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Tue, 15 Oct 2024 15:20:10 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AA9F62004F; Tue, 15 Oct 2024 15:20:10 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 133C420040; Tue, 15 Oct 2024 15:20:10 +0000 (GMT) Received: from osiris (unknown [9.152.212.60]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTPS; Tue, 15 Oct 2024 15:20:10 +0000 (GMT) Date: Tue, 15 Oct 2024 17:20:08 +0200 From: Heiko Carstens To: Eric Farman Cc: David Hildenbrand , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, virtualization@lists.linux.dev, linux-doc@vger.kernel.org, kvm@vger.kernel.org, Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Huth , Cornelia Huck , Janosch Frank , Claudio Imbrenda , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , Eugenio =?iso-8859-1?Q?P=E9rez?= , Andrew Morton , Jonathan Corbet , Mario Casquero Subject: Re: [PATCH v2 4/7] s390/physmem_info: query diag500(STORAGE LIMIT) to support QEMU/KVM memory devices Message-ID: <20241015152008.7641-P-hca@linux.ibm.com> References: <20241014144622.876731-1-david@redhat.com> <20241014144622.876731-5-david@redhat.com> <20241014184339.10447-E-hca@linux.ibm.com> <8131b905c61a7baf4bd09ec4a08e1ace84d36754.camel@linux.ibm.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8131b905c61a7baf4bd09ec4a08e1ace84d36754.camel@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-GUID: i1zBRW8UGLcWVcN5Coobxt0ARxFddDl7 X-Proofpoint-ORIG-GUID: Ub7xaX8YqTGNc9RIsPz804moAAXEwY3a X-Proofpoint-UnRewURL: 0 URL was un-rewritten MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 phishscore=0 priorityscore=1501 suspectscore=0 spamscore=0 lowpriorityscore=0 bulkscore=0 clxscore=1015 mlxscore=0 adultscore=0 mlxlogscore=649 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410150105 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 62767C001A X-Stat-Signature: jdwinwqs5u6hg7weoq1xhj3pndtsaaw5 X-Rspam-User: X-HE-Tag: 1729005608-286287 X-HE-Meta: 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 hlIZ4v0R 4R1SIapPbDfDIMpGWBggkvqf7Y1plHP5S2Jopi8OLzJS+VAuogi8tO4+B5I/kg5IODCKvd7AtFBiLhLC+09LfBZeXAutyzMhCnko8jf4bBDqGrTCtqFm3TDSG2caECzzuc+LQ7jvUEiCzUDrlywMnA9yEtTCanvKgY7zAtBQKfxmdjyzyTzN7HEgr+iroUGDywP8gCBxm7gvum5qFkZLhcHGKYS2+/5qN2VUw+JWH0ubuJ7pkReuLV+rtSBoj3E4QoYRlM+kkWgOv1MZJXXl9941xdXzOY++dtZQoAE86SyvS0DQBRS5Bd01dUFJ0qt9J+9secoB45tD46Zk= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Oct 15, 2024 at 11:01:44AM -0400, Eric Farman wrote: > On Mon, 2024-10-14 at 20:43 +0200, Heiko Carstens wrote: > > On Mon, Oct 14, 2024 at 04:46:16PM +0200, David Hildenbrand wrote: ... > > +#define DIAG500_SC_STOR_LIMIT 4 ... > I like the idea of a defined constant here instead of hardcoded, but maybe it should be placed > somewhere in include/uapi so that QEMU can pick it up with update-linux-headers.sh and be in sync > with the kernel, instead of just an equivalent definition in [1] ? > > [1] https://lore.kernel.org/qemu-devel/20241008105455.2302628-8-david@redhat.com/ It is already a mess; we have already subcode 3 defined: #define KVM_S390_VIRTIO_CCW_NOTIFY 3 in arch/s390/include/uapi/asm/virtio-ccw.h which for some reason is uapi. But it doesn't make sense to put the new subcode 4 there too. So what is the end result? Another uapi file? I think resolving this would be a project on its own.