Hi All

 

Strange issue with passthrough of my 1660S.

 

Due to USB breakout requirements, I've forced MMU groups to split out.

 

pcie_acs_override=downstream,multifunction vfio_iommu_type1.allow_unsafe_interrupts=1

 

I now have the GPU, Audio and 'USB Controller' all in their own MMU group with no sharing.

 

IOMMU group 32:[10de:21c4] 0a:00.0 VGA compatible controller: NVIDIA Corporation TU116 [GeForce GTX 1660 SUPER] (rev a1)

IOMMU group 33:[10de:1aeb] 0a:00.1 Audio device: NVIDIA Corporation TU116 High Definition Audio Controller (rev a1)

IOMMU group 34:[10de:1aec] 0a:00.2 USB controller: NVIDIA Corporation TU116 USB 3.1 Host Controller (rev a1)

 

On the Windows 10 VM Config, I assign the GPU and sound card as expected but receive the following error:

 

internal error: qemu unexpectedly closed the monitor: 2021-04-18T08:32:22.076398Z qemu-system-x86_64: -device vfio-pci,host=0000:0a:00.1,id=hostdev1,bus=pci.9,addr=0x0: vfio 0000:0a:00.1: failed to setup container for group 33: Failed to set iommu for container: Operation not permitted

 

Seeing that the audio controller is in a separate, isolated MMU group, I'm struggling to understand why I'm facing this issue.  Any ideas?

 

HP MP350P Gen 8 with latest bios.

 

Thanks

 

Mo 

 

tower-diagnostics-20210418-0934.zip

Did you resolve this, @M0CRT? I'm dealing with a similar issue.