Re: [Qemu-devel] virtio-serial guest agent channel timing requirements

[Stefan Hajnoczi]

On Fri, Nov 4, 2016 at 9:46 PM, Matt Broadstone <address@hidden> wrote:
> I've progressed with creating my own agent, and have successfully been
> able to communicate over virtio-serial channels in order to provide
> two-way communication between hypervisor and guest. My problem now
> seems to be related to _when_ to start listening to the domain sockets
> - specifically it seems that if I start listening to the domain
> sockets on the hypervisor side before the guest (in this case windows
> guest) is fully loaded, communication will fail over the channel until
> both sides hangup and try again. Is there any documentation on this
> behavior, or guidelines I should be following for when to begin
> communication over the channels?

That sounds odd.  I'd expect communicate to work as soon as both host
and guest are ready.

Have you tried a Linux guest instead of a Windows guest?  Perhaps it's
a bug in the virtio-win drivers.

Stefan