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

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Date:   Fri, 20 Apr 2018 10:57:57 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, borntraeger@...ibm.com,
        pmorel@...ux.vnet.ibm.com, pasic@...ux.vnet.ibm.com,
        pbonzini@...hat.com, rkrcmar@...hat.com
Subject: Re: [PATCH] KVM: s390: reset crypto attributes for all vcpus

On Thu, 19 Apr 2018 17:13:52 -0400
Tony Krowiak <akrowiak@...ux.vnet.ibm.com> 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 is incorporated into the kvm_s390_vm_set_crypto(kvm)
> function to fix a reported issue whereby the crypto key wrapping
> attributes could potentially get out of synch for running vcpus.
> 
> Reported-by: Halil Pasic <pasic@...ux.vnet.ibm.com>
> Signed-off-by: Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
> ---
>  arch/s390/kvm/kvm-s390.c |   18 ++++++++++++++----
>  arch/s390/kvm/kvm-s390.h |   13 +++++++++++++
>  2 files changed, 27 insertions(+), 4 deletions(-)

Reviewed-by: Cornelia Huck <cohuck@...hat.com>