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Mon, 14 Oct 2024 18:57:02 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F30CA2004E; Mon, 14 Oct 2024 18:57:01 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 03BE92004B; Mon, 14 Oct 2024 18:57:01 +0000 (GMT) Received: from osiris (unknown [9.171.66.174]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTPS; Mon, 14 Oct 2024 18:57:00 +0000 (GMT) Date: Mon, 14 Oct 2024 20:56:59 +0200 From: Heiko Carstens To: David Hildenbrand Cc: 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 Subject: Re: [PATCH v2 0/7] virtio-mem: s390 support Message-ID: <20241014185659.10447-H-hca@linux.ibm.com> References: <20241014144622.876731-1-david@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241014144622.876731-1-david@redhat.com> X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 6uFDGy-zlz1QTPEIrQYEpX_XW_Pumpmi X-Proofpoint-ORIG-GUID: Or6XZdCkJUWtzOmMfibubfT24pmJTuiG 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=2024-10-14_12,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 bulkscore=0 suspectscore=0 adultscore=0 priorityscore=1501 impostorscore=0 mlxlogscore=999 phishscore=0 clxscore=1015 malwarescore=0 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410140135 X-Rspam-User: X-Stat-Signature: oi5fofee3m6xyrcmyqxwbhhpuuqyqf4q X-Rspamd-Queue-Id: D60F940009 X-Rspamd-Server: rspam02 X-HE-Tag: 1728932222-921179 X-HE-Meta: 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 pKkLn3wG s5hRJiBdull4YMo/HZsAW8s0JNUjz6EczU7LiDhVMdNivUgriBQByPg6X0mRVQc3WXM7lKWVIIYMjdR1JgpYEuoYgte9/Joqgjkf1K8pk5A7h3vasCt2sk8ESAFGoxxG5LZHUw+YLx7G72rl30CHGvtVZcrvCGigNii3m/hk/JEkMogcrjkMRdf9dMsf/JRuQ530t7Gt0mKmrs3Dd+I/1HfLXbbg+QoR2DBub 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 Mon, Oct 14, 2024 at 04:46:12PM +0200, David Hildenbrand wrote: > Let's finally add s390 support for virtio-mem; my last RFC was sent > 4 years ago, and a lot changed in the meantime. > > The latest QEMU series is available at [1], which contains some more > details and a usage example on s390 (last patch). > > There is not too much in here: The biggest part is querying a new diag(500) > STORAGE_LIMIT hypercall to obtain the proper "max_physmem_end". > > The last two patches are not strictly required but certainly nice-to-have. > > Note that -- in contrast to standby memory -- virtio-mem memory must be > configured to be automatically onlined as soon as hotplugged. The easiest > approach is using the "memhp_default_state=" kernel parameter or by using > proper udev rules. More details can be found at [2]. > > I have reviving+upstreaming a systemd service to handle configuring > that on my todo list, but for some reason I keep getting distracted ... > > I tested various things, including: > * Various memory hotplug/hotunplug combinations > * Device hotplug/hotunplug > * /proc/iomem output > * reboot > * kexec > * kdump: make sure we don't hotplug memory > > One remaining work item is kdump support for virtio-mem memory. This will > be sent out separately once initial support landed. Besides the open kdump question, which I think is quite important, how is this supposed to go upstream? This could go via s390, however in any case this needs reviews and/or Acks from kvm folks.