Re: [PATCH 2/7] drm/i915: Enable full ppgtt for vgpu

[Daniel Vetter <daniel@ffwll.ch>]

On Thu, Aug 20, 2015 at 01:57:13PM +0300, Joonas Lahtinen wrote:
> On to, 2015-08-20 at 15:45 +0800, Zhiyuan Lv wrote:
> > The full ppgtt is supported in Intel GVT-g device model. So the
> > restriction can be removed.
> > 
> > Signed-off-by: Zhiyuan Lv <zhiyuan.lv@intel.com>
> > Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
> 
> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> 
> > ---
> >  drivers/gpu/drm/i915/i915_gem_gtt.c | 3 ---
> >  1 file changed, 3 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c 
> > b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > index ed10e77..823005c 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > @@ -108,9 +108,6 @@ static int sanitize_enable_ppgtt(struct 
> > drm_device *dev, int enable_ppgtt)
> >  	has_aliasing_ppgtt = INTEL_INFO(dev)->gen >= 6;
> >  	has_full_ppgtt = INTEL_INFO(dev)->gen >= 7;
> >  
> > -	if (intel_vgpu_active(dev))
> > -		has_full_ppgtt = false; /* emulation is too hard */

Don't we need a feature check for the virtual gpu here? Or at least a
platform check? Seems like the backwards/forwards compat story isn't too
thought out yet here. Note that the kernel of the host and the guest might
not be the same at all, much less the kvm part.
-Daniel

> > -
> >  	/*
> >  	 * We don't allow disabling PPGTT for gen9+ as it's a 
> > requirement for
> >  	 * execlists, the sole mechanism available to submit work.
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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