From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Justin T. Gibbs" <gibbs@scsiguy.com>
Subject: Re: [PATCH 0 of 5] Add support for mapping grant
	references into HVM guests (+ some cleanup)
Date: Fri, 08 Jan 2010 16:43:38 -0700
Message-ID: <4B47C32A.8010802@scsiguy.com>
References: <C75158C9.4C5B%keir.fraser@eu.citrix.com>
Reply-To: gibbs@scsiguy.com
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <C75158C9.4C5B%keir.fraser@eu.citrix.com>
List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Keir Fraser <keir.fraser@eu.citrix.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
List-Id: xen-devel@lists.xenproject.org

On 12/18/2009 9:05 AM, Keir Fraser wrote:
> Support is already in the tree and will be part of Xen 4.0. See xen-unstable
> changeset 19932:c0cb307d927f.
>
>   -- Keir
>    

I have successfully integrated the 4.0 change into my 3.4.1 test 
system.  The changes works as expected
so long as the I/O is serviced via a copy from memory owned by the 
device domain.  However, iommu
mappings are not updated for HVM grant table updates so it is not 
possible to use DMA.  I am experimenting
with changes to update the iommu for p2m_grant_map* types but wonder is 
some overarching
architectural consideration I'm missing that would explain why the iommu 
was not updated in the original
changes?

--
Justin