RE: [PATCH] viostor driver.Add memory barrier - synch with fix for Linux guests by Michael S. Tsirkin <mst@redhat.com>

["Yan Vugenfirer" <yvugenfi@redhat.com>]

Committed. Thanks.


> -----Original Message-----
> From: kvm-owner@vger.kernel.org [mailto:kvm-owner@vger.kernel.org] On
> Behalf Of Vadim Rozenfeld
> Sent: Sunday, November 01, 2009 12:41 PM
> To: kvm@vger.kernel.org
> Subject: [PATCH] viostor driver.Add memory barrier - synch with fix for
> Linux guests by Michael S. Tsirkin <mst@redhat.com>
> 
> 
> repository: /home/vadimr/shares/kvm-guest-drivers-windows
> branch: XP
> commit 6906acfc2d5f58df43ebc9c190e1447ff6e63a01
> Author: Vadim Rozenfeld<vrozenfe@redhat.com>
> Date:   Sun Nov 1 11:54:03 2009 +0200
> 
>      [PATCH] viostor driver.Add memory read barrier - synch with fix
> for Linux guests by Michael S. Tsirkin<mst@redhat.com>
> 
>      Signed-off-by: Vadim Rozenfeld<vrozenfe@redhat.com>
> 
> diff --git a/viostor/virtio_ring.c b/viostor/virtio_ring.c index
> d099bb8..2911cef 100644
> --- a/viostor/virtio_ring.c
> +++ b/viostor/virtio_ring.c
> @@ -237,6 +237,8 @@ vring_get_buf(
>           return NULL;
>       }
> 
> +    rmb();
> +
>       i = vq->vring.used->ring[vq->last_used_idx%vq->vring.num].id;
>       *len = vq->vring.used->ring[vq->last_used_idx%vq->vring.num].len;
>