diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
index 98b1084..5f76a9e 100644
--- a/arch/arm/include/asm/xen/page.h
+++ b/arch/arm/include/asm/xen/page.h
@@ -52,7 +52,26 @@
 	return mfn;
 }
 
-#define mfn_to_local_pfn(mfn) mfn_to_pfn(mfn)
+/* Pseudo-physical <-> BUS conversion */
+static inline unsigned long pfn_to_bfn(unsigned long pfn)
+{
+	unsigned long mfn;
+
+	if (phys_to_mach.rb_node != NULL) {
+		mfn = __pfn_to_mfn(pfn);
+		if (mfn != INVALID_P2M_ENTRY)
+			return mfn;
+	}
+
+	return pfn;
+}
+
+static inline unsigned long bfn_to_pfn(unsigned long bfn)
+{
+	return bfn;
+}
+
+#define bfn_to_local_pfn(bfn)	bfn_to_pfn(bfn)
 
 /* VIRT <-> MACHINE conversion */
 #define virt_to_mfn(v)		(pfn_to_mfn(virt_to_pfn(v)))
@@ -96,7 +115,7 @@
 
 bool xen_arch_need_swiotlb(struct device *dev,
 			   unsigned long pfn,
-			   unsigned long mfn);
+			   unsigned long bfn);
 unsigned long xen_get_swiotlb_free_pages(unsigned int order);
 
 #endif /* _ASM_ARM_XEN_PAGE_H */
diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index 03e75fe..6dd911d 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -139,9 +139,9 @@
 
 bool xen_arch_need_swiotlb(struct device *dev,
 			   unsigned long pfn,
-			   unsigned long mfn)
+			   unsigned long bfn)
 {
-	return (!hypercall_cflush && (pfn != mfn) && !is_device_dma_coherent(dev));
+	return (!hypercall_cflush && (pfn != bfn) && !is_device_dma_coherent(dev));
 }
 
 int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index a3804fb..724bffb 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -176,6 +176,10 @@
 	return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
 }
 
+/* Pseudo-physical <-> Bus conversion */
+#define pfn_to_bfn(pfn)		pfn_to_mfn(pfn)
+#define bfn_to_pfn(bfn)		mfn_to_pfn(bfn)
+
 /*
  * We detect special mappings in one of two ways:
  *  1. If the MFN is an I/O page then Xen will set the m2p entry
@@ -196,7 +200,7 @@
  *      require. In all the cases we care about, the FOREIGN_FRAME bit is
  *      masked (e.g., pfn_to_mfn()) so behaviour there is correct.
  */
-static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
+static inline unsigned long bfn_to_local_pfn(unsigned long mfn)
 {
 	unsigned long pfn;
 
@@ -262,7 +266,7 @@
 
 static inline bool xen_arch_need_swiotlb(struct device *dev,
 					 unsigned long pfn,
-					 unsigned long mfn)
+					 unsigned long bfn)
 {
 	return false;
 }
diff --git a/drivers/xen/biomerge.c b/drivers/xen/biomerge.c
index 0edb91c..8ae2fc90 100644
--- a/drivers/xen/biomerge.c
+++ b/drivers/xen/biomerge.c
@@ -6,10 +6,10 @@
 bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
 			       const struct bio_vec *vec2)
 {
-	unsigned long mfn1 = pfn_to_mfn(page_to_pfn(vec1->bv_page));
-	unsigned long mfn2 = pfn_to_mfn(page_to_pfn(vec2->bv_page));
+	unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page));
+	unsigned long bfn2 = pfn_to_bfn(page_to_pfn(vec2->bv_page));
 
 	return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
-		((mfn1 == mfn2) || ((mfn1+1) == mfn2));
+		((bfn1 == bfn2) || ((bfn1+1) == bfn2));
 }
 EXPORT_SYMBOL(xen_biovec_phys_mergeable);
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 4c54932..d757a3e 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -82,8 +82,8 @@
  */
 static inline dma_addr_t xen_phys_to_bus(phys_addr_t paddr)
 {
-	unsigned long mfn = pfn_to_mfn(PFN_DOWN(paddr));
-	dma_addr_t dma = (dma_addr_t)mfn << PAGE_SHIFT;
+	unsigned long bfn = pfn_to_bfn(PFN_DOWN(paddr));
+	dma_addr_t dma = (dma_addr_t)bfn << PAGE_SHIFT;
 
 	dma |= paddr & ~PAGE_MASK;
 
@@ -92,7 +92,7 @@
 
 static inline phys_addr_t xen_bus_to_phys(dma_addr_t baddr)
 {
-	unsigned long pfn = mfn_to_pfn(PFN_DOWN(baddr));
+	unsigned long pfn = bfn_to_pfn(PFN_DOWN(baddr));
 	dma_addr_t dma = (dma_addr_t)pfn << PAGE_SHIFT;
 	phys_addr_t paddr = dma;
 
@@ -110,15 +110,15 @@
 					     unsigned int offset,
 					     size_t length)
 {
-	unsigned long next_mfn;
+	unsigned long next_bfn;
 	int i;
 	int nr_pages;
 
-	next_mfn = pfn_to_mfn(pfn);
+	next_bfn = pfn_to_bfn(pfn);
 	nr_pages = (offset + length + PAGE_SIZE-1) >> PAGE_SHIFT;
 
 	for (i = 1; i < nr_pages; i++) {
-		if (pfn_to_mfn(++pfn) != ++next_mfn)
+		if (pfn_to_bfn(++pfn) != ++next_bfn)
 			return 0;
 	}
 	return 1;
@@ -138,8 +138,8 @@
 
 static int is_xen_swiotlb_buffer(dma_addr_t dma_addr)
 {
-	unsigned long mfn = PFN_DOWN(dma_addr);
-	unsigned long pfn = mfn_to_local_pfn(mfn);
+	unsigned long bfn = PFN_DOWN(dma_addr);
+	unsigned long pfn = bfn_to_local_pfn(bfn);
 	phys_addr_t paddr;
 
 	/* If the address is outside our domain, it CAN