linux-kernel - Re: [PATCH v3 06/11] KVM: MMU: cleanup FNAME(invlpg)

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Date:	Tue, 13 Sep 2011 14:00:04 +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 v3 06/11] KVM: MMU: cleanup FNAME(invlpg)

On 08/30/2011 05:36 AM, Xiao Guangrong wrote:
> Directly Use mmu_page_zap_pte to zap spte in FNAME(invlpg), also remove the
> same code between FNAME(invlpg) and FNAME(sync_page)
>
>
> +static gpa_t FNAME(get_first_pte_gpa)(struct kvm_mmu_page *sp)

spte

> +{
> +	int offset = 0;
> +
> +	if (PTTYPE == 32)
> +		offset = sp->role.quadrant<<  PT64_LEVEL_BITS;
> +
> +	return gfn_to_gpa(sp->gfn) + offset * sizeof(pt_element_t);
> +}

Only works for L1 tables, yes?  Need a comment so it isn't reused for L2.

> @@ -663,7 +673,6 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
>   	gpa_t pte_gpa = -1;
>   	int level;
>   	u64 *sptep;
> -	int need_flush = 0;
>
>   	vcpu_clear_mmio_info(vcpu, gva);
>
> @@ -675,36 +684,20 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
>
>   		sp = page_header(__pa(sptep));
>   		if (is_last_spte(*sptep, level)) {
> -			int offset, shift;
> -
>   			if (!sp->unsync)
>   				break;
>
> -			shift = PAGE_SHIFT -
> -				  (PT_LEVEL_BITS - PT64_LEVEL_BITS) * level;
> -			offset = sp->role.quadrant<<  shift;
> -
> -			pte_gpa = (sp->gfn<<  PAGE_SHIFT) + offset;
> +			pte_gpa = FNAME(get_first_pte_gpa)(sp);


Here is can be used for L2 - I think we can use 2MB host pages to back 
4MB guest mappings.



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

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