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bh=ATwg+RSDVBV28PIF7Fnc5aNz68PE110+SfeCsnKKGrg=; b=ImfIGLaIyHkTjWVWjlooKplxxiBD5KTB8P5unhvzimD3IW4Xi9WoGci40FMo0Be87sTcFB k3vGt0TYudNgCsjp4yB9mtNOscN2LSxH0SN3YQ5bjI2gLUzQsmtPfd+vhlhErjOOWoiLt9 B6lVmAniQMYdJZ3QqHKftkFJmaHE4sc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-204-bSCgPL82M7ecvjHT14UthA-1; Wed, 29 Jul 2020 04:58:14 -0400 X-MC-Unique: bSCgPL82M7ecvjHT14UthA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C530318C63CF; Wed, 29 Jul 2020 08:58:12 +0000 (UTC) Received: from [10.36.114.111] (ovpn-114-111.ams2.redhat.com [10.36.114.111]) by smtp.corp.redhat.com (Postfix) with ESMTP id 035CC7854D; Wed, 29 Jul 2020 08:58:00 +0000 (UTC) Subject: Re: [PATCH RFCv3 6/9] s390x/diag: subcode to query device memory region To: Cornelia Huck References: <20200724143750.59836-1-david@redhat.com> <20200724143750.59836-7-david@redhat.com> <20200727114819.3f816010.cohuck@redhat.com> <963e5931-117e-48cb-b829-d630abff9e42@redhat.com> <20200727120930.7b8803e4.cohuck@redhat.com> <520ac822-df67-b33a-378f-a8f91a3bed2f@redhat.com> <20200727111546.GA13770@osiris> <68205bc1-1ac4-a023-0531-aa1a0c91e17d@redhat.com> <20200728091014.173a7d18.cohuck@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 MIME-Version: 1.0 In-Reply-To: <20200728091014.173a7d18.cohuck@redhat.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=63.128.21.74; envelope-from=david@redhat.com; helo=us-smtp-delivery-74.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/29 01:09:48 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas Huth , Janosch Frank , "Michael S . Tsirkin" , Heiko Carstens , qemu-devel@nongnu.org, Halil Pasic , Christian Borntraeger , qemu-s390x@nongnu.org, Claudio Imbrenda , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 28.07.20 09:10, Cornelia Huck wrote: > On Mon, 27 Jul 2020 14:02:47 +0200 > David Hildenbrand wrote: > >> On 27.07.20 13:15, Heiko Carstens wrote: >>> On Mon, Jul 27, 2020 at 12:12:02PM +0200, David Hildenbrand wrote: >>>>>>>> +#define DIAG500_DEVICE_MEMORY_REGION 4 >>>>>>> >>>>>>> Regardless what we end up with, this needs to be specified >>>>>>> somewhere(tm). >>>>>> >>>>>> Yeah, there, we should also document the existing subcodes. What would >>>>>> be the right place for this? The kernel feels somewhat wrong to me. >>>>> >>>>> The still supported subcode 3 is properly specified in the virtio spec. >>>>> That's not a good place for that new one, though. >>>>> >>>>> QEMU is probably a better place than the kernel to specify stuff, >>>>> although it's not really ideal, either. OTOH, do we ever expect other >>>>> hypervisors to implement this new subcode? >>>> >>>> cloud-hypervisor implements virtio-mem. If it were ever to support s390x >>>> (guess it does not yet), it would also want to implement that one. But >>>> then, it can just look at QEMU doc I guess :) >>> >>> It must be well defined and easy to find also for kernel developers >>> who actually have to care about memory detection code :) >> >> So I'd suggest documenting it in QEMU (docs/specs ...) for now, and >> referencing it from the relevant Linux patch - other suggestions? > > That's probably the easiest way for now... the kernel's s390-diag.rst > should also point to it. > > However, I think we really need a central place for definitions that > are not just a Linux/QEMU interface, but can potentially also be used > by other hypervisors/guests. Nothing as complicated as an OASIS spec, > but maybe a git??b project? Sounds good. Maintainers? I can volunteer (+setup/create initial version), but would be good to have other QEMU/KVM maintainers there as well. -- Thanks, David / dhildenb