linux-kernel - Re: [PATCH 2/3] KVM: MMU: move bits lost judgement into a separate function

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Message-ID: <4C567694.2090808@redhat.com>
Date:	Mon, 02 Aug 2010 10:41:08 +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 list <kvm@...r.kernel.org>
Subject: Re: [PATCH 2/3] KVM: MMU: move bits lost judgement into a separate
 function

  On 07/27/2010 06:33 AM, Xiao Guangrong wrote:
> Introduce spte_bits_lost() function to judge whether spte bits will
> miss, it's more readable and can help us to cleanup code later
>
> Signed-off-by: Xiao Guangrong<xiaoguangrong@...fujitsu.com>
> ---
>   arch/x86/kvm/mmu.c |   20 +++++++++++++++++---
>   1 files changed, 17 insertions(+), 3 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index e10f2bd..dd6c192 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -303,6 +303,20 @@ static u64 __xchg_spte(u64 *sptep, u64 new_spte)
>   #endif
>   }
>
> +static bool spte_bits_lost(u64 spte)
> +{
> +	if (!shadow_accessed_mask)
> +		return false;
> +
> +	if (!is_shadow_present_pte(spte))
> +		return false;
> +
> +	if (spte&  shadow_accessed_mask)
> +		return false;
> +
> +	return true;
> +}

IMO spte_has_volatile_bits() is a clearer name, "lost" implies they are 
already gone.


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

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