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

[Mark Cave-Ayland]

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


ATB,

Mark.