From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wei Liu <wei.liu2@citrix.com>
Subject: Re: [PATCH v4] VT-d: add iommu=igfx option to
 workaround graphics issues
Date: Thu, 6 Aug 2015 09:25:31 +0100
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To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: Wei Liu <wei.liu2@citrix.com>, Ting-Wei Lan <lantw44@gmail.com>, Andrew Cooper <andrew.cooper3@citrix.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, Julien Grall <julien.grall@citrix.com>, Jan Beulich <jbeulich@suse.com>, "Zhang, Yang Z" <yang.z.zhang@intel.com>
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On Thu, Aug 06, 2015 at 12:49:51AM +0000, Tian, Kevin wrote:
> > From: Ting-Wei Lan [mailto:lantw44@gmail.com]
> > Sent: Thursday, August 06, 2015 1:10 AM
> > 
> > When using Linux >= 3.19 (commit 47591df) as dom0 on some Intel Ironlake
> > devices, It is possible to encounter graphics issues that make screen
> > unreadable or crash the system. It was reported in freedesktop bugzilla:
> > 
> > https://bugs.freedesktop.org/show_bug.cgi?id=90037
> > 
> > As we still cannot find a proper fix for this problem, this patch adds
> > iommu=igfx option to control whether Intel graphics IOMMU is enabled.
> > Running Xen with iommu=no-igfx is similar to running Linux with
> > intel_iommu=igfx_off, which disables IOMMU for Intel GPU. This can be
> > used by users to manually workaround the problem before a fix is
> > available for i915 driver.
> > 
> > Signed-off-by: Ting-Wei Lan <lantw44@gmail.com>
> > Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
> > Release-acked-by: Wei Liu <wei.liu2@citrix.com>
> 
> Acked-by: Kevin Tian <kevin.tian@intel.com>

Thanks for the quick turnaround!

Wei.