Re: [Xen-devel] question about i915 driver in dom0

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Jan 10, 2012 at 05:47:48AM +0000, Tian, Kevin wrote:
> > From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
> > Sent: Monday, January 09, 2012 11:05 PM
> > 
> > > > But more interestingly - are you building your kernel from scratch? 
> > > > There
> > >
> > > yes
> > >
> > > > was some requirements in having CONFIG_IOMMU_DMAR in the kernels -
> > > > otherwise
> > > > the intel-gtt.c would use the 'virt_to_phys' code instead of the DMA 
> > > > API.
> > >
> > > Suppose you mean CONFIG_DMAR_TABLE? There's no
> > CONFIG_IOMMU_DMAR
> > > in the latest kernel. Yes, I didn't enable that option, and will have a 
> > > try.
> > 
> > Yes, that is the option.
> > 
> > >
> > > But a side question is, will enabling VT-d in dom0 conflict with Xen's own
> > > VT-d operations?
> > 
> > No conflict. The Xen re-writes the DMAR table to be called XMAR so Linux's
> > parser won't pick it up.
> 
> Hi, Konrad,
> 
> this information is really great, and now X can be started smoothly, and also
> a simple glxgear runs well! :-) This options deserves an explicit mark in the
> wiki page btw.

Done! If you have a screenshot of the "defective" kernel build that would be 
usefull
as we can attach it to
http://wiki.xen.org/wiki/Paravirtualized_DRM#X_shows_a_checkerboard_or_just_random_stuff_when_using_i915

> 
> Thanks
> Kevin

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