linux-kernel - Re: [PATCH 3/3] KVM: arm64: Use kvm_write_guest

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Message-ID: <20200817085257.k3i2nyhqn2nwdotx@kamzik.brq.redhat.com>
Date:   Mon, 17 Aug 2020 10:52:57 +0200
From:   Andrew Jones <drjones@...hat.com>
To:     Keqian Zhu <zhukeqian1@...wei.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Steven Price <steven.price@....com>, wanghaibin.wang@...wei.com
Subject: Re: [PATCH 3/3] KVM: arm64: Use kvm_write_guest_lock when init
 stolen time

On Mon, Aug 17, 2020 at 11:37:29AM +0800, Keqian Zhu wrote:
> There is a lock version kvm_write_guest. Use it to simplify code.
> 
> Signed-off-by: Keqian Zhu <zhukeqian1@...wei.com>
> ---
>  arch/arm64/kvm/pvtime.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/arch/arm64/kvm/pvtime.c b/arch/arm64/kvm/pvtime.c
> index f7b52ce..2b24e7f 100644
> --- a/arch/arm64/kvm/pvtime.c
> +++ b/arch/arm64/kvm/pvtime.c
> @@ -55,7 +55,6 @@ gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu)
>  	struct pvclock_vcpu_stolen_time init_values = {};
>  	struct kvm *kvm = vcpu->kvm;
>  	u64 base = vcpu->arch.steal.base;
> -	int idx;
>  
>  	if (base == GPA_INVALID)
>  		return base;
> @@ -66,10 +65,7 @@ gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu)
>  	 */
>  	vcpu->arch.steal.steal = 0;
>  	vcpu->arch.steal.last_steal = current->sched_info.run_delay;
> -
> -	idx = srcu_read_lock(&kvm->srcu);
> -	kvm_write_guest(kvm, base, &init_values, sizeof(init_values));
> -	srcu_read_unlock(&kvm->srcu, idx);
> +	kvm_write_guest_lock(kvm, base, &init_values, sizeof(init_values));
>  
>  	return base;
>  }
> -- 
> 1.8.3.1
>

Reviewed-by: Andrew Jones <drjones@...hat.com>