linux-kernel - Re: [PATCH v2 05/16] KVM: MMU: abstract spte write-protect

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Date:	Sat, 14 Apr 2012 11:26:35 +0900
From:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 05/16] KVM: MMU: abstract spte write-protect

On Fri, 13 Apr 2012 18:11:45 +0800
Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com> wrote:

> +/* Return true if the spte is dropped. */

Return value does not correspond with the function name so it is confusing.

People may think that true means write protection has been done.

> +static bool spte_write_protect(struct kvm *kvm, u64 *sptep, bool large,
> +			       bool *flush)
> +{
> +	u64 spte = *sptep;
> +
> +	if (!is_writable_pte(spte))
> +		return false;
> +
> +	*flush |= true;
> +
> +	if (large) {
> +		pgprintk("rmap_write_protect(large): spte %p %llx\n",
> +			 spte, *spte);
> +		BUG_ON(!is_large_pte(spte));
> +
> +		drop_spte(kvm, sptep);
> +		--kvm->stat.lpages;
> +		return true;
> +	}

This suggests we should use separate functions?

	Takuya
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