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Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , Peter Zijlstra , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Vlastimil Babka , Will Deacon , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org References: <20251015082727.2395128-1-kevin.brodsky@arm.com> <20251015082727.2395128-12-kevin.brodsky@arm.com> <348e5f1c5a90e4ab0f14b4d997baf7169745bf04.camel@infradead.org> <70723f4a-f42b-4d94-9344-5824e48bfad1@redhat.com> <3ff4aaeb-61ce-4b72-ba90-1b66374b1b95@gmail.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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <3ff4aaeb-61ce-4b72-ba90-1b66374b1b95@gmail.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 1mdhcM5o9y0-b3p7cuB9hRQUEUvejV_3gQ0GyAljXpY_1761568166 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Stat-Signature: oobutosrdhb3zojj1e4xurg3z1z1iufw X-Rspam-User: X-Rspamd-Queue-Id: C13BDC0013 X-HE-Tag: 1761568168-306041 X-HE-Meta: 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 9lxQabx3 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 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 25.10.25 00:52, Demi Marie Obenour wrote: > On 10/24/25 10:51, David Hildenbrand wrote: >> On 24.10.25 16:47, David Woodhouse wrote: >>> On Thu, 2025-10-23 at 22:06 +0200, David Hildenbrand wrote: >>>> On 15.10.25 10:27, Kevin Brodsky wrote: >>>>> We currently set a TIF flag when scheduling out a task that is in >>>>> lazy MMU mode, in order to restore it when the task is scheduled >>>>> again. >>>>> >>>>> The generic lazy_mmu layer now tracks whether a task is in lazy MMU >>>>> mode in task_struct::lazy_mmu_state. We can therefore check that >>>>> state when switching to the new task, instead of using a separate >>>>> TIF flag. >>>>> >>>>> Signed-off-by: Kevin Brodsky >>>>> --- >>>> >>>> >>>> Looks ok to me, but I hope we get some confirmation from x86 / xen >>>> folks. >>> >>> >>> I know tglx has shouted at me in the past for precisely this reminder, >>> but you know you can test Xen guests under QEMU/KVM now and don't need >>> to actually run Xen? Has this been boot tested? >> >> And after that, boot-testing sparc as well? :D >> >> If it's easy, why not. But other people should not suffer for all the >> XEN hacks we keep dragging along. > > Which hacks? Serious question. Is this just for Xen PV or is HVM > also affected? In the context of this series, XEN_LAZY_MMU. Your question regarding PV/HVM emphasizes my point: how is a submitter supposed to know which XEN combinations to test (and how to test them), to not confidentially break something here. We really need guidance+help from the XEN folks here. -- Cheers David / dhildenb