diff -r 54678a99e102 xen/arch/x86/hvm/svm/svm.c
--- a/xen/arch/x86/hvm/svm/svm.c	Wed Jan 31 12:23:35 2007 +0000
+++ b/xen/arch/x86/hvm/svm/svm.c	Wed Jan 31 16:52:42 2007 -0600
@@ -1189,6 +1189,8 @@ static void svm_vmexit_do_cpuid(struct v
         /* So far, we do not support 3DNow for the guest. */
         clear_bit(X86_FEATURE_3DNOW & 31, &edx);
         clear_bit(X86_FEATURE_3DNOWEXT & 31, &edx);
+        /* no FFXSR instructions feature. */
+        clear_bit(X86_FEATURE_FFXSR & 31, &edx);
     }
     else if ( input == 0x80000007 || input == 0x8000000A )
     {
diff -r 54678a99e102 xen/include/asm-x86/cpufeature.h
--- a/xen/include/asm-x86/cpufeature.h	Wed Jan 31 12:23:35 2007 +0000
+++ b/xen/include/asm-x86/cpufeature.h	Wed Jan 31 16:52:21 2007 -0600
@@ -92,6 +92,7 @@
 #define X86_FEATURE_LAHF_LM	(6*32+ 0) /* LAHF/SAHF in long mode */
 #define X86_FEATURE_CMP_LEGACY	(6*32+ 1) /* If yes HyperThreading not valid */
 #define X86_FEATURE_SVME        (6*32+ 2) /* Secure Virtual Machine */
+#define X86_FEATURE_FFXSR       (6*32+25) /* FFXSR instruction optimizations */
 
 #define cpu_has(c, bit)		test_bit(bit, (c)->x86_capability)
 #define boot_cpu_has(bit)	test_bit(bit, boot_cpu_data.x86_capability)