Hi, I have a PCI device connected as an endpoint to Intel host machine. The requirement is to run dpdk like user space data path application in VM using PCI PF passthrough (SRIOV disabled). This application works fine on host kernel and uses VFIO to get MSIX interrupts from PCI device. We are trying to run this existing application in VM using PCI passthrough. This application has capability to use VFIO_IOMMU_TYPE1 as wells as VFIO_NOIOMMU.
On Intel host machine VT-d has been enabled and using virt-manager PCI device PF is assigned to the VM. This makes virt-manager to implicitly binds PCI device PF to vfio with vfio_iommu_type1. The VM LINUX kernel was booted with intel_iommu=on as boot parameter. My question: Is it possible that vfio can coexist in host (by virt-manager) as well as VM (by application)? If yes, does application running inside VM needs to configure VFIO with iommu_type=IOMMU or iommu_type=no-iommu. In VM I tried inserting vfio_iommu_type1.ko kernel module which failed with "No such device error". Thats why I am confused whether my requirement is legitimate or not. What could be the best solution? Thanks in advance Nitin
