linux-kernel - Re: [PATCH 4/9] KVM: arm/arm64: vgic: Reset base address on kvm_vgic_dist

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Date:   Mon, 28 Dec 2020 15:41:31 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Eric Auger <eric.auger@...hat.com>
Cc:     eric.auger.pro@...il.com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        drjones@...hat.com, alexandru.elisei@....com, james.morse@....com,
        julien.thierry.kdev@...il.com, suzuki.poulose@....com,
        shuah@...nel.org, pbonzini@...hat.com
Subject: Re: [PATCH 4/9] KVM: arm/arm64: vgic: Reset base address on kvm_vgic_dist_destroy()

On Sat, 12 Dec 2020 18:50:05 +0000,
Eric Auger <eric.auger@...hat.com> wrote:
> 
> On vgic_dist_destroy(), the addresses are not reset. However for
> kvm selftest purpose this would allow to continue the test execution
> even after a failure when running KVM_RUN. So let's reset the
> base addresses.
> 
> Signed-off-by: Eric Auger <eric.auger@...hat.com>
> ---
>  arch/arm64/kvm/vgic/vgic-init.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c
> index 32e32d67a127..6147bed56b1b 100644
> --- a/arch/arm64/kvm/vgic/vgic-init.c
> +++ b/arch/arm64/kvm/vgic/vgic-init.c
> @@ -335,14 +335,16 @@ static void kvm_vgic_dist_destroy(struct kvm *kvm)
>  	kfree(dist->spis);
>  	dist->spis = NULL;
>  	dist->nr_spis = 0;
> +	dist->vgic_dist_base = VGIC_ADDR_UNDEF;
>  
> -	if (kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
> +	if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) {
>  		list_for_each_entry_safe(rdreg, next, &dist->rd_regions, list) {
>  			list_del(&rdreg->list);
>  			kfree(rdreg);
>  		}
>  		INIT_LIST_HEAD(&dist->rd_regions);
> -	}
> +	} else
> +		kvm->arch.vgic.vgic_cpu_base = VGIC_ADDR_UNDEF;

Since you have converted the hunk above to use dist->, you could do
the same thing here. And the coding style dictates that you need {} on
the else side as well.

>
>  	if (vgic_has_its(kvm))
>  		vgic_lpi_translation_cache_destroy(kvm);
> @@ -362,6 +364,7 @@ void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu)
>  	vgic_flush_pending_lpis(vcpu);
>  
>  	INIT_LIST_HEAD(&vgic_cpu->ap_list_head);
> +	vgic_cpu->rd_iodev.base_addr = VGIC_ADDR_UNDEF;
>  }
>  
>  /* To be called with kvm->lock held */
> -- 
> 2.21.3
> 
> 

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.