From 121d760d0788f95619049c63449d977065cab69d Mon Sep 17 00:00:00 2001
From: Zhi Wang <zhi.a.wang@intel.com>
Date: Fri, 29 Dec 2017 02:50:08 +0800
Subject: [PATCH] drm/i915/gvt: Clear the shadow page table entry after post-sync
Git-commit: 121d760d0788f95619049c63449d977065cab69d
Patch-mainline: v4.15-rc8
References: FATE#322643 bsc#1055900
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/i915/gvt/gtt.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- 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
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);
}