drm/i915/gvt: Fix a bug of unexpectedly clear scratch page table

During a vGPU reset, the scratch page table shouldn't be cleared, what
needs to be cleared should be the scratch page.

Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index 912d63b2ff447cb618a0fad438e9194ff6c952f7..d47b8b100ac282e75e2f0fedf789092c8bcf701f 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -2395,8 +2395,6 @@ void intel_vgpu_reset_ggtt(struct intel_vgpu *vgpu)
  */
 void intel_vgpu_reset_gtt(struct intel_vgpu *vgpu)
 {
-       int i;
-
        ppgtt_free_all_shadow_page(vgpu);
 
        /* Shadow pages are only created when there is no page
@@ -2406,11 +2404,4 @@ void intel_vgpu_reset_gtt(struct intel_vgpu *vgpu)
        intel_vgpu_free_mm(vgpu, INTEL_GVT_MM_PPGTT);
 
        intel_vgpu_reset_ggtt(vgpu);
-
-       /* clear scratch page for security */
-       for (i = GTT_TYPE_PPGTT_PTE_PT; i < GTT_TYPE_MAX; i++) {
-               if (vgpu->gtt.scratch_pt[i].page != NULL)
-                       memset(page_address(vgpu->gtt.scratch_pt[i].page),
-                               0, PAGE_SIZE);
-       }
 }