diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index de87b0282e7420feaf4282e7ba835074b61512a7..1d2f147f737d997f38edc8cfb9c28f2e47f943a0 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -168,7 +168,12 @@ int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
 int dma_direct_supported(struct device *dev, u64 mask)
 {
 #ifdef CONFIG_ZONE_DMA
-	if (mask < phys_to_dma(dev, DMA_BIT_MASK(ARCH_ZONE_DMA_BITS)))
+	/*
+	 * This check needs to be against the actual bit mask value, so
+	 * use __phys_to_dma() here so that the SME encryption mask isn't
+	 * part of the check.
+	 */
+	if (mask < __phys_to_dma(dev, DMA_BIT_MASK(ARCH_ZONE_DMA_BITS)))
 		return 0;
 #else
 	/*
@@ -176,8 +181,12 @@ int dma_direct_supported(struct device *dev, u64 mask)
 	 * to be able to satisfy them - either by not supporting more physical
 	 * memory, or by providing a ZONE_DMA32.  If neither is the case, the
 	 * architecture needs to use an IOMMU instead of the direct mapping.
+	 *
+	 * This check needs to be against the actual bit mask value, so
+	 * use __phys_to_dma() here so that the SME encryption mask isn't
+	 * part of the check.
 	 */
-	if (mask < phys_to_dma(dev, DMA_BIT_MASK(32)))
+	if (mask < __phys_to_dma(dev, DMA_BIT_MASK(32)))
 		return 0;
 #endif
 	/*