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 as host, running qemu-kvm  1.1.2 and
libvirt 1.2.20

I'm creating a domain with the following config:

<domain type='kvm'>
  <memory unit='KiB'>2097152</memory>
  <vcpu placement='static'>2</vcpu>
    <type arch='x86_64'>hvm</type>
    <boot dev='hd'/>
    <boot dev='cdrom'/>
  <cpu mode='host-model'/>
  <clock offset='utc'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='hpet' present='no'/>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <target dev='hdb' bus='ide'/>
      <source file='custom.iso'/>

    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/path/to/vdisk.img'/>
      <target dev='vda' bus='virtio'/>
    <controller type='pci' model='pci-root'/>
    <controller type='usb'/>
    <controller type='ide'/>
   <interface type='bridge'>
      <source bridge='virbr0'/>
      <model type='virtio'/>

    <serial type='pty'>
      <target port='0'/>
    <console type='pty'>
      <target type='serial' port='0'/>
    <input type='tablet' bus='usb'/>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes'/>
      <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/>
    <watchdog model='i6300esb' action='reset'/>
    <memballoon model='none'/>

Granted the guest 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.

I tried the same thing on ubuntu 14.04.2 LTS (host) 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.

I ran a second test, this time installing ubuntu 14.04 as the guest on both
hosts (ubuntu vs embedded Linux) and again I had problems with which point
to the virtio driver.

On the ubunutu host everyhing was fine
On the Embedded Linux host, the installation failed early on with the error:
   The attempt to mount a file system with type ext4 in Virtual disk1,
partition#1 (vda1) at / failed
If I switch to an ide disk drive instead of virtio, everything works fine.

Thinking it might be because I had an old version of qemu I upgraded qemu
to v 2.6.0. And got the same behavior.

At this point I'm running out of ideas and I'm not sure what else I can
try. Any suggestions are appreciated.



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