Re: [Qemu-ppc] qemu-system-ppc64 hanging occasionally in disk writes

[Alexander Graf]

On 06/15/2012 12:01 AM, Richard W.M. Jones wrote:
> On Thu, Jun 14, 2012 at 11:34:37PM +0200, Alexander Graf wrote:
> > > /home/rjones/d/qemu/ppc64-softmmu/qemu-system-ppc64 \
> > >     -global virtio-blk-pci.scsi=off \
> > >     -nodefconfig \
> > >     -nodefaults \
> > >     -nographic \
> > >     -device virtio-scsi-pci,id=scsi \
> > >     -drive file=test1.img,cache=off,format=raw,id=hd0,if=none \
> > >     -device scsi-hd,drive=hd0 \
> > Don't you have to specify bus= too?
> I don't know.  The identical command line works on x86-64, but I
> don't know if it's correct.
>
> BTW KVM PR now boots the firmware, but fails when it tries to boot our
> (Fedora) guest kernel because of missing emulation of 'ldx':
>
> [764597.404573] Couldn't emulate instruction 0x7fb6502a (op 31 xop 21)
> [764597.404583] kvmppc_emulate_mmio: emulation failed (7fb6502a)
> [768211.269020] Couldn't emulate instruction 0x7fb6502a (op 31 xop 21)
> [768211.269029] kvmppc_emulate_mmio: emulation failed (7fb6502a)
>
> I will try to see if I can fix this and submit a patch if I'm
> successful.

Ugh. Mind to give me a link to your Fedora kernel, so I can check out 
what it's doing? MMIO with 64 bit instructions is slightly unusual and 
rather points to a different error :).


Alex