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Shutemov" Cc: Ashok Raj , Dave Hansen , Jacob Pan , "Kirill A. Shutemov" , Ashok Raj , Dave Hansen , Andy Lutomirski , Peter Zijlstra , x86@kernel.org, Kostya Serebryany , Andrey Ryabinin , Andrey Konovalov , Alexander Potapenko , Taras Madan , Dmitry Vyukov , "H . J . Lu" , Andi Kleen , Rick Edgecombe , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joerg Roedel Subject: Re: [PATCHv8 00/11] Linear Address Masking enabling Message-ID: References: <20220914165116.24f82d74@jacob-builder> <20220915090135.fpeokbokkdljv7rw@box.shutemov.name> <20220915172858.pl62a5w3m5binxrk@box.shutemov.name> <562dec4d-a39f-b517-58a3-45f691a2d10a@intel.com> <20220923004239.ma2gfrmoezsff4ro@box.shutemov.name> <20220923093826.kjad4qe3clwybeh6@box.shutemov.name> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220923093826.kjad4qe3clwybeh6@box.shutemov.name> X-ClientProxiedBy: BL0PR0102CA0019.prod.exchangelabs.com (2603:10b6:207:18::32) To MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN2PR12MB4192:EE_|CH0PR12MB5154:EE_ X-MS-Office365-Filtering-Correlation-Id: 36882971-4542-4222-dab3-08da9d59339d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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dkim=pass header.d=Nvidia.com header.s=selector2 header.b=EG+SIWqI; dmarc=pass (policy=reject) header.from=nvidia.com; spf=pass (imf31.hostedemail.com: domain of jgg@nvidia.com designates 40.107.93.49 as permitted sender) smtp.mailfrom=jgg@nvidia.com; arc=pass ("microsoft.com:s=arcselector9901:i=1") X-Stat-Signature: bnb5o9n74qogr1iiax4hntiaczezsgm1 X-HE-Tag: 1663933569-72079 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: On Fri, Sep 23, 2022 at 12:38:26PM +0300, Kirill A. Shutemov wrote: > > So I would assume an untagged pointer should just be fine for the IOMMU > > to walk. IOMMU currently wants canonical addresses for VA. > > Right. But it means that LAM compatibility can be block on two layers: > IOMMU and device. IOMMU is not the only HW entity that has to be aware of > tagged pointers. Why does a device need to care about this? What do you imagine a device doing with it? The userspace should program the device with the tagged address, the device should present the tagged address on the bus, the IOMMU should translate the tagged address the same as the CPU by ignoring the upper bits. Jason