linux-kernel - Re: [PATCH 09/13] KVM: MMU: get expected spte out of mmu-lock

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Message-Id: <20120409221630.8c94f31ef68d4a89941a3413@gmail.com>
Date:	Mon, 9 Apr 2012 22:16:30 +0900
From:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Xiao Guangrong <xiaoguangrong.eric@...il.com>,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 09/13] KVM: MMU: get expected spte out of mmu-lock

On Mon, 09 Apr 2012 15:28:47 +0300
Avi Kivity <avi@...hat.com> wrote:

> Ah, so it's protecting two paths at the same time: rmap.write_protect ->
> fast page fault, and lock(sptep) -> write protect.
> 
> The whole thing needs to be documented very carefully in locking.txt,
> otherwise mmu.c will be write-protected to everyone except you.

Before changing mmu_lock usage, better describe it in locking.txt.

I guess from mmu.c git history, it is already restricted to a few
people who can describe that.

	Takuya
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