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Shutemov" , "Pan, Jacob jun" CC: "Raj, Ashok" , "Kirill A. Shutemov" , Ashok Raj , Dave Hansen , "Lutomirski, Andy" , "Peter Zijlstra" , "x86@kernel.org" , "Kostya Serebryany" , Andrey Ryabinin , Andrey Konovalov , Alexander Potapenko , Taras Madan , Dmitry Vyukov , "H . J . 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arc=pass ("microsoft.com:s=arcselector9901:i=1"); spf=pass (imf11.hostedemail.com: domain of kevin.tian@intel.com designates 192.55.52.151 as permitted sender) smtp.mailfrom=kevin.tian@intel.com; dmarc=pass (policy=none) header.from=intel.com X-Stat-Signature: 8hoysrhwc9wrerx3yegcnozb1pdbannz X-Rspamd-Queue-Id: DE66240019 X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1663752998-330500 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: > From: Kirill A. Shutemov > Sent: Friday, September 16, 2022 1:29 AM >=20 > I really struggle with naming here. Any suggestions on what XXX has to be > replaced with? I don't think it has to be limited to LAM as some other > tagging implementation may come later. What about ARCH_ENABLE_TAGGED_ADDR_CPU to mark that the application tags address only on CPU and pays attention to untag when the address is programmed to a device? w/ ARCH_ENABLE_TAGGED_ADDR_CPU then LAM and SVA can co-exist. The original ARCH_ENABLE_TAGGED_ADDR means that tagged address is used on both CPU and device. Enabling sva on a device behind an iommu which doesn't support LAM is then rejected if LAM has been enabled. and vice versa. Thanks Kevin