problem with disk virtio driver

[Andrei Perietanu <andrei.perietanu@xxxxxxxxxxxxxxx>]

I just ran into a problem I can't make heads or tails of, so I'm hoping to get some help here.

I have a custom built Embedded Linux running qemu-kvm  1.1.2 and libvirt 1.2.20

I'm creating a domain with the following config:

<domain type='kvm'>

  <name>myVM</name>  

  <memory unit='KiB'>2097152</memory>  

  <vcpu placement='static'>2</vcpu>  

  <os>

    <type arch='x86_64'>hvm</type>

    <boot dev='hd'/>  

    <boot dev='cdrom'/>    

  </os>

  <features>

    <acpi/>

    <apic/>

  </features>

  <cpu mode='host-model'/>

  <clock offset='utc'>

    <timer name='rtc' tickpolicy='catchup'/>

    <timer name='pit' tickpolicy='delay'/>

    <timer name='hpet' present='no'/>

  </clock>

  <on_poweroff>destroy</on_poweroff>

  <on_reboot>restart</on_reboot>

  <on_crash>restart</on_crash>  

  <devices>

    <disk type='file' device='cdrom'>

      <driver name='qemu' type='raw'/>

      <target dev='hdb' bus='ide'/>

      <source file='custom.iso'/>

      <readonly/>

      

    </disk>

    <disk type='file' device='disk'>

      <driver name='qemu' type='qcow2'/>

      <source file='/path/to/vdisk.img'/>

      <target dev='vda' bus='virtio'/>      

    </disk>

    <controller type='pci' model='pci-root'/>

    <controller type='usb'/>

    <controller type='ide'/>

   <interface type='bridge'>

      <source bridge='virbr0'/>      

      <model type='virtio'/>

    </interface>

   

    <serial type='pty'>

      <target port='0'/>

    </serial>

    <console type='pty'>

      <target type='serial' port='0'/>

    </console>

    <input type='tablet' bus='usb'/>

    <input type='mouse' bus='ps2'/>

    <input type='keyboard' bus='ps2'/>

    <graphics type='vnc' port='-1' autoport='yes'/>

    <video>

      <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/>

    </video>

    <watchdog model='i6300esb' action="">

    <memballoon model='none'/>   

  </devices>

</domain>

Granted the OS I'm installing is again a custom Linux with some software running on top ..so It's not a well known OS...but I'm hoping that does not matter much. 

After installation I get all sorts of kernel panics and errors about services not being able to start. 

So I tried the same thing on ubuntu 14.04.2 LTS which installed qemu-kvm 2.0.0 and libvirt 1.2.2

Same config xml, but this time it worked better -I was not getting the kernel panics.

The OS I'm installing does not support IDE disks, it needs a virtio disk.

The obvious solution here would be to try and get a newer version of qemu, but since we're talking about a custom built Linux I'd have to add the package manually and compile from source...which cakes a long time to do. So before attempting that....just wondering....is there a better way? Anything I can try?

 

Thanks,

Andrei

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