Re: Problem creating domU guest on arm64

[Wei Chen <Wei.Chen@arm.com>]

Hi Marco,

On 2022/4/15 18:56, Marco Cacre wrote:
> 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, 

Have you tried to remove cdrom from your DomU config? I am not sure
cdrom can work well for Arm without device model.

Cheers,
Wei Chen
> 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