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[142.68.80.239]) by smtp.gmail.com with ESMTPSA id c8-20020a0cf2c8000000b00698f7eb9997sm5233380qvm.54.2024.04.10.08.55.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Apr 2024 08:55:35 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.95) (envelope-from ) id 1ruaIR-008Fb1-2n; Wed, 10 Apr 2024 12:55:35 -0300 Date: Wed, 10 Apr 2024 12:55:35 -0300 From: Jason Gunthorpe To: Lu Baolu Cc: Joerg Roedel , Will Deacon , Robin Murphy , Kevin Tian , Tina Zhang , Yi Liu , iommu@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 09/12] iommu/vt-d: Use cache helpers in arch_invalidate_secondary_tlbs Message-ID: <20240410155535.GI223006@ziepe.ca> References: <20240410020844.253535-1-baolu.lu@linux.intel.com> <20240410020844.253535-10-baolu.lu@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240410020844.253535-10-baolu.lu@linux.intel.com> On Wed, Apr 10, 2024 at 10:08:41AM +0800, Lu Baolu wrote: > /* Pages have been freed at this point */ > static void intel_arch_invalidate_secondary_tlbs(struct mmu_notifier *mn, > struct mm_struct *mm, > unsigned long start, unsigned long end) > { > struct intel_svm *svm = container_of(mn, struct intel_svm, notifier); > + struct dmar_domain *domain = svm->domain; > > if (start == 0 && end == -1UL) { ULONG_MAX ideally. > - intel_flush_svm_all(svm); > + cache_tag_flush_all(domain); > return; > } > > - intel_flush_svm_range(svm, start, > - (end - start + PAGE_SIZE - 1) >> VTD_PAGE_SHIFT, 0); > + cache_tag_flush_range(domain, start, end, 0); Be mindful of the note from the ARM driver: /* * The mm_types defines vm_end as the first byte after the end address, * different from IOMMU subsystem using the last address of an address * range. So do a simple translation here by calculating size correctly. */ size = end - start; Given that the cache_tag_flush_range's are all tied directly to the iommu gather API, this is probably missing a -1 though perhaps it does not cause a functional problem here. Jason