I need to passtrough a USB 3.0 controller for a VM under qemu.
My lspci -nnk is :
...
02:00.0 USB controller [0c03]: Renesas Technology Corp. uPD720201 USB 3.0 Host Controller [1912:0014] (rev 03)
Kernel driver in use: xhci_hcd
03:00.0 USB controller [0c03]: VIA Technologies, Inc. VL805 USB 3.0 Host Controller [1106:3483] (rev 01)
Subsystem: Gigabyte Technology Co., Ltd VL805 USB 3.0 Host Controller [1458:5007]
Kernel driver in use: xhci_hcd
...
The one I want to passtrough is the uPD720201, it is lonely in its IOMMU group.
My vfio.conf is :
options vfio-pci ids=1002:68f9,1002:aa68,1912:0014 disable_vga=1
#Note : the 1002:68f9 and 1002:aa68 are the gpu card, which is correctly pass trough
But now the problem seems to be the xhci_hcd driver overrides the vfio driver, because it seems to be correctly loaded at boot :
$ dmesg | grep "vfio"
[ 4.475492] vfio: unknown parameter 'vfio_iommu_type1' ignored
[ 4.476319] vfio: unknown parameter 'vfio_virqfd' ignored
[ 4.477177] vfio: unknown parameter 'vfio_pci' ignored
[ 4.478023] vfio: unknown parameter 'ids' ignored
[ 21.546903] vfio-pci 0000:05:00.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=none:owns=none
[ 21.568068] vfio_pci: add [1002:68f9[ffff:ffff]] class 0x000000/00000000
[ 21.588151] vfio_pci: add [1002:aa68[ffff:ffff]] class 0x000000/00000000
[ 21.588824] vfio_pci: add [1912:0014[ffff:ffff]] class 0x000000/00000000
[ 27.296307] vfio-pci 0000:05:00.0: vgaarb: changed VGA decodes: olddecodes=none,decodes=none:owns=none
I already try to blacklist xhci_hcd in blacklist.conf and grub :
/etc/modprobe.d/blacklist.conf
...
blacklist xhci_hcd
...
/etc/default/grub
...
GRUB_CMDLINE_LINUX_DEFAULT="amd_iommu=on iommu=pt kvm_amd.npt=1 modprobe.blacklist=xhci_hcd"
...
I have of course do a update-initramfs -u and a update-grub2 after those modifications. In all cases it has no effect, I always have "Kernel driver in use: xhci_hcd" The only way I found to disable xhci_hcd is to unbind my card by :
$ echo '0000:02:00.0' | tee /sys/bus/pci/devices/0000:02:00.0/driver/unbind
but I don't know how to execute it at boot (probably before vfio assignment).
Do you know a solution to disable xhci_hcd (or another method) to get it work?
I tried, I have this:
The command already appears but all on one line, so I just put carriage returns between them.
Now my onboard USB3 controller is disabled ( I've tried to put a USB device on it and it is realy disabled ) but not my added one.
My lspci -nnk is :
...
02:00.0 USB controller [0c03]: Renesas Technology Corp. uPD720201 USB 3.0 Host Controller [1912:0014] (rev 03)
Kernel driver in use: xhci_hcd
03:00.0 USB controller [0c03]: VIA Technologies, Inc. VL805 USB 3.0 Host Controller [1106:3483] (rev 01)
Subsystem: Gigabyte Technology Co., Ltd VL805 USB 3.0 Host Controller [1458:5007]
...
Note : now my grub file is (and it make what I describe above persistant) :
/etc/default/grub
...
GRUB_CMDLINE_LINUX="amd_iommu=on iommu=pt kvm_amd.npt=1"
GRUB_CMDLINE_LINUX="modprobe.blacklist=xhci_hcd"
...
I finally do the choice to totally rebuild the kernel from kernel.org sources and make xhci_hcd as a loaded module and not built-in module. Now I can disable xhci_hcd by a :
followed by a :
Now I can attach the controller to the VM and I obtain :
But unfortunately my onboard USB 3.0 controller (VL805) is disabled, so I just do a :
So now both controllers works on the good machines, but it was a bit complicated
Note : all configurations in grub and blacklist.conf are useless.
Can you bring up the GRUB boot menu and edit the command line options similar to what the @matsuzaki did in this post?
If so, then you may be able to add the blacklist,
modprobe.blacklist=xhci_hcd, in as a parameter.According to this post you may want to try
F1to bring up the boot menu: askubuntu.com/questions/1014626/how-to-access-grub-menu