[Intel-gfx] [PATCH v2] drm/i915: Fix vGPU balloon for ggtt guard page

[Chris Wilson]

On Fri, Mar 10, 2017 at 10:22:38AM +0800, Zhenyu Wang wrote:
> From commit a6508ded2a66 ("drm/i915: Use page coloring to provide the guard
> page at the end of the GTT"), we no longer explicitly subtract guard page
> at end for GGTT address space init, so shouldn't subtract that for vGPU
> balloon too, as that will leave that end page to be available for
> vGPU. Change balloon to cover full range too.
> 
> This fixes to use recent drm-intel tip kernel for guest OS. Found by GVT-g
> cmd parser that guest kernel uses end page as scratch then try to run
> MI_STORE_REG_MEM onto it.
> 
> v2: remove old comments
> 
> Cc: Terrence Xu <terrence.xu at intel.com>
> Signed-off-by: Zhenyu Wang <zhenyuw at linux.intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre