[vfio-users] libvirt.libvirtError: unsupported configuration: host doesn't support passthrough of host PCI devices

[Konrad Wojtoń]

Did you update your grub.cfg atfer modyfing GRUB_CMDLINE_LINUX to have
intel_iommu=on and such? It is not present in your dump of /proc/cmdline
so it looks like it is not passed to kernel at boot time.



W dniu 08.11.2019 o 13:30, Patrick O'Callaghan pisze:
> I'm getting the above error after a fresh install of Fedora 31 on the
> same hardware Fedora 30 previously worked on. I've restored my libvirt
> and qemu installations from backups, and everything works except for
> VFIO passthrough. The only difference is that now I'm booting the host
> via EFI instead of BIOS (the Windows guest has always been UEFI) but I
> don't see why that should matter.
> 
> These are the relevant templates:
> 
>    $ cat vfio-grub
>    GRUB_TIMEOUT=5
>    GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
>    GRUB_DEFAULT=saved
>    GRUB_DISABLE_SUBMENU=true
>    GRUB_TERMINAL_OUTPUT="console"
>    GRUB_CMDLINE_LINUX="modprobe.blacklist=nvidia modprobe.blacklist=nouveau rd.blacklist=nvidia rd.blacklist=nouveau intel_iommu=on,igfx_off iommu=pt rd.driver.pre=vfio-pci vconsole.font=latarcyrheb-sun16 $([ -x /usr/sbin/rhcrashkernel-param ] && /usr/sbin/rhcrashkernel-param || :) rhgb quiet resume=UUID=15d273c5-488c-48d6-a864-e11968ee970e audit=0 hugepages=4096"
>    GRUB_DISABLE_RECOVERY="true"
> 
>    $ cat vfio.conf
>    options vfio-pci ids=10de:1c81,10de:0fb9
> 
>    $ cat local.conf
>    force_drivers+="vfio vfio_iommu_type1 vfio_pci vfio_virqfd"
> 
> I've done the following (same as always):
> 
>    $ sudo cp vfio.conf /etc/modprobe.d/vfio.conf
>    $ sudo cp local.conf /etc/dracut.conf.d/local.conf
>    $ sudo cp vfio-grub /etc/sysconfig/grub
>    $ sudo grub2-mkconfig -o /etc/grub2.cfg
>    $ sudo dracut -f --kver `uname -r`
> 
> The kernel vfio modules are loaded:
> 
>    $ lsmod|grep vfio
>    vfio_pci               61440  0
>    irqbypass              16384  2 vfio_pci,kvm
>    vfio_virqfd            16384  1 vfio_pci
>    vfio_iommu_type1       32768  0
>    vfio                   36864  2 vfio_iommu_type1,vfio_pci
> 
> For completeness, the kernel boot line reads:
> 
>    $ cat /proc/cmdline         
>    BOOT_IMAGE=(hd1,gpt2)/vmlinuz-5.3.8-300.fc31.x86_64 root=/dev/mapper/fedora_localhost--live-root ro resume=/dev/mapper/fedora_localhost--live-swap rd.lvm.lv=fedora_localhost-live/root rd.lvm.lv=fedora_localhost
>    -live/swap modprobe.blacklist=nvidia modprobe.blacklist=nouveau rd.blacklist=nvidia rd.blacklist=nouveau rhgb quiet
> 
> 
> I must be missing something but can't think what it is. Any ideas would
> be welcome.
> 
> poc
> 
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