linux-kernel - Re: [PATCH 7/7] KVM: MMU: cache guest page number to guest frame number

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Message-ID: <4D646517.8030702@cn.fujitsu.com>
Date:	Wed, 23 Feb 2011 09:38:31 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 7/7] KVM: MMU: cache guest page number to guest frame
 number

On 02/22/2011 10:32 PM, Avi Kivity wrote:
> On 02/22/2011 10:16 AM, Xiao Guangrong wrote:
>> Cache guest page number to guest frame number to avoid walk guest page table
>> frequently, the 'vtlb' idea is from Xen.
>>
>> Note:
>> we can't use vtlb in ept guests since the guest tlb invalid operation is not
>> intercept(reload CR3, invlpg), also can't used in L2 nnpt guest for the same
>> reason, but we can used it to cache L1's npt page table.
>>
> 
> I'm not so hot about introducing a new mechanism strictly for older hosts... EPT exists in three generations of Intel processors now (Sandy Bridge, Westmere, and Nehalem), and NPT is significantly older.
> 

Um...so, do we should stop the new features for softmmu, only bug fix is welcome? :-)
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