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[47.55.120.4]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8be31b55a32sm72625785a.28.2025.12.15.16.58.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Dec 2025 16:58:35 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1vVJOc-000000008ML-3OBX; Mon, 15 Dec 2025 20:58:34 -0400 Date: Mon, 15 Dec 2025 20:58:34 -0400 From: Jason Gunthorpe To: Mostafa Saleh Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, iommu@lists.linux.dev, catalin.marinas@arm.com, will@kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, joro@8bytes.org, jean-philippe@linaro.org, praan@google.com, danielmentz@google.com, mark.rutland@arm.com, qperret@google.com, tabba@google.com Subject: Re: [PATCH v5 04/27] iommu/io-pgtable-arm: Factor kernel specific code out Message-ID: <20251216005834.GC31492@ziepe.ca> References: <20251117184815.1027271-1-smostafa@google.com> <20251117184815.1027271-5-smostafa@google.com> <20251128164541.GA812105@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251215_165837_787153_34C19FDF X-CRM114-Status: GOOD ( 16.93 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Dec 12, 2025 at 03:37:43PM +0000, Mostafa Saleh wrote: > On Fri, Nov 28, 2025 at 12:45:41PM -0400, Jason Gunthorpe wrote: > > On Mon, Nov 17, 2025 at 06:47:51PM +0000, Mostafa Saleh wrote: > > > Some of the used APIs are only part of the kernel and are not > > > available in the hypervisor, factor those out: > > > - alloc/free memory > > > > Why not provide the iommu-pages API for the hypervisor environment? > > > > Same for virt_to_phys, that could be moved into an iommu-pages wrapper > > too.. > > I guess that's possible, but then we would have to stub dma_map/unmap, > which might a bit ugly. I will look more into it. I am hoping to drop the dma_map/unmap and replace it with an arch cache flush call directly since the code is no longer modular and relying on the DMA API will have some problems with a future patch series I'm expecting.. Jason