linux-kernel - Re: [PATCH v4 02/15] KVM: s390: reset crypto attributes for all vcpus

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Message-Id: <41496d07-54b3-5cc6-8803-a935f6d821ee@linux.vnet.ibm.com>
Date:   Tue, 17 Apr 2018 16:29:40 +0200
From:   Halil Pasic <pasic@...ux.vnet.ibm.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, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com
Subject: Re: [PATCH v4 02/15] KVM: s390: reset crypto attributes for all vcpus



On 04/15/2018 11:22 PM, Tony Krowiak wrote:
> Introduces a new function to reset the crypto attributes for all
> vcpus whether they are running or not. Each vcpu in KVM will
> be removed from SIE prior to resetting the crypto attributes in its
> SIE state description. After all vcpus have had their crypto attributes
> reset the vcpus will be restored to SIE.
> 
> This function will be used in a later patch to set the ECA.28
> bit in the SIE state description to enable interpretive execution of
> AP instructions. It will also be incorporated into the
> kvm_s390_vm_set_crypto(kvm) function to fix an issue whereby the crypto
> key wrapping attributes could potentially get out of synch for running
> vcpus.
> 

Wasn't this 'issue' reported by me by any chance?

I agree with Connnie, we don't need the forward reference to
ECA.28.

Regards,
Halil

> Signed-off-by: Tony Krowiak<akrowiak@...ux.vnet.ibm.com>