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[2003:cb:c708:1d00:99ec:9656:7475:678d]) by smtp.gmail.com with ESMTPSA id d21-20020adf9b95000000b003316ad360c1sm15738401wrc.24.2023.11.28.09.05.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 28 Nov 2023 09:05:42 -0800 (PST) Message-ID: Date: Tue, 28 Nov 2023 18:05:41 +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 Cc: 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, 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: 850C7400EC X-Rspam-User: X-Stat-Signature: wzy1f5ebeuo5dnw1cdhxxskanpk87uhh X-Rspamd-Server: rspam03 X-HE-Tag: 1701191147-973390 X-HE-Meta: U2FsdGVkX18NNP84kyRklFmb/1eILnAcmmLjMLILeeVPKbmEqBcJW8jzgZEWlTEdTisiCEOvrZDL8QNyuZYEzifx/zSkLMNQnHdKgJ+6dp3Cbm4i+PV0Y055rqnPTB/+lauNs61g70bnhcjsor3LDIOmqKxmIfxrxpxiAfJgxhDHsC7BLLeBFovS87q78K56NsIY6wsko0Wu/q3LaWlcoNi+nPfRjUX9gav+w10Y9C3wwMwSY0b5XBxi9wOhEfw1j1BOvX4OL6ZvLd2Qq7+EF2k3KRrZ0vGjrdEVX/zQPE1W2aq94VtFY9utBEbQaHJCbVS19c9oHs89d7gwi8lYXAHquhCqPsW2Im15wJF/0yiQcXo/lutwZqkQ/l8Nc0aU2JOmBl4epmaoKHJn01Kska0hn5cF3WNMCGZbe7TCbzoqaLvJ9mQYexYcGehHhhCtLu7hVYzj1L3s3e6g/ZjHLKgIfYG/LTkKEQRA5OVTikmNWAnuYhIPZuGka0Md1WhRa6YbefJJwi0py9FKSDycY+reSmxniK+bMk0rUq9J2qRglPVXXC9mI/m441qfj82m1GS4//hZcxrHjk8ON+9CPjdTxKQ5oZ5J1Y7Gu1G1lMasQCOvqRSxDFikAk1zWsWao82wdvozthfjKH7oQ0SomZDI5IL8HLEZVlx5PHgoYXIrShH95Wm7QCfVMU4z3EZo+a7ABsYUVMdhyZHpj8FyCHfUoEO+RR2B1uPpXpV1QaudQpEg+y3jHod4CgDEnTwRLr3FuEwCaXa8UZF6D48dxx/GnXPyYPbIU8b9pNJNJvqnDNU920kkUqJLG4DIOZhuxVoQ//SToKBMYBGbxFMCrzVB2PFlzqziqRui+cK9LgxYuS0GZ3xePnFBAJ+lGptbKKhgTbOWHU4+EHjEDgWnv6+S8+cFj9WB7o14+SuegiT+hosrx/QgXXCIA2vc6OCVNEIKWxaoeIyg0KgyyqX V5aVDGnm t8qyWJgja9TMqnX3LaobP3BEnymd4pdFOEJ44L3qtZXnhjKa+B7KIe4KeOt/e+tp55uY6gWb0UNf/7A7lCgy0S3lVA9ZV21Px1ZRajSgSFHd6hArnUWUQSciVf0IDxsZXP+BxfOI3PQiXIuBlUwdgo++J+Y8LbQBWJ7uFNhpU24zKsXFH3/FwS2fXtPPJjiYPyilG7Vxx8GYVlcTKOosWfW0Nn7svVrhho5DQK6mdmBvyyHTiizf/XN8ONID3fIVvZgOAYc67iezDVGhq2XSWkaw25SjGOxDwwEwpgJrWOIU5K+CJOBGzdwhMFZnnNLqnyB5KBl2Mou6bMoGNmPh7Q48Il6cvazFJ33Hw39Bm5uxXdn0ii/i3Z/jRb50EJASajpSBywF07pUekLHr7WOnG8PM3sm0kgge4ZOzHO/xYRT9vpA= 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 27.11.23 16:07, Alexandru Elisei wrote: > Hi, > > On Fri, Nov 24, 2023 at 08:54:12PM +0100, David Hildenbrand wrote: >> 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? > > Indeed, this is the case. I'll expand the commit message to be more clear about > it. > Great, thanks! -- Cheers, David / dhildenb