From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [PATCH] amd iommu: re-enable iommu msi if dom0
 disabled it
Date: Fri, 8 Jun 2012 14:31:52 +0100
Message-ID: <4FD1FEC8.5000708@citrix.com>
References: <4FD1FDE2.5010907@amd.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <4FD1FDE2.5010907@amd.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Wei Wang <wei.wang2@amd.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, "Keir (Xen.org)" <keir@xen.org>, Jan Beulich <JBeulich@suse.com>
List-Id: xen-devel@lists.xenproject.org

On 08/06/12 14:28, Wei Wang wrote:
> Hi Jan,
> I found that recent dom0 (e.g 3.4 pv_ops) disables iommu msi capability =

> for some reasons and iommu cannot generate any interrupts in this case.
> Attached patch re-enables it in device assignment.

Under which circumstances should dom0 able to play with the IOMMUs ? =

Surely the fact that dom0 can play with the IOMMUs is a bug in itself.

>
> Thanks,
> Wei
>
> --
> Advanced Micro Devices GmbH
> Sitz: Dornach, Gemeinde Aschheim,
> Landkreis M=FCnchen Registergericht M=FCnchen,
> HRB Nr. 43632 WEEE Registrierungsnummer 129 19551
> Gesch=E4ftsf=FChrer:
> Alberto Bozzo

-- =

Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com