xen/x86: re-enable xsave by default
now that it supports live migration. 

Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>

diff -r 3539ef956a37 xen/arch/x86/cpu/common.c
--- a/xen/arch/x86/cpu/common.c	Mon Apr 18 18:34:45 2011 +0100
+++ b/xen/arch/x86/cpu/common.c	Wed Apr 20 10:18:56 2011 +0100
@@ -18,7 +18,7 @@
 static int cachesize_override __cpuinitdata = -1;
 size_param("cachesize", cachesize_override);
 
-static bool_t __cpuinitdata use_xsave;
+static bool_t __cpuinitdata use_xsave = 1;
 boolean_param("xsave", use_xsave);
 unsigned int __devinitdata opt_cpuid_mask_ecx = ~0u;
 integer_param("cpuid_mask_ecx", opt_cpuid_mask_ecx);