From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: [PATCH] VT-d: prevent dom0 to use VT-d HW
Date: Wed, 09 Sep 2009 15:32:08 -0700
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To: "Han, Weidong" <weidong.han@intel.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, "Kay,
	Allen M" <allen.m.kay@intel.com>, "'Keir.Fraser@eu.citrix.com'" <Keir.Fraser@eu.citrix.com>
List-Id: xen-devel@lists.xenproject.org

On 09/07/09 19:24, Han, Weidong wrote:
> pv-ops dom0 contains Linux upstream VT-d driver, and will go to enable it when VT-d is set in kernel config file. It should not enable VT-d in dom0.
>
> Currently it already zaps ACPI DMAR signature to prevents dom0 using VT-d HW when VT-d is enabled for Xen. But when VT-d is not enabled for Xen, and VT-d is set in pv-ops kernel config file, pv-ops dom0 will go to enable it. This will results in pv-ops dom0 booting failure. This patch prevents dom0 to use VT-d HW whether VT-d is enabled or disabled for Xen. 
>   

Which tree is this against?  My dom0 tree doesn't have
drivers/passthrough/vtd/.  Is there a branch you'd like me to pull in?

Thanks,
    J