Re: [Xen-devel] pre Sandy bridge IOMMU support (gm45)

[Thierry Laurion <thierry.laurion@xxxxxxxxx>]

It seems that IGD iommu is not completely deactivated, yes, since memory corruption happens (graphic glitches and then system hang)

General iommu is still reported as being active by xen, as desired.

Thierry

LeÂmar. 26 janv. 2016 17:21,ÂTian, Kevin <kevin.tian@xxxxxxxxx> a ÃcritÂ:

> From: Jan Beulich
> Sent: Tuesday, January 26, 2016 8:28 PM
>
> >>> On 26.01.16 at 12:57, <thierry.laurion@xxxxxxxxx> wrote:
> > Only dom0 talks directly to the i915 driver, other appvm being pv, which is
> > why I put in question the complete deactivation of IGD by iommu=no-igfx.
> >
> > Is there anything I can provide to troubleshoot?
>
> Hard to tell. The VT-d maintainers may be able to give you better
> guidance.
>
> Jan
>

I'm a bit confused what's being exactly asked here. Did you mean
that IOMMU is not actually disabled when you set iommu=no-gfx?

Thanks
Kevin

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