linux-kernel - Re: [PATCH v2 5/6] KVM: MMU: remove 'clear

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Date:	Wed, 17 Nov 2010 14:49:03 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 5/6] KVM: MMU: remove 'clear_unsync' parameter

On Wed, Nov 17, 2010 at 12:13:17PM +0800, Xiao Guangrong wrote:
> Remove it since we can jude it by sp->unsync
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> ---
>  arch/x86/include/asm/kvm_host.h |    2 +-
>  arch/x86/kvm/mmu.c              |    8 ++++----
>  arch/x86/kvm/paging_tmpl.h      |    5 ++---
>  3 files changed, 7 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index b04c0fa..ce8c1e4 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -250,7 +250,7 @@ struct kvm_mmu {
>  	void (*prefetch_page)(struct kvm_vcpu *vcpu,
>  			      struct kvm_mmu_page *page);
>  	int (*sync_page)(struct kvm_vcpu *vcpu,
> -			 struct kvm_mmu_page *sp, bool clear_unsync);
> +			 struct kvm_mmu_page *sp);
>  	void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva);
>  	hpa_t root_hpa;
>  	int root_level;
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index c4531a3..0668f4b 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -1162,7 +1162,7 @@ static void nonpaging_prefetch_page(struct kvm_vcpu *vcpu,
>  }
>  
>  static int nonpaging_sync_page(struct kvm_vcpu *vcpu,
> -			       struct kvm_mmu_page *sp, bool clear_unsync)
> +			       struct kvm_mmu_page *sp)
>  {
>  	return 1;
>  }
> @@ -1292,7 +1292,7 @@ static int __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
>  	if (clear_unsync)
>  		kvm_unlink_unsync_page(vcpu->kvm, sp);
>  
> -	if (vcpu->arch.mmu.sync_page(vcpu, sp, clear_unsync)) {
> +	if (vcpu->arch.mmu.sync_page(vcpu, sp)) {
>  		kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list);
>  		return 1;
>  	}
> @@ -1333,12 +1333,12 @@ static void kvm_sync_pages(struct kvm_vcpu *vcpu,  gfn_t gfn)
>  			continue;
>  
>  		WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL);
> +		kvm_unlink_unsync_page(vcpu->kvm, s);
>  		if ((s->role.cr4_pae != !!is_pae(vcpu)) ||
> -			(vcpu->arch.mmu.sync_page(vcpu, s, true))) {
> +			(vcpu->arch.mmu.sync_page(vcpu, s))) {
>  			kvm_mmu_prepare_zap_page(vcpu->kvm, s, &invalid_list);
>  			continue;
>  		}
> -		kvm_unlink_unsync_page(vcpu->kvm, s);
>  		flush = true;
>  	}
>  
> diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
> index 57619ed..60f00db 100644
> --- a/arch/x86/kvm/paging_tmpl.h
> +++ b/arch/x86/kvm/paging_tmpl.h
> @@ -740,8 +740,7 @@ static void FNAME(prefetch_page)(struct kvm_vcpu *vcpu,
>   * - The spte has a reference to the struct page, so the pfn for a given gfn
>   *   can't change unless all sptes pointing to it are nuked first.
>   */
> -static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
> -			    bool clear_unsync)
> +static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
>  {
>  	int i, offset, nr_present;
>  	bool host_writable;
> @@ -781,7 +780,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
>  			u64 nonpresent;
>  
>  			if (rsvd_bits_set || is_present_gpte(gpte) ||
> -			      !clear_unsync)
> +			      sp->unsync)
>  				nonpresent = shadow_trap_nonpresent_pte;
>  			else
>  				nonpresent = shadow_notrap_nonpresent_pte;

Its better to keep this explicit as a parameter. 
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