Hi - I am trying to passthrough an amd wx4100 graphics card to my Mac VM, but it always gets stuck on a black screen with one thread max to 100%. The VM works fine with VNC, but when I passthrough a graphics card I get a black screen. I have tried it creating a new Mac VM with my vbios ROM, but it still wouldn't work. I tried the graphics card with a Windows VM and it works fine. I am not really sure whats going wrong as everything worked fine a couple of weeks ago. Have any of you had similar issues when trying to passthrough gpus? Am I not passing through the gpu correctly? Is it because of the gpu's bus? I would really appreciate it if you have any suggestions on how to proceed.
Thanks
EDIT:
I got it to work by changing the GPU and audio bus to bus='0x00'. I read somewhere that macOS doesn't like it when you use other buses.
XML:
<?xml version='1.0' encoding='UTF-8'?>
<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
<name>Macinabox Mojave</name>
<uuid></uuid>
<description>MacOS Mojave</description>
<metadata>
<vmtemplate xmlns="unraid" name="Windows 10" icon="Mojave.png" os="osx"/>
</metadata>
<memory unit='KiB'>16777216</memory>
<currentMemory unit='KiB'>16777216</currentMemory>
<memoryBacking>
<nosharepages/>
</memoryBacking>
<vcpu placement='static'>8</vcpu>
<cputune>
<vcpupin vcpu='0' cpuset='2'/>
<vcpupin vcpu='1' cpuset='12'/>
<vcpupin vcpu='2' cpuset='4'/>
<vcpupin vcpu='3' cpuset='14'/>
<vcpupin vcpu='4' cpuset='6'/>
<vcpupin vcpu='5' cpuset='16'/>
<vcpupin vcpu='6' cpuset='8'/>
<vcpupin vcpu='7' cpuset='18'/>
</cputune>
<os>
<type arch='x86_64' machine='pc-q35-4.2'>hvm</type>
<loader readonly='yes' type='pflash'>/mnt/user/system/custom_ovmf/Macinabox_CODE-pure-efi.fd</loader>
<nvram>/etc/libvirt/qemu/nvram/50ad9e1d-6b5f-4620-a4a6-1474f68e60bf_VARS-pure-efi.fd</nvram>
</os>
<features>
<acpi/>
<apic/>
</features>
<cpu mode='host-passthrough' check='none' migratable='on'>
<topology sockets='1' dies='1' cores='4' threads='2'/>
<cache mode='passthrough'/>
</cpu>
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/local/sbin/qemu</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='writeback'/>
<source file='/mnt/disk2/domains/Macinabox Mojave/macos_disk.img'/>
<target dev='hdc' bus='sata'/>
<boot order='1'/>
<address type='drive' controller='0' bus='0' target='0' unit='2'/>
</disk>
<controller type='pci' index='0' model='pcie-root'/>
<controller type='pci' index='1' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='1' port='0x8'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0' multifunction='on'/>
</controller>
<controller type='pci' index='2' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='2' port='0x9'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<controller type='pci' index='3' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='3' port='0xb'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x3'/>
</controller>
<controller type='pci' index='4' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='4' port='0x13'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x3'/>
</controller>
<controller type='pci' index='5' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='5' port='0xa'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='6' model='pcie-to-pci-bridge'>
<model name='pcie-pci-bridge'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</controller>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
</controller>
<controller type='sata' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
</controller>
<controller type='usb' index='0' model='ich9-ehci1'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x7'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x1'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
<master startport='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x2'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:8f:a9:e9'/>
