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From: Tony Krowiak <akrowiak@linux.ibm.com>
To: Cornelia Huck <cohuck@redhat.com>
Cc: Harald Freudenberger <freude@linux.ibm.com>,
	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 v8 04/22] s390/zcrypt: Integrate ap_asm.h into include/asm/ap.h.
Date: Fri, 10 Aug 2018 11:50:07 -0400
Message-ID: <5661f3b9-6b2b-8a50-bc22-97f364f8ea33@linux.ibm.com> (raw)
In-Reply-To: <20180810104929.6d40edef.cohuck@redhat.com>

On 08/10/2018 04:49 AM, Cornelia Huck wrote:
> On Thu, 9 Aug 2018 12:06:56 -0400
> Tony Krowiak <akrowiak@linux.ibm.com> wrote:
>
>> On 08/09/2018 05:17 AM, Harald Freudenberger wrote:
>>> On 09.08.2018 11:06, Cornelia Huck wrote:
>>>> On Wed,  8 Aug 2018 10:44:14 -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>
>>>> You should add your own s-o-b if you are sending on patches written by
>>>> others (even if it does not matter in the end, when they are merged
>>>> through a different path anyway.)
>>>>   
>>>>> ---
>>>>>    arch/s390/include/asm/ap.h     |  284 ++++++++++++++++++++++++++++++++++++----
>>>>>    drivers/s390/crypto/ap_asm.h   |  261 ------------------------------------
>>>>>    drivers/s390/crypto/ap_bus.c   |   21 +---
>>>>>    drivers/s390/crypto/ap_bus.h   |    1 +
>>>>>    drivers/s390/crypto/ap_card.c  |    1 -
>>>>>    drivers/s390/crypto/ap_queue.c |    1 -
>>>>>    6 files changed, 259 insertions(+), 310 deletions(-)
>>>>>    delete mode 100644 drivers/s390/crypto/ap_asm.h
>>>>>
>>>>> diff --git a/arch/s390/include/asm/ap.h b/arch/s390/include/asm/ap.h
>>>>> index c1bedb4..046e044 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 0 if the AP instructions are installed.
>>>> Stumbled over this when I was looking at the usage in patch 7: if I see
>>>> a function called '_available' return 0, I'd assume that whatever the
>>>> function tests for is *not* available.
>>>>
>>>> Rather call this function ap_instructions_check_availability() (and
>>>> keep the return code convention), or switch this to return 0 if not
>>>> available and !0 if available?
>>> Good catch, Cony you are right. I'll fix this to return 1 if AP instructions
>>> are available and 0 if not. However, this patch will come via Martin's pipe
>>> to the Linus Torwald kernel sources.
>> Is your intent to simply indicate whether the AP instructions are
>> available or
>> not; or is the intention to indicate whether the AP instructions are
>> available
>> and if not, they why? In the former, then I agree that a boolean should be
>> returned; however, if the case is the latter, then what you have is fine but
>> maybe the function name should be changed as Connie suggests.
> So, can this actually fail for any reason other than "instructions not
> installed"? Even if it did, the end result is that the instructions are
> not usable -- I don't think the "why" would be interesting at that
> point.

The only case I can think of is if something is hosed and it causes an
exception. In that case, should we proceed?

>
>>>>> + */
>>>>> +static inline int ap_instructions_available(void)
>>>>> +{
>>>>> +	register unsigned long reg0 asm ("0") = AP_MKQID(0, 0);
>>>>> +	register unsigned long reg1 asm ("1") = -ENODEV;
>>>>> +	register unsigned long reg2 asm ("2");
>>>>> +
>>>>> +	asm volatile(
>>>>> +		"   .long 0xb2af0000\n"		/* PQAP(TAPQ) */
>>>>> +		"0: la    %0,0\n"
>>>>> +		"1:\n"
>>>>> +		EX_TABLE(0b, 1b)
>>>>> +		: "+d" (reg1), "=d" (reg2)
>>>>> +		: "d" (reg0)
>>>>> +		: "cc");
>>>>> +	return reg1;
>>>>> +}



