[vfio-users] UEFI + PCI USB Device

[Brett Foster]

Hi all,

So I've been fumbling my way through setting up a virtual machine with GPU
pass through. I was able to get UEFI + ATI R5 230 to windows 8.1 installer.
Great... now I wanted to add a PCI USB 3.0 card to the VM. When I do, the
VM locks up at the main OVMF screen that says "TianoCore" and so many bytes
of system memory tested.

Unlike the GPU I found I couldn't figure out great way to prevent the
standard linux drivers from picking up the device before being able to map
to vfio-pci. So I unbind the device when booting:

echo 0000:04:00.0 > /sys/bus/pci/drivers/xhci_hcd/unbind

Thoughts?

Kernel: 4.0.4-301.fc22.x86_64
Qemu: qemu-2.3.0-3.fc22

The only seemingly relevant messages in the kernel log are:
[ 6209.596712] vfio-pci 0000:05:00.1: enabling device (0400 -> 0402)
[ 6209.619946] vfio-pci 0000:04:00.0: enabling device (0400 -> 0402)

The card is on its own group:
/sys/kernel/iommu_groups/13/devices/0000:04:00.005:00.0 VGA compatible
controller [0300]:
The GPU is on these groups:
/sys/kernel/iommu_groups/14/devices/0000:05:00.0
/sys/kernel/iommu_groups/14/devices/0000:05:00.1

04:00.0 USB controller [0c03]: Renesas Technology Corp. uPD720201 USB 3.0
Host Controller [1912:0014] (rev 03) (prog-if 30 [XHCI])
    Subsystem: Renesas Technology Corp. uPD720201 USB 3.0 Host Controller
[1912:0014]
    Flags: bus master, fast devsel, latency 0, IRQ 19
    Memory at f7200000 (64-bit, non-prefetchable) [size=8K]
    Capabilities: <access denied>
    Kernel driver in use: vfio-pci
Advanced Micro Devices, Inc. [AMD/ATI] Caicos PRO [Radeon HD 7450]
[1002:677b] (prog-if 00 [VGA controller])
    Subsystem: ASUSTeK Computer Inc. Device [1043:3025]
    Flags: bus master, fast devsel, latency 0, IRQ 16
    Memory at e0000000 (64-bit, prefetchable) [size=256M]
    Memory at f7120000 (64-bit, non-prefetchable) [size=128K]
    I/O ports at c000 [size=256]
    Expansion ROM at f7100000 [disabled] [size=128K]
    Capabilities: <access denied>
    Kernel driver in use: vfio-pci
    Kernel modules: radeon

05:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Caicos
HDMI Audio [Radeon HD 6400 Series] [1002:aa98]
    Subsystem: ASUSTeK Computer Inc. Device [1043:aa98]
    Flags: bus master, fast devsel, latency 0, IRQ 17
    Memory at f7140000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: <access denied>
    Kernel driver in use: vfio-pci
    Kernel modules: snd_hda_intel
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