linux-kernel - Re: [PATCH v2 03/15] s390: zcrypt: externalize AP instructions available function

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Message-Id: <053311e4-a5a6-0007-4b6a-c24494df48c8@linux.vnet.ibm.com>
Date:   Thu, 1 Mar 2018 09:38:37 +0100
From:   Harald Freudenberger <freude@...ux.vnet.ibm.com>
To:     Cornelia Huck <cohuck@...hat.com>,
        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,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com
Subject: Re: [PATCH v2 03/15] s390: zcrypt: externalize AP instructions
 available function

On 02/28/2018 06:41 PM, Cornelia Huck wrote:
> On Tue, 27 Feb 2018 09:28:01 -0500
> Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:
>
>> If the AP instructions are not available on the linux host, then
>> AP devices can not be interpreted by the SIE. The AP bus has a
>> function it uses to determine if the AP instructions are
>> available. This patch provides a new function that wraps the
>> AP bus's function to externalize it for use by KVM.
>>
>> Signed-off-by: Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
>> Reviewed-by: Pierre Morel <pmorel@...ux.vnet.ibm.com>
>> ---
>>  arch/s390/include/asm/ap.h   |    7 +++++++
>>  drivers/s390/crypto/ap_bus.c |    6 ++++++
>>  2 files changed, 13 insertions(+), 0 deletions(-)
> While I don't see anything wrong with this patch as it stands, you need
> to be careful to call this only from vfio-ap code (which depends on
> CONFIG_ZCRYPT).
>
> Speaking of which: the ap_bus part cannot be a module, but only
> built-in, right? So we don't get additional module complications?
Right, the AP bus is not available as a module but statically build.
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