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
