From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from [140.186.70.92] (port=58164 helo=eggs.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1PrUDU-00020j-MI
	for qemu-devel@nongnu.org; Mon, 21 Feb 2011 06:46:13 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <mst@redhat.com>) id 1PrUDT-0003cH-2J
	for qemu-devel@nongnu.org; Mon, 21 Feb 2011 06:46:12 -0500
Received: from mx1.redhat.com ([209.132.183.28]:24606)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <mst@redhat.com>) id 1PrUDS-0003aU-OZ
	for qemu-devel@nongnu.org; Mon, 21 Feb 2011 06:46:11 -0500
Date: Mon, 21 Feb 2011 13:46:02 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
Message-ID: <20110221114602.GA5557@redhat.com>
References: <FBDE6FBB4662C043AC9EECB95F62CDDE15E722@039-SN1MPN1-005.039d.mgd.msft.net>
	<20110221112217.GB4450@redhat.com>
	<FBDE6FBB4662C043AC9EECB95F62CDDE15E80D@039-SN1MPN1-005.039d.mgd.msft.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <FBDE6FBB4662C043AC9EECB95F62CDDE15E80D@039-SN1MPN1-005.039d.mgd.msft.net>
Subject: [Qemu-devel] Re: Vhost support
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/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: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Liu Yu-B13201 <B13201@freescale.com>
Cc: Yoder Stuart-B08248 <B08248@freescale.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On Mon, Feb 21, 2011 at 11:41:39AM +0000, Liu Yu-B13201 wrote:
>  
> 
> > -----Original Message-----
> > From: Michael S. Tsirkin [mailto:mst@redhat.com] 
> > Sent: Monday, February 21, 2011 7:22 PM
> > To: Liu Yu-B13201
> > Cc: qemu-devel@nongnu.org; Yoder Stuart-B08248
> > Subject: Re: Vhost support
> > 
> > On Mon, Feb 21, 2011 at 11:13:33AM +0000, Liu Yu-B13201 wrote:
> > > 
> > > Hello everyone,
> > > 
> > > Does anyone know the status of vhost in upstream qemu?
> > > We would like to try vhost with kvm on powerpc e500v2 platform,
> > > but obviously, powerpc kvm only works with upstream qemu.
> > > 
> > > KVM wike page says it needs to enable CONFIG_PCI_MSI for 
> > guest kernel.
> > > Is MSI a necessary?
> > > 
> > > Thanks,
> > > Yu
> > 
> > At the moment, yes.
> > The issue is not with vhost, it's that irqfd in kvm
> > only works with MSI at the moment.
> > 
> 
> Hi Michael,
> 
> Thanks for your answer.
> But I don't find MSI or irqfd support in upstream qemu.
> Does it mean upstream qemu not support virtio/vhost for now?
> 
> 
> Thanks,
> Yu

Ahm you mean not qemu-kvm?  It does, just slowly by going through
userspace.  You can force vhost bouncing without msi as well, by
setting vhostforce.

-- 
MST