linux-kernel - Re: [PATCH] KVM MMU: check reserved bits only if CR4.PSE=1 or CR4.PAE=1

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Message-ID: <4B9F2204.7050302@redhat.com>
Date:	Tue, 16 Mar 2010 08:15:32 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Sheng Yang <sheng@...ux.intel.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM MMU: check reserved bits only if CR4.PSE=1 or CR4.PAE=1

On 03/16/2010 08:03 AM, Xiao Guangrong wrote:
>
>> I think the only change is that is !is_pse(vcpu) we ignore bit 7?
>>      
> If the vcpu is in PT32E_ROOT_LEVEL/PT64_ROOT_LEVEL mode, CR4.PAE
> is aways enabled, so what we need do is ignore bit7 if !is_pse(vcpu)
> under PT32_ROOT_LEVEL mode, right?
>    

I think PAE will fault if bit7 is set and !is_pse(vcpu), but not sure.

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

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