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Mon, 04 May 2020 07:24:40 -0700 (PDT) MIME-Version: 1.0 References: <20200430143424.2787566-1-jean-philippe@linaro.org> <20200430143424.2787566-20-jean-philippe@linaro.org> In-Reply-To: <20200430143424.2787566-20-jean-philippe@linaro.org> From: Prabhakar Kushwaha Date: Mon, 4 May 2020 19:54:03 +0530 Message-ID: Subject: Re: [PATCH v6 19/25] iommu/arm-smmu-v3: Add support for Hardware Translation Table Update To: Jean-Philippe Brucker Cc: iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-arm-kernel , linux-pci@vger.kernel.org, linux-mm@kvack.org, joro@8bytes.org, Catalin Marinas , Will Deacon , Robin Murphy , kevin.tian@intel.com, baolu.lu@linux.intel.com, Jonathan.Cameron@huawei.com, jacob.jun.pan@linux.intel.com, christian.koenig@amd.com, felix.kuehling@amd.com, zhangfei.gao@linaro.org, jgg@ziepe.ca, xuzaibo@huawei.com, fenghua.yu@intel.com, hch@infradead.org, Ganapatrao Prabhakerrao Kulkarni , tanmay@marvell.com Content-Type: text/plain; charset="UTF-8" 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: Dear Jean, On Thu, Apr 30, 2020 at 8:11 PM Jean-Philippe Brucker wrote: > > If the SMMU supports it and the kernel was built with HTTU support, enable is there any framework/config for HTTU which must be enabled to use this patch? > We can enable HTTU even if CPUs don't support it, because the kernel > always checks for HW dirty bit and updates the PTE flags atomically. > I believe, this statement is valid in context of this patch-set only. One cannot use code snipped to test HTTU because exiting io-pgtable-arm.c driver doesn't have framework to leverage HTTU benfits. It by-default sets AF=1 and does not set DBM. Thanks --pk