[PATCH 22/22] drm/i915: Enable platform support for vGPU huge gtt pages

[Zhenyu Wang]

On 2017.12.20 16:14:19 +0800, Du, Changbin wrote:
> On Wed, Dec 20, 2017 at 04:11:05PM +0800, Zhenyu Wang wrote:
> > On 2017.12.20 15:48:35 +0800, changbin.du at intel.com wrote:
> > > From: Changbin Du <changbin.du at intel.com>
> > > 
> > > Now GVTg supports shadowing both 2M/64K huge gtt pages. So this is to
> > > remove the restriction on guest side.
> > > 
> > > Signed-off-by: Changbin Du <changbin.du at intel.com>
> > > ---
> > >  drivers/gpu/drm/i915/i915_gem.c | 9 ---------
> > >  1 file changed, 9 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> > > index dca15c1..727df2f 100644
> > > --- a/drivers/gpu/drm/i915/i915_gem.c
> > > +++ b/drivers/gpu/drm/i915/i915_gem.c
> > > @@ -5159,15 +5159,6 @@ int i915_gem_init(struct drm_i915_private *dev_priv)
> > >  {
> > >  	int ret;
> > >  
> > > -	/*
> > > -	 * We need to fallback to 4K pages since gvt gtt handling doesn't
> > > -	 * support huge page entries - we will need to check either hypervisor
> > > -	 * mm can support huge guest page or just do emulation in gvt.
> > > -	 */
> > > -	if (intel_vgpu_active(dev_priv))
> > > -		mkwrite_device_info(dev_priv)->page_sizes =
> > > -			I915_GTT_PAGE_SIZE_4K;
> > > -
> > 
> > For i915 guest, can't simply remove this, but require new pvinfo
> > capability bit for compatibility check.
> > 
> You mean all future drivers need to be compatible with old release?
> 

yeah, we always keep compatibility between new guest vs. older host.

-- 
Open Source Technology Center, Intel ltd.

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