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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.01.16 at 08:38, <thierry.laurion@xxxxxxxxx> wrote:
> Thinkpad x200 p8600 laptops have vt-d, vt-x and tpm. They also have intel
> integrated graphics 4 Series (gm45 chipset), supported through i915 driver.
> 
> In December, a fix got introduced to Xen 4.6 through iommu=no-igfx switch.
> Before that fix, it was impossible to boot xen without passing iommu=0.
> 
> With iommu=no-igfx passed on, Qubes boots xen, kernel, dom0 and domu until
> some graphic rendering is done from a domu to dom0 xserver.
> 
> I'm trying to push forward IOMMU support of gm45 chipset here. The problem
> is between i915 and xen iommu support for sure, but there is no crash or
> interesting debugging information given on a serial console.

To be honest, even after having read you second mail I'm not quite
clear what it you want and/or what doesn't work. Adding some
guessing, I could interpret the above as you wanting to pass through
the graphics device. If that's the case, then this is quite clearly a
pretty bad idea with the IOMMU behind it disabled.

Jan


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