[PATCH v2] drm/i915/gvt: set shadow entry point to scratch page while p2m failed
Xiaoguang Chen
xiaoguang.chen at intel.com
Fri Mar 17 02:29:58 UTC 2017
Sometimes guest driver will write part of the GGTT entry(4 bytes)then
use it which will lead to a failure while trying to translate the gpa
to hpa.
Now in this situation we let the shadow entry pointing to a scratch page.
Signed-off-by: Zhi Wang <zhi.a.wang at intel.com>
Signed-off-by: Xiaoguang Chen <xiaoguang.chen at intel.com>
---
drivers/gpu/drm/i915/gvt/gtt.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index da73127..3bae2e5 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -1837,11 +1837,11 @@ static int emulate_gtt_mmio_write(struct intel_vgpu *vgpu, unsigned int off,
ret = gtt_entry_p2m(vgpu, &e, &m);
if (ret) {
gvt_vgpu_err("fail to translate guest gtt entry\n");
- return ret;
+ ops->set_pfn(&m, vgpu->gtt.scratch_pt[GTT_TYPE_GGTT_PTE].page_mfn);
}
} else {
m = e;
- m.val64 = 0;
+ ops->set_pfn(&m, vgpu->gtt.scratch_pt[GTT_TYPE_GGTT_PTE].page_mfn);
}
ggtt_set_shadow_entry(ggtt_mm, &m, g_gtt_index);
--
2.7.4
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