Problem with audio passthrough in virtual mac

Software & Operating Systems Mac
1

Hi

Im trying to get audio working in my virtual mac. Everything except audio is currently working.

The audio device sits in its own iommu grup and can be seen here

tonny@tonny-System-Product-Name** : **/home/osx/OSX-KVM** $ ./ls-iommu.sh | grep "Group 24"
IOMMU **Group 24** 09:00.4 Audio device [0403]: Advanced Micro Devices, Inc. [AMD] Starship/Matisse HD Audio Controller [1022:1487]

i pass it via boot grub config like this (together with disply adaptor)

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amd_iommu=on iommu=pt vfio-pci.ids=1002:731f,1002:ab38,1022:1487 video=efifb:off"

i also load the applealc kernel module in config.plist like this

		<dict>
			<key>Arch</key>
			<string>x86_64</string>
			<key>BundlePath</key>
			<string>AppleALC.kext</string>
			<key>Comment</key>
			<string>Audio patches</string>
			<key>Enabled</key>
			<true/>
			<key>ExecutablePath</key>
			<string>Contents/MacOS/AppleALC</string>
			<key>MaxKernel</key>
			<string></string>
			<key>MinKernel</key>
			<string>12.0.0</string>
			<key>PlistPath</key>
			<string>Contents/Info.plist</string>
		</dict>

but osx still shows no audio devices.

i have no sound in ubuntu when i boot up, so i gues the passthrough is working, osx simply does not se the audio device.

any help is much apriciated. Thank you very much for this excelent forum btw.

  • Tonny
2

i just checked to se the applealc is actually loaded, and it seems so

tonny@tonnys-iMac-Pro ~ % kextstat | grep -i alc
Executing: /usr/bin/kmutil showloaded
No variant specified, falling back to release
   50    0 0                  0x169000   0x169000   as.vit9696.AppleALC (1.5.4) 8C9B5F07-7F19-3BED-B331-B4827F402569 <48 14 8 6 5 3 2 1>
3

Digging in the log (found the commands via applealc homepage) i get this

Filtering the log data using "process == "kernel" AND (composedMessage CONTAINS "AppleALC" OR composedMessage CONTAINS "Lilu")"
Skipping info and debug messages, pass --info and/or --debug to include.
Timestamp                       (process)[PID]    
2020-12-30 06:16:04.541523-0800  localhost kernel[0]: calling mpo_policy_init for Lilu
2020-12-30 06:16:04.554159-0800  localhost kernel[0]: Security policy loaded: Lilu Kernel Extension 1.4.9 (Lilu)
2020-12-30 06:16:08.654054-0800  localhost kernel[0]: (Lilu) AppleALC       alc: @ error: no layout-id property found in configuration
2020-12-30 06:16:45.452232-0800  localhost kernel[0]: (Lilu) AppleALC       alc: @ failed to obtain device info for analog controller (1)
2020-12-30 06:34:52.599146-0800  localhost kernel[0]: calling mpo_policy_init for Lilu
2020-12-30 06:34:52.611741-0800  localhost kernel[0]: Security policy loaded: Lilu Kernel Extension 1.4.9 (Lilu)
2020-12-30 06:34:56.111126-0800  localhost kernel[0]: (Lilu) AppleALC       alc: @ error: no layout-id property found in configuration
2020-12-30 06:35:02.454734-0800  localhost kernel[0]: (Lilu) AppleALC       alc: @ failed to obtain device info for analog controller (1)
2020-12-30 15:06:52.907818+0000  localhost kernel[0]: (Lilu) AppleALC       alc: @ error: no layout-id property found in configuration
2020-12-30 15:06:52.907918+0000  localhost kernel[0]: (Lilu) Lilu      user: @ disabling user patcher on request!
2020-12-30 15:07:04.459803+0000  localhost kernel[0]: (Lilu) AppleALC       alc: @ failed to obtain device info for analog controller (1)
2020-12-30 07:08:52.979305-0800  localhost kernel[0]: (Lilu) AppleALC       alc: @ error: no layout-id property found in configuration
2020-12-30 07:08:52.979894-0800  localhost kernel[0]: (Lilu) Lilu      user: @ disabling user patcher on request!
2020-12-30 07:09:05.459027-0800  localhost kernel[0]: (Lilu) AppleALC       alc: @ failed to obtain device info for analog controller (1)
2021-01-01 07:16:01.887586-0800  localhost kernel[0]: (Lilu) AppleALC       alc: @ error: no layout-id property found in configuration
2021-01-01 07:16:01.887714-0800  localhost kernel[0]: (Lilu) Lilu      user: @ disabling user patcher on request!
2021-01-01 07:16:12.105642-0800  localhost kernel[0]: (Lilu) AppleALC       alc: @ failed to obtain device info for analog controller (1)
2021-01-01 07:29:24.749125-0800  localhost kernel[0]: (Lilu) Lilu      user: @ disabling user patcher on request!
2021-01-01 07:31:18.822476-0800  localhost kernel[0]: (Lilu) Lilu      user: @ disabling user patcher on request!
2021-01-01 07:33:58.572545-0800  localhost kernel[0]: (Lilu) Lilu      user: @ disabling user patcher on request!
2021-01-04 17:27:43.021806+0100  localhost kernel[0]: (Lilu) AppleALC       alc: @ error: no layout-id property found in configuration
2021-01-04 17:27:43.022600+0100  localhost kernel[0]: (Lilu) Lilu      user: @ disabling user patcher on request!

so i gues i need some kind of layout id, any suggestions on how to get that setup correctly ?

4

i tried mounting the efi folder and adding alcid=11 to boot arguments. Now the virtual machine cannot start. I will have to figure out how to mount the efi partition from within ubuntu somehow

5

ok so i managed to reset the EFI via redownloading the osx-kvm repos and just reploace my xml configs and disks and base system and osx can now boot again.

I cannot figureout if it was the alcid=11 that prevneted the boot.