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


From: Alexander Graf
Subject: Re: [Qemu-devel] qemu-system-ppc64 hanging occasionally in disk writes
Date: Thu, 28 Jun 2012 16:25:26 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.3) Gecko/20120306 Thunderbird/10.0.3

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




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