linux-kernel - Re: [PATCH v11 24/26] KVM: s390: device attrs to enable/disable AP interpretation

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Message-ID: <20180926154446.2f6e666f.cohuck@redhat.com>
Date:   Wed, 26 Sep 2018 15:44:46 +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, freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.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, Tony Krowiak <akrowiak@...ux.ibm.com>
Subject: Re: [PATCH v11 24/26] KVM: s390: device attrs to enable/disable AP
 interpretation

On Tue, 25 Sep 2018 19:16:39 -0400
Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:

> From: Tony Krowiak <akrowiak@...ux.ibm.com>
> 
> Introduces two new VM crypto device attributes (KVM_S390_VM_CRYPTO)
> to enable or disable AP instruction interpretation from userspace
> via the KVM_SET_DEVICE_ATTR ioctl:
> 
> * The KVM_S390_VM_CRYPTO_ENABLE_APIE attribute enables hardware
>   interpretation of AP instructions executed on the guest.
> 
> * The KVM_S390_VM_CRYPTO_DISABLE_APIE attribute disables hardware
>   interpretation of AP instructions executed on the guest. In this
>   case the instructions will be intercepted and pass through to
>   the guest.
> 
> Signed-off-by: Tony Krowiak <akrowiak@...ux.ibm.com>
> ---
>  arch/s390/include/uapi/asm/kvm.h |  2 ++
>  arch/s390/kvm/kvm-s390.c         | 31 ++++++++++++++++++++++++++++---
>  2 files changed, 30 insertions(+), 3 deletions(-)

Other than the nits that David had, this looks fine.

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