Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Fri, 17 Aug 2018 15:27:03 +0200
From:   Cornelia Huck <cohuck@redhat.com>
To:     Tony Krowiak <akrowiak@linux.ibm.com>
Cc:     Tony Krowiak <akrowiak@linux.vnet.ibm.com>,
        linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, freude@de.ibm.com, schwidefsky@de.ibm.com,
        heiko.carstens@de.ibm.com, borntraeger@de.ibm.com,
        kwankhede@nvidia.com, bjsdjshi@linux.vnet.ibm.com,
        pbonzini@redhat.com, alex.williamson@redhat.com,
        pmorel@linux.vnet.ibm.com, alifm@linux.vnet.ibm.com,
        mjrosato@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com,
        thuth@redhat.com, pasic@linux.vnet.ibm.com, berrange@redhat.com,
        fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com,
        frankja@linux.ibm.com
Subject: Re: [PATCH v9 04/22] s390/zcrypt: Integrate ap_asm.h into
 include/asm/ap.h.
Message-ID: <20180817152703.6de02166.cohuck@redhat.com>
In-Reply-To: <49e99e8a-7de8-abde-6775-af11680db13d@linux.ibm.com>
References: <1534196899-16987-1-git-send-email-akrowiak@linux.vnet.ibm.com>
        <1534196899-16987-5-git-send-email-akrowiak@linux.vnet.ibm.com>
        <20180814104335.4bc3630a.cohuck@redhat.com>
        <49e99e8a-7de8-abde-6775-af11680db13d@linux.ibm.com>
Organization: Red Hat GmbH
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Fri, 17 Aug 2018 09:18:51 -0400
Tony Krowiak <akrowiak@linux.ibm.com> wrote:

> On 08/14/2018 04:43 AM, Cornelia Huck wrote:
> > On Mon, 13 Aug 2018 17:48:01 -0400
> > Tony Krowiak <akrowiak@linux.vnet.ibm.com> wrote:
> >  
> >> From: Harald Freudenberger <freude@de.ibm.com>
> >>
> >> Move all the inline functions from the ap bus header
> >> file ap_asm.h into the in-kernel api header file
> >> arch/s390/include/asm/ap.h so that KVM can make use
> >> of all the low level AP functions.
> >>
> >> Signed-off-by: Harald Freudenberger <freude@de.ibm.com>
> >> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> >> Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
> >> ---
> >>   arch/s390/include/asm/ap.h     |  284 ++++++++++++++++++++++++++++++++++++----
> >>   drivers/s390/crypto/ap_bus.c   |   23 +---
> >>   drivers/s390/crypto/ap_bus.h   |    1 +
> >>   drivers/s390/crypto/ap_card.c  |    1 -
> >>   drivers/s390/crypto/ap_queue.c |    1 -
> >>   5 files changed, 260 insertions(+), 50 deletions(-)
> >>
> >> diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h
> >> index c1bedb4..887494a 100644
> >> --- a/arch/s390/include/asm/ap.h
> >> +++ b/arch/s390/include/asm/ap.h
> >> @@ -47,6 +47,50 @@ struct ap_queue_status {
> >>   };
> >>   
> >>   /**
> >> + * ap_intructions_available() - Test if AP instructions are available.
> >> + *
> >> + * Returns 1 if the AP instructions are installed, otherwise 0.
> >> + */
> >> +static inline int ap_instructions_available(void)
> >> +{
> >> +	register unsigned long reg0 asm ("0") = AP_MKQID(0, 0);
> >> +	register unsigned long reg1 asm ("1") = 0;
> >> +	register unsigned long reg2 asm ("2") = 0;
> >> +
> >> +	asm volatile(
> >> +		"   .long 0xb2af0000\n"		/* PQAP(TAPQ) */
> >> +		"0: la    %0,1\n"
> >> +		"1:\n"
> >> +		EX_TABLE(0b, 1b)
> >> +		: "+d" (reg1), "+d" (reg2)
> >> +		: "d" (reg0)
> >> +		: "cc");
> >> +	return reg1;
> >> +}  
> > I think upstream this change (have this function return !0 when the
> > instructions are installed) will be an addon patch to the one which has
> > already made its way into master. Not really relevant for the remainder
> > of this patch series, though.  
> 
> I noticed that Harald's patches showed up in our master branch yesterday
> without this change.

Yep, but the s390/features branch has the patch changing the return
code. Maybe just wait for the next s390 pull request before you
rebase :)