x86: Export FPU API for KVM use

Also add some constants.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/include/asm/xsave.h b/arch/x86/include/asm/xsave.h
index 2c4390c..29ee4e4 100644
--- a/arch/x86/include/asm/xsave.h
+++ b/arch/x86/include/asm/xsave.h
@@ -13,6 +13,9 @@
 
 #define FXSAVE_SIZE	512
 
+#define XSTATE_YMM_SIZE 256
+#define XSTATE_YMM_OFFSET (512 + 64)
+
 /*
  * These are the features that the OS can handle currently.
  */