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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>
This commit is contained in:
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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arch/x86/kernel/paravirt.c
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@@ -362,8 +362,10 @@ struct pv_cpu_ops pv_cpu_ops = {
#endif
.wbinvd = native_wbinvd,
.read_msr = native_read_msr_safe,
.rdmsr_regs = native_rdmsr_safe_regs,
.read_msr_amd = native_read_msr_amd_safe,
.write_msr = native_write_msr_safe,
.wrmsr_regs = native_wrmsr_safe_regs,
.read_tsc = native_read_tsc,
.read_pmc = native_read_pmc,
.read_tscp = native_read_tscp,