[SOLVED] GPU Passthrough - HDMI audio

[cromatn5]

Hello

Since i upgraded to Proxmox 6 the HDMI audio of my GPU cannot be passed to a VM.
The GPU is 01:00.0 and audio is 01:00.1

When i start ths VM, only the GPU is passed through.

Spoiler: dmesg

[ 2.917161] vfio-pci 0000:01:00.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=nonewns=none
[ 2.935884] vfio_pci: add [1002:6985[ffffffff:ffffffff]] class 0x000000/00000000
[ 2.955954] vfio_pci: add [1002:aae0[ffffffff:ffffffff]] class 0x000000/00000000
[ 256.053095] vfio-pci 0000:01:00.0: enabling device (0000 -> 0003)
[ 256.053458] vfio_ecap_init: 0000:01:00.0 hiding ecap 0x19@0x270
[ 256.053465] vfio_ecap_init: 0000:01:00.0 hiding ecap 0x1b@0x2d0
[ 256.053471] vfio_ecap_init: 0000:01:00.0 hiding ecap 0x1e@0x370

Spoiler: lspci

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Lexa XT [Radeon PRO WX 3100] [1002:6985]
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Baffin HDMI/DP Audio [Radeon RX 550 640SP / RX 560/560X] [1002:aae0]

Spoiler: VM config

agent: 1,fstrim_cloned_disks=1
bios: ovmf
bootdisk: scsi0
cores: 4
cpu: host
efidisk0: vm-data:vm-101-disk-0,size=4M
hostpci0: 01:00,x-vga=1,pcie=1,romfile=lexa.rom
ide2: none,media=cdrom
machine: q35
memory: 8192
name: GameMachine
net0: virtio=7E:46:C9:A4:83:4E,bridge=vmbr0,firewall=1
numa: 0
ostype: win10
protection: 1
scsi0: vm-os:vm-101-disk-0,discard=on,size=50G,ssd=1
scsi1: vm-data:vm-101-disk-2,discard=on,size=200G,ssd=1
scsihw: virtio-scsi-single
smbios1: uuid=c2fcc5fd-2df8-4b70-982f-c0a4242b0d1e
sockets: 1
tablet: 0
usb0: host=0a12:0001
usb1: host=045e:0719
vga: none
vmgenid: ed604467-ca39-46f2-b43b-5ea6d268494b

 

[wolfgang]

Hi,

You forgot in your config the Audio Device.
There is only the setting for GPU passthrough.

 

[cromatn5]

The Multifunction box is checked.
I tried to passthrougt separatly Audio and GPU but same problem, Audio is just ignored

Spoiler: vm config

agent: 1,fstrim_cloned_disks=1
bios: ovmf
bootdisk: scsi0
cores: 4
cpu: host
efidisk0: vm-data:vm-101-disk-0,size=4M
hostpci0: 01:00.0,x-vga=1,pcie=1
hostpci1: 01:00.1,pcie=1
ide2: none,media=cdrom
machine: q35
memory: 8192
name: GameMachine
net0: virtio=7E:46:C9:A4:83:4E,bridge=vmbr0,firewall=1
numa: 0
ostype: win10
protection: 1
scsi0: vm-os:vm-101-disk-0,discard=on,size=50G,ssd=1
scsi1: vm-data:vm-101-disk-2,discard=on,size=200G,ssd=1
scsihw: virtio-scsi-single
smbios1: uuid=c2fcc5fd-2df8-4b70-982f-c0a4242b0d1e
sockets: 1
tablet: 0
usb0: host=0a12:0001
usb1: host=045e:0719
vga: none
vmgenid: ed604467-ca39-46f2-b43b-5ea6d268494b

 

[dcsapak]

can you post the output of

qm showcmd ID --pretty

of your vm ID ?

also do you have any logs from inside the vm that might reveal a problem?

 

[cromatn5]

There is no log inside the VM.

