linux-kernel - Re: [PATCH 1/7] KVM: MMU: optimize pte write path if don't have protected sp

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Message-ID: <4DCF9105.4020000@redhat.com>
Date:	Sun, 15 May 2011 11:38:29 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 1/7] KVM: MMU: optimize pte write path if don't have protected
 sp

On 05/15/2011 11:33 AM, Xiao Guangrong wrote:
> >
> >  These atomic ops are always called from within the spinlock, so we don't need an atomic_t here.
> >
> >  Sorry, I should have noticed this on the first version.
>
> We read indirect_shadow_pages atomically on pte write path, that is allowed out of mmu_lock

Reading is fine:

   #define atomic_read(v)    (*(volatile int *)&(v)->counter)

-- 
error compiling committee.c: too many arguments to function

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