diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index c26633d..ef25caa 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -415,12 +415,27 @@
 
 	/* Set interrupt-remapping table pointer */
 	cmd = iommu->gcmd | DMA_GCMD_SIRTP;
+	iommu->gcmd |= DMA_GCMD_SIRTP;
 	writel(cmd, iommu->reg + DMAR_GCMD_REG);
 
 	IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
 		      readl, (sts & DMA_GSTS_IRTPS), sts);
 	spin_unlock_irqrestore(&iommu->register_lock, flags);
 
+	if (mode == 0) {
+		spin_lock_irqsave(&iommu->register_lock, flags);
+
+		/* enable comaptiblity format interrupt pass through */
+		cmd = iommu->gcmd | DMA_GCMD_CFI;
+		iommu->gcmd |= DMA_GCMD_CFI;
+		writel(cmd, iommu->reg + DMAR_GCMD_REG);
+
+		IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
+			      readl, (sts & DMA_GSTS_CFIS), sts);
+
+		spin_unlock_irqrestore(&iommu->register_lock, flags);
+	}
+
 	/*
 	 * global invalidation of interrupt entry cache before enabling
 	 * interrupt-remapping.
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 3771cd1..aa8c531 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -164,6 +164,7 @@
 #define DMA_GCMD_QIE (((u32)1) << 26)
 #define DMA_GCMD_SIRTP (((u32)1) << 24)
 #define DMA_GCMD_IRE (((u32) 1) << 25)
+#define DMA_GCMD_CFI (((u32) 1) << 23)
 
 /* GSTS_REG */
 #define DMA_GSTS_TES (((u32)1) << 31)
@@ -174,6 +175,7 @@
 #define DMA_GSTS_QIES (((u32)1) << 26)
 #define DMA_GSTS_IRTPS (((u32)1) << 24)
 #define DMA_GSTS_IRES (((u32)1) << 25)
+#define DMA_GSTS_CFIS (((u32)1) << 23)
 
 /* CCMD_REG */
 #define DMA_CCMD_ICC (((u64)1) << 63)