drm: fallback to dma_alloc_coherent when memory encryption is active

We can't just map any randome page we get when memory encryption is active. Signed-off-by: Christian König <[email protected]> Acked-by: Alex Deucher <[email protected]> Link: https://patchwork.kernel.org/patch/10850833/
jerrinot · Apr 1, 2019 · 64e1f83 · 64e1f83
1 parent 088aed8
commit 64e1f83
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/drivers/gpu/drm/drm_memory.c b/drivers/gpu/drm/drm_memory.c
@@ -168,6 +168,13 @@ bool drm_need_swiotlb(int dma_bits)
 	if (xen_pv_domain())
 		return true;
 
+	/*
+	 * Enforce dma_alloc_coherent when memory encryption is active as well
+	 * for the same reasons as for Xen paravirtual hosts.
+	 */
+	if (mem_encrypt_active())
+		return true;
+
 	for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
 		max_iomem = max(max_iomem,  tmp->end);
 	}