Re: [Xen-devel] [PATCH v4] VT-d: add iommu=igfx option to workaround graphics issues

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Aug 06, 2015 at 12:49:51AM +0000, Tian, Kevin wrote:
> > From: Ting-Wei Lan [mailto:lantw44@xxxxxxxxx]
> > 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@xxxxxxxxx>
> > Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> > Release-acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> 
> Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

Thanks for the quick turnaround!

Wei.

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