[PATCH v3 19/22] drm/i915/gvt: Ignore guest write to unused PTE entries
changbin.du at intel.com
changbin.du at intel.com
Fri Dec 22 08:07:25 UTC 2017
From: Changbin Du <changbin.du at intel.com>
For page table which has 64K gtt entry, only PTE#0, PTE#16, PTE#32, ...
PTE#496 are used. Unused PTEs update should be ignored.
Signed-off-by: Changbin Du <changbin.du at intel.com>
---
drivers/gpu/drm/i915/gvt/gtt.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index 73a9823..dfa3139 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -1658,6 +1658,13 @@ static int ppgtt_handle_guest_write_page_table_bytes(
ppgtt_get_guest_entry(spt, &we, index);
+ if (we.type == GTT_TYPE_PPGTT_PTE_64K_ENTRY &&
+ (index % GTT_64K_PTE_STRIDE)) {
+ gvt_vdbg_mm("Ignore write to unused PTE entry, index %lu\n",
+ index);
+ return 0;
+ }
+
if (bytes == info->gtt_entry_size) {
ret = ppgtt_handle_guest_write_page_table(spt, &we, index);
if (ret)
--
2.7.4
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