'm not sure what would trigger the close either, the 
chr->chr_guest_close/chr->chr_guest_open events do not seem to be 
initialised at any point, which AFAICT are the only things that would 
affect the char frontend/socket connection during reboot.

Can you provide more details on your setup? What version/commit you're 
running and what sequence induces the behavior?

Thanks!