Messages in this thread | | | From | yu-cheng yu <> | Subject | [PATCH 0/4] x86/fpu: FPU init code bugfixes | Date | Wed, 6 Jan 2016 14:24:50 -0800 |
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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
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