Problem creating domU guest on arm64

[Marco Cacre <marco.cacre@gmail.com>]

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Hi all,

I'm facing always the same problem (described below) trying to create a Xen
guest domain on rockpro64 (arm64).

I have successfully built uboot, xen (4.14.4) and dom0 linux kernel with
xen tool stack, these two last starting from buildroot (with linux kernel
version 5.15.33 and xen toolstack version 4.14.4)

These are the process of Xen:

177 root    /usr/sbin/xenwatchdogd 30 15
203 root    /usr/sbin/xenstored --pid-file /var/run/xen/xenstored.pid
208 root    /usr/sbin/xenconsoled --pid-file=/var/run/xen/xenconsoled.pid
214 root    /usr/lib/xen/bin/qemu-system-i386 -xen-domid 0 -xen-attach
-name dom0 -nographic -M xenpv -daemonize -monitor /dev/null
-serial/dev/nul -parallel/dev/null -pidfile/var/run/xen/qemu-dom0.pid

and the drivers loaded as a module:
# lsmod
Module                  Size  Used by    Tainted: G
xen_netback            65536  0
xen_blkback            49152  0

Xen and dom0 Image boot up successfully, at the end:
================================================
>xl list
Name                                        ID  Mem VCPUs State Time(s)
Domain-0                                    0  1024    2    r-----    4000.3

# uname -a
Linux rockpro64 5.15.33 #3 SMP PREEMPT Fri Apr 15 11:01:37 CEST 2022
aarch64 GNU/Linux
================================================

when I try to create a domU domain I have problem with disk backend, I have
made several attempts trying with different domU linux and I always get the
following error :

================================================
Parsing config from ./alpine_xen_domu.config

libxl: error: libxl_aoutils.c:539:async_exec_timeout: killing execution of
/etc/xen/scripts/block add because of timeout
libxl: error: libxl_create.c:1608:domcreate_launch_dm: Domain 2:unable to
add disk devices
libxl: error: libxl_aoutils.c:539:async_exec_timeout: killing execution of
/etc/xen/scripts/block remove because of timeout
libxl: error: libxl_domain.c:1182:libxl__destroy_domid: Domain
2:Non-existant domain
libxl: error: libxl_domain.c:1136:domain_destroy_callback: Domain 2:Unable
to destroy guest
libxl: error: libxl_domain.c:1063:domain_destroy_cb: Domain 2:Destruction
of domain failed
================================================

The last try was with alpine domU linux with the following config:
================================================

# Alpine Linux PV DomU
# Kernel paths for install
kernel = "/home/xen/vmlinuz-virt"
ramdisk = "/home/xen/initramfs-virt"
extra="modules=loop,squashfs console=hvc0"
# Path to HDD and iso file
disk = [ 'format=raw, vdev=xvda, access=w, target=/data/a1.img',
        'format=raw, vdev=xvdc, access=r, devtype=cdrom,
target=/home/xen/alpine-virt-3.15.3-armv7.iso'  ]
# Network configuration
vif = ['bridge=br0']
# DomU settings

memory = 512

name = "alpine-a1"

vcpus = 1

maxvcpus = 1
================================================

thanks a lot in advance
Best regards
Marco

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