Re: [Xen-devel] problem about using xl create to start a domU

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

On 2016/5/6 16:51, Julien Grall wrote:
> Hi Shannon,
> 
> On 06/05/16 03:33, Shannon Zhao wrote:
>> Below is the output of xenstore-ls:
>>
>> root@genericarmv8:/home# xenstore-ls -f
>> /tool = ""
>> /tool/xenstored = ""
>> /local = ""
>> /local/domain = ""
>> /local/domain/0 = ""
>> /local/domain/0/domid = "0"
>> /local/domain/0/name = "Domain-0"
>> /vm = ""
>> /libxl = ""
>>
>> "ps -ef" prints:
>>
>> root      1050     1  0 Jul10 ?        00:00:00
>> /usr/local/sbin/xenstored --pid-file /var/run/xenstored.pid
>>
>> root      1135     1  0 Jul10 ?        00:00:00
>> /usr/local/sbin/xenconsoled --pid-file=/var/run/xenconsoled.pid
> 
> This looks good to me. To double check, have you enabled
> CONFIG_BLKDEV_BACKEND?
>
Maybe that's the problem. Just now I tried to use ramdisk instead of
disk. It can create the domU.

kernel = "/home/Image"
ramdisk="/home/guestfs.cpio.gz"
name = "guest"
memory = 512
vcpus = 1
extra = "console=hvc0 root=/dev/ram ro"

And I checked that the CONFIG_XEN_BLKDEV_BACKEND is n. Then I select it.

root@genericarmv8:~# zcat /proc/config.gz | grep BLKDEV
CONFIG_XEN_BLKDEV_FRONTEND=y
CONFIG_XEN_BLKDEV_BACKEND=y

But when I create the domU with disk, it still failed:

root@genericarmv8:/home# xl create domU.cfg
Parsing config from domU.cfg
/etc/xen/scripts/xen-hotplug-common.sh: line 23:
/var/log/xen/xen-hotplug.log: No such file or directory
libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus:
/etc/xen/scripts/block add [1239] exited with error status 1
libxl: error: libxl_create.c:1252:domcreate_launch_dm: unable to add
disk devices
/etc/xen/scripts/xen-hotplug-common.sh: line 23:
/var/log/xen/xen-hotplug.log: No such file or directory
libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus:
/etc/xen/scripts/block remove [1245] exited with error status 1
libxl: error: libxl.c:1564:libxl__destroy_domid: non-existant domain 1
libxl: error: libxl.c:1523:domain_destroy_callback: unable to destroy
guest with domid 1
libxl: error: libxl.c:1452:domain_destroy_cb: destruction of domain 1 failed

root@genericarmv8:/home# cat domU.cfg
kernel = "/home/Image"
name = "guest"
memory = 512
vcpus = 1
extra = "console=hvc0 root=/dev/xvda ro"
disk = [ 'phy:/dev/loop0,xvda,w' ]

Thanks,
-- 
Shannon


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