Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1303109

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

Show all headers | View raw

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@intel.com>
Cc: x86@kernel.org
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH 0/4] x86/fpu: FPU init code bugfixes yu-cheng yu <yu-cheng.yu@intel.com> - 2016-01-06 23:40 +0100
  [PATCH 2/4] x86/fpu: Disable XGETBV1 when no XSAVE yu-cheng yu <yu-cheng.yu@intel.com> - 2016-01-06 23:40 +0100
    [tip:x86/asm] x86/fpu: Disable XGETBV1 when no XSAVE tip-bot for yu-cheng yu <tipbot@zytor.com> - 2016-01-12 13:10 +0100
  [PATCH 3/4] x86/fpu: Disable MPX when eagerfpu is off yu-cheng yu <yu-cheng.yu@intel.com> - 2016-01-06 23:40 +0100
    [tip:x86/asm] x86/fpu: Disable MPX when eagerfpu is off tip-bot for yu-cheng yu <tipbot@zytor.com> - 2016-01-12 13:10 +0100
  [PATCH 4/4] x86/fpu: Disable AVX when eagerfpu is off yu-cheng yu <yu-cheng.yu@intel.com> - 2016-01-06 23:40 +0100
    [tip:x86/asm] x86/fpu: Disable AVX when eagerfpu is off tip-bot for yu-cheng yu <tipbot@zytor.com> - 2016-01-12 13:10 +0100
  [PATCH 1/4] x86/fpu: Fix early fpu command-line parsing yu-cheng yu <yu-cheng.yu@intel.com> - 2016-01-06 23:40 +0100
    [tip:x86/asm] x86/fpu: Fix early FPU command-line parsing tip-bot for yu-cheng yu <tipbot@zytor.com> - 2016-01-12 13:10 +0100

csiph-web