drm/i915/gvt: Fix kernel oops for 3-level ppgtt guest

[sfrench/cifs-2.6.git] / drivers / gpu / drm / i915 / gvt / scheduler.c

diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c
index cb11c31840857293ff2d3b7a0d7688e4ccf02e35..0f1d6998cf9cee7b585b8a4d0e7af3ea1c1c5a57 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/scheduler.c
+++ b/drivers/gpu/drm/i915/gvt/scheduler.c
@@ -379,7 +379,11 @@ static void set_context_ppgtt_from_shadow(struct intel_vgpu_workload *workload,
                for (i = 0; i < GVT_RING_CTX_NR_PDPS; i++) {
                        struct i915_page_directory * const pd =
                                i915_pd_entry(ppgtt->pd, i);
-
+                       /* skip now as current i915 ppgtt alloc won't allocate
+                          top level pdp for non 4-level table, won't impact
+                          shadow ppgtt. */
+                       if (!pd)
+                               break;
                        px_dma(pd) = mm->ppgtt_mm.shadow_pdps[i];
                }
        }