linux-kernel - Re: [PATCH] Add MCE support to KVM

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Message-ID: <49EC565B.2090806@redhat.com>
Date:	Mon, 20 Apr 2009 14:02:51 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Gerd Hoffmann <kraxel@...hat.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Huang Ying <ying.huang@...el.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Add MCE support to KVM

Andi Kleen wrote:
>> It depends if the MSR may be considered global, or is required to be 
>> per-cpu.  Need to refresh my memory on this, but I remember reading this 
>>     
>
> Machine Check MSRs need to be per CPU. The latest kernels have some support
> for "shared banks" (between CPUs) but it's better to not have it and
> older OS don't like it.
>   

In the case of the hypercall page MSR, it is global and shared among all 
processors.

-- 
error compiling committee.c: too many arguments to function

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