linux-kernel - Re: Access MSR functions in userspace?

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Message-ID: <47A94CB8.3020303@zytor.com>
Date:	Tue, 05 Feb 2008 21:59:20 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Maxim Levitsky <maximlevitsky@...il.com>
CC:	hasan@...italpath.net, linux-kernel@...r.kernel.org
Subject: Re: Access MSR functions in userspace?

Maxim Levitsky wrote:
> On Wednesday, 6 February 2008 05:29:47 Hasan Rashid wrote:
>> Is there a way to use RDMSR and WRMSR in userspace? I only need to write
>> to one register, writing a module with a userspace piece to handle that
>> seems like an over kill.
>>
>> TIA!
> 
> 
> Fortunately linux have /dev/cpu/*/msr
> Take  look at $LINUX_SOURCES/arch/x86/kernel/msr.c to learn how to use it.
> 

You might also find these useful:

http://www.kernel.org/pub/linux/utils/cpu/msr-tools/msr-tools-1.1.2.tar.bz2

	-hpa
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