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(p200300cbc71e06009fbbf0bfd9585c70.dip0.t-ipconnect.de. [2003:cb:c71e:600:9fbb:f0bf:d958:5c70]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-430d748dd50sm162401745e9.47.2024.10.14.12.17.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 14 Oct 2024 12:17:57 -0700 (PDT) Message-ID: Date: Mon, 14 Oct 2024 21:17:56 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/7] virtio-mem: s390 support To: Heiko Carstens 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 , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Andrew Morton , Jonathan Corbet References: <20241014144622.876731-1-david@redhat.com> <20241014185659.10447-H-hca@linux.ibm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20241014185659.10447-H-hca@linux.ibm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 6D7271A0011 X-Stat-Signature: q3cptyw3bz4y9wf5mtzffq7noopzim9u X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1728933473-309955 X-HE-Meta: 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 4/AyqoyD QJpfkB6HFX/PYnpGRufFLdHYetyoC41lFp4+zWLCUBZQCZDP2NOjKBY1j1GN414K4/xa9XPkgHGulUv4guhzjba2yrfWfAplHtf3u7SP4kk3/I2YrbwjLXi+mUYBs77iQ90aqWrSD7Rf9kJ2kAqXNBS6JB/Vmtw20gGLNfauC+Pqp/Izyp4nPaUzHi2VD6YrYStytVkfk1faOIYkdx3yoOi9asTK79cPNubQdlEdoKaabusXcgBGCuRaflkjKJAlGiP6ky2iijMdDNT95GjuhOjF1Cl+rQdo7O60yD5C6oVkKSCrxTGBSc4NnDT1ejcWmdTftufKely8tv7wAcQEFdMZZ7FrENXAD2cCh8oIlXSVg/TwSPXepTuYlt4AgO5E6MJkoA0lON2hQiGN4EjZnNpGr/A== 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 14.10.24 20:56, 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? MST suggested via the s390 tree in v1. > > This could go via s390, however in any case this needs reviews and/or > Acks from kvm folks. Yes, hoping there will be some review (there was some on the QEMU series). -- Cheers, David / dhildenb