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

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Date:   Wed, 13 Jan 2021 18:18:39 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Marc Zyngier <maz@...nel.org>
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()

Hi Marc,

On 12/28/20 4:41 PM, Marc Zyngier wrote:
> 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.
sure

Thanks

Eric
> 
>>
>>  	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.
>