[vfio-users] Code 43 when using Quadro K420 on another system.

[Eddie Yen]

Hi there,

I'm trying to do passthrough on another machine, since I can do the same
thing on the original, I think it would be easy, but I was wrong.

Here's the info about this server.

CPU: Intel Xeon E5 2620 v2 x 2
OS: Ubuntu 16.04 Server (Kernel ver: 4.4.0)
QEMU verison: 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.14)
Libvirt version: 1.3.1

Only the different things is this server included BMC VGA, and I install
Xfce virtual GUI + VNC.

Below is what I'm setting on Ubuntu:

1. Blacklist the nouveau or other drivers about Nvidia
Included nouveau, vga16fb, rivafb, nvidiafb, rivatv.

2. Add VFIO drivers into init list when boot .
# cat /etc/modules
vfio
vfio_pci
vfio_iommu_type1
vfio_virqfd

3. Add K420 PID & VID and open IOMMU function into GRUB
GRUB_CMDLINE_LINUX_DEFAULT="intel_iommu=on vfio-pci.ids=10de:0ff3,10de:0e1b"

4. Build VM and install Windows Server 2012 R2

5. Shutdown VM, add kvm=off, delete everything about Hyper-V function, and
passthrough K420 after installation.


But when I mount K420 into VM, VFIO shows error on kernel log.
vfio-pci 0000:06:00.0: BAR 3: can't reserve [mem 0xd0000000-0xd1ffffff
64bit pref]

And I checked /proc/iomem, it shows

80000000-dfffffff : PCI Bus 0000:00
  80000000-8fffffff : PCI MMCONFIG 0000 [bus 00-ff]
    80000000-8fffffff : reserved
  c0000000-d1ffffff : PCI Bus 0000:06
    c0000000-cfffffff : 0000:06:00.0
    d0000000-d1ffffff : 0000:06:00.0
      d1000000-d112ffff : vesafb


VM can boot, but show Code 43 after installed driver.

I don't know why it occupied by vesafb, since this server already have BMC
chip.


Here's the VM profile:

https://pastebin.com/PXuT4Vqg


Any ideas?



Many thanks,
Eddie.
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