[vfio-users] VFIO PCI passthrough problems booting VM

[Phill Edwards]

>
> That limitation has it's reasons and exists in systems like virtualbox or
> hyper-v.
> But afaik, if you have two devices in one group, and they both are bound
> to vfio-pci, you can attach them to different VMs.
>
OK, so this is what I've done. The devices PCI devices having that are in
the same IOMMU group and need to be assigned to different VMs are:

05:00.0 Ethernet controller [0200]: Intel Corporation 82546EB Gigabit
Ethernet Controller (Copper) [8086:1010] (rev 01)
        Subsystem: Compaq Computer Corporation NC7170 Gigabit Server
Adapter [0e11:00db]
        Kernel driver in use: e1000
05:00.1 Ethernet controller [0200]: Intel Corporation 82546EB Gigabit
Ethernet Controller (Copper) [8086:1010] (rev 01)
        Subsystem: Compaq Computer Corporation NC7170 Gigabit Server
Adapter [0e11:00db]
        Kernel driver in use: e1000
05:02.0 Multimedia video controller [0400]: Conexant Systems, Inc.
CX23880/1/2/3 PCI Video and Audio Decoder [14f1:8800] (rev 05)
        Subsystem: KWorld Computer Co. Ltd. KWorld/VStream XPert DVB-T
[17de:08a6]
05:02.2 Multimedia controller [0480]: Conexant Systems, Inc. CX23880/1/2/3
PCI Video and Audio Decoder [MPEG Port] [14f1:8802] (rev 05)
        Subsystem: KWorld Computer Co. Ltd. KWorld/VStream XPert DVB-T
[17de:08a6]

This PCI device also comes up in group 11 so Ive also bound this to
vfio-pci:
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 PCI Bridge [8086:244e]
(rev a4)


>From what I understand the way to bind them to vfio-pci is on
GRUB_CMDLINE_LINUX
in /etc/sysconfig/grub:
GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet
iommu=pt intel_iommu=on vfio_iommu_type1.allow_unsafe_interrupts=1
vfio-pci=8086:1010,14f1:8800,14f1:8802,8086:244e"

lsmod shows that the vfio-pci kernel module isn't loaded after booting so I
have to run modprobe vfio-pci on the command line to load it. is this a
problem?

I guess I must be doing something wrong as I'm still getting this error:

Unable to complete install: 'internal error: process exited while
connecting to monitor: 2015-09-18T10:13:29.896796Z qemu-kvm: -device
vfio-pci,host=05:02.0,id=hostdev0,bus=pci.0,addr=0x8: vfio: error, group 11
is not viable, please ensure all devices within the iommu_group are bound
to their vfio bus driver.
2015-09-18T10:13:29.896823Z qemu-kvm: -device
vfio-pci,host=05:02.0,id=hostdev0,bus=pci.0,addr=0x8: vfio: failed to get
group 11
2015-09-18T10:13:29.896835Z qemu-kvm: -device
vfio-pci,host=05:02.0,id=hostdev0,bus=pci.0,addr=0x8: Device initialization
failed.
2015-09-18T10:13:29.896847Z qemu-kvm: -device
vfio-pci,host=05:02.0,id=hostdev0,bus=pci.0,addr=0x8: Device 'vfio-pci'
could not be initialized


Aaaarrrrggggghhhh!!!! Why is this so damn difficult...
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