#define FXSAVE_SIZE 512
+#define XSAVE_HDR_SIZE 64
+#define XSAVE_HDR_OFFSET FXSAVE_SIZE
+
+#define XSAVE_YMM_SIZE 256
+#define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET)
+
/*
* These are the features that the OS can handle currently.
*/
static inline int xsave_user(struct xsave_struct __user *buf)
{
int err;
+
+ /*
+ * Clear the xsave header first, so that reserved fields are
+ * initialized to zero.
+ */
+ err = __clear_user(&buf->xsave_hdr,
+ sizeof(struct xsave_hdr_struct));
+ if (unlikely(err))
+ return -EFAULT;
+
__asm__ __volatile__("1: .byte " REX_PREFIX "0x0f,0xae,0x27\n"
"2:\n"
".section .fixup,\"ax\"\n"