From:
https://github.com/tianocore/tianocore.github.io/wiki/Testing-SMM-with-QEMU,-KVM-and-libvirt#uefi-variable-access-test

#----------------------------------------------------
[root@f26-ovmf-vm2 ~]# time taskset -c 0 efibootmgr
BootCurrent: 0001
Timeout: 0 seconds
BootOrder: 0001,0000
Boot0000* UiApp
Boot0001* Fedora

real    0m0.014s
user    0m0.001s
sys     0m0.008s
#----------------------------------------------------
[root@f26-ovmf-vm2 ~]# time taskset -c 1 efibootmgr
BootCurrent: 0001
Timeout: 0 seconds
BootOrder: 0001,0000
Boot0000* UiApp
Boot0001* Fedora

real    0m0.009s
user    0m0.000s
sys     0m0.008s
[root@f26-ovmf-vm2 ~]# 
#----------------------------------------------------