linux-kernel - Re: [PATCH 08/13] KVM: MMU: fask check whether page is writable

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Message-ID: <4F87FF6C.1080403@linux.vnet.ibm.com>
Date:	Fri, 13 Apr 2012 18:26:52 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Xiao Guangrong <xiaoguangrong.eric@...il.com>,
	Avi Kivity <avi@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 08/13] KVM: MMU: fask check whether page is writable

On 04/13/2012 07:08 AM, Marcelo Tosatti wrote:


>> Yes, it is used as a cache for mmu_need_write_protect.
>>
>> When the gfn is protected by sync sp or read-only host page we set this bit,
>> and it is be cleared when the sp become unsync or host page becomes writable.
> 
> Wouldnt dropping support for shadow entirely make it much simpler? 
> 
> The idea to handle RO->RW without mmu_lock is very neat, but the
> complexity with shadow is horrible.
> 


I have posted the v2 that is fairly simple, please review that one. :)
Thank you, Marcelo!

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