[fedora-virt] How to use virtio-scsi on F17 host and F17 guest

[Paolo Bonzini]

Il 08/06/2012 14:51, Kevin Wolf ha scritto:
> Am 08.06.2012 14:25, schrieb Kashyap Chamarthy:
>> (Sorry for the double email, previously. I thought it didn't went through, and re-sent it.)
>>
>> On 06/08/2012 03:02 PM, Kevin Wolf wrote:
>>> Am 07.06.2012 19:50, schrieb Kashyap Chamarthy:
>>>> A related question:
>>>>
>>>> A while ago, I was using just bare qemu-kvm to invoke an f16 kernel to test virtio-scsi:
>>>>
>>>> qemu-kvm invocation:
>>>> #---------------------------------------------------#
>>>> # /usr/bin/qemu-kvm \
>>>>  -device virtio-scsi-pci,id=scsi \
>>>>  -enable-kvm \
>>>>  -nographic -nodefconfig -nodefaults \
>>>>  -chardev stdio,id=charserial0 \
>>>>  -device isa-serial,chardev=charserial0,id=serial0 \
>>>>  -device sga \
>>>>  -kernel vmlinuz-3.2.7-1.fc16.x86_64 \
>>>>  -initrd initramfs-3.2.7-1.fc16.x86_64.img \
>>>>  -append "console=ttyS0"
>>>> #---------------------------------------------------#
>>>
>>> You're only adding the virtio-scsi controller here, but no disks, so
>>> your guest can't find its root file system. I think you need to add:
>>>
>>> -drive file=disk.img,if=none,id=sda
>>> -device scsi-disk,bus=scsi.0,drive=sda
>>
>>
>> Um, with passing the disk image(which has f16) explicitly, it still complaints can't find
>> the root= argument.
> 
> Well, maybe you need to pass the root=... parameter in -append then. :-)
> 
> What it needs to be exactly depends on your setup. The GRUB
> configuration on the guest should tell you the right value.
> 
> Or am I missing some additional requirement, Paolo?

No, I think you're right.  If the kernel command-line uses UUIDs for the
root image, the same image can usually switch transparently among
IDE/virtio-scsi/virtio-blk.

Paolo