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Date: Fri, 6 Jan 2017 13:05:46 -0800
From: Guenter Roeck <linux@roeck-us.net>
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Subject: Re: [Qemu-devel] Problems with qemu "modern" virtio on sparc64
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To: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Cc: "qemu-devel@nongnu.org >> QEMU Developers" <qemu-devel@nongnu.org>, "Michael S. Tsirkin" <mst@redhat.com>

On Fri, Jan 06, 2017 at 07:42:19PM +0000, Mark Cave-Ayland wrote:
> On 06/01/17 18:34, Guenter Roeck wrote:
> 
> > On Fri, Jan 06, 2017 at 05:04:58PM +0000, Mark Cave-Ayland wrote:
> >> On 30/12/16 19:57, Guenter Roeck wrote:
> >>
> >> Disabling "modern" mode enables boot to proceed as normal:
> >>
> >> $ ./qemu-system-sparc64 \
> >> -drive
> >> file=debian-9.0-sparc64-NETINST1.iso,if=none,index=0,id=cd,media=cdrom \
> >> -device virtio-blk-pci,disable-modern=on,drive=cd \
> >> -nographic \
> >> -bios openbios-builtin.elf.nostrip \
> >> -m 256
> >>
> > ...
> >>
> >> Guenter, can you try a similar command line and confirm whether it fixes
> >> the issue for you under QEMU 2.7 and 2.8? I have no idea as to why the
> >> difference in legacy/non-legacy codepaths should crash the kernel though.
> >>
> > Unfortunately, my qemu command line wizard capabilities are somewhat lacking.
> > I had tried that before, but just could not figure out how to change my command
> > line to include "disable-modern=on". If you have an idea, please let me know.
> > Here it is:
> > 
> > ${QEMU} -M ${mach} -cpu "${cpu}" -m 512 \
> > 	        -drive file=${rootfs},if=virtio \
> > 		-net nic,model=virtio \
> > 		-kernel arch/sparc/boot/image -no-reboot \
> > 		-append "root=/dev/vda init=/sbin/init.sh console=ttyS0" \
> > 		-nographic 
> 
> If you apply the same principles from my example above to your command
> line then you should end up with something like:
> 
> ${QEMU} -M ${mach} -cpu "${cpu}" -m 512 \
>         -drive file=${rootfs},if=none,id=hd \
> 	-device virtio-blk-pci,disable-modern=on,drive=hd \
> 	-net nic,model=virtio \
> 	-kernel arch/sparc/boot/image -no-reboot \
> 	-append "root=/dev/vda init=/sbin/init.sh console=ttyS0" \
> 	-nographic
> 
That works, but only if I drop "-net nic,model=virtio". Otherwise I get
the same crash again. Any idea how to set the network configuration
the same way ?

Thanks,
Guenter