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    Subject[PATCH 4.14 068/118] drm/i915/gvt: Clear the shadow page table entry after post-sync
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    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);
    }


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