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envelope-from=jgg@nvidia.com; helo=NAM10-MW2-obe.outbound.protection.outlook.com X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.483, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Fri, May 03, 2024 at 04:04:25PM +0200, Cédric Le Goater wrote: > However, have you considered another/complementary approach which > would be to create an host IOMMU (iommufd) backend object and a vIOMMU > device object together for each vfio-pci device being plugged in the > machine ? > > Something like, > -device pcie-root-port,port=23,chassis=8,id=pci.8,bus=pcie.0 \ > -object iommufd,id=iommufd1 \ > -device intel-iommu,intremap=on,device-iotlb=on,caching-mode=on,iommufd=iommufd1 \ > -device vfio-pci,host=0000:08:10.0,bus=pci.1,iommufd=iommufd0 ? The main point of this is to have a single iommufd FD open in qemu. Not multiple. Would you achieve this with a iommufd0 and iommufd1 ? Jason