drm/i915/gvt: Clear the shadow page table entry after post-sync

A shadow page table entry needs to be cleared after being set as
post-sync. This patch fixes the recent error reported in Win7-32 test.

Fixes: 2707e4446688 ("drm/i915/gvt: vGPU graphics memory virtualization")
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index 8e33114..64d67ff 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -1359,12 +1359,15 @@ static int ppgtt_handle_guest_write_page_table_bytes(void *gp,
                        return ret;
        } else {
                if (!test_bit(index, spt->post_shadow_bitmap)) {
+                       int type = spt->shadow_page.type;
+
                        ppgtt_get_shadow_entry(spt, &se, index);
                        ret = ppgtt_handle_guest_entry_removal(gpt, &se, index);
                        if (ret)
                                return ret;
+                       ops->set_pfn(&se, vgpu->gtt.scratch_pt[type].page_mfn);
+                       ppgtt_set_shadow_entry(spt, &se, index);
                }
-
                ppgtt_set_post_shadow(spt, index);
        }