diff -uNr xen-unstable.hg-pristine/xen/arch/x86/hvm/platform.c xen-unstable.hg-p/xen/arch/x86/hvm/platform.c
--- xen-unstable.hg-pristine/xen/arch/x86/hvm/platform.c	2007-02-21 09:19:46.000000000 +0100
+++ xen-unstable.hg-p/xen/arch/x86/hvm/platform.c	2007-03-05 13:43:51.000000000 +0100
@@ -415,6 +415,17 @@
         GET_OP_SIZE_FOR_NONEBYTE(*op_size);
         return mem_reg(*op_size, opcode, mmio_op, rex);
 
+    case 0x08: /* or r8, m8 */	
+        mmio_op->instr = INSTR_OR;
+        *op_size = BYTE;
+        GET_OP_SIZE_FOR_BYTE(size_reg);
+        return reg_mem(size_reg, opcode, mmio_op, rex);
+
+    case 0x09: /* or r32/16, m32/16 */
+        mmio_op->instr = INSTR_OR;
+        GET_OP_SIZE_FOR_NONEBYTE(*op_size);
+        return reg_mem(*op_size, opcode, mmio_op, rex);
+
     case 0x0A: /* or m8, r8 */
         mmio_op->instr = INSTR_OR;
         *op_size = BYTE;