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[80.187.80.144]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-46e611970easm40105015e9.2.2025.10.02.00.35.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 02 Oct 2025 00:35:03 -0700 (PDT) Message-ID: Date: Thu, 2 Oct 2025 09:34:59 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 00/21] mm: ASI direct map management To: Dave Hansen , Brendan Jackman , Andy Lutomirski , Lorenzo Stoakes , "Liam R. Howlett" , Suren Baghdasaryan , Michal Hocko , Johannes Weiner , Zi Yan , Axel Rasmussen , Yuanchu Xie , Roman Gushchin Cc: peterz@infradead.org, bp@alien8.de, dave.hansen@linux.intel.com, mingo@redhat.com, tglx@linutronix.de, akpm@linux-foundation.org, derkling@google.com, junaids@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, reijiw@google.com, rientjes@google.com, rppt@kernel.org, vbabka@suse.cz, x86@kernel.org, Yosry Ahmed References: <20250924-b4-asi-page-alloc-v1-0-2d861768041f@google.com> <00e7ff5e-fe6c-4edc-9bf8-2352321f74dc@intel.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: <00e7ff5e-fe6c-4edc-9bf8-2352321f74dc@intel.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: JZtd8n70Cr6FfDd6j_l9o-yURRM0A1JpHGnt14e8jrw_1759390504 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: 92866140004 X-Stat-Signature: 4ydoipca3ei8e7gqktcjw68yjc3dsqur X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1759390507-989274 X-HE-Meta: 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 uky0CWR0 zuO00FF09MN2G6XQnU+l1FlnDCRJPwC7oPnjiPX32BHgernQQnMR99JeZ60o92A8+UR5IxKiLRBp+PakA+/cFuarNUdRugKs2Zvjkh6yU47RBS9XNGF6piiYNYdTxxayhwm8Hctb5RPCYVLWum0vollcp1V4nr2I5PskhOIWQvK43RjwwR23mRJQo3ycDPx55Bbmx1zuBPLOEQLniUKRTVFxKwV3nlA1t2QVcNHZOd8icpSvpy2w+2zwnPpHSzkZdt5C+w/01qnlNsLDF3Rsvse39JDf3Sz8qWBwE0cncQO1aI9OXdcjoU8Q8UHsf0Bzycz8nMHgtKW3XPCS6uPWrfHrYxxJXA9pvU9HD1LdMeKjJktLu8xJP/+f5LEmPOEBNOgfuWGXNn4cT5B4= 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 01.10.25 22:59, Dave Hansen wrote: > On 9/24/25 07:59, Brendan Jackman wrote: >> Why is this the scope of the first series? The objective here is to >> reach a MVP of ASI that people can actually run, as soon as possible. > > I had to ask ChatGPT what you meant by MVP. Minimum Viable Product? > > So this series just creates a new address space and then ensures that > sensitive data is not mapped there? To me, that's a proof-of-concept, > not a bit of valuable functionality that can be merged upstream. > > I'm curious how far the first bit of functionality that would be useful > to end users is from the end of this series. There was this mail "[Discuss] First steps for ASI (ASI is fast again)"[1] that I also didn't get to fully digest yet, where there was a question at the very end " Once we have some x86 maintainers saying "yep, it looks like this can work and it's something we want", I can start turning my page_alloc RFC [3] into a proper patchset (or maybe multiple if I can find a way to break things down further). ... So, x86 folks: Does this feel like "line of sight" to you? If not, what would that look like, what experiments should I run? " Unless I am missing something, no x86 maintainer replied to that one so far and I assume this patch set here is the revival of above mentioned RFC " so it might be reasonable to reply there. [1] https://lore.kernel.org/all/20250812173109.295750-1-jackmanb@google.com/T/#u -- Cheers David / dhildenb