drm/i915/gvt: don't rely on guest PPGTT entry to free old shadow data
On guest writing a PPGTT entry, if it contains value and the old entry is valid, gvt will read it and find & free the corresponding old data for it. However, with the KVM write protection provided by page_track, the guest entry will be written with new value before gvt handling. To avoid that, we should use the shadow entry instead. Signed-off-by: NBing Niu <bing.niu@intel.com> Signed-off-by: NJike Song <jike.song@intel.com> Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>
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