linux-kernel - Re: [PATCH] virtio-spec: clarify ro/rw bits and updating rule of virtio-net status field

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Message-ID: <87ty1jpm6p.fsf@rustcorp.com.au>
Date:	Tue, 20 Mar 2012 21:35:18 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Jason Wang <jasowang@...hat.com>, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, qemu-devel@...gnu.org,
	mst@...hat.com, Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: [PATCH] virtio-spec: clarify ro/rw bits and updating rule of virtio-net status field

On Tue, 20 Mar 2012 14:20:21 +0800, Jason Wang <jasowang@...hat.com> wrote:
> This patch clarifies VIRTIO_NET_S_LINK_UP as a read-only bit and
> VIRTIO_NET_S_ANNOUNCE as a read-writable bit. Also introduce the write 1 to
> clear semantics for all read-writable bits of config status field. This could
> help to reduce the config status field updating race between host and guest and
> also simplify the implementation.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>

This approach assumes an active config field, which neither lguest nor
S/390 have.

Thanks,
Rusty.
-- 
  How could I marry someone with more hair than me?  http://baldalex.org
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