linux-kernel - [tip:x86/fpu] x86/fpu/xstate: Fix xstate_offsets, xstate

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Date:	Sun, 10 Jul 2016 11:15:38 -0700
From:	tip-bot for Yu-cheng Yu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, bp@...en8.de, mingo@...nel.org,
	brgerst@...il.com, jpoimboe@...hat.com,
	dave.hansen@...ux.intel.com, fenghua.yu@...el.com,
	ravi.v.shankar@...el.com, dvlasenk@...hat.com, hpa@...or.com,
	dave.hansen@...el.com, sai.praneeth.prakhya@...el.com,
	yu-cheng.yu@...el.com, torvalds@...ux-foundation.org,
	oleg@...hat.com, peterz@...radead.org, luto@...nel.org,
	tglx@...utronix.de, quentin.casasnovas@...cle.com
Subject: [tip:x86/fpu] x86/fpu/xstate: Fix xstate_offsets, xstate_sizes for
 non-extended xstates

Commit-ID:  ac73b27aea4eacdd7555f664d5fc6e1d4d1c8bf6
Gitweb:     http://git.kernel.org/tip/ac73b27aea4eacdd7555f664d5fc6e1d4d1c8bf6
Author:     Yu-cheng Yu <yu-cheng.yu@...el.com>
AuthorDate: Fri, 17 Jun 2016 13:07:19 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 10 Jul 2016 17:12:11 +0200

x86/fpu/xstate: Fix xstate_offsets, xstate_sizes for non-extended xstates

The arrays xstate_offsets[] and xstate_sizes[] record XSAVE standard-
format offsets and sizes. Values for non-extended state components
fpu and xmm's were not initialized or used. Ptrace format conversion
needs them. Fix it.

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
Reviewed-by: Dave Hansen <dave.hansen@...el.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Quentin Casasnovas <quentin.casasnovas@...cle.com>
Cc: Ravi V. Shankar <ravi.v.shankar@...el.com>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/cf3ea36cf30e2a99e37da6483e65446d018ff0a7.1466179491.git.yu-cheng.yu@intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/fpu/xstate.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 09bac97..f8d1aff 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -246,6 +246,15 @@ static void __init setup_xstate_features(void)
 	/* start at the beginnning of the "extended state" */
 	unsigned int last_good_offset = offsetof(struct xregs_state,
 						 extended_state_area);
+	/*
+	 * The FP xstates and SSE xstates are legacy states. They are always
+	 * in the fixed offsets in the xsave area in either compacted form
+	 * or standard form.
+	 */
+	xstate_offsets[0] = 0;
+	xstate_sizes[0] = offsetof(struct fxregs_state, xmm_space);
+	xstate_offsets[1] = xstate_sizes[0];
+	xstate_sizes[1] = FIELD_SIZEOF(struct fxregs_state, xmm_space);
 
 	for (i = FIRST_EXTENDED_XFEATURE; i < XFEATURE_MAX; i++) {
 		if (!xfeature_enabled(i))