On 15/01/2018 21:32, Tsu-Hsiang K Cheng wrote: > > We were trying to set up the PCI device passthrough, especially the > network interface card, to the KVM guest with the VT-d posted > interrupt. We are wondering if VFIO supports the VT-d posted > interrupt. If it does, how can we enable the VT-d posted interrupt for > the KVM guest. If it does not, is there any alternative approach to > set up the PCI device passthrough with the posted interrupt? Thank > you. It's set up automatically if your kernel is new enough (and of course your hardware supports it). Check /proc/interrupts while a guest is running, if the "PIW" line is nonzero you have it. What kernel are you using? Thanks, Paolo
