Le 15/06/2026 à 15:33, BALATON Zoltan a écrit :
On Mon, 15 Jun 2026, Andrew Randrianasulu wrote:
I also tried to see "info registers" as you showed in another email from
2021 where you tried to use kvm-pr on qemu-emulated G5 and it showed
info registers
NIP 0000000000000700 LR 0000000000000000 CTR
0000000000000000 XER 0000000000000000 CPU#0
MSR 8000000000000000 HID0 0000000060000000 HF 8000000000000000 iidx 3
didx
3 TB 00000000 00000000 DECR 0
GPR00 0000000000000000
0000000000000000 0000000000000000 0000000000000000
GPR04 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR08 0000000000000000 0000000000000000
0000000000000000 0000000000000000 GPR12
0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR16 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20 0000000000000000 0000000000000000
0000000000000000 0000000000000000 GPR24
0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR28 0000000000000000 0000000000000000 0000000000000000
0000000000000000
CR 00000000 [ - - - - - - - - ] RES ffffffffffffffff
FPR00 0000000000000000 0000000000000000
0000000000000000 0000000000000000 FPR04
0000000000000000 0000000000000000 0000000000000000 0000000000000000
FPR08 0000000000000000 0000000000000000 0000000000000000
0000000000000000
FPR12 0000000000000000 0000000000000000 0000000000000000 0000000000000000
FPR16 0000000000000000 0000000000000000
0000000000000000 0000000000000000 FPR20
0000000000000000 0000000000000000 0000000000000000 0000000000000000
FPR24 0000000000000000 0000000000000000 0000000000000000
0000000000000000 FPR28 0000000000000000
0000000000000000 0000000000000000 0000000000000000
FPSCR 0000000000000000
SRR0 0000000000000100 SRR1 8000000000080000
PVR
00000000003c0301 VRSAVE 0000000000000000 SPRG0 0000000000000000
SPRG1
0000000000000000 SPRG2 0000000000000000 SPRG3 0000000000000000
SPRG4
0000000000000000 SPRG5 0000000000000000 SPRG6 0000000000000000 SPRG7
0000000000000000
SDR1 0000000000000000 DAR 0000000000000000 DSISR 0000000000000000
(qemu) q
not sure if instruction pointer moved or not ...
looking at some scroll buffer in Termux (I ssh into powermac ) it was at
700 all 3 times I typed "info registers" into qemu monitor.
but this debug msg
[154992.595845] Couldn't emulate instruction 0x00000000 (op 0 xop 0)
[154992.595859] kvmppc_exit_pr_progint: emulation at 100 failed
(00000000)
fills logs FAST!
NIP=0x700 is illegal instruction exception due to trying to execute 0
opcode at 0x100 which is the reset vector but shouldn't it try to start
at 0xfff00100? Maybe there's some issue with setting up KVM correctly?
On powerpc32 it is 0x100 or 0xfff00100 based on whether bit IP
(Interrupt Prefix) is 0 or 1 in MSR register.
On powerpc64 MSR[IP] doesn't exist.
Christophe
You can trace what is executed in TCG with -d in_asm but that does not
work for KVM as it's a TCG debug option. I don't know how to trace
execution with KVM but probably there are some trace points for that.
Maybe you get some info with -trace enable="kvm*" but I don't know how
to understand that output.
Regards,
BALATON Zoltan
