How to start Xorg for a OpenBSD VM running in QEMU

I'm running an OpenBSD (current version) virtual machine under QEMU/KVM (amd64 architecture) + SDL for display.

QEMU command to start my OpenBSD VM:

I'm trying to start a graphical session with Xorg server. When using OpenBSD xenodm Display manager with XFCE DE, my X session starts without issue.

$HOME/.xession file to start XFCE:

If I try to start my graphical session directly with the startx command, I have some errors (no screens found) and it doesn't start.

Logs for Xorg with errors: