x86, msr: Add rd/wrmsr interfaces with preset registers

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native_{rdmsr,wrmsr}_safe_regs are two new interfaces which allow
presetting of a subset of eight x86 GPRs before executing the rd/wrmsr
instructions. This is needed at least on AMD K8 for accessing an erratum
workaround MSR.

Originally based on an idea by H. Peter Anvin.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
LKML-Reference: <1251705011-18636-1-git-send-email-petkovbb@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

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Borislav Petkov 2009-08-31 09:50:09 +02:00 • committed by H. Peter Anvin

parent 366d19e181

commit 132ec92f3f

5 changed files with 130 additions and 0 deletions

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13

arch/x86/include/asm/msr.h

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16

arch/x86/include/asm/paravirt.h

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2

arch/x86/kernel/paravirt.c

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1

arch/x86/lib/Makefile

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98

arch/x86/lib/msr-reg.S

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