Hello, I'm facing an issue since days regarding SR-IOV. On a specific configuration, I'm unable to start VM with a VF. Tyan S5510 + Intel E3 1220 (vt-x and vt-d enabled). I've enable 63 VF (intel X520-DA2). Engine interface show me : Enabled virtual function: 63 Free Virtual function: 63 I've create a Network + vNIC profile (Passthrough enabled) I have the same issue if I force mapping "Allowed Networks / All networks / Specific networks" or not (on host setup network) When I try to start VM Engine error message is: Failed to run VM test due to a failed validation: [Cannot run VM. There is no host that satisfies current scheduling constraints. See below for details:, The host sriov-hp1.admin-lan.nfrance.com did not satisfy internal filter Network because there are no free virtual functions which are suitable for virtual nic(s) nic1. A virtual function is considered as suitable if the VF's configuration of its physical function contains the virtual nic's network/network label.] (User: admin@internal-authz). Problem seem not be related to host. VF are visible into ip l on my host. Unfortunately, I have no representative error log on side host or engine log (expect error above on engine log) For information, kernel parameters on host are: intel_iommu=on pci=assign-busses. pci=assign-busses is mandatory on this motherboard otherwise VF cannot be created. Do you have idea ?