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Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop
From: |
Cornelia Huck |
Subject: |
Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop |
Date: |
Wed, 16 Mar 2016 13:42:57 +0100 |
On Wed, 16 Mar 2016 13:32:59 +0100
Paolo Bonzini <address@hidden> wrote:
> On 16/03/2016 13:22, Cornelia Huck wrote:
> >> > Yeah, it doesn't help that the functions are underdocumented (as in the
> >> > "assign" parameter above).
> > My understanding is:
> >
> > - 'assign': set up a new notifier (true) or disable it (false)
> > - 'set_handler': use our handler (true) or have it handled elsewhere
> > (false)
>
> Right. So if we're setting up a new notifier in
> virtio_queue_aio_set_host_notifier_handler, virtio_pci_stop_ioeventfd should
...do what? ;)
>
> > > > I don't think the ->set_host_notifiers() api really allows for this.
> > >
> > > I think it does, assign is the last argument to k->set_host_notifier().
> >
> > This depends on whether we want 'assign' to clean up any old notifiers
> > before setting up new ones. I think we want different behaviour for
> > dataplane and vhost.
>
> I think dataplane and vhost are the same.
>
> The question is whether ioeventfd=off,vhost=on or
> ioeventfd=off,dataplane=on are valid combinations; I think they aren't.
We should disallow that even temporary, then.
(This would imply that we need to drop the _stop_ioeventfd() call in
->set_host_notifier(), correct?)
> If they aren't, it should be okay to remove the
> virtio_queue_host_notifier_read call in
> virtio_queue_set_host_notifier_fd_handler and
> virtio_queue_aio_set_host_notifier_handler. That's because a handler
> for the notifier will always be set _somewhere_. It could be the usual
> ioeventfd handler, the vhost handler or the dataplane handler, but one
> will be there.
It should; but we probably need to do a final read when we stop the
ioeventfd.
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, (continued)
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Cornelia Huck, 2016/03/16
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Paolo Bonzini, 2016/03/16
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Cornelia Huck, 2016/03/16
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Paolo Bonzini, 2016/03/16
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Cornelia Huck, 2016/03/16
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Paolo Bonzini, 2016/03/16
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop,
Cornelia Huck <=
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Paolo Bonzini, 2016/03/16
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Cornelia Huck, 2016/03/16
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Paolo Bonzini, 2016/03/16
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Cornelia Huck, 2016/03/16
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Paolo Bonzini, 2016/03/16
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Cornelia Huck, 2016/03/16
- Re: [Qemu-devel] [PATCH 0/4] Tweaks around virtio-blk start/stop, Paolo Bonzini, 2016/03/16