Re: [Qemu-devel] Problems with qemu "modern" virtio on sparc64

[Michael S. Tsirkin]

On Fri, Jan 06, 2017 at 01:05:46PM -0800, Guenter Roeck wrote:
> 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


Replace it with -device virtio-net-pci.

-- 
MST