Re: [Xen-users] qcow2 and Xen

[Hans van Kranenburg <hans@xxxxxxxxxxx>]

On 7/17/19 1:18 PM, Stefan Malte Schumacher wrote:
> Hello,
> 
> I went the way of least effort and created a pvh-guest as raw-image with
> xen-tools and then converted it with qemu, which took about 30 seconds.
> I am going to automatize this step in ansible, which already runs
> xen-create-images
> based on the given hostvars. Unfortunately the domain does not start. I
> get the following error message:
> 
> xl create dzb327.netfed.de.cfg
> Parsing config from dzb327.netfed.de.cfg
> libxl: error: libxl_device.c:1418:libxl__wait_for_backend: Backend
> /local/domain/0/backend/qdisk/0/51712 not ready
> libxl: error: libxl_bootloader.c:417:bootloader_disk_attached_cb: Domain
> 114:failed to attach local disk for bootloader execution
> libxl: error: libxl_bootloader.c:283:bootloader_local_detached_cb:
> Domain 114:unable to detach locally attached disk
> libxl: error: libxl_create.c:1267:domcreate_rebuild_done: Domain
> 114:cannot (re-)build domain: -3
> libxl: error: libxl_domain.c:1034:libxl__destroy_domid: Domain
> 114:Non-existant domain
> libxl: error: libxl_domain.c:993:domain_destroy_callback: Domain
> 114:Unable to destroy guest
> libxl: error: libxl_domain.c:920:domain_destroy_cb: Domain
> 114:Destruction of domain failed
> 
> 
> These are the relevant parts of my dzb327.netfed.de.cfg:
> 
> bootloader = 'pygrub'

What is the guest OS? Also Debian 10? With the 4.19 kernel in Debian 10,
you can use grub2 in combination with PVH.

You need the grub-xen-host package on the dom0, and in the domU you need
the grub-xen package. No actual grub install / boot sector etc is
needed, only the config file (remember, it's PVH, not HVM).

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=776450#95

kernel = "/usr/lib/grub-xen/grub-i386-xen_pvh.bin"
type = "pvh"

> type = 'pvh'
> vcpus       = '2'
> memory      = '4096'
> maxmem      = '4096'
> 
> 
> #
> #  Disk device(s).
> #
> root        = '/dev/xvda2 ro'
> disk        = [
>                  
> 'tap2:qcow2:/home/xen/domains/dzb327.netfed.de/disk.img,xvda2,w
> <http://dzb327.netfed.de/disk.img,xvda2,w>',
>                  
> 'tap2:qcow2:/home/xen/domains/dzb327.netfed.de/swap.img,xvda1,w
> <http://dzb327.netfed.de/swap.img,xvda1,w>',
>               ]
> #

Is there a specific reason you're using xvda1, xvda2 instead of just
xvda, xvdb?

> 
> How do I do this right? I have found dozen of hits for booting xen with
> raw-images converted to qcow2, so it seems I am not trying anthing out
> of the ordinary here.

Hans


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