linux-kernel - Re: [PATCH v11 15/26] KVM: s390: Clear Crypto Control Block when using vSIE

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Message-ID: <6c92a083-de57-4813-2078-e35437b87037@redhat.com>
Date:   Wed, 26 Sep 2018 09:16:52 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Tony Krowiak <akrowiak@...ux.vnet.ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        cohuck@...hat.com, kwankhede@...dia.com,
        bjsdjshi@...ux.vnet.ibm.com, pbonzini@...hat.com,
        alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com,
        alifm@...ux.vnet.ibm.com, mjrosato@...ux.vnet.ibm.com,
        jjherne@...ux.vnet.ibm.com, thuth@...hat.com,
        pasic@...ux.vnet.ibm.com, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com,
        frankja@...ux.ibm.com, Pierre Morel <pmorel@...ux.ibm.com>,
        Tony Krowiak <akrowiak@...ux.ibm.com>
Subject: Re: [PATCH v11 15/26] KVM: s390: Clear Crypto Control Block when
 using vSIE

On 26/09/2018 01:16, Tony Krowiak wrote:
> From: Pierre Morel <pmorel@...ux.ibm.com>
> 
> When we clear the Crypto Control Block (CRYCB) used by a guest
> level 2, the vSIE shadow CRYCB for guest level 3 must be updated
> before the guest uses it.
> 
> We achieve this by using the KVM_REQ_VSIE_RESTART synchronous
> request for each vCPU belonging to the guest to force the reload
> of the shadow CRYCB before rerunning the guest level 3.
> 
> Signed-off-by: Pierre Morel <pmorel@...ux.ibm.com>
> Signed-off-by: Tony Krowiak <akrowiak@...ux.ibm.com>
> ---
>  arch/s390/kvm/kvm-s390.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 75aa5aa4a926..c94ef2d0dbe4 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -2043,6 +2043,8 @@ void kvm_arch_crypto_clear_masks(struct kvm *kvm)
>  	memset(&kvm->arch.crypto.crycb->apcb1, 0,
>  	       sizeof(kvm->arch.crypto.crycb->apcb1));
>  
> +	/* recreate the shadow crycb for each vcpu */
> +	kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
>  	kvm_s390_vcpu_unblock_all(kvm);
>  	mutex_unlock(&kvm->lock);
>  }
> 

This should have been squashed into #10, but only if you have to resend.

-- 

Thanks,

David / dhildenb