linux-kernel - Re: [PATCH 3/4] KVM: MMU: track dirty page in speculative path properly

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Message-ID: <20100713220551.GB6370@amt.cnet>
Date:	Tue, 13 Jul 2010 19:05:51 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>
Subject: Re: [PATCH 3/4] KVM: MMU: track dirty page in speculative path
 properly

On Tue, Jul 13, 2010 at 05:45:27PM +0800, Xiao Guangrong wrote:
> In speculative path, the page is not real write-access, no need mark it
> dirty, so clear dirty bit in this path and later examine this bit when
> we release the page
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> ---
>  arch/x86/kvm/mmu.c |   24 +++++++++++-------------
>  1 files changed, 11 insertions(+), 13 deletions(-)

Unfortunately all pages that kvm creates translations for are marked
dirty due to get_user_pages(w=1), except KSM which makes them read-only
later.


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