I have Ubuntu 20.04 hosted on HP elite book G8 (i7 1185G7) and Windows 10 guest through kvm.
I need to connect a Thunderbolt audio device (Presonus Quantum) to windows. I did it using a virtual machine manager (found an audio device using lspci and added it to the machine in VM manager). I installed the official device driver in windows and the device is recognized and working.
However, the audio device causes regular freezing of windows 10 guest (linux is still working). Freezes can be a few seconds to few minutes, sound output is buzzing and windows is unresponsive. Then it suddenly unfreezes, works for a few seconds and then again freezes. Currently only key for me is one error message from audio device driver (it's windows desktop application), that appears after unfreezing: "The audio engine has been stopped, because the system became unresponsive due to an overload in the audio engine".
Some additional info:
$ lspci
...
00:1f.5 Serial bus controller [0c80]: Intel Corporation Device a0a4 (rev 20)
2b:00.0 PCI bridge: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] (rev 01)
2c:00.0 PCI bridge: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] (rev 01)
2c:01.0 PCI bridge: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] (rev 01)
2d:00.0 Multimedia audio controller: Device 1c67:0104 <=== this is Presonus Audio Device
...
$ boltctl
● PreSonus Audio Electronics Quantum 2626
├─ type: peripheral
├─ name: Quantum 2626
├─ vendor: PreSonus Audio Electronics
├─ uuid: 00565981-157d-3c00-ffff-ffffffffffff
├─ status: authorized
│ ├─ domain: d065ce53-4e96-8780-ffff-ffffffffffff
│ └─ authflags: none
├─ authorized: Št 18. november 2021, 09:05:59
├─ connected: Št 18. november 2021, 09:05:59
└─ stored: St 17. november 2021, 17:12:54
├─ policy: iommu
└─ key: no
Cmd line used by VM manager to start windows:
- this cmd line was generated by virt-manager gui, I found it through
ps
- I inserted newlines for better readability, presonus audio device is at the end
/usr/bin/qemu-system-x86_64 -name guest=win10,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-6-win10/master-key.aes
-machine pc-q35-4.2,accel=kvm,usb=off,vmport=off,dump-guest-core=off
-cpu Icelake-Server,ss=on,vmx=on,pdcm=on,hypervisor=on,tsc-adjust=on,avx512ifma=on,sha-ni=on,rdpid=on,movdiri=on,movdir64b=on,fsrm=on,md-clear=on,stibp=on,arch-capabilities=on,xsaves=on,ibpb=on,ibrs=on,amd-stibp=on,amd-ssbd=on,rdctl-no=on,ibrs-all=on,skip-l1dfl-vmentry=on,mds-no=on,pschange-mc-no=on,hle=off,rtm=off,mpx=off,intel-pt=off,la57=off,wbnoinvd=off,hv-time,hv-relaxed,hv-vapic,hv-spinlocks=0x1fff
-m 8192 -overcommit mem-lock=off -smp 4,sockets=4,cores=1,threads=1 -uuid 4be79611-2312-4054-a7e9-3ca041d564af -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=31,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -global ICH9-LPC.disable_s3=1 -global ICH9-LPC.disable_s4=1 -boot menu=on,strict=on
-device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2
-device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1
-device pcie-root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2
-device pcie-root-port,port=0x13,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3
-device pcie-root-port,port=0x14,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x4
-device pcie-root-port,port=0x15,chassis=6,id=pci.6,bus=pcie.0,addr=0x2.0x5
-device pcie-root-port,port=0x16,chassis=7,id=pci.7,bus=pcie.0,addr=0x2.0x6
-device pcie-pci-bridge,id=pci.8,bus=pci.1,addr=0x0 -device qemu-xhci,p2=15,p3=15,id=usb,bus=pci.2,addr=0x0
-device virtio-serial-pci,id=virtio-serial0,bus=pci.3,addr=0x0
-blockdev '{"driver":"file","filename":"/var/lib/libvirt/images/pool/win10.qcow2","node-name":"libvirt-1-storage","cache":{"direct":true,"no-flush":false},"auto-read-only":true,"discard":"unmap"}'
-blockdev '{"node-name":"libvirt-1-format","read-only":false,"cache":{"direct":true,"no-flush":false},"driver":"qcow2","file":"libvirt-1-storage","backing":null}'
-device virtio-blk-pci,scsi=off,bus=pci.4,addr=0x0,drive=libvirt-1-format,id=virtio-disk0,bootindex=1,write-cache=on -netdev tap,fd=33,id=hostnet0,vhost=on,vhostfd=34
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:b8:50:7e,bus=pci.6,addr=0x0
-chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0
-chardev spicevmc,id=charchannel0,name=vdagent
-device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0
-device usb-tablet,id=input0,bus=usb.0,port=1 -spice port=5900,addr=127.0.0.1,disable-ticketing,image-compression=off,seamless-migration=on -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pcie.0,addr=0x1
-device ich9-intel-hda,id=sound0,bus=pcie.0,addr=0x1b
-device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0
-chardev spicevmc,id=charredir0,name=usbredir -device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=2
-chardev spicevmc,id=charredir1,name=usbredir
-device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=3
# this is presonus audio device (0000:2d:00.0):
-device vfio-pci,host=0000:2d:00.0,id=hostdev0,bus=pci.8,addr=0x1
-device virtio-balloon-pci,id=balloon0,bus=pci.5,addr=0x0
-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg timestamp=on
As I am not experienced in this field, and I did not find any topics covering similar issues, I would like to ask you for help. I don't even know, how to start to debug this issue. Do you have any suggestions?
Thank you very much!
