linux-kernel - Re: [PATCH] rdmsr_on_cpu, wrmsr_on

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Date:	Fri, 19 Jan 2007 10:21:16 +1100
From:	Andi Kleen <ak@...e.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Alexey Dobriyan <adobriyan@...nvz.org>, akpm@...l.org,
	linux-kernel@...r.kernel.org, davej@...emonkey.org.uk,
	devel@...r.kernel.org
Subject: Re: [PATCH] rdmsr_on_cpu, wrmsr_on_cpu


> HOWEVER -- and this is where things get gnarly -- the CPUID and MSR
> drivers would really like to be able to execute CPUID, WRMSR and RDMSR
> with the entire GPR register set (except the stack pointer) pre-set and
> post-captured, since it's highly likely that there are going to be
> nonstandard MSRs and CPUID levels (already witness Intel breaking the
> CPUID architecture by introducing %ecx dependencies.)

That looks like such a specialized requirement that I would suggest 
you keep that in the drivers. The interface for most users would be just
too ugly

-Andi

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