linux-kernel - [PATCH 201/208] x86/fpu: Clean up xstate feature reservation

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Date:	Tue,  5 May 2015 19:58:25 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	linux-kernel@...r.kernel.org
Cc:	Andy Lutomirski <luto@...capital.net>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 201/208] x86/fpu: Clean up xstate feature reservation

Put MPX support into its separate high level structure, and
also replace the fixed YMM, LWP and MPX structures in
xregs_state with just reservations - their exact offsets
in the structure will depend on the CPU and no code actually
relies on those fields.

No change in functionality.

Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/fpu/types.h | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/fpu/types.h b/arch/x86/include/asm/fpu/types.h
index 4c4eceb08a42..02241c2a10e9 100644
--- a/arch/x86/include/asm/fpu/types.h
+++ b/arch/x86/include/asm/fpu/types.h
@@ -145,12 +145,21 @@ struct bndcsr {
 	u64				bndstatus;
 } __packed;
 
+struct mpx_struct {
+	struct bndreg			bndreg[4];
+	struct bndcsr			bndcsr;
+};
+
 struct xstate_header {
 	u64				xfeatures;
 	u64				xcomp_bv;
 	u64				reserved[6];
 } __attribute__((packed));
 
+/* New processor state extensions should be added here: */
+#define XSTATE_RESERVE			(sizeof(struct ymmh_struct) + \
+					 sizeof(struct lwp_struct)  + \
+					 sizeof(struct mpx_struct)  )
 /*
  * This is our most modern FPU state format, as saved by the XSAVE
  * and restored by the XRSTOR instructions.
@@ -162,11 +171,7 @@ struct xstate_header {
 struct xregs_state {
 	struct fxregs_state		i387;
 	struct xstate_header		header;
-	struct ymmh_struct		ymmh;
-	struct lwp_struct		lwp;
-	struct bndreg			bndreg[4];
-	struct bndcsr			bndcsr;
-	/* New processor state extensions will go here. */
+	u8				__reserved[XSTATE_RESERVE];
 } __attribute__ ((packed, aligned (64)));
 
 /*
-- 
2.1.0

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