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(p200300cbc70d3a00d73c06a8ca9f1df7.dip0.t-ipconnect.de. [2003:cb:c70d:3a00:d73c:6a8:ca9f:1df7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38a1c828a8dsm53157942f8f.2.2025.01.08.04.14.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 Jan 2025 04:14:24 -0800 (PST) Message-ID: <29278ec5-a7ec-4935-94e2-0b56e601f385@redhat.com> Date: Wed, 8 Jan 2025 13:14:22 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 00/12] fs/proc/vmcore: kdump support for virtio-mem on s390 To: Heiko Carstens , "Michael S. Tsirkin" Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, virtualization@lists.linux.dev, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, kexec@lists.infradead.org, Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Baoquan He , Vivek Goyal , Dave Young , Thomas Huth , Cornelia Huck , Janosch Frank , Claudio Imbrenda , Eric Farman , Andrew Morton References: <20241204125444.1734652-1-david@redhat.com> <20250108070407-mutt-send-email-mst@kernel.org> <20250108121043.7704-I-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: <20250108121043.7704-I-hca@linux.ibm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 9Mly7u0E26cOzjzlWLUqu6XDs9vRL8bcUt2Q3Rgz1qw_1736338466 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: 4F76FC0003 X-Stat-Signature: qxxeymbrn1pa14yxic1qhgkx83xmbata X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1736338469-963512 X-HE-Meta: U2FsdGVkX197AFfN1oeQF7e1+Fy8z4GZ9VxPcYWIIJcaAnCNJUj0xrydfYe0/xNKzAX4GhjRm6mlmAZAgvruveN4E/kddT2Vyn/9WorKqr28PWBrBNk9XBPhnYXKoqTB/ZxMD3QNBigK4RMOKAht7wrZwJPWaXLeQDejMV/mNJSHp7SMX2Gjebg/Fi6W4+2jmymsr/XyJYGAjsxiF9CeDFK2Cwt1z1osCHEFwqlun9uwi81hN/a2n70hlTJgl1/9Ct2ZzH2g0oAYAy1wA5jGMPEBGhAePPi8xVO8eXln77k6/x+/L/VoS9wCIgFVERoqF/Hqe/fjYTLQ1WVaC1EQin3ifpHldk1dITfj3vs1ZhHJ3+Pio5BvN0b3N9n60oyC5gealcD6Poq7FEj0pPQlK6C0adjWvgWvhjlrfLxH08uQH2ykCCQbCR6gqsDKHHrTcU574PTLNcdm9SutH1KS+mwNQUZai2wM2OEM8jZ4+r8/slDXKiNnWCo88KIeUKyZVEatnMFZRr4Vg74cSzgun03pnIWXkGyYcxiGiwGUkzSuSkUfb8CDQR44/6VLynpTZEjJTG/lRLssR7R0k0Q/FMqGYk3gM+KGOkJSwmKp1P3CNatDSYJxfspYwl05YT93EnXizDMAdGoED79FZD08V1MtlCAVGiRiCggu5LsEO/xZQaTl/rPQEBsKZaWiiMPjAKpDOP3w86icOGVJVaJIDiObMJlm+UfVzZKWy33369NKf/HxqlGdc7sKtPLWNt6jiuYkVZPrfic8CLiJGSWCqN5RrN+U9S2hYaSmrzv44V+GFHz1c+1m/PuNnnqVXi0Wtzm57h9oOGWcGIomIkMno3VhQyggTAgHgsG5jeXXGcCkz5DiMxkztxYkhUl7vcP2Ccs0blybGDIWQ2eN7QhdzrkVZVtsExgnK3DTmI1BMOhlZFZKVmf5sUQTbkv4TrFzqDeea0Hy2vQSKokaLTK qaUbkI9a 2ZPb5B/lokn68cd/nN2rqS9gizGlVrfCU3BMhIjeHqc3yiY3kaVC3dFGk5zal/wFcVJTlka6J4lew0NjVzakD9S1MIzQ93BKOfpmOqtFLYBTw9N1aW7JSyRmMXg8TzjfptpXhLxsg5n5KqY1gu9CmUCq2B2Ti28Nl04wL4tHcWO5xIJEaf+yUlskAfElsz8dUePXwSwg/rfmCWXHyb2NCWP8wIHcyDE/jTPJc8ErwLIS+K7wbRnZtT3KuHCdrDoMuv3QtpCj7Xqmu+bevwt+FtRyxudz1gBRbLLWBmx5uk23sDq5ewCLhIukrfgE/a2/5huHSi0XFt6M0IuNOxzN9MeDOAijMfdm3d1Js6B4S1fkDmmAdezfuxC1Mh9bEFqawdEdLgYpgg2hGXGreqRcojXvDguCvkOa8qf2QT6hn8w4bXZmzrHivorN3Qi3FwrMY08hL 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 08.01.25 13:10, Heiko Carstens wrote: > On Wed, Jan 08, 2025 at 07:04:23AM -0500, Michael S. Tsirkin wrote: >> On Wed, Dec 04, 2024 at 01:54:31PM +0100, David Hildenbrand wrote: >>> The only "different than everything else" thing about virtio-mem on s390 >>> is kdump: The crash (2nd) kernel allocates+prepares the elfcore hdr >>> during fs_init()->vmcore_init()->elfcorehdr_alloc(). Consequently, the >>> kdump kernel must detect memory ranges of the crashed kernel to >>> include via PT_LOAD in the vmcore. >>> >>> On other architectures, all RAM regions (boot + hotplugged) can easily be >>> observed on the old (to crash) kernel (e.g., using /proc/iomem) to create >>> the elfcore hdr. >>> >>> On s390, information about "ordinary" memory (heh, "storage") can be >>> obtained by querying the hypervisor/ultravisor via SCLP/diag260, and >>> that information is stored early during boot in the "physmem" memblock >>> data structure. >>> >>> But virtio-mem memory is always detected by as device driver, which is >>> usually build as a module. So in the crash kernel, this memory can only be >>> properly detected once the virtio-mem driver started up. >>> >>> The virtio-mem driver already supports the "kdump mode", where it won't >>> hotplug any memory but instead queries the device to implement the >>> pfn_is_ram() callback, to avoid reading unplugged memory holes when reading >>> the vmcore. >>> >>> With this series, if the virtio-mem driver is included in the kdump >>> initrd -- which dracut already takes care of under Fedora/RHEL -- it will >>> now detect the device RAM ranges on s390 once it probes the devices, to add >>> them to the vmcore using the same callback mechanism we already have for >>> pfn_is_ram(). >>> >>> To add these device RAM ranges to the vmcore ("patch the vmcore"), we will >>> add new PT_LOAD entries that describe these memory ranges, and update >>> all offsets vmcore size so it is all consistent. >>> >>> My testing when creating+analyzing crash dumps with hotplugged virtio-mem >>> memory (incl. holes) did not reveal any surprises. >>> >>> Patch #1 -- #7 are vmcore preparations and cleanups >>> Patch #8 adds the infrastructure for drivers to report device RAM >>> Patch #9 + #10 are virtio-mem preparations >>> Patch #11 implements virtio-mem support to report device RAM >>> Patch #12 activates it for s390, implementing a new function to fill >>> PT_LOAD entry for device RAM >> >> Who is merging this? >> virtio parts: >> >> Acked-by: Michael S. Tsirkin > > I guess this series should go via Andrew Morton. Andrew? > > Acked-by: Heiko Carstens # s390 > Yes, it's in mm-unstable already for quite a while. Thanks for the acks! -- Cheers, David / dhildenb