tree f8e3f3ab5541f583030b0bcd5f3f81ca338f77a2
parent 366d19e181be873c70f4aafca3931d77d781ccd7
author Borislav Petkov <petkovbb@googlemail.com> 1251705009 +0200
committer H. Peter Anvin <hpa@zytor.com> 1251756866 -0700

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

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>