x86/fpu: Make XSAVE check the base CPUID features before enabling

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Before enabling XSAVE, not only check the XSAVE specific CPUID bits,
but also the base CPUID features of the respective XSAVE feature.
This allows to disable individual XSAVE states using the existing
clearcpuid= option, which can be useful for performance testing
and debugging, and also in general avoids inconsistencies.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20171013215645.23166-5-andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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Andi Kleen 2017-10-13 14:56:44 -07:00 • committed by Ingo Molnar

parent 0c2a3913d6

commit ccb18db2ab

1 changed files with 23 additions and 0 deletions

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arch/x86/kernel/fpu/xstate.c

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