x86/xsaves: Detect xsaves/xrstors feature

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Detect the xsaveopt, xsavec, xgetbv, and xsaves features in processor extended
state enumberation sub-leaf (eax=0x0d, ecx=1):
Bit 00: XSAVEOPT is available
Bit 01: Supports XSAVEC and the compacted form of XRSTOR if set
Bit 02: Supports XGETBV with ECX = 1 if set
Bit 03: Supports XSAVES/XRSTORS and IA32_XSS if set

The above features are defined in the new word 10 in cpu features.

The IA32_XSS MSR (index DA0H) contains a state-component bitmap that specifies
the state components that software has enabled xsaves and xrstors to manage.
If the bit corresponding to a state component is clear in XCR0 | IA32_XSS,
xsaves and xrstors will not operate on that state component, regardless of
the value of the instruction mask.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1401387164-43416-3-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

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Fenghua Yu 2014-05-29 11:12:30 -07:00 • committed by H. Peter Anvin

parent 446fd806f5

commit 6229ad278c

4 changed files with 19 additions and 3 deletions

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10

arch/x86/include/asm/cpufeature.h

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2

arch/x86/include/uapi/asm/msr-index.h

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9

arch/x86/kernel/cpu/common.c

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1

arch/x86/kernel/cpu/scattered.c

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