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Re: [Xen-devel] linux' X86_MSR config option

To: "Keir Fraser" <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] linux' X86_MSR config option
From: "Jan Beulich" <jbeulich@xxxxxxxxxx>
Date: Wed, 30 May 2007 12:03:17 +0200
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>>> Keir Fraser <keir@xxxxxxxxxxxxx> 30.05.07 11:53 >>>
>On 30/5/07 10:52, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:
>> .. is out of sync on i386 and x86-64 - should it be allowed on i386, or 
>> should
>> it be suppressed on x86-64? Since Xen fails ill accesses, I would assume
>> enabling it on i386 is fine.
>Is this the MSRs-from-userland option? Should be safe to enable.


>But probably fairly pointless?

Not so for debugging purposes - I asked because I just now needed it to read
a BIOS-initialized MSR, and it's quite handy if you don't have to reboot into a
native kernel to do just this.


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