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[142.68.128.5]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7c00a8bca3bsm130417385a.13.2025.01.30.16.36.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Jan 2025 16:36:18 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1tdf18-00000009rfr-0aTF; Thu, 30 Jan 2025 20:36:18 -0400 Date: Thu, 30 Jan 2025 20:36:18 -0400 From: Jason Gunthorpe To: Shyam Saini Cc: Jacob Pan , iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, virtualization@lists.linux.dev, will@kernel.org, eric.auger@redhat.com, code@tyhicks.com, eahariha@linux.microsoft.com, vijayb@linux.microsoft.com Subject: Re: [PATCH 0/3] make MSI IOVA base address and its length configurable Message-ID: <20250131003618.GB2296753@ziepe.ca> References: <20250116232307.1436693-1-shyamsaini@linux.microsoft.com> <20250120142643.GM674319@ziepe.ca> <67901659.170a0220.20b206.f1f5SMTPIN_ADDED_BROKEN@mx.google.com> <20250122001924.GT674319@ziepe.ca> <20250130232137.GA14836@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250130232137.GA14836@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net> On Thu, Jan 30, 2025 at 03:21:37PM -0800, Shyam Saini wrote: > Unfortunately, it is an HW issue. Well, that's pretty bad to have built HW that can't DMA to low addresses at all.. But OK. > Are you okay with this passing custom MSI_IOVA via DTS approach ? It isn't up to me, but I've understood the DT maintainers would reject this as it isn't is describing HW but just a random Linux software knob. I think you should make selecting the sw_msi dynamic in Linux. Jason