On Tue, Dec 09, 2025 at 09:34:11AM +0100, Christian Zigotzky wrote:
>
>
> > On 09 December 2025 at 07:01 am, Gautam Menghani <[email protected]>
> > wrote:
> >
> > On Mon, Dec 08, 2025 at 07:06:14AM +0100, Christian Zigotzky wrote:
> >>
> >>>> On 08 December 2025 at 06:51 am, Gautam Menghani <[email protected]>
> >>>> wrote:
> >>>
> >>> Hi Christian,
> >>>
> >>> Thanks for the report. Can you also please share the QEMU command line
> >>> you were using? That would be helpful.
> >>>
> >>> Thanks,
> >>> Gautam
> >>
> >> Hi Gautam,
> >>
> >> Here is the command line:
> >>
> >> qemu-system-ppc64 -M ppce500 -cpu e5500 -m 1024 -kernel uImage -drive
> >> format=raw,file=void-live-powerpc-20230317.img,index=0,if=virtio -netdev
> >> user,id=mynet0 -device virtio-net,netdev=mynet0 -append "rw root=/dev/vda"
> >> -device virtio-gpu-pci -device virtio-mouse-pci -device
> >> virtio-keyboard-pci -device pci-ohci,id=newusb -audiodev
> >> id=sndbe,driver=pa,server=/run/user/1000/pulse/native -device
> >> usb-audio,bus=newusb.0 -enable-kvm -smp 4 -fsdev
> >> local,security_model=passthrough,id=fsdev0,path=/home/amigaone/Music
> >> -device virtio-9p-pci,id=fs0,fsdev=fsdev0,mount_tag=hostshare -display gtk
> >
> >
> > Were you running a KVM guest? Did you see the problem with the latest
> > kernel installed in the guest?
>
> Yes, the latest git kernel doesn’t boot.
>
> But the final kernel 6.18.0 boots without any problems.
I tried booting a TCG ppce500 guest with your config and I can see that
the commit 2997876c4a1a5 causes a boot failure. Reverting it works fine.
Command line used:
qemu-system-ppc64 -M ppce500 -cpu e5500 -smp 1 -m 4G \
-display none -serial stdio \
-kernel /home/gautam/src/linux/arch/powerpc/boot/uImage \
-drive
file=/home/gautam/src/qemu-ppc-boot/buildroot/qemu_ppc64_e5500-latest/rootfs.ext2,if=virtio,format=raw
\
-append "console=ttyS0 rootwait root=/dev/vda" \
But I was not able to boot a KVM guest on top of this TCG guest. I even
went back all the way to 5.15
./qemu-system-ppc64 \
-M ppce500 -cpu e5500 \
--enable-kvm \
-m 1024 -kernel uImage \
-drive file=/tmp/rootfs.ext2,if=virtio,format=raw \
-append "console=ttyS0 rootwait root=/dev/vda" -serial mon:stdio
-nographic
Bad kernel stack pointer fffff8 at 0
Oops: Bad kernel stack pointer, sig: 6 [#1]
BE PAGE_SIZE=4K SMP NR_CPUS=4 QEMU e500
Modules linked in:
CPU: 0 UID: 0 PID: 1508 Comm: qemu-system-ppc Not tainted
6.18.0-a4-powerpc64-smp #45 VOLUNTARY
Hardware name: QEMU ppce500 e5500 0x80240020 QEMU e500
NIP: 0000000000000000 LR: 0000000000000000 CTR: 0000000000000000
REGS: c00000003fffbd20 TRAP: 0400 Not tainted (6.18.0-a4-powerpc64-smp)
MSR: 0000000010000000 <> CR: 00000000 XER: 00000000
IRQMASK: 0
GPR00: 0000000000000000 0000000000fffff8 0000000000000000 0000000002c00000
GPR04: 0000000000000000 0000000000000000 0000000045504150 0000000004000000
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
NIP [0000000000000000] 0x0
LR [0000000000000000] 0x0
Call Trace:
Code: XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
---[ end trace 0000000000000000 ]---
note: qemu-system-ppc[1508] exited with irqs disabled
Thanks,
Gautam
