Since Monterey, your host must have a working TSC (timestamp counter), because otherwise if you give the VM more than one core, macOS will observe the skew between cores and **kernel/memory panic** when it sees time ticking backwards. To check this, on Proxmox run:
```
dmesg | grep -i -e tsc -e clocksource
...
# for working host must be:
...
clocksource: Switched to clocksource tsc
...
# for broken host could be:
tsc: Marking TSC unstable due to check_tsc_sync_source failed
clocksource: Switched to clocksource hpet
```
Below is a possible workaround from here: https://www.nicksherlock.com/2022/10/installing-macos-13-ventura-on-proxmox/comment-page-1/#comment-55532
1. Try to turn off “ErP mode” or any C state power saving modes your BIOS supports and poweroff/poweron device (including physical cable). It could help host OS to init TSC correctly, but no guarantee.
2. Or try to activate TSC force in GRUB by adding boot flags `clocksource=tsc tsc=reliable` in the `GRUB_CMDLINE_LINUX_DEFAULT` and call `update-grub`. In this case host OS probably could work unstable in some cases.
3. Check the current TSC by call `cat /sys/devices/system/clocksource/clocksource0/current_clocksource` must be `tsc`.
