After upgrading from Proxmox 7 to Proxmox 8, my VM with macOS Ventura no longer functions


New Member
May 27, 2022
After upgrading from Proxmox 7 to Proxmox 8, my VM with macOS Ventura no longer functions. I had a working system with PCI passthrough, passing through an AMD graphics card and a PCI USB3 card. This setup was working fine until the upgrade to Proxmox 8, after which I encountered a boot loop.

Opencore still starts and selects the correct partition for booting. I can see the boot process in verbose mode, but then the process restarts. Do you have any tips on what settings I need to change in the VM configuration?

do you use these kernel parameters on your host?
"clocksource=tsc tsc=reliable"
This fixed most of the issues I had with MacOS Virtualization.

Does this also happen when not using PCI pass through?
I have now tried these settings, but unfortunately, nothing changes. When I remove the passed-through hardware, Ventura starts successfully.

Has anyone successfully run macOS Ventura with PCI passthrough on Proxmox 8?
I have no experience with this, but try setting the Machine Version back to 7.2 instead of Latest? Maybe the OS does not like virtual hardware changes.
Unfortunately, that doesn't change anything either. But now I've tried further.
The PCI USB card can be passed through. Only when I pass the graphics card does the VM no longer start. The graphics card settings are the same as in proxmox 7. It therefore seems certain to me that something must have changed here after the update to proxmox 8 and therefore maxos no longer starts.
Could you maybe provide your vm config?
qm config [vmid]
Here is my config.

args: -device isa-applesmc,osk="ourhardworkbythesewordsguardedpleasedontsteal(c)AppleComputerInc" -smbios type=2 -device usb-kbd,bus=ehci.0,port=2 -global nec-usb-xhci.msi=off -global ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off -cpu host,vendor=GenuineIntel,+invtsc,+hypervisor,kvm=on,vmware-cpuid-freq=on

bios: ovmf

boot: order=virtio1;net0

cores: 8

cpu: host

description: Venura

efidisk0: local-lvm:vm-1302-disk-0,efitype=4m,size=4M

hostpci0: 0000:01:00,x-vga=1

hostpci1: 0000:05:00

hostpci2: 0000:04:00,pcie=1

hostpci3: 0000:00:14,pcie=1

machine: q35

memory: 16384

meta: creation-qemu=7.1.0,ctime=1670237351

name: MacOsVentura250gb

net0: vmxnet3=1E:22:50:D5:03:B3,bridge=vmbr0,firewall=1

numa: 0

ostype: other

scsihw: virtio-scsi-pci

smbios1: uuid=f0023735-491a-4641-aecb-53f74ac5f198

sockets: 1

tags: mit-gpu

vga: none

virtio1: local-lvm:vm-1302-disk-1,cache=unsafe,iothread=1,size=250G

vmgenid: 48d2ccb1-eb45-4ea2-bbde-97c199f0ef83
Do you still have the old 5.15 kernel from pve7?
You could try booting the old kernel and see if anything changes.
And like @leesteken said you could change the machine version to 7.2.
I have already changed the type to 7.2. Unfortunately that doesn't help.

How do I boot into the old kernel?

I have 1 SSD with proxmox 7 on which I updated to version 8.
I freshly installed proxmox 8 on another SSD and restored a backup of the macos Ventura VM. Ventura will not start on either system.

On a 3rd SSD I have the old proxmox 7 version on which everything works.
On the ssd where you have made the upgrade, you should still have the old kernels if you did not remove them.
Usually you can select the old kernel in the grub/systemd-boot menu under "advanced options".


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