linux-kernel - Re: [PATCH v2 4/5] KVM: MMU: introduce page_fault_start and page_fault

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Message-ID: <20120915152512.GB3037@amt.cnet>
Date:	Sat, 15 Sep 2012 12:25:12 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc:	Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 4/5] KVM: MMU: introduce page_fault_start and
 page_fault_end

On Fri, Sep 14, 2012 at 05:59:06PM +0800, Xiao Guangrong wrote:
> Wrap the common operations into these two functions
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>

Why? I think people are used to 

spin_lock(lock)
sequence
spin_unlock(lock)

So its easy to verify whether access to data structures are protected.

Unrelated to this patch, one opportunity i see to simplify this
code is:

- error pfn / mmio pfn / invalid pfn relation

Have the meaning of this bits unified in a single function/helper, see
comment to patch 1 (perhaps you can further improve).

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