PCI passthrough onboard sound

LS,

I am trying to passthrough onboard audio
lspci -v
34:00.4 Audio device: Advanced Micro Devices, Inc. [AMD] Starship/Matisse HD Audio Controller
Subsystem: ASRock Incorporation Starship/Matisse HD Audio Controller
Flags: fast devsel, IRQ 11
Memory at df500000 (32-bit, non-prefetchable) [disabled] [size=32K]
Capabilities: [48] Vendor Specific Information: Len=08 <?>
Capabilities: [50] Power Management version 3
Capabilities: [64] Express Endpoint, MSI 00...

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