diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index 3dc8d6b..6b02a03 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -35,6 +35,10 @@
 #include <linux/rbtree.h>
 #include <linux/module.h>
 #include <linux/uaccess.h>
+#include <asm/page.h>
+#include <asm/pgtable_types.h>
+#include <xen/xen.h>
+#include <asm/xen/page.h>
 
 #define TTM_BO_VM_NUM_PREFAULT 16
 
@@ -69,6 +73,137 @@ static struct ttm_buffer_object *ttm_bo_vm_lookup_rb(struct ttm_bo_device *bdev,
 	return best_bo;
 }
 
+void print_pte(char *what, struct page *page, unsigned int pfn, unsigned long address)
+{
+	static const char * const level_name[] =
+	  { "NONE", "4K", "2M", "1G", "NUM" };
+	unsigned long addr = 0;
+	pte_t *pte = NULL;
+	pteval_t val = (pteval_t)0;
+	unsigned int level = 0;
+	unsigned offset;
+	unsigned long phys;
+	pgprotval_t prot;
+	char buf[80];
+	char *str;
+
+	str = buf;
+	// Figure out if the address is pagetable.
+	if (address == 0 && page)
+		addr = (u64)page_address(page);
+
+	if (address && !page)
+		addr = address;
+
+	if (address && page) {
+		addr = (u64)page_address(page);
+		if (address != addr) {
+			if (addr == 0) {
+				str += sprintf(str, "addr==0");
+				addr = address;
+			}
+		}
+	}
+	if (!virt_addr_valid(addr))
+		str += sprintf(str, "!addr");
+
+	if (pfn != 0 && page && pfn_valid(pfn)) {
+		if (pfn != page_to_pfn(page)) // Gosh!?
+			str += sprintf(str, "pfn!=pfn(%ld)", page_to_pfn(page));
+	}
+	if (pfn != 0 && addr != 0 && pfn_valid(pfn)) {
+		if (pfn != virt_to_pfn(addr))
+			str += sprintf(str,"pfn(addr)!=pfn");
+	}
+	if (!pfn_valid(pfn))
+		str += sprintf(str,"!pfn");
+
+	if (pfn_valid(pfn) && xen_initial_domain()) {
+		str += sprintf(str,"mfn:%ld->%lx",
+			pfn_to_mfn(pfn),
+			(unsigned long)mfn_to_virt(pfn_to_mfn(pfn)));
+	}
+	// Fixup, last attempt
+	if (!virt_addr_valid(addr) && pfn_valid(pfn)) {
+		str += sprintf(str,"(%lx)", addr); // old address.
+		addr = (u64)pfn_to_kaddr(pfn);
+	}
+	pte = lookup_address(addr, &level);
+	if (!pte) {
+		str += sprintf(str,"!pte(addr)");
+		goto print;
+	}
+	offset = addr & ~PAGE_MASK;
+
+	if (xen_domain()) {
+		phys = (pte_mfn(*pte) << PAGE_SHIFT) + offset;		
+		val = pte_val_ma(*pte);
+	} else {
+		phys = (pte_pfn(*pte) << PAGE_SHIFT) + offset;
+		val = pte_val(*pte);
+	}	
+	prot = pgprot_val(pte_pgprot(*pte));
+
+	if (!prot)
+		str += sprintf(str, "Not present.");
+	else  {
+		if (prot & _PAGE_USER)
+			str += sprintf(str, "USR ");
+		else
+			str += sprintf(str, "    ");
+		if (prot & _PAGE_RW)
+			str += sprintf(str, "RW ");
+		else
+			str += sprintf(str, "ro ");
+		if (prot & _PAGE_PWT)
+			str += sprintf(str, "PWT ");
+		else
+			str += sprintf(str, "    ");
+		if (prot & _PAGE_PCD)
+			str += sprintf(str, "PCD ");
+		else
+			str += sprintf(str, "    ");
+
+		/* Bit 9 has a different meaning on level 3 vs 4 */
+		if (level <= 3) {
+			if (prot & _PAGE_PSE)
+				str += sprintf(str, "PSE ");
+			else
+				str += sprintf(str, "    ");
+		} else {
+			if (prot & _PAGE_PAT)
+				str += sprintf(str, "pat ");
+			else
+				str += sprintf(str, "    ");
+		}
+		if (prot & _PAGE_GLOBAL)
+			str += sprintf(str, "GLB ");
+		else
+			str += sprintf(str, "    ");
+		if (prot & _PAGE_NX)
+			str += sprintf(str, "NX ");
+		else
+			str += sprintf(str, "x  ");
+#ifdef _PAGE_IOMEM
+		if (prot & _PAGE_IOMEM)
+			str += sprintf(str, "IO ");
+		else
+			str += sprintf(str, "   ");
+#endif
+		if (prot & _PAGE_SPECIAL)
+			str += sprintf(str, "SP ");
+	}
+
+print:
+	printk(KERN_INFO "[%16s]PFN: 0x%lx PTE: 0x%lx (val:%lx): [%s] [%s]\n",
+			what,
+			(unsigned long)pfn,
+			(pte) ? (unsigned long)(pte->pte) : 0,
+			(unsigned long)val,
+			buf,
+			level_name[level]);
+}
+
 static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
 	struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
@@ -81,7 +216,7 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	unsigned long page_last;
 	unsigned long pfn;
 	struct ttm_tt *ttm = NULL;
-	struct page *page;
+	struct page *page = NULL;
 	int ret;
 	int i;
 	bool is_iomem;
@@ -186,7 +321,9 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 			pfn = page_to_pfn(page);
 		}
 
+		print_pte("BEFORE",page, pfn, address);
 		ret = vm_insert_mixed(vma, address, pfn);
+		print_pte("AFTER",page, pfn, address);
 		/*
 		 * Somebody beat us to this PTE or prefaulting to
 		 * an already populated PTE, or prefaulting error.