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[2003:cb:c721:a000:7426:f6b4:82a3:c6ab]) by smtp.gmail.com with ESMTPSA id w21-20020a05600c475500b0040b2976eb02sm5902588wmo.10.2023.11.24.11.54.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 24 Nov 2023 11:54:14 -0800 (PST) Message-ID: Date: Fri, 24 Nov 2023 20:54:12 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v2 14/27] arm64: mte: Disable dynamic tag storage management if HW KASAN is enabled To: Alexandru Elisei , catalin.marinas@arm.com, will@kernel.org, oliver.upton@linux.dev, maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, arnd@arndb.de, akpm@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, mhiramat@kernel.org, rppt@kernel.org, hughd@google.com Cc: pcc@google.com, steven.price@arm.com, anshuman.khandual@arm.com, vincenzo.frascino@arm.com, eugenis@google.com, kcc@google.com, hyesoo.yu@samsung.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org References: <20231119165721.9849-1-alexandru.elisei@arm.com> <20231119165721.9849-15-alexandru.elisei@arm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: BB2032001F X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: zwhq538tukg1azpfxffycw7cy96gmq9a X-HE-Tag: 1700855658-218778 X-HE-Meta: U2FsdGVkX1+Pou1fSw2cPflpRLeT2/9BCCf9XvFmf1dmwx6byAx3ecdtAmJyzmbCgeBm9bydsqkkekAsPSUegFIP9IDt99kdu1Fg0eVF8aMkA4WnkV1MV770tuDsXG1atxqA5TqyTDRe4VKwhT32u57okZGKvlMs2ETfkYzcwdTunijiT8Bje4iKD+FZRwYXYnIEynh0thlLM37esW3YqjazPyHGppUQNVQbOw5Hpf/1GLNkAdgW1n/mYKdCjqPTOz5TbYAwWpM25zrFdIkRfAycAkQvw33sVNUm0U4ftqgNWMAp9KCw6Su/01FGTMjNkfsI5uDv4Q0gJ15dgipp+yBkasR8Xuh7eTTsejASjG4Bzx7A+CArhjbC32gYALeJhLm5RF1KFKZVfREyDRLZ10qZPLLASvQaIG8kuVhOhj1XnPETDpqtME5h6ishXdQwEk3TUZPC6YsyhJkVfFOZX7J70zdE52uJsiUshfAXqGwU3+5r1og+N8gBRMgPWXG6/ajkdVpvfMODRH+GQSlJHav/WY6al0kkVPu7+Q72q/XqXd0Rzldo8J+SR/DRuV0QMBUTmqnMIYfxNtoWiu1iAXECf5UQ9vQwcyIk1zVT0DVv3eoUKShVRVyXtWbnBJzggVwBu9olvEJSYS+4+RhDiex79AAnyUxlZPzwEfPUyn9axGtJRZGv1C9QCsl3jgkxc+ERhnGzI9xbdu1DDglZm3pl485N2AR248PWIB8iOO/b+3oILIiB4+bV+ag/2VKdzwXstS+M9OQkqbvaVyxilw5bsjNHKVyIklgyncUIERD6wfRpHVgmfU4L9iFcVPWxeHVYHgsT8SNAEa6hBqKY2CsKA50Axt/QxNwWImGV7LkalKTUACtA+4wU929sbN6rroSH+2VWJT/ibh7l8e2LNjKwSlHMNPpFRUALvsq3dPDLccmwhRsW7kQJLHINZ26fsaQkKKTJVlxbUJOqdFQ sqt30Sn9 C8dexiyZP6F2lixySRd770Tmks9swny5ej0y4Wqtvf0vsS0jhHayzJoD5jK9lP1LGMSGT1kQ0478WSi9KBNhXqOxg7nHelVtAsr+GhQJKWsjoGon/iim0TJyy5BOG1reyb4eX1+FB65pSkoGNNl9QTnA8gcFvr+CwsLPMsdX781/ooUKkYaAmvn3OpuK0o4O6QQvm3Pia3vrL1/ybBdL4z4+yDaTMwrnpJoKLm2q+Fz+d2sgRMOgmGCE/j6mXRF6ev5fOt12vZpUyAtuO58Jorb91YCycFPrFlPkR6spQnir4tD8Oerr6ol7WvAeofZOUaxiSI/7NR9Hwd+ZJaiBjw/fOOWo620vm3uP3WD21VWSUd93LGG6IcsQzrx5D5vCfNqUq5VI9FQMofw2uQ/epITlOOvBk9PBYt8JSi9ithUZCLjI= 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 19.11.23 17:57, Alexandru Elisei wrote: > To be able to reserve the tag storage associated with a page requires that > the tag storage page can be migrated. > > When HW KASAN is enabled, the kernel allocates pages, which are now tagged, > in non-preemptible contexts, which can make reserving the associate tag > storage impossible. I assume that it's the only in-kernel user that actually requires tagged memory (besides for user space), correct? -- Cheers, David / dhildenb