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Troubleshoot your troubles
Where is the log?
The logs are stored in /var/log/libvirt/qemu/vm_name.log, where vm_name is the name of the VM you're trying to boot.
By reading the few lines at the bottom of the log file, you get general idea of what might be an issue.
warning: host doesn't support requested feature, what is this?
This warning usually means that the feature guest is requesting is not available on host.
After the warning message, on same line, you'll see something like MSR(490H).vmx-entry-load-perf-global-ctrl
That's the feature it's missing, but I have no idea what most of them indicate.
If you've set Firmware for VM to BIOS, change to UEFI.
In the cpu section in log file, you might see something like this:
-cpu Skylake,vme=on,ss=on,vmx=on,...
Make sure you've set host-passthrough CPU model which'll produce -cpu host,... instead.
If it doesn't, I don't have any other ideas.