drm/i915/gvt: don't rely on guest PPGTT entry to free old shadow data

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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: Bing Niu <bing.niu@intel.com>
Signed-off-by: Jike Song <jike.song@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

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Bing Niu 2016-11-07 10:44:36 +08:00 • committed by Zhenyu Wang

parent 11840e2fff

commit 9baf0920b5

1 changed files with 17 additions and 34 deletions

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drivers/gpu/drm/i915/gvt/gtt.c

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