On Mon, Aug 31, 2015 at 02:30:06PM +0300, Michael S. Tsirkin wrote:
[snip..]
> > Then how about the other case:
> > When startup the vhost backend, user specify 8 queues, like:
> > Vhost-user ... -queues 8 # Y=8
> > When startup the guest, user specify 4 queues, like:
> > Qemu-kvm ... -queues 4 # X=4
> >
> > Vhost backend CAN support the queues number as much as the guest/qemu
> > requires,
> > And qemu don't want enable all of them(8 in the case), just part of
> > them(only 4 from 8).
> > Will qemu exit or go forward(of course with 4 queues)?
>
> I think it must go forward since guest does not have to
> configure all queues anyway - and that's built in to virtio spec.
>
> Note that # of queues in actual use in fact changes dynamically
> too, without restaring the device.
May I know how do you do that? I mean, is there a public interface, like
by some commands? Or, by sending vhost messages?
--yliu
