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

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi,

On 17/07/2015 20:05, 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_off option that is similar to Linux intel_iommu=igfx_off for
> users to manually workaround the problem.
I would prefer to see the introduction of intel_iommu parameter in the 
vtd code rather than extending again the iommu parameter with intel 
specific options in the common code which is both for ARM and x86.
Regards,

--
Julien Grall

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