From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
To: Avi Kivity <avi@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
LKML <linux-kernel@vger.kernel.org>, KVM <kvm@vger.kernel.org>
Subject: Re: [PATCH 7/7] KVM: MMU: cache guest page number to guest frame number
Date: Wed, 23 Feb 2011 09:38:31 +0800 [thread overview]
Message-ID: <4D646517.8030702@cn.fujitsu.com> (raw)
In-Reply-To: <4D63C8F9.1020708@redhat.com>
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? :-)
next prev parent reply other threads:[~2011-02-23 1:38 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-22 8:08 [PATCH 0/7] KVM: optimize memslots searching and cache GPN to GFN Xiao Guangrong
2011-02-22 8:09 ` [PATCH 1/7] KVM: cleanup memslot_id function Xiao Guangrong
2011-02-22 8:10 ` [PATCH 2/7] KVM: introduce KVM_MEM_SLOTS_NUM macro Xiao Guangrong
2011-02-22 8:11 ` [PATCH 1/3] KVM: introduce memslots_updated function Xiao Guangrong
2011-02-22 8:12 ` [PATCH 4/7] KVM: sort memslots and use binary search to search the right slot Xiao Guangrong
2011-02-22 14:25 ` Avi Kivity
2011-02-22 14:54 ` Alex Williamson
2011-02-22 18:54 ` [RFC PATCH 0/3] Weight-balanced binary tree + KVM growable memory slots using wbtree Alex Williamson
2011-02-22 18:55 ` [RFC PATCH 1/3] Weight-balanced tree Alex Williamson
2011-02-23 13:09 ` Avi Kivity
2011-02-23 17:02 ` Alex Williamson
2011-02-23 17:08 ` Avi Kivity
2011-02-23 20:19 ` Alex Williamson
2011-02-24 23:04 ` Andrew Morton
2011-02-22 18:55 ` [RFC PATCH 2/3] kvm: Allow memory slot array to grow on demand Alex Williamson
2011-02-24 10:39 ` Avi Kivity
2011-02-24 18:08 ` Alex Williamson
2011-02-27 9:44 ` Avi Kivity
2011-02-22 18:55 ` [RFC PATCH 3/3] kvm: Use weight-balanced tree for memory slot management Alex Williamson
2011-02-22 18:59 ` [RFC PATCH 0/3] Weight-balanced binary tree + KVM growable memory slots using wbtree Alex Williamson
2011-02-23 1:56 ` Alex Williamson
2011-02-23 13:12 ` Avi Kivity
2011-02-23 18:06 ` Alex Williamson
2011-02-23 19:28 ` Alex Williamson
2011-02-24 10:06 ` Avi Kivity
2011-02-24 17:35 ` Alex Williamson
2011-02-27 9:54 ` Avi Kivity
2011-02-28 23:04 ` Alex Williamson
2011-03-01 15:03 ` Avi Kivity
2011-03-01 18:20 ` Alex Williamson
2011-03-02 13:31 ` Avi Kivity
2011-03-01 19:47 ` Marcelo Tosatti
2011-03-02 13:34 ` Avi Kivity
2011-02-24 10:04 ` Avi Kivity
2011-02-23 1:30 ` [PATCH 4/7] KVM: sort memslots and use binary search to search the right slot Xiao Guangrong
2011-02-22 8:13 ` [PATCH 5/7] KVM: cache the last used slot Xiao Guangrong
2011-02-22 14:26 ` Avi Kivity
2011-02-22 8:15 ` [PATCH 6/7] KVM: cleanup traversal used slots Xiao Guangrong
2011-02-22 8:16 ` [PATCH 7/7] KVM: MMU: cache guest page number to guest frame number Xiao Guangrong
2011-02-22 14:32 ` Avi Kivity
2011-02-23 1:38 ` Xiao Guangrong [this message]
2011-02-23 9:28 ` Avi Kivity
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