Re: "guix system vm" to libvirt XML domain

[Giovanni Biscuolo <g@xelera.eu>]

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Hi Gabor,

thanks for your interest

Gábor Boskovits <boskovits@gmail.com> writes:

[...]

>> but now I've a problem with the /gnu/store mount in guest
>>
>> "9pnet_virtio: no channels available for device TAGjoptajej2oynju6yvboauz7pl6uj"
>>
>> ...still missimg someting
>>
>> any hint please?
>>
>
> I have seen this once, and the virtio-pci kernel module was missing.

I had excluded this since starting the VM using the "guix system vm"
generated script succeeds, I expect the libvirt defined one to run alike

long story short: my domain XML definition was *wrong*, I defined the
/gnu/store filesystem

--8<---------------cut here---------------start------------->8---
  <filesystem type='mount' accessmode='passthrough'>
    <driver type='path' wrpolicy='immediate'/>
    <source dir='/gnu/store'/>
    <target dir='TAGjoptajej2oynju6yvboauz7pl6uj'/>
  </filesystem>
--8<---------------cut here---------------end--------------->8---

in the wrong part of the XML tree, namely outside

--8<---------------cut here---------------start------------->8---
<devices>
[...]
</devices>
--8<---------------cut here---------------end--------------->8---

and virsh ignored it (no error, no warning) when I used that XML to
define the VM via "virsh ... define cointainer-minimal.xml" [1]

hint: always use virsh-xml-validate to check the file, since virsh does
not validate it before registering the definition (AFAIK "virsh define"
also hasn't a proper flag to do it)

this is the correct XML domain definition, now working:

[-- Attachment #2: container-minimal-fixed.xml --]
[-- Type: application/xml, Size: 2431 bytes --]

<domain type='kvm' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
  <name>container-minimal</name>
  <uuid>ecfe2538-5315-44aa-bba5-8fe4d86d5397</uuid>
  <memory unit='GB'>2</memory>
  <currentMemory unit='GB'>2</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <os>
    <type arch='x86_64' machine='pc-i440fx-2.8'>hvm</type>
    <kernel>/gnu/store/y5aiijqiqna1y8ypn6c0jp367813xxnc-linux-libre-4.20.3/bzImage</kernel>
    <initrd>/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system/initrd</initrd>
    <cmdline>--root=/dev/vda1 --system=/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system --load=/gnu/store/9xgqs9zf51i9binqjl5hgl8gl7ql40hc-system/boot</cmdline>
  </os>
  <features>
    <acpi/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>destroy</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/gnu/store/4pnx934k40wni57r5swj2kr29l1j549f-qemu-3.1.0/bin/qemu-system-x86_64</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='writeback' error_policy='report'/>
      <source file='/gnu/store/4mz1qqv7h5g5885q1aq0izlmy01knf1g-qemu-image'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
      <readonly/>
    </disk>
    <filesystem type='mount' accessmode='passthrough'>
      <driver type='path' wrpolicy='immediate'/>
      <source dir='/gnu/store'/>
      <target dir='TAGjoptajej2oynju6yvboauz7pl6uj'/>
    </filesystem>
    <controller type='usb' index='0' model='piix3-uhci'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'/>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <graphics type='spice' port='3003' autoport='no' listen='127.0.0.1'>
      <listen type='address' address='127.0.0.1'/>
    </graphics>
    <video>
      <model type='qxl' ram='65536' vram='16384' vgamem='16384' heads='1' primary='yes'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='none'/>
    <rng model='virtio'>
     <backend model='random'>/dev/urandom</backend>
    </rng>
    <interface type='network'>
     <mac address='52:54:00:ae:72:b9'/>
     <source network='gblabs'/>
     <model type='rtl8139'/>
   </interface>
  </devices>
</domain>

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hope this will help others!

happy hacking!
Giovanni

[...]

[1] /var/log/libvirt/qemu/container-minimal.log was helpful since the
command line used to start the VM lacked 


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-- 
Giovanni Biscuolo

Xelera IT Infrastructures

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