Re: [Xen-devel] [PATCH v2] VT-d: add iommu=igfx option to workaround graphics issues

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 25/07/2015 17:57, Ting-Wei Lan wrote:
> 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 on
> these devices. Running Xen with iommu=no-igfx is similar to running
> Linux with intel_iommu=igfx_off, which disables IOMMU for Intel Ironlake
> 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>

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