This page lists where most of the stuff related to virtualization is located on a Linux operating system. This is based on Fedora. But it should be similar for other distributions.
## UEFI Firmware
* Default location for the x86-64 OVMF (UEFI) firmware
`/usr/share/edk2/ovmf/OVMF_CODE.fd`
* Default location for the x86-64 OVMF (UEFI) secureboot-enabled firmware
`/usr/share/edk2/ovmf/OVMF_CODE.secboot.fd`
### Nvram
* Default location of Nvram
`/var/lib/libvirt/qemu/nvram`
The Nvram contains the saved state of the UEFI configuration.