diff -r 587e81dd3540 xen/arch/x86/hvm/emulate.c
--- a/xen/arch/x86/hvm/emulate.c	Mon Mar 02 14:19:35 2009 +0000
+++ b/xen/arch/x86/hvm/emulate.c	Sun Mar 11 19:16:16 2009 +0100
@@ -763,7 +763,7 @@ static int hvmemul_read_msr(
     if ( (rc = hvm_msr_read_intercept(&_regs)) != 0 )
         return rc;
 
-    *val = ((uint64_t)(uint32_t)_regs.edx << 32) || (uint32_t)_regs.eax;
+    *val = ((uint64_t)_regs.edx << 32) | (uint64_t)_regs.eax;
     return X86EMUL_OKAY;
 }