  parent reply index

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-08 14:44 [PATCH v8 00/22] vfio-ap: guest dedicated crypto adapters Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 01/22] s390/zcrypt: Add ZAPQ inline function Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 02/22] s390/zcrypt: Review inline assembler constraints Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 03/22] s390/zcrypt: Show load of cards and queues in sysfs Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 04/22] s390/zcrypt: Integrate ap_asm.h into include/asm/ap.h Tony Krowiak
2018-08-09  9:06   ` Cornelia Huck
2018-08-09  9:17     ` Harald Freudenberger
2018-08-09 13:45       ` Harald Freudenberger
2018-08-09 16:06       ` Tony Krowiak
2018-08-10  8:49         ` Cornelia Huck
2018-08-10  9:37           ` Harald Freudenberger
2018-08-10 15:53             ` Tony Krowiak
2018-08-10 15:50           ` Tony Krowiak [this message]
2018-08-09 15:18     ` Tony Krowiak
2018-08-09 15:43       ` Heiko Carstens
2018-08-09 16:55         ` Tony Krowiak
2018-08-13  9:24     ` Harald Freudenberger
2018-08-13  9:34       ` Cornelia Huck
2018-08-08 14:44 ` [PATCH v8 05/22] KVM: s390: vsie: simulate VCPU SIE entry/exit Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 06/22] KVM: s390: introduce and use KVM_REQ_VSIE_RESTART Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 07/22] KVM: s390: refactor crypto initialization Tony Krowiak
2018-08-09  5:58   ` Janosch Frank
2018-08-10 16:13     ` Tony Krowiak
2018-08-09  8:25   ` David Hildenbrand
2018-08-09 19:54     ` Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 08/22] s390: vfio-ap: base implementation of VFIO AP device driver Tony Krowiak
2018-08-09 10:12   ` Cornelia Huck
2018-08-08 14:44 ` [PATCH v8 09/22] s390: vfio-ap: register matrix device with VFIO mdev framework Tony Krowiak
2018-08-09 11:06   ` Cornelia Huck
2018-08-09 16:27     ` Pierre Morel
2018-08-10  8:59       ` Cornelia Huck
2018-08-08 14:44 ` [PATCH v8 10/22] s390: vfio-ap: sysfs interfaces to configure adapters Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 11/22] s390: vfio-ap: sysfs interfaces to configure domains Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 12/22] s390: vfio-ap: sysfs interfaces to configure control domains Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 13/22] s390: vfio-ap: sysfs interface to view matrix mdev matrix Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 14/22] KVM: s390: interfaces to clear CRYCB masks Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 15/22] s390: vfio-ap: implement mediated device open callback Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 16/22] s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 17/22] s390: vfio-ap: zeroize the AP queues Tony Krowiak
2018-08-10  9:14   ` Cornelia Huck
2018-08-10 10:49     ` Pierre Morel
2018-08-10 11:16       ` Cornelia Huck
2018-08-10 16:24         ` Tony Krowiak
2018-08-13  6:57           ` Cornelia Huck
2018-08-08 14:44 ` [PATCH v8 18/22] s390: vfio-ap: implement VFIO_DEVICE_RESET ioctl Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 19/22] KVM: s390: Clear Crypto Control Block when using vSIE Tony Krowiak
2018-08-09  8:10   ` David Hildenbrand
2018-08-09  8:50     ` Pierre Morel
2018-08-09  8:57     ` Pierre Morel
2018-08-08 14:44 ` [PATCH v8 20/22] KVM: s390: Handling of Cypto control block in VSIE Tony Krowiak
2018-08-09  6:20   ` Janosch Frank
2018-08-09  7:33     ` Pierre Morel
2018-08-08 14:44 ` [PATCH v8 21/22] KVM: s390: CPU model support for AP virtualization Tony Krowiak
2018-08-09  8:17   ` David Hildenbrand
2018-08-09  8:34     ` Harald Freudenberger
2018-08-09 20:27     ` Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 22/22] s390: doc: detailed specifications " Tony Krowiak
2018-08-08 15:06 ` [PATCH v8 00/22] vfio-ap: guest dedicated crypto adapters Janosch Frank
2018-08-08 16:25 ` Cornelia Huck
2018-08-08 22:52   ` Tony Krowiak

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