From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([140.186.70.92]:51232)
	by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <hch@lst.de>)
	id 1Qbw3d-0008TS-Qs
	for Qemu-devel@nongnu.org; Wed, 29 Jun 2011 10:48:02 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <hch@lst.de>) id 1Qbw3c-0002v1-Ep
	for Qemu-devel@nongnu.org; Wed, 29 Jun 2011 10:48:01 -0400
Received: from verein.lst.de ([213.95.11.211]:51146 helo=newverein.lst.de)
	by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <hch@lst.de>)
	id 1Qbw3c-0002ut-1N
	for Qemu-devel@nongnu.org; Wed, 29 Jun 2011 10:48:00 -0400
Date: Wed, 29 Jun 2011 16:47:59 +0200
From: Christoph Hellwig <hch@lst.de>
Message-ID: <20110629144759.GA17085@lst.de>
References: <4E0B1399.4050807@redhat.com> <4E0B152B.1000201@codemonkey.ws>
	<4E0B1787.30709@redhat.com> <4E0B1943.4090400@codemonkey.ws>
	<20110629135059.GB15863@lst.de> <4E0B330F.7090307@codemonkey.ws>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <4E0B330F.7090307@codemonkey.ws>
Subject: Re: [Qemu-devel] Default cache mode
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Kevin Wolf <kwolf@redhat.com>, Avi Kivity <avi@redhat.com>, Christoph Hellwig <hch@lst.de>, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>, Qemu-devel@nongnu.org

On Wed, Jun 29, 2011 at 09:13:35AM -0500, Anthony Liguori wrote:
> Is WCE ever persisted by a disk?  Would it make sense to have a mechanism 
> to persist the WCE setting for a guest?

Only for SCSI, which has persistant mode pages.  For ATA I've not found
a way to make it persistent yet.