Re: [Xen-devel] Unable to add disk on ARM64

[Peng Fan <van.freenix@xxxxxxxxx>]

On Fri, Aug 12, 2016 at 04:57:06PM +0200, Roger Pau Monné wrote:
>On Fri, Aug 12, 2016 at 03:00:34PM +0200, Julien Grall wrote:
>> On 12/08/2016 14:24, Peng Fan wrote:
>> > Hi,
>> 
>> Hello Peng,
>> 
>> I have CCed Roger who is more familiar than me with the hotplug scripts.
>> 
>> > I am using xen master branch on i.MX8 ARM64.
>> > 
>> > My xl configuration:
>> > 
>> > kernel = "/root/xen/Image"
>> > memory = "128"
>> > name = "DomU"
>> > vcpus = 1
>> > serial="pty"
>> > disk = [ 'phy:/dev/loop0,xvda,w' ]
>> > extra = "console=hvc0 root=/dev/xvda debug=/bin/sh"
>> > 
>> > 
>> > And I "losetup /dev/loop0 