From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH 4/6] Implement Hyper-V MSRs
Date: Sun, 17 May 2009 23:00:13 +0300
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Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"joerg.roedel@amd.com" <joerg.roedel@amd.com>
To: Alexander Graf <agraf@suse.de>
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Alexander Graf wrote:
>>>    case MSR_VM_CR:
>>> +    case 0x40000081:
>>>        *data = 0;
>>>        break;
>>>
>>
>> This probably is a Hyper-V MSR, but I don't see how it expects it to 
>> be present in real hardware.  Are you sure this is really needed?
>
> Well hyper-v just crashes/reboots if it get a #gp on that msr, so I 
> suppose yes.

This is suspicious.  It won't get this MSR on real hardware.

Maybe this was with cpuid.hypervisor enabled?

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.