<source bridge='br0'/>
<model type='e1000-82545em'/>
<address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
</interface>
<serial type='pty'>
<target type='isa-serial' port='0'>
<model name='isa-serial'/>
</target>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<channel type='unix'>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='tablet' bus='usb'>
<address type='usb' bus='0' port='1'/>
</input>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
</source>
<rom file='/mnt/user/isos/vbios/wx4100.rom'/>
<address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x05' slot='0x00' function='0x1'/>
</source>
<address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='usb' managed='no'>
<source>
<vendor id='0x248a'/>
<product id='0x8367'/>
</source>
<address type='usb' bus='0' port='2'/>
</hostdev>
<memballoon model='none'/>
</devices>
<qemu:commandline>
<qemu:arg value='-usb'/>
<qemu:arg value='-device'/>
<qemu:arg value='usb-kbd,bus=usb-bus.0'/>
<qemu:arg value='-device'/>
<qemu:arg value='************************'/>
<qemu:arg value='-smbios'/>
<qemu:arg value='type=2'/>
<qemu:arg value='-cpu'/>
<qemu:arg value='Penryn,kvm=on,vendor=GenuineIntel,+invtsc,vmware-cpuid-freq=on,+pcid,+ssse3,+sse4.2,+popcnt,+avx,+aes,+xsave,+xsaveopt,check'/>
</qemu:commandline>
</domain>
Logs:
-rtc base=utc,driftfix=slew \
-global kvm-pit.lost_tick_policy=delay \
-no-hpet \
-no-shutdown \
-boot strict=on \
-device pcie-root-port,port=0x8,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x1 \
-device pcie-root-port,port=0x9,chassis=2,id=pci.2,bus=pcie.0,addr=0x1.0x1 \
-device pcie-root-port,port=0xb,chassis=3,id=pci.3,bus=pcie.0,addr=0x1.0x3 \
-device pcie-root-port,port=0x13,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3 \
-device pcie-root-port,port=0xa,chassis=5,id=pci.5,bus=pcie.0,addr=0x1.0x2 \
-device pcie-pci-bridge,id=pci.6,bus=pci.1,addr=0x0 \
-device ich9-usb-ehci1,id=usb,bus=pcie.0,addr=0x7.0x7 \
-device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pcie.0,multifunction=on,addr=0x7 \
-device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pcie.0,addr=0x7.0x1 \
-device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pcie.0,addr=0x7.0x2 \
-device virtio-serial-pci,id=virtio-serial0,bus=pci.2,addr=0x0 \
-blockdev '{"driver":"file","filename":"/mnt/disk2/domains/Macinabox Mojave/macos_disk.img","node-name":"libvirt-1-storage","cache":{"direct":false,"no-flush":false},"auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-1-format","read-only":false,"cache":{"direct":false,"no-flush":false},"driver":"raw","file":"libvirt-1-storage"}' \
-device ide-hd,bus=ide.2,drive=libvirt-1-format,id=sata0-0-2,bootindex=1,write-cache=on \
-netdev tap,fd=33,id=hostnet0 \
-device e1000-82545em,netdev=hostnet0,id=net0,mac=52:54:00:8f:a9:e9,bus=pci.3,addr=0x0 \
-chardev pty,id=charserial0 \
-device isa-serial,chardev=charserial0,id=serial0 \
-chardev socket,id=charchannel0,fd=34,server,nowait \
-device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 \
-device usb-tablet,id=input0,bus=usb.0,port=1 \
-device vfio-pci,host=0000:05:00.0,id=hostdev0,bus=pci.4,addr=0x0,romfile=/mnt/user/isos/vbios/wx4100.rom \
-device vfio-pci,host=0000:05:00.1,id=hostdev1,bus=pci.5,addr=0x0 \
-device usb-host,hostbus=1,hostaddr=3,id=hostdev2,bus=usb.0,port=2 \
-usb \
-device usb-kbd,bus=usb-bus.0 \
-device '************************' \
-smbios type=2 \
-cpu Penryn,kvm=on,vendor=GenuineIntel,+invtsc,vmware-cpuid-freq=on,+pcid,+ssse3,+sse4.2,+popcnt,+avx,+aes,+xsave,+xsaveopt,check \
-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
-msg timestamp=on
2021-07-27 20:32:02.303+0000: Domain id=3 is tainted: high-privileges
2021-07-27 20:32:02.303+0000: Domain id=3 is tainted: custom-argv
2021-07-27 20:32:02.303+0000: Domain id=3 is tainted: host-cpu
char device redirected to /dev/pts/1 (label charserial0)