[PATCH 1/4] drm/i915/gvt: refine ggtt range validation

[Xiong Zhang]

The vgpu ggtt range should be in vgpu aperture or hidden range. This
patch enforce begin and end address check and guarantee both of them are
in the valid range.

For size=0, it will regress to vgpu_gmadr_is_valid(), will refine
this usage in a later fix.

Fixes: 2707e4446688 ("drm/i915/gvt: vGPU graphics memory virtualization")
Signed-off-by: Xiong Zhang <xiong.y.zhang at intel.com>
---
 drivers/gpu/drm/i915/gvt/gtt.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c
index f3a75bb..d767c45 100644
--- a/drivers/gpu/drm/i915/gvt/gtt.c
+++ b/drivers/gpu/drm/i915/gvt/gtt.c
@@ -53,13 +53,19 @@ static int preallocated_oos_pages = 8192;
  */
 bool intel_gvt_ggtt_validate_range(struct intel_vgpu *vgpu, u64 addr, u32 size)
 {
-	if ((!vgpu_gmadr_is_valid(vgpu, addr)) || (size
-			&& !vgpu_gmadr_is_valid(vgpu, addr + size - 1))) {
-		gvt_vgpu_err("invalid range gmadr 0x%llx size 0x%x\n",
-				addr, size);
-		return false;
-	}
-	return true;
+	if (size == 0)
+		return vgpu_gmadr_is_valid(vgpu, addr);
+
+	if (vgpu_gmadr_is_aperture(vgpu, addr) &&
+	    vgpu_gmadr_is_aperture(vgpu, addr + size - 1))
+		return true;
+	else if (vgpu_gmadr_is_hidden(vgpu, addr) &&
+		 vgpu_gmadr_is_hidden(vgpu, addr + size - 1))
+		return true;
+
+	gvt_dbg_mm("Invalid ggtt range at 0x%llx, size: 0x%x\n",
+		     addr, size);
+	return false;
 }
 
 /* translate a guest gmadr to host gmadr */
-- 
2.7.4