linux-kernel - Re: [PATCH v2 10/16] KVM: MMU: fask check whether page is writable

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Message-ID: <4F8CE9CF.6050506@linux.vnet.ibm.com>
Date:	Tue, 17 Apr 2012 11:55:59 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.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 v2 10/16] KVM: MMU: fask check whether page is writable

On 04/16/2012 07:47 PM, Avi Kivity wrote:

> On 04/16/2012 01:20 PM, Xiao Guangrong wrote:
>>>>
>>>> It is used to avoid the unnecessary overload 
>>>
>>> It's overloading me :(
>>>
>>
>>
>> Sorry.
>>
> 
> The trick is to send those in separate patchset so the maintainer
> doesn't notice.
> 

Thanks for your suggestion, i will pay more attention on it in the
further.

For this patch, what did you mean of "those"? You mean the whole
rmap.PTE_LIST_WP_BIT (fast check for shadow page table write protection
and host write protection) or just about host_page_write_protect
(for KSM only)?

If we do not have rmap.PTE_LIST_WP_BIT, there may have regression on
shadow mmu.

Hmm, do i need implement rmap.PTE_LIST_WP_BIT, then fast page fault?

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