linux-kernel - [tip:x86/urgent] x86/fpu: Disable dependent CPU features on " noxsave"

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Date:	Tue, 21 Jul 2015 02:38:17 -0700
From:	tip-bot for Jan Beulich <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	jbeulich@...e.com, hpa@...or.com, JBeulich@...e.com,
	mingo@...nel.org, tglx@...utronix.de, dave.hansen@...ux.intel.com,
	peterz@...radead.org
Subject: [tip:x86/urgent] x86/fpu: Disable dependent CPU features on "
 noxsave"

Commit-ID:  5bc016f1abaa1c5ac0e3af23aa79faec4634a074
Gitweb:     http://git.kernel.org/tip/5bc016f1abaa1c5ac0e3af23aa79faec4634a074
Author:     Jan Beulich <JBeulich@...e.com>
AuthorDate: Mon, 20 Jul 2015 08:49:01 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 21 Jul 2015 08:20:42 +0200

x86/fpu: Disable dependent CPU features on "noxsave"

Complete the set of dependent features that need disabling at
once: XSAVEC, AVX-512 and all currently known to the kernel
extensions to it, as well as MPX need to be disabled too.

Signed-off-by: Jan Beulich <jbeulich@...e.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/55ACC40D0200007800092E6C@mail.emea.novell.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/fpu/init.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kernel/fpu/init.c b/arch/x86/kernel/fpu/init.c
index 0b39173..1e173f6 100644
--- a/arch/x86/kernel/fpu/init.c
+++ b/arch/x86/kernel/fpu/init.c
@@ -351,9 +351,15 @@ static int __init x86_noxsave_setup(char *s)
 
 	setup_clear_cpu_cap(X86_FEATURE_XSAVE);
 	setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT);
+	setup_clear_cpu_cap(X86_FEATURE_XSAVEC);
 	setup_clear_cpu_cap(X86_FEATURE_XSAVES);
 	setup_clear_cpu_cap(X86_FEATURE_AVX);
 	setup_clear_cpu_cap(X86_FEATURE_AVX2);
+	setup_clear_cpu_cap(X86_FEATURE_AVX512F);
+	setup_clear_cpu_cap(X86_FEATURE_AVX512PF);
+	setup_clear_cpu_cap(X86_FEATURE_AVX512ER);
+	setup_clear_cpu_cap(X86_FEATURE_AVX512CD);
+	setup_clear_cpu_cap(X86_FEATURE_MPX);
 
 	return 1;
 }
--
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