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[2003:cb:c72e:e400:431d:9c08:5611:693c]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38bf32845e8sm11477196f8f.97.2025.01.20.11.32.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Jan 2025 11:32:59 -0800 (PST) Message-ID: <378ab76e-6f31-4ef4-b4bc-7c78cc307875@redhat.com> Date: Mon, 20 Jan 2025 20:32:57 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 01/12] x86/mm: make MMU_GATHER_RCU_TABLE_FREE unconditional To: Rik van Riel , x86@kernel.org Cc: linux-kernel@vger.kernel.org, bp@alien8.de, peterz@infradead.org, dave.hansen@linux.intel.com, zhengqi.arch@bytedance.com, nadav.amit@gmail.com, thomas.lendacky@amd.com, kernel-team@meta.com, linux-mm@kvack.org, akpm@linux-foundation.org, jannh@google.com, mhklinux@outlook.com, andrew.cooper3@citrix.com References: <20250120024104.1924753-1-riel@surriel.com> <20250120024104.1924753-2-riel@surriel.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: <20250120024104.1924753-2-riel@surriel.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: visbBziza80_eoqwDxnn9C-nyQmRN39Wyx26citqN64_1737401581 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: rspam09 X-Rspamd-Queue-Id: 273351C0010 X-Stat-Signature: puo4mbj39fbi383nyhgffprydw7jk8if X-HE-Tag: 1737401586-457482 X-HE-Meta: U2FsdGVkX1+uDgeTjvmdOmWB41J265hNLxMzDYxTP5HBkkLkpWl8KCDdbUh4Ufm8Cs9I4LX7u2vFfDwRe92nXxdsgIZS1idlHHTXbOPMxFMdQ7Tcu3TLRFC+2Bttfpl68FfPrnolNoz1Go755anMuqXnbpjTEn2jlynzQUQ9CBwtQiWHABDvQgChxnsPnkpHVNl/fav9VkV3utWOT35empxX+3YEyEgiY8rgb7njDQncZNl7Q2RLIZ1w6ZWErRdm2rtTBlf9/S8o7eqDlCiMFO5j0R/FGLQhGbvbt6QgmEIVWEW07ArqBOM01LBe82yK4vLQlXF9I0QRVKf4pPPPqXhlt53lKNmFlhM+H+Vj38PGwB3KN/h/hee6VJ57wu0Ye94mq4AzOcZpC2NlhCH6EucOqIB1vYmKb16c9RAF3Uvb1Job8oKPPkhr6h0JG7HgUt/2KMrvaQ2Mm3COK8sVzlG5oSbY8PkUu0JwPD929zIRqQSvv6E+F1Z3zPxYleG2bsksgxV8TOk+CHLlakWTIiku4vqsJRkzEHt3X1dwoU1ok4PstKUr10pE6WorajugB6G5TyXdoB++JBSw1gGhCv8sQV73pn2p02fPAusvCGLwkO0XQpG4Q5DU3o6GA3/OFeFqWOw5mNqi/MqK45wE0LkwwKOxezRldorqbwigFzb1XpPU5fGCdFC38Y3KjsofcwbY+H4SyXfHgkCwALUlQKNGjNsGGb0+xxUqeTkmZnX2QoT3fyy7pmJPqsA8WPiBC97U+vNvz1Km21e8yPObEq88RlmPIvnBWPEBUVsqqa2w+OjwmfGOZn1pKZ2UX1mCV0PbPSEVS2cXQaeZEfjVXVZtDnC8vXHYLoCvNYxXcEh7RUWhEkUDBDQnCHxadb1ct1vz1MtB7dEeBWRPHOtzCaV7tzdjJ7fe0ukDXvrolbdnmFqaBun9bc05RLkjYnvgfFz8Ka8tmIy9nZKQiaL gUiAmrET 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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 20.01.25 03:40, Rik van Riel wrote: > Currently x86 uses CONFIG_MMU_GATHER_TABLE_FREE when using > paravirt, and not when running on bare metal. > > There is no real good reason to do things differently for > each setup. Make them all the same. > > Currently get_user_pages_fast synchronizes against page table > freeing in two different ways: > - on bare metal, by blocking IRQs, which block TLB flush IPIs > - on paravirt, with MMU_GATHER_RCU_TABLE_FREE Right, worth noting the latter also right now relies on the blocking of IRQs that is in place, because they implicitly block the RCU sync. Reviewed-by: David Hildenbrand -- Cheers, David / dhildenb