diff options
| author | Xiaoguang Chen <xiaoguang.chen@intel.com> | 2017-03-21 10:54:21 +0800 |
|---|---|---|
| committer | Zhenyu Wang <zhenyuw@linux.intel.com> | 2017-03-21 11:15:40 +0800 |
| commit | 359b69310014511901bd61cc5f7680cb5de1faef (patch) | |
| tree | f5af204f7d665391560240b340d61a7b95fdc453 /drivers/gpu | |
| parent | 14f5ba26aa7060b4cad9c4c288b9a785bd0cd1a8 (diff) | |
| download | linux-359b69310014511901bd61cc5f7680cb5de1faef.tar.bz2 | |
drm/i915/gvt: set shadow entry to scratch page while p2m failed
Sometimes guest driver will only update partial of the GGTT entry then
access it. In this situation a failure will happen while translating
the gpa to hpa.
Now in this situation we let the corresponding shadow entry pointing
to a scratch page.
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Xiaoguang Chen <xiaoguang.chen@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/gvt/gtt.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c index da7312715824..b832bea64e03 100644 --- a/drivers/gpu/drm/i915/gvt/gtt.c +++ b/drivers/gpu/drm/i915/gvt/gtt.c @@ -1837,11 +1837,15 @@ 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; + /* guest driver may read/write the entry when partial + * update the entry in this situation p2m will fail + * settting the shadow entry to point to a scratch page + */ + ops->set_pfn(&m, gvt->gtt.scratch_ggtt_mfn); } } else { m = e; - m.val64 = 0; + ops->set_pfn(&m, gvt->gtt.scratch_ggtt_mfn); } ggtt_set_shadow_entry(ggtt_mm, &m, g_gtt_index); |