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Mon, 8 Dec 2025 09:00:01 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id cv2DNpGTNmlPfwAAD6G6ig (envelope-from ); Mon, 08 Dec 2025 09:00:01 +0000 Message-ID: <455f95e6-4301-4877-8d2b-548504f1823e@suse.cz> Date: Mon, 8 Dec 2025 10:00:01 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 03/13] mm: introduce AS_NO_DIRECT_MAP Content-Language: en-US To: "Kalyazin, Nikita" , "kvm@vger.kernel.org" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "kvmarm@lists.linux.dev" , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" , "bpf@vger.kernel.org" , "linux-kselftest@vger.kernel.org" Cc: "pbonzini@redhat.com" , "corbet@lwn.net" , "maz@kernel.org" , "oupton@kernel.org" , "joey.gouly@arm.com" , "suzuki.poulose@arm.com" , "yuzenghui@huawei.com" , "catalin.marinas@arm.com" , "will@kernel.org" , "seanjc@google.com" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "x86@kernel.org" , "hpa@zytor.com" , "luto@kernel.org" , "peterz@infradead.org" , "willy@infradead.org" , "akpm@linux-foundation.org" , "david@kernel.org" , "lorenzo.stoakes@oracle.com" , "Liam.Howlett@oracle.com" , "rppt@kernel.org" , "surenb@google.com" , "mhocko@suse.com" , "ast@kernel.org" , "daniel@iogearbox.net" , "andrii@kernel.org" , "martin.lau@linux.dev" , "eddyz87@gmail.com" , "song@kernel.org" , "yonghong.song@linux.dev" , "john.fastabend@gmail.com" , "kpsingh@kernel.org" , "sdf@fomichev.me" , "haoluo@google.com" , "jolsa@kernel.org" , "jgg@ziepe.ca" , "jhubbard@nvidia.com" , "peterx@redhat.com" , "jannh@google.com" , "pfalcato@suse.de" , "shuah@kernel.org" , "riel@surriel.com" , "baohua@kernel.org" , "ryan.roberts@arm.com" , "jgross@suse.com" , "yu-cheng.yu@intel.com" , "kas@kernel.org" , "coxu@redhat.com" , "kevin.brodsky@arm.com" , "ackerleytng@google.com" , "maobibo@loongson.cn" , "prsampat@amd.com" , "mlevitsk@redhat.com" , "isaku.yamahata@intel.com" , "jmattson@google.com" , "jthoughton@google.com" , "linux-arm-kernel@lists.infradead.org" , "vannapurve@google.com" , "jackmanb@google.com" , "aneesh.kumar@kernel.org" , "patrick.roy@linux.dev" , "Thomson, Jack" , "Itazuri, Takahiro" , "Manwaring, Derek" , "Cali, Marco" References: <20251205165743.9341-1-kalyazin@amazon.com> <20251205165743.9341-4-kalyazin@amazon.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <20251205165743.9341-4-kalyazin@amazon.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 56FD112001C X-Stat-Signature: hkbt41yud9gdhuqiimbepg5ne5nx9yhp X-Rspam-User: X-HE-Tag: 1765184404-537868 X-HE-Meta: U2FsdGVkX19+KlnMlgiLwPlX51cYK1QaLz5ug9cOA6MH2zP/ceB54KLnQXcMRYWPsSMtnSKJW1IIOUZI0fh4Z4Oh/R+8vJjSE7nfxo5VA6pv9JKhTGWHnroJi2b0kRc94lZX/A+dtk2n1N6WXfLsO6jduPxAPiI4AaDnYX4dFW65XHblJei7yiQFjbaDQNC9ZQetyLXFwrYhMHoXWmZV+QF00Uisq/Zx8dL5lfhgyrcdUMHL7721rZgsqINBTFDDYRgFFdWfuGswvdLvUSnvd9AsIm1vmbDM/as7bb0yNVqyn1Q8vNSi1ixW4cdyF24PJrbmvcOM7zFMMtgP8UnzX20gEek3x4Ui5mrnYFd/ygvHGpneGaOu1GGIg7jZiKjz2aPTe1B9GfipvqgZD0xmRQpRzeiQaB186uActXHFAKX5xhAbtgipZY06DJSJrsyWcOml9J9Uu7LTRxFVNZ7Jp220MJrXcelELelHYv6CcnJLV1UNhPzuA3/X4sTPdY+cuMB9QuKtoKKVonxc6zpcHMRlf+Sv/egAGa/81rRnMzepDgQET3Zu+qjYqp1A/Pc42T0l0/jHcysKDtF9IkbxIO/McYCBK8/9t9GHitZoNWMqHPtbDxukY1RzBXYlMUoL9ZR6G4HW98C29owcZJWi+KP2+kmCdPkbVPExbXiqwReMgnZFfVYAUr3LVqVkF6rKkQmoC3uiA/Mm/Blvd91QyyCeHn7OsUF6XwS3pQHVvdUG6dYjQrWUDMVeOl4uOD2Ff7tUXP5/QwbK8j0f/qFu8c5+4w5zxQo77HHWNMBesVOC8c5WvB5UIwRpRYQyatZVfItVmrJbbMqm+oqFyIT8L/Q+ojuhBNZFF1dnzhOJp9RjnwowJaDV8/a8UQCtLMNgcjmJyz+hJ6qTjrHQ9McTYcZ2Sa2262aCYI+7Rh2ryXiBaL0DPHdE7FwTB+W/xdgozU2+cRjTiJ8xuMLu+VZ Xzr6iPQW 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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 12/5/25 17:58, Kalyazin, Nikita wrote: > From: Patrick Roy > > Add AS_NO_DIRECT_MAP for mappings where direct map entries of folios are > set to not present. Currently, mappings that match this description are > secretmem mappings (memfd_secret()). Later, some guest_memfd > configurations will also fall into this category. > > Reject this new type of mappings in all locations that currently reject > secretmem mappings, on the assumption that if secretmem mappings are > rejected somewhere, it is precisely because of an inability to deal with > folios without direct map entries, and then make memfd_secret() use > AS_NO_DIRECT_MAP on its address_space to drop its special > vma_is_secretmem()/secretmem_mapping() checks. > > This drops a optimization in gup_fast_folio_allowed() where > secretmem_mapping() was only called if CONFIG_SECRETMEM=y. secretmem is > enabled by default since commit b758fe6df50d ("mm/secretmem: make it on > by default"), so the secretmem check did not actually end up elided in > most cases anymore anyway. > > Use a new flag instead of overloading AS_INACCESSIBLE (which is already > set by guest_memfd) because not all guest_memfd mappings will end up > being direct map removed (e.g. in pKVM setups, parts of guest_memfd that > can be mapped to userspace should also be GUP-able, and generally not > have restrictions on who can access it). > > Acked-by: Mike Rapoport (Microsoft) > Acked-by: David Hildenbrand (Red Hat)" > Signed-off-by: Patrick Roy > Signed-off-by: Nikita Kalyazin Acked-by: Vlastimil Babka