linux-kernel - [PATCH 0/4] x86/fpu: FPU init code bugfixes

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Date:	Wed,  6 Jan 2016 14:24:50 -0800
From:	yu-cheng yu <yu-cheng.yu@...el.com>
To:	linux-kernel@...r.kernel.org
Cc:	yu-cheng yu <yu-cheng.yu@...el.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...e.de>,
	Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>,
	"Ravi V. Shankar" <ravi.v.shankar@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH 0/4] x86/fpu: FPU init code bugfixes

The function fpu__init_system() is executed before parse_early_param().
This causes wrong fpu configuration. In addition, there are three related
issues:

  1. XGETBV1 is enabled when noxsave is given
  2. MPX is enabled when eagerfpu=off is given
  3. AVX is enabled when eagerfpu=off is given

  Issues 1 and 3 are existing bugs. Issue 2 is a fallout from the
  command-line parsing move.

The following four patches fix these issues.

yu-cheng yu (4):
  x86/fpu: Fix early fpu command-line parsing.
  x86/fpu: Disable XGETBV1 when no XSAVE.
  x86/fpu: Disable MPX when eagerfpu is off.
  x86/fpu: Disable AVX when eagerfpu is off.

 arch/x86/include/asm/fpu/internal.h |   1 +
 arch/x86/include/asm/fpu/xstate.h   |  11 +--
 arch/x86/kernel/fpu/init.c          | 161 +++++++++++++++++++-----------------
 arch/x86/kernel/fpu/xstate.c        |   4 +-
 4 files changed, 92 insertions(+), 85 deletions(-)

Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
Cc: x86@...nel.org
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
Cc: Ravi V. Shankar <ravi.v.shankar@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
-- 
1.9.1

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