This is cleaner attempt to fix -boot once=X behaviour on sPAPR
qemu-system-ppc64 -m 1024 -enable-kvm -boot once=d -vga none -nographic
Ready!
0 > dev /chosen ok
0 > .properties
stdout 3e512100
....
ibm,architecture-vec-5 00000000 0080
qemu,boot-device d
6400
linux,stdout-path /vdevice/vty@71000000
....
0 > reset-all
....
Ready!
0 > dev /chosen ok
0 > .properties
stdout 3e512100
....
ibm,architecture-vec-5 00000000 0080
linux,stdout-path /vdevice/vty@71000000
Compared to previous patch set, this one doesn't implement register_boot_set
for sPAPR,
but instead updates boot_order at MachineState and read it on each guest's
reset.
