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Date: Fri, 6 Jan 2017 10:34:36 -0800
From: Guenter Roeck <linux@roeck-us.net>
Message-ID: <20170106183436.GA19862@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 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 

Thanks,
Guenter