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(p200300d82f4e3200c99da38b3f3ad4b3.dip0.t-ipconnect.de. [2003:d8:2f4e:3200:c99d:a38b:3f3a:d4b3]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-475c4342946sm113034495e9.10.2025.10.23.13.06.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 23 Oct 2025 13:06:16 -0700 (PDT) Message-ID: Date: Thu, 23 Oct 2025 22:06:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 11/13] x86/xen: use lazy_mmu_state when context-switching To: Kevin Brodsky , linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Alexander Gordeev , Andreas Larsson , Andrew Morton , Boris Ostrovsky , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , "David S. Miller" , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Juergen Gross , "Liam R. 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> 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: <20251015082727.2395128-12-kevin.brodsky@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: I5yBmVJBRIO3OIlzMYvJJoWHFPoJP0FscrEEo7BTcAw_1761249978 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: E86C4180004 X-Stat-Signature: kti3aen1myyrqkgn3ixi41pwn4zwqdwc X-HE-Tag: 1761249981-496074 X-HE-Meta: U2FsdGVkX1+NATStoPxez0Xn7rCfjlnpG7N0iCvkQpb5RyKHcIIgYNfjYJmM60zb72NJk34KPX4XMhR7dabpKdKG+npcfrjNZ9LFp2cHdEgz1BkbMYM1vDbYJ5ci0CAguOOOnHj8BnnrY3P0+Vyjjhalt2zethFn/6dxQCjp1M1Bj7V0e73Ltwd+1UDPyCAQ18oVw2DjEetkcee7qomY1LeE0wWUlzTU98HHxEV+an1upnWRil8uQGoTP+GQossDuNRPteDO7M6gagZGTgJVuZ/CwNMuQJBZgQZdqZOC3/yP4BN2UqfYEIMlhQ0EGNZYh+d5SVNelQp+/EEZWGMxb7+Tqq2UT04dI7STTM+dP4DmzY9qPgM2obDRbddIHC8XH24UkLQBxQLdk5qpB7t4c3nu2szicxnpX7b3iHj2xyKDCw/iiurl0oKd7UHCTS29IMsOQsTvTJRwFk8OUwYlhYMlJwM2XcTBwhqWwsNX1kl54xlKKlTcNvZj6A4KmNmXIw3bRxipVhRb4hh6OGuWsejgpQFDTFFufHmi9JCqeMwLCSLGau3/JXPkgfI9CAcIdqvytJS2pg3tKgPGvtlu5PzPOBnj9+dYOtyB2jJbFQswUAh3mRMMUpeQ7mMLEak4LxukGZpGogl8qNiMM3KCiayfaM9BLsj7rxGQErZO5R35PC3aBaEztkMTMMmKQ0zNajVh+z7XSSdEwqkZq/C7LtHtFexhQcHQAxxIk7IYsUcfv1B5nv4258vODGadOBNunpR8U2Hp7qt5EzNCF+o6vEFWFO8jmad/ZFkCAS9F8wLBFj4voDPllyykspHHk6DHO7jXrmo5eEuBmAV/4OZqlz1LHBtjS+MmmDQHex9Mf/KY0XMuTc5h8GB7PMQfIHatHE4S4BnjYnwEPCSQi/3I6DTksTK/J+7wBuce4LiJfAMLtV8r8/lL2+1IF5cLFcsn7JgRjtJ0rR1sNOn7yuE +4eIjGE9 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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 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. -- Cheers David / dhildenb