I am attempting to attach PCIe devices in passthrough to my KVM domain. I have two devices in one IOMMU group (#28):
03:00.0 PCI bridge: Texas Instruments XIO2001 PCI Express-to-PCI Bridge 04:00.0 Multimedia audio controller: Texas Instruments TMS320C6414 TMS320C6415 TMS320C6416 and lspci -n values: 03:00.0 0604: 104c:8240 04:00.0 0401: 104c:a106 Both of which are attached to my KVM domain with managed configuration. I am running Ubuntu 14.04. I have: - Installed KVM, set up domains, ensured KVM and vfio-pci modules are loaded - Set intel_iommu=on on the kernel command line and verified it is enabled with dmesg - kvm-ok prints acceleration is all set, VT-d is supported on the chipset - Verified that the 03:00.0 device does not have a driver currently listed under ls -l /sys/bus/pci/devices/0000\:03\:00.0/ though it does have a firmware listed. When attempting to start the VM I get: virsh # start rivendell error: Failed to start domain rivendell error: Failed to bind PCI device '0000:03:00.0' to vfio-pci: No such device and under syslog I get what I believe to be the PCIe EINVAL code: Feb 23 19:46:46 tupac kernel: [ 214.159625] vfio-pci: probe of 0000:03:00.0 failed with error -22 Trying to do this manually: I do this to bind the devices to vfio-pci: # echo "104c a106" > /sys/bus/pci/drivers/vfio-pci/new_id # echo "104c 8240" > /sys/bus/pci/drivers/vfio-pci/new_id Then: root@tupac:~# echo "0000:03:00.0" > /sys/bus/pci/drivers/vfio-pci/bind bash: echo: write error: No such device However, the multimedia controller appears AOK: root@tupac:~# ls -l /sys/bus/pci/drivers/vfio-pci/ total 0 lrwxrwxrwx 1 root root 0 Feb 24 13:07 0000:04:00.0 -> ../../../../devices/pci0000:00/0000:00:02.2/0000:03:00.0/0000:04:00.0 --w------- 1 root root 4096 Feb 24 13:05 bind lrwxrwxrwx 1 root root 0 Feb 24 13:07 module -> ../../../../module/vfio_pci --w------- 1 root root 4096 Feb 24 13:15 new_id --w------- 1 root root 4096 Feb 23 19:47 remove_id --w------- 1 root root 4096 Feb 23 19:43 uevent --w------- 1 root root 4096 Feb 24 13:07 unbind 03:00.0 (which is a PCIe to PCI adapter) is not showing up under vfio-pci's devices. They're in the same IOMMU group so I don't think I can attach them individually. What is causing this? Is this some issue with the presence of the regular old PCI bus in the system behind the adapter? --Nick
