linux-kernel - Re: [PATCH v5 01/13] KVM: s390: Interface to test whether APXA installed

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Date:   Wed, 16 May 2018 06:45:38 -0400
From:   Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
To:     Cornelia Huck <cohuck@...hat.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
Subject: Re: [PATCH v5 01/13] KVM: s390: Interface to test whether APXA
 installed

On 05/16/2018 06:21 AM, Cornelia Huck wrote:
> On Mon,  7 May 2018 11:11:40 -0400
> Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:
>
>> Relocates an existing static function that tests whether
>> the AP extended addressing facility (APXA) is installed on
>> the linux host. The primary reason for relocating this
>> function is because a new compilation unit (arch/s390/kvm/kvm-ap.c)
>> is being created to contain all of the interfaces and logic
>> for configuring an AP matrix for a KVM guest. Some of its
>> functions will also need to determine whether APXA is installed,
>> so, let's go ahead and relocate this static function as a
>> public interface in kvm-ap.c.
>>
>> Notes:
>> ----
>> 1. The interface to determine whether APXA is installed on the linux
>>     host the information returned from the AP Query Configuration
>>     Information (QCI) function. This function will not be available
>>     if the AP instructions are not installed on the linux host, so a check
>>     will be included to verify that.
>>
>> 2. Currently, the AP bus interfaces accessing the AP instructions will
>>     not be accessible if CONFIG_ZCRYPT=n, so the relevant code will be
>>     temporarily contained in the new arch/s390/kvm/kvm-ap.c file until
>>     the patch(es) to statically build the required AP bus interfaces are
>>     available.
> Any ETA for those interfaces? Would be nice if we could avoid
> introducing temporary interfaces (but I'm certainly not opposing this
> patch).

I'll check with the developer.

>
>> Signed-off-by: Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
>> ---
>>   MAINTAINERS                    |    1 +
>>   arch/s390/include/asm/kvm-ap.h |   60 +++++++++++++++++++++++++++++
>>   arch/s390/kvm/Makefile         |    2 +-
>>   arch/s390/kvm/kvm-ap.c         |   83 ++++++++++++++++++++++++++++++++++++++++
>>   arch/s390/kvm/kvm-s390.c       |   42 +-------------------
>>   5 files changed, 147 insertions(+), 41 deletions(-)
>>   create mode 100644 arch/s390/include/asm/kvm-ap.h
>>   create mode 100644 arch/s390/kvm/kvm-ap.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index eab763f..224e97b 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -7792,6 +7792,7 @@ M:	Christian Borntraeger <borntraeger@...ibm.com>
>>   M:	Janosch Frank <frankja@...ux.ibm.com>
>>   R:	David Hildenbrand <david@...hat.com>
>>   R:	Cornelia Huck <cohuck@...hat.com>
>> +R:	Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
> Don't you want to drop the 'vnet' from your address, as the vnet-less
> form seems to be the one that will continue working from what I've
> heard?
>
>>   L:	linux-s390@...r.kernel.org
>>   W:	http://www.ibm.com/developerworks/linux/linux390/
>>   T:	git git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git
> No objection against this patch, although I still hope it will not be
> needed :)
>