From: "Michael S. Tsirkin" <mst@redhat.com>
To: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org
Subject: Re: [PATCH 10/16] virtio: add API to enable VQs early
Date: Mon, 6 Oct 2014 17:51:47 +0300 [thread overview]
Message-ID: <20141006145147.GB29955@redhat.com> (raw)
In-Reply-To: <20141006160816.68490a49.cornelia.huck@de.ibm.com>
On Mon, Oct 06, 2014 at 04:08:16PM +0200, Cornelia Huck wrote:
> On Sun, 5 Oct 2014 19:07:19 +0300
> "Michael S. Tsirkin" <mst@redhat.com> wrote:
>
> > virtio spec requires DRIVER_OK to be set before
> > VQs are used, but some drivers use VQs before probe
> > function returns.
> > Since DRIVER_OK is set after probe, this violates the spec.
>
> "Even though transitional devices support this behaviour, we want to
> make it possible for those early callers to become spec compliant."
>
> ?
Exactly.
> >
> > Add API for drivers to call before using VQs.
> >
> > Sets DRIVER_OK internally.
> >
> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> > ---
> > include/linux/virtio_config.h | 17 +++++++++++++++++
> > 1 file changed, 17 insertions(+)
> >
> > diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
> > index e8f8f71..6127fc8 100644
> > --- a/include/linux/virtio_config.h
> > +++ b/include/linux/virtio_config.h
> > @@ -109,6 +109,23 @@ struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev,
> > return vq;
> > }
> >
> > +/**
> > + * virtio_early_enable_vqs - enable vq use in probe function
> > + * @vdev: the device
> > + *
> > + * Driver must call this to use vqs in the probe function.
> > + *
> > + * Note: vqs are enabled automatically after probe returns.
> > + */
> > +static inline
> > +void virtio_early_enable_vqs(struct virtio_device *dev)
> > +{
> > + unsigned status = dev->config->get_status(dev);
> > +
> > + BUG_ON(status & VIRTIO_CONFIG_S_DRIVER_OK);
> > + dev->config->set_status(dev, status | VIRTIO_CONFIG_S_DRIVER_OK);
> > +}
> > +
>
> Maybe virtio_enable_vqs_early() instead?
OK.
> > static inline
> > const char *virtio_bus_name(struct virtio_device *vdev)
> > {
next prev parent reply other threads:[~2014-10-06 14:48 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-05 16:06 [PATCH 00/16] virtio: fix spec compliance issues Michael S. Tsirkin
2014-10-05 16:06 ` [PATCH 01/16] virtio_pci: fix virtio spec compliance on restore Michael S. Tsirkin
2014-10-05 16:06 ` [PATCH 02/16] virtio: unify config_changed handling Michael S. Tsirkin
2014-10-06 9:20 ` Cornelia Huck
2014-10-05 16:06 ` [PATCH 03/16] virtio: refactor to use drv_to_virtio Michael S. Tsirkin
2014-10-06 10:34 ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 04/16] virtio-pci: move freeze/restore to virtio core Michael S. Tsirkin
2014-10-06 10:54 ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 05/16] virtio: defer config changed notifications Michael S. Tsirkin
2014-10-06 11:33 ` Cornelia Huck
2014-10-06 12:00 ` Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 06/16] virtio_blk: drop config_enable Michael S. Tsirkin
2014-10-06 11:42 ` Cornelia Huck
2014-10-06 12:09 ` Michael S. Tsirkin
2014-10-06 12:20 ` Cornelia Huck
2014-10-06 12:31 ` Michael S. Tsirkin
2014-10-06 12:55 ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 07/16] virtio-blk: drop config_mutex Michael S. Tsirkin
2014-10-06 11:48 ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 08/16] virtio_net: drop config_enable Michael S. Tsirkin
2014-10-06 11:50 ` Cornelia Huck
2014-10-06 12:10 ` Michael S. Tsirkin
2014-10-06 19:02 ` David Miller
2014-10-07 6:49 ` Michael S. Tsirkin
2014-10-07 15:36 ` David Miller
2014-10-07 15:42 ` Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 09/16] virtio-net: drop config_mutex Michael S. Tsirkin
2014-10-06 11:46 ` Sergei Shtylyov
2014-10-06 11:56 ` Michael S. Tsirkin
2014-10-06 12:07 ` Sergei Shtylyov
2014-10-06 12:22 ` Michael S. Tsirkin
2014-10-06 12:31 ` Sergei Shtylyov
2014-10-06 11:56 ` Cornelia Huck
2014-10-06 12:01 ` Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 10/16] virtio: add API to enable VQs early Michael S. Tsirkin
2014-10-06 14:08 ` Cornelia Huck
2014-10-06 14:51 ` Michael S. Tsirkin [this message]
2014-10-05 16:07 ` [PATCH 11/16] virtio_net: minor cleanup Michael S. Tsirkin
2014-10-06 12:06 ` Cornelia Huck
2014-10-05 16:07 ` [PATCH 12/16] virtio_net: enable VQs early Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 13/16] virtio_blk: " Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 14/16] virtio_console: " Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 15/16] 9p/trans_virtio: " Michael S. Tsirkin
2014-10-05 16:07 ` [PATCH 16/16] virtio_net: fix use after free on allocation failure Michael S. Tsirkin
2014-10-06 14:17 ` Cornelia Huck
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