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

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
> Sent: Tuesday, January 10, 2012 10:39 PM
> 
> 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_j
> ust_random_stuff_when_using_i915

I'll see whether I can take one. Need to find a way which can capture the screen
before X is fully started. My working environment prevents from using camera. :/

Thanks
Kevin

> 
> >
> > Thanks
> > Kevin

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