linux-kernel - Re: [PATCH v4 2/6] KVM: x86: introduce memslot_set_lpage

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Message-Id: <20130503111031.344825656c22e2c58f759cf1@gmail.com>
Date:	Fri, 3 May 2013 11:10:31 +0900
From:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc:	mtosatti@...hat.com, gleb@...hat.com, avi.kivity@...il.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v4 2/6] KVM: x86: introduce memslot_set_lpage_disallowed

On Sat, 27 Apr 2013 11:13:18 +0800
Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com> wrote:

> It is used to set disallowed large page on the specified level, can be
> used in later patch
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
> ---
>  arch/x86/kvm/x86.c |   53 ++++++++++++++++++++++++++++++++++-----------------
>  1 files changed, 35 insertions(+), 18 deletions(-)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 91dd9f4..52b4e97 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -6917,12 +6917,45 @@ void kvm_arch_free_memslot(struct kvm_memory_slot *free,
>  	}
>  }
>  
> +static void memslot_set_lpage_disallowed(struct kvm_memory_slot *slot,
> +					 unsigned long npages,
> +					 int lpage_size, int lpages)

What this function does is to disable large page support for this slot
as can be seen in the comment below.

Since setting lpage_info to something ("disallowed" ?) is an implementation
detail, we'd better hide such a thing from the function name.

Taking into account that we have "kvm_largepages_enabled()", something like
disable_largepages_memslot() may be a candidate.

But I want to see suggestions from others as well.

	Takuya
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