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[47.55.120.4]) by smtp.gmail.com with ESMTPSA id af79cd13be357-89f24cd5617sm829595185a.19.2025.10.28.06.28.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Oct 2025 06:28:55 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1vDjkt-00000004PA5-0Sy6; Tue, 28 Oct 2025 10:28:55 -0300 Date: Tue, 28 Oct 2025 10:28:55 -0300 From: Jason Gunthorpe To: Jacob Pan Cc: Vipin Sharma , bhelgaas@google.com, alex.williamson@redhat.com, pasha.tatashin@soleen.com, dmatlack@google.com, graf@amazon.com, pratyush@kernel.org, gregkh@linuxfoundation.org, chrisl@kernel.org, rppt@kernel.org, skhawaja@google.com, parav@nvidia.com, saeedm@nvidia.com, kevin.tian@intel.com, jrhilke@google.com, david@redhat.com, jgowans@amazon.com, dwmw2@infradead.org, epetron@amazon.de, junaids@google.com, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [RFC PATCH 06/21] vfio/pci: Accept live update preservation request for VFIO cdev Message-ID: <20251028132855.GJ760669@ziepe.ca> References: <20251018000713.677779-1-vipinsh@google.com> <20251018000713.677779-7-vipinsh@google.com> <20251027134430.00007e46@linux.microsoft.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=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20251027134430.00007e46@linux.microsoft.com> On Mon, Oct 27, 2025 at 01:44:30PM -0700, Jacob Pan wrote: > I have a separate question regarding noiommu devices. I’m currently > working on adding noiommu mode support for VFIO cdev under iommufd. Oh how is that going? I was just thinking about that again.. After writing the generic pt self test it occured to me we now have enough infrastructure for iommufd to internally create its own iommu_domain with a AMDv1 page table for the noiommu devices. It would then be so easy to feed that through the existing machinery and have all the pinning/etc work. Then only an ioctl to read back the physical addresses from this special domain would be needed It actually sort of feels pretty easy.. Jason