linux-kernel - Re: [PATCH] KVM/MMU: Simplify __kvm_sync

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Date:   Wed, 18 Jul 2018 13:29:53 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Tianyu Lan <Tianyu.Lan@...rosoft.com>
Cc:     "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM/MMU: Simplify __kvm_sync_page() function

On 18/07/2018 08:12, Tianyu Lan wrote:
> Merge check of "sp->role.cr4_pae != !!is_pae(vcpu))" and "vcpu->
> arch.mmu.sync_page(vcpu, sp) == 0". kvm_mmu_prepare_zap_page()
> is called under both these conditions.
> 
> Signed-off-by: Lan Tianyu <Tianyu.Lan@...rosoft.com>
> ---
>  arch/x86/kvm/mmu.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index d594690d8b95..c2c1fd66fb36 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -2117,12 +2117,8 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
>  static bool __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
>  			    struct list_head *invalid_list)
>  {
> -	if (sp->role.cr4_pae != !!is_pae(vcpu)) {
> -		kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list);
> -		return false;
> -	}
> -
> -	if (vcpu->arch.mmu.sync_page(vcpu, sp) == 0) {
> +	if (sp->role.cr4_pae != !!is_pae(vcpu)
> +	    || vcpu->arch.mmu.sync_page(vcpu, sp) == 0) {
>  		kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list);
>  		return false;
>  	}
> 

Queued, thanks.

Paolo