I passthrough my GPU and GPU sound too a Windows 10 VM, this is working.

But I also need to passthrough the internal audio for a microphone, this isn't working.

If I try to start my VM with the internal audio I get this error

internal error: qemu unexpectedly closed the monitor: 2020-04-17T18:23:15.735041Z qemu-system-x86_64: -device vfio-pci,host=0000:00:1f.3,id=hostdev2,bus=pci.8,addr=0x1: vfio 0000:00:1f.3: group 13 is not viable Please ensure all devices within the iommu_group are bound to their vfio bus driver.

My IOMMU groups look like this

IOMMU group 0:	[8086:3ec2] 00:00.0 Host bridge: Intel Corporation 8th Gen Core Processor Host Bridge/DRAM Registers (rev 07)
IOMMU group 1:	[8086:1901] 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x16) (rev 07)
IOMMU group 2:	[8086:1905] 00:01.1 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x8) (rev 07)
IOMMU group 3:	[8086:3e92] 00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 630 (Desktop)
IOMMU group 4:	[8086:1911] 00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model
IOMMU group 5:	[8086:a2af] 00:14.0 USB controller: Intel Corporation 200 Series/Z370 Chipset Family USB 3.0 xHCI Controller
	[8086:a2b1] 00:14.2 Signal processing controller: Intel Corporation 200 Series PCH Thermal Subsystem
IOMMU group 6:	[8086:a2ba] 00:16.0 Communication controller: Intel Corporation 200 Series PCH CSME HECI #1
IOMMU group 7:	[8086:a282] 00:17.0 SATA controller: Intel Corporation 200 Series PCH SATA controller [AHCI mode]
IOMMU group 8:	[8086:a2e7] 00:1b.0 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #17 (rev f0)
IOMMU group 9:	[8086:a2eb] 00:1b.4 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #21 (rev f0)
IOMMU group 10:	[8086:a290] 00:1c.0 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #1 (rev f0)
IOMMU group 11:	[8086:a294] 00:1c.4 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #5 (rev f0)
IOMMU group 12:	[8086:a298] 00:1d.0 PCI bridge: Intel Corporation 200 Series PCH PCI Express Root Port #9 (rev f0)
IOMMU group 13:	[8086:a2c9] 00:1f.0 ISA bridge: Intel Corporation Z370 Chipset LPC/eSPI Controller
	[8086:a2a1] 00:1f.2 Memory controller: Intel Corporation 200 Series/Z370 Chipset Family Power Management Controller
	[8086:a2f0] 00:1f.3 Audio device: Intel Corporation 200 Series PCH HD Audio
	[8086:a2a3] 00:1f.4 SMBus: Intel Corporation 200 Series/Z370 Chipset Family SMBus Controller
IOMMU group 14:	[8086:15b8] 00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (2) I219-V
IOMMU group 15:	[10de:1b80] 01:00.0 VGA compatible controller: NVIDIA Corporation GP104 [GeForce GTX 1080] (rev a1)
	[10de:10f0] 01:00.1 Audio device: NVIDIA Corporation GP104 High Definition Audio Controller (rev a1)
IOMMU group 16:	[10de:1284] 02:00.0 VGA compatible controller: NVIDIA Corporation GK208 [GeForce GT 630 Rev. 2] (rev a1)
	[10de:0e0f] 02:00.1 Audio device: NVIDIA Corporation GK208 HDMI/DP Audio Controller (rev a1)
IOMMU group 17:	[c0a9:2263] 03:00.0 Non-Volatile memory controller: Micron/Crucial Technology P1 NVMe PCIe SSD (rev 03)
IOMMU group 18:	[8086:24fd] 04:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
IOMMU group 19:	[1b21:2142] 06:00.0 USB controller: ASMedia Technology Inc. ASM2142 USB 3.1 Host Controller
IOMMU group 20:	[144d:a804] 07:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961

This is with PCIe ACS override: Downstream, but it doesn't matter which isolation I use.

I cannot isolate the audio device. Can I do anything else?

I also uploaded my diagnostics file.

Thanks

 

nas-diagnostics-20200417-1830.zip

It looks like your audio device 00:1f.3 is part of several items on the same IOMMU group (13).  As far as I know, you can't pass it through unless it's in it's own group.

Yes I also read that, but can I somehow get it in its own group?

I'm also interested in this, has anyone found an answer?