Patch "drm/i915/gvt: Clear the shadow page table entry after post-sync" has been added to the 4.14-stable tree

Patch "drm/i915/gvt: Clear the shadow page table entry after post-sync" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-i915-gvt-clear-the-shadow-page-table-entry-after-post-sync.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


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

From: Zhi Wang <zhi.a.wang@intel.com>

commit 121d760d0788f95619049c63449d977065cab69d upstream.

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>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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);
 	}
 


Patches currently in stable-queue which might be from zhi.a.wang@intel.com are

queue-4.14/drm-i915-gvt-clear-the-shadow-page-table-entry-after-post-sync.patch