linux-kernel - Re: [PATCH v3 2/3] vhost: Use vhost_get_used_size() in vhost_vring_set

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Message-ID: <20201011024636-mutt-send-email-mst@kernel.org>
Date:   Sun, 11 Oct 2020 02:46:49 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Greg Kurz <groug@...d.org>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, qemu-devel@...gnu.org,
        Laurent Vivier <laurent@...ier.eu>,
        David Gibson <david@...son.dropbear.id.au>
Subject: Re: [PATCH v3 2/3] vhost: Use vhost_get_used_size() in
 vhost_vring_set_addr()

On Sat, Oct 10, 2020 at 10:32:13AM +0800, Jason Wang wrote:
> 
> On 2020/10/3 下午6:02, Greg Kurz wrote:
> > The open-coded computation of the used size doesn't take the event
> > into account when the VIRTIO_RING_F_EVENT_IDX feature is present.
> > Fix that by using vhost_get_used_size().
> > 
> > Signed-off-by: Greg Kurz <groug@...d.org>
> > ---
> >   drivers/vhost/vhost.c |    3 +--
> >   1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
> > index c3b49975dc28..9d2c225fb518 100644
> > --- a/drivers/vhost/vhost.c
> > +++ b/drivers/vhost/vhost.c
> > @@ -1519,8 +1519,7 @@ static long vhost_vring_set_addr(struct vhost_dev *d,
> >   		/* Also validate log access for used ring if enabled. */
> >   		if ((a.flags & (0x1 << VHOST_VRING_F_LOG)) &&
> >   			!log_access_ok(vq->log_base, a.log_guest_addr,
> > -				sizeof *vq->used +
> > -				vq->num * sizeof *vq->used->ring))
> > +				       vhost_get_used_size(vq, vq->num)))
> >   			return -EINVAL;
> >   	}
> > 
> > 
> 
> Acked-by: Jason Wang <jasowang@...hat.com>

Linus already merged this, I can't add your ack, sorry!