Spoiler: qm show

/usr/bin/kvm \
-id 101 \
-name GameMachine \
-chardev 'socket,id=qmp,path=/var/run/qemu-server/101.qmp,server,nowait' \
-mon 'chardev=qmp,mode=control' \
-chardev 'socket,id=qmp-event,path=/var/run/qmeventd.sock,reconnect=5' \
-mon 'chardev=qmp-event,mode=control' \
-pidfile /var/run/qemu-server/101.pid \
-daemonize \
-smbios 'type=1,uuid=c2fcc5fd-2df8-4b70-982f-c0a4242b0d1e' \
-drive 'if=pflash,unit=0,format=raw,readonly,file=/usr/share/pve-edk2-firmware//OVMF_CODE.fd' \
-drive 'if=pflash,unit=1,format=raw,id=drive-efidisk0,file=/dev/pve-data/vm-101-disk-0' \
-smp '4,sockets=1,cores=4,maxcpus=4' \
-nodefaults \
-boot 'menu=on,strict=on,reboot-timeout=1000,splash=/usr/share/qemu-server/bootsplash.jpg' \
-vga none \
-nographic \
-no-hpet \
-cpu 'host,+kvm_pv_unhalt,+kvm_pv_eoi,hv_vendor_id=proxmox,hv_spinlocks=0x1fff,hv_vapic,hv_time,hv_reset,hv_vpindex,hv_runtime,hv_relaxed,hv_synic,hv_stimer,hv_tlbflush,hv_ipi,kvm=off' \
-m 8192 \
-device 'vmgenid,guid=ed604467-ca39-46f2-b43b-5ea6d268494b' \
-readconfig /usr/share/qemu-server/pve-q35.cfg \
-device 'vfio-pci,host=01:00.0,id=hostpci0.0,bus=ich9-pcie-port-1,addr=0x0.0,multifunction=on' \
-device 'vfio-pci,host=01:00.1,id=hostpci0.1,bus=ich9-pcie-port-1,addr=0x0.1' \
-device 'usb-host,vendorid=0x0a12,productid=0x0001,id=usb0' \
-device 'usb-host,vendorid=0x045e,productid=0x0719,id=usb1' \
-chardev 'socket,path=/var/run/qemu-server/101.qga,server,nowait,id=qga0' \
-device 'virtio-serial,id=qga0,bus=pci.0,addr=0x8' \
-device 'virtserialport,chardev=qga0,name=org.qemu.guest_agent.0' \
-device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3' \
-iscsi 'initiator-name=iqn.1993-08.org.debian:01:d2ee1df1edae' \
-drive 'if=none,id=drive-ide2,media=cdrom,aio=threads' \
-device 'ide-cd,bus=ide.1,unit=0,drive=drive-ide2,id=ide2,bootindex=200' \
-device 'virtio-scsi-pci,id=virtioscsi0,bus=pci.3,addr=0x1' \
-drive 'file=/dev/pve-root/vm-101-disk-0,if=none,id=drive-scsi0,discard=on,format=raw,cache=none,aio=native,detect-zeroes=unmap' \
-device 'scsi-hd,bus=virtioscsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0,id=scsi0,rotation_rate=1,bootindex=100' \
-device 'virtio-scsi-pci,id=virtioscsi1,bus=pci.3,addr=0x2' \
-drive 'file=/dev/pve-data/vm-101-disk-2,if=none,id=drive-scsi1,discard=on,format=raw,cache=none,aio=native,detect-zeroes=unmap' \
-device 'scsi-hd,bus=virtioscsi1.0,channel=0,scsi-id=0,lun=1,drive=drive-scsi1,id=scsi1,rotation_rate=1' \
-netdev 'type=tap,id=net0,ifname=tap101i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' \
-device 'virtio-net-pci,mac=7E:46:C9:A4:83:4E,netdev=net0,bus=pci.0,addr=0x12,id=net0,bootindex=300' \
-rtc 'driftfix=slew,base=localtime' \
-machine 'type=q35' \
-global 'kvm-pit.lost_tick_policy=discard'

 

[cromatn5]

OK I found the problem: it's q35.
With 440fx Audio works

 

[dcsapak]

i could reproduce it also , upstream bug for reference: https://bugs.launchpad.net/qemu/+bug/1826422

the recommended way to fix this is to set the machine type to an older version e.g.

qm set ID -machine pc-q35-3.1

this should be fixed with 4.0.1 or 4.1 upstream

 

[cromatn5]

Perfect, now it's working.

Thanks you very much.

 

[pjgowtham]

i could reproduce it also , upstream bug for reference: https://bugs.launchpad.net/qemu/+bug/1826422

the recommended way to fix this is to set the machine type to an older version e.g.

qm set ID -machine pc-q35-3.1

this should be fixed with 4.0.1 or 4.1 upstream

Worked like a charm.