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Tsirkin" , Jason Wang , Xuan Zhuo , Eugenio =?UTF-8?B?UMOpcmV6?= , Andrew Morton , Jonathan Corbet Subject: Re: [PATCH v2 0/7] virtio-mem: s390 support Message-ID: <20241015095735.189a93a9@p-imbrenda.boeblingen.de.ibm.com> In-Reply-To: <20241014185659.10447-H-hca@linux.ibm.com> References: <20241014144622.876731-1-david@redhat.com> <20241014185659.10447-H-hca@linux.ibm.com> Organization: IBM X-Mailer: Claws Mail 4.3.0 (GTK 3.24.43; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Du4l9sP7TVUAjH_iYt432adQvi2pGWuw X-Proofpoint-ORIG-GUID: uFXJhMFRxlEgNTc8MZnarzacqCG1ep_i 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 spamscore=0 malwarescore=0 adultscore=0 clxscore=1011 priorityscore=1501 phishscore=0 mlxlogscore=999 impostorscore=0 lowpriorityscore=0 bulkscore=0 mlxscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410150052 X-Stat-Signature: cyx5fngq741t6kt9oi9tzsf9iedcr4ub X-Rspamd-Queue-Id: 49AC920008 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1728979060-615321 X-HE-Meta: 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 pAznbK59 GTGL5RVOz1HErVpmbqw0YSplR0aoGXwv7sm8YGBat0EzHqDT8iX4mt9HLzPcblNkofep1hxhJ2nDVpyXUaz46EBiuN81IobB1djfbMllIqPjHttMTWlrq3lTmCJ0pX6IVeqr1dBkCUF9RpmgowShw0aB0nFWfVZp2WyBe3gwOl+DGkeuZ8GpBfBUin/Tlmn3kmqAtgSaE1tgYz/By/Y2ZqYgDdnsqgNFP1jXICdZhmdJiJyQlCY1pCC8Y8lgcN/jHkjaNMBA4gGEF01+KQiw039/9YxNUs4UHgLcvP0EsrQxAFkwO/fzkAKJTsPuoZYl1rYIhFhm01hKYNX9JN/M72I00HA== 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, 14 Oct 2024 20:56:59 +0200 Heiko Carstens wrote: > 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. we're working on it :)