linux-kernel - Re: [PATCH] KVM: vgic: Use warpper function to lock/unlock all vcpus in kvm_vgic

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Date:   Thu, 28 Nov 2019 10:07:52 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     linmiaohe <linmiaohe@...wei.com>, maz@...nel.org,
        pbonzini@...hat.com, rkrcmar@...hat.com, james.morse@....com,
        julien.thierry.kdev@...il.com, suzuki.poulose@....com,
        christoffer.dall@....com, catalin.marinas@....com,
        gregkh@...uxfoundation.org, will@...nel.org,
        andre.przywara@....com, tglx@...utronix.de
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: vgic: Use warpper function to lock/unlock all vcpus
 in kvm_vgic_create()

Hi,

On 11/28/19 4:09 AM, linmiaohe wrote:
> From: Miaohe Lin <linmiaohe@...wei.com>
> 
> Use warpper function lock_all_vcpus()/unlock_all_vcpus()
s/warpper/wrapper and also in the title.
> in kvm_vgic_create() to remove duplicated code dealing
> with locking and unlocking all vcpus in a vm.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  virt/kvm/arm/vgic/vgic-init.c | 14 ++++----------
>  1 file changed, 4 insertions(+), 10 deletions(-)
> 
> diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
> index b3c5de48064c..53e3969dfb52 100644
> --- a/virt/kvm/arm/vgic/vgic-init.c
> +++ b/virt/kvm/arm/vgic/vgic-init.c
> @@ -70,7 +70,7 @@ void kvm_vgic_early_init(struct kvm *kvm)
>   */
>  int kvm_vgic_create(struct kvm *kvm, u32 type)
>  {
> -	int i, vcpu_lock_idx = -1, ret;
> +	int i, ret;
>  	struct kvm_vcpu *vcpu;
>  
>  	if (irqchip_in_kernel(kvm))
> @@ -92,11 +92,8 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
>  	 * that no other VCPUs are run while we create the vgic.
>  	 */
>  	ret = -EBUSY;
> -	kvm_for_each_vcpu(i, vcpu, kvm) {
> -		if (!mutex_trylock(&vcpu->mutex))
> -			goto out_unlock;
> -		vcpu_lock_idx = i;
> -	}
> +	if (!lock_all_vcpus(kvm))
> +		return ret;
>  
>  	kvm_for_each_vcpu(i, vcpu, kvm) {
>  		if (vcpu->arch.has_run_once)
> @@ -125,10 +122,7 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
>  		INIT_LIST_HEAD(&kvm->arch.vgic.rd_regions);
>  
>  out_unlock:
> -	for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
> -		vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx);
> -		mutex_unlock(&vcpu->mutex);
> -	}
> +	unlock_all_vcpus(kvm);
>  	return ret;
>  }
>  
> 
Besides, looks good to me
Reviewed-by: Eric Auger <eric.auger@...hat.com>

Thanks

Eric