linux-kernel - Re: [PATCH RFC v3 2/9] KVM: arm/arm64: fix vcpu self-detection in vgic_v3_dispatch

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Date:   Tue, 22 Aug 2017 13:43:02 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Radim Krčmář <rkrcmar@...hat.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-mips@...ux-mips.org, kvm-ppc@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Christoffer Dall <cdall@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Cornelia Huck <cohuck@...hat.com>,
        James Hogan <james.hogan@...tec.com>,
        Paul Mackerras <paulus@...abs.org>,
        Alexander Graf <agraf@...e.com>
Subject: Re: [PATCH RFC v3 2/9] KVM: arm/arm64: fix vcpu self-detection in
 vgic_v3_dispatch_sgi()

On 21.08.2017 22:35, Radim Krčmář wrote:
> The index in kvm->vcpus array and vcpu->vcpu_id are very different
> things.  Comparing struct kvm_vcpu pointers is a sure way to know.
> 
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
>  virt/kvm/arm/vgic/vgic-mmio-v3.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c b/virt/kvm/arm/vgic/vgic-mmio-v3.c
> index 408ef06638fc..9d4b69b766ec 100644
> --- a/virt/kvm/arm/vgic/vgic-mmio-v3.c
> +++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c
> @@ -797,7 +797,6 @@ void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg)
>  	u16 target_cpus;
>  	u64 mpidr;
>  	int sgi, c;
> -	int vcpu_id = vcpu->vcpu_id;
>  	bool broadcast;
>  
>  	sgi = (reg & ICC_SGI1R_SGI_ID_MASK) >> ICC_SGI1R_SGI_ID_SHIFT;
> @@ -821,7 +820,7 @@ void vgic_v3_dispatch_sgi(struct kvm_vcpu *vcpu, u64 reg)
>  			break;
>  
>  		/* Don't signal the calling VCPU */
> -		if (broadcast && c == vcpu_id)
> +		if (broadcast && c_vcpu == vcpu)
>  			continue;
>  
>  		if (!broadcast) {
> 

Yes, this looks correct to me.

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 

Thanks,

David