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

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Date:   Thu, 17 May 2018 11:44:21 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Harald Freudenberger <freude@...ux.ibm.com>
Cc:     Tony Krowiak <akrowiak@...ux.vnet.ibm.com>,
        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 Thu, 17 May 2018 11:11:41 +0200
Harald Freudenberger <freude@...ux.ibm.com> wrote:

> On 16.05.2018 12:45, Tony Krowiak wrote:
> > 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.  
> The proposal is out on the internal mailing list. I'd like to release it (internal) tomorrow or start
> next week. Already talked with Christian about this because we need to align it somehow with
> kvm and s390 kernel development.

Great, thanks for the update!