[PATCH 3/6] selftests/x86/xstate: Validate XSTATE_BV in ptrace test

["Chang S. Bae" <chang.seok.bae@intel.com>]

The ptrace test does not currently validate XSTATE_BV in the XSAVE
header. Add a check for it.

The component bit may legitimately be clear when testing a reset state.
So, ensure the expected bit setting first and then compare the component
bit directly.

Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
---
 tools/testing/selftests/x86/xstate.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/testing/selftests/x86/xstate.c b/tools/testing/selftests/x86/xstate.c
index 240567e79e96..93ba4b5f1a08 100644
--- a/tools/testing/selftests/x86/xstate.c
+++ b/tools/testing/selftests/x86/xstate.c
@@ -62,6 +62,7 @@ static inline void load_init_xstate(struct xstate_info *xstate, struct xsave_buf
 
 static inline void copy_xstate(struct xsave_buffer *xbuf_dst, struct xsave_buffer *xbuf_src)
 {
+	memcpy(xbuf_dst->header, xbuf_src->header, XSAVE_HDR_SIZE);
 	memcpy(&xbuf_dst->bytes[xstate.xbuf_offset],
 	       &xbuf_src->bytes[xstate.xbuf_offset],
 	       xstate.size);
@@ -277,6 +278,13 @@ static bool validate_ptracer_xstate(pid_t target, struct iovec iov,
 		failed++;
 	}
 
+	if ((xstate.mask & get_xstatebv(xbuf)) == (xstate.mask & get_xstatebv(expected))) {
+		printf("#\tok\tXSTATE_BV\n");
+	} else {
+		printf("#\tnot ok\tXSTATE_BV\n");
+		failed++;
+	}
+
 	if (validate_xstate_same(xbuf, expected)) {
 		printf("#\tok\txstate area\n");
 	} else {
-- 
2.53.0