[Intel-gfx] [PATCH v1] drm/i915: Enhanced for initialize partially filled pagetables

[Xiaolin Zhang]

if vgpu active, the page table entry should be initialized after
allocation and then the hypersivor can ping pages succesuffly,
otherwise hypervisor will ping pages failed and the host will print
a lot of annoying errors such as “ERROR gvt: guest page write error -22,
gfn 0x7ada8, pa 0x7ada89a8, var 0x6, len 1” when create linux guest.

Signed-off-by: Xiaolin Zhang <xiaolin.zhang at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 731ce229a923..be52b139817d 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1175,7 +1175,7 @@ static int gen8_ppgtt_alloc_pd(struct i915_address_space *vm,
 			if (IS_ERR(pt))
 				goto unwind;
 
-			if (count < GEN8_PTES)
+			if (count < GEN8_PTES || intel_vgpu_active(vm->i915))
 				gen8_initialize_pt(vm, pt);
 
 			gen8_ppgtt_set_pde(vm, pd, pt, pde);
-- 
2.14.1