This is an attempts to boot a pseries guest without a firmware. The idea is to boot a VM with petitboot as a more powerful boot loader and eliminate scanning phase of the SLOF booting process.
This provides environment without SLOF but with the device tree and few modifications to already existing H_CAS and H_RTAS hypeprcalls. This is made on top of these 2 patches: spapr: Stop providing RTAS blob spapr_pci: Advertise BAR reallocation capability This requires a modified pseries kernel, posted separately as "powerpc/pseries: Kexec style boot". This also requires patched kexec-lite from the openpower build as currently it requires linux,rtas-base and rtas-size properties in the DT which we won't have in such environment. 1/1 is not necessary but having vmlinux at 0 helps debugging via the qemu gdb stub easier. The example command line is: /home/aik/pbuild/qemu-killslof-localhost-ppc64/ppc64-softmmu/qemu-system-ppc64 \ -nodefaults \ -chardev stdio,id=STDIO0,signal=off,mux=on \ -device spapr-vty,id=svty0,reg=0x71000110,chardev=STDIO0 \ -mon id=MON0,chardev=STDIO0,mode=readline -nographic -vga none \ -enable-kvm \ -device nec-usb-xhci,id=nec-usb-xhci0 -m 4G \ -kernel /home/aik/pbuild/kernel-guest-nv2-le/vmlinux \ -initrd op-build/output/images/rootfs.cpio \ -machine pseries,bios=no,cap-cfpc=broken,cap-sbbc=broken,cap-ibs=broken \ -snapshot \ -netdev "tap,id=TAP0,helper=/home/aik/qemu-bridge-helper --br=br0" \ -device \ "virtio-net-pci,id=vnet0,bus=pci.0,addr=1.0,mac=C0:41:49:4b:00:02,netdev=TAP0" \ -device virtio-scsi-pci,id=vscsi0 \ -drive \ id=DRIVE0,if=none,file=pbuild/__img/u1804-64le-killslof.qcow2,format=qcow2 \ -device scsi-disk,id=scsi-disk0,drive=DRIVE0 \ -smp 8,threads=8 \ -L /home/aik/t/qemu-ppc64-bios/ \ -trace events=qemu_trace_events -d guest_errors \ -chardev socket,id=SOCKET0,server,nowait,path=qemu.mon.mac02 \ -mon chardev=SOCKET0,mode=control This is based on sha1 216965b20b04 Joel Stanley "ppc/pnv: update skiboot to v6.4". Please comment. Thanks. Alexey Kardashevskiy (4): spapr: Allow changing kernel loading address spapr: Allow bios-less configuration spapr: Advertise H_RTAS to the guest spapr: Implement SLOF-less client_architecture_support include/hw/ppc/spapr.h | 7 +++ hw/ppc/spapr.c | 118 ++++++++++++++++++++++++++++++++--------- hw/ppc/spapr_hcall.c | 49 +++++++++++++++-- 3 files changed, 146 insertions(+), 28 deletions(-) -- 2.17.1
