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Wed, 17 Sep 2025 08:59:32 -0700 (PDT) Received: from ziepe.ca ([130.41.10.202]) by smtp.gmail.com with ESMTPSA id 5614622812f47-43b828d6909sm4320090b6e.7.2025.09.17.08.59.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Sep 2025 08:59:32 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1uyuZ9-00000008UmV-28J5; Wed, 17 Sep 2025 12:59:31 -0300 Date: Wed, 17 Sep 2025 12:59:31 -0300 From: Jason Gunthorpe To: Will Deacon Cc: Mostafa Saleh , linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, robin.murphy@arm.com, jean-philippe@linaro.org, qperret@google.com, tabba@google.com, mark.rutland@arm.com, praan@google.com Subject: Re: [PATCH v4 22/28] iommu/arm-smmu-v3-kvm: Emulate CMDQ for host Message-ID: <20250917155931.GI1326709@ziepe.ca> References: <20250819215156.2494305-1-smostafa@google.com> <20250819215156.2494305-23-smostafa@google.com> <20250915163858.GK882933@ziepe.ca> <20250917123601.GA1326709@ziepe.ca> <20250917151612.GH1326709@ziepe.ca> 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: On Wed, Sep 17, 2025 at 04:25:35PM +0100, Will Deacon wrote: > Ah right, so the driver would unnecessarily issue CMOs for the structures > that are just shared with the hypervisor. At least it's _functional_ that > way, but I'm sure people will complain! Yes, functional, why would anyone complain? STE and CD manipulation is not fast path for anything? Jason