libvirt users - Apr 2010 - Problems moving qemu machine to libvirt

Hi all,

I have a qemu-system-arm machine that I am currently starting using:

    qemu-system-arm -M versatilepb -nographic \
      -hda img.qcow2 \
      -net vde,vlan=0,sock=/var/run/qemu-vde.ctl \
      -net nic,vlan=0,macaddr=52:54:00:12:34:22  \
      -kernel vmlinuz-2.6.18-6-versatile \
      -initrd initrd.img-2.6.18-6-versatile \
      -append "root=/dev/sda1 console=ttyAMA0,115200n8"

I converted the above to a virsh XML file using:

    virsh domxml-from-native qemu-argv run.argc > arm32.xml

which resulted in this (minor modifications to provide full paths):

    <domain type='qemu'>
      <name>arm32</name>
      <uuid>e433002b-107f-5b16-415b-7afb3e3a4d84</uuid>
      <memory>262144</memory>
      <currentMemory>262144</currentMemory>
      <vcpu>1</vcpu>
      <os>
        <type arch='arm'
machine='versatilepb'>hvm</type>
        <kernel>/kvm/arm32/vmlinuz-2.6.18-6-versatile</kernel>
        <initrd>/kvm/arm32/initrd.img-2.6.18-6-versatile</initrd>
      </os>
      <features>
        <acpi/>
      </features>
      <clock offset='utc'/>
      <on_poweroff>destroy</on_poweroff>
      <on_reboot>restart</on_reboot>
      <on_crash>destroy</on_crash>
      <devices>
        <emulator>/kvm/arm32/arm32.sh</emulator>
        <disk type='file' device='disk'>
          <source file='/kvm/arm32/img.qcow2'/>
          <target dev='hda' bus='ide'/>
          <address type='drive' controller='0'
bus='0' unit='0'/>
        </disk>
        <controller type='ide' index='0'/>
        <serial type='pty'>
          <target port='0'/>
        </serial>
        <console type='pty'>
          <target port='0'/>
        </console>
      </devices>
    </domain>

Since libvirt doesn't support VDE networking I use a wrapper around
qemu-system-arm (/kvm/arm32/arm32.sh) containing:

    #!/bin/bash
    exec /usr/bin/qemu-system-arm $@ \
	-net nic,vlan=0,macaddr=52:54:00:12:34:22 \
	-net vde,vlan=0,group=vde2-net,mode=0770,sock=/var/run/qemu-vde.ctl \
	-append "root=/dev/sda1 console=ttyAMA0,115200n8"

However, doing this I get the following error when I attempt to start
the VM:

    error: Failed to start domain arm32
    error: internal error Process exited while reading console log output:
           char device redirected to /dev/pts/10
    qemu: could not open disk image console=ttyAMA0,115200n8\"":
           No such file or directory

The first problem (console log output) is probably due to the second,
where it seems that this:

    <cmdline>root=/dev/sda1 console=ttyAMA0,115200n8</cmdline>

is not being passed to qemu correctly. I have tried quoting the command
line but that doesn't help.

Anyone have any clues?

Cheers,
Erik
-- 
----------------------------------------------------------------------
Erik de Castro Lopo
http://www.mega-nerd.com/

On Sun, Apr 25, 2010 at 01:03:42AM +1000, Erik de Castro Lopo
wrote:
> Hi all,
> 
> I have a qemu-system-arm machine that I am currently starting using:
> 
>     qemu-system-arm -M versatilepb -nographic \
>       -hda img.qcow2 \
>       -net vde,vlan=0,sock=/var/run/qemu-vde.ctl \
>       -net nic,vlan=0,macaddr=52:54:00:12:34:22  \
>       -kernel vmlinuz-2.6.18-6-versatile \
>       -initrd initrd.img-2.6.18-6-versatile \
>       -append "root=/dev/sda1 console=ttyAMA0,115200n8"
> 
> I converted the above to a virsh XML file using:
> 
>     virsh domxml-from-native qemu-argv run.argc > arm32.xml
> 
> which resulted in this (minor modifications to provide full paths):
> 
>     <domain type='qemu'>
>       <name>arm32</name>
>       <uuid>e433002b-107f-5b16-415b-7afb3e3a4d84</uuid>
>       <memory>262144</memory>
>       <currentMemory>262144</currentMemory>
>       <vcpu>1</vcpu>
>       <os>
>         <type arch='arm'
machine='versatilepb'>hvm</type>
>         <kernel>/kvm/arm32/vmlinuz-2.6.18-6-versatile</kernel>
>        
<initrd>/kvm/arm32/initrd.img-2.6.18-6-versatile</initrd>
>       </os>
>       <features>
>         <acpi/>
>       </features>
>       <clock offset='utc'/>
>       <on_poweroff>destroy</on_poweroff>
>       <on_reboot>restart</on_reboot>
>       <on_crash>destroy</on_crash>
>       <devices>
>         <emulator>/kvm/arm32/arm32.sh</emulator>
>         <disk type='file' device='disk'>
>           <source file='/kvm/arm32/img.qcow2'/>
>           <target dev='hda' bus='ide'/>
>           <address type='drive' controller='0'
bus='0' unit='0'/>
>         </disk>
>         <controller type='ide' index='0'/>
>         <serial type='pty'>
>           <target port='0'/>
>         </serial>
>         <console type='pty'>
>           <target port='0'/>
>         </console>
>       </devices>
>     </domain>
> 
> Since libvirt doesn't support VDE networking I use a wrapper around
> qemu-system-arm (/kvm/arm32/arm32.sh) containing:
> 
>     #!/bin/bash
>     exec /usr/bin/qemu-system-arm $@ \
> 	-net nic,vlan=0,macaddr=52:54:00:12:34:22 \
> 	-net vde,vlan=0,group=vde2-net,mode=0770,sock=/var/run/qemu-vde.ctl \
> 	-append "root=/dev/sda1 console=ttyAMA0,115200n8"
> 
> However, doing this I get the following error when I attempt to start
> the VM:
> 
>     error: Failed to start domain arm32
>     error: internal error Process exited while reading console log output:
>            char device redirected to /dev/pts/10
>     qemu: could not open disk image console=ttyAMA0,115200n8\"":
>            No such file or directory
> 
> The first problem (console log output) is probably due to the second,
> where it seems that this:
> 
>     <cmdline>root=/dev/sda1 console=ttyAMA0,115200n8</cmdline>
> 
> is not being passed to qemu correctly. I have tried quoting the command
> line but that doesn't help.
In your wrapper I think you need  "$@" instead of $@


Daniel
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