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

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> 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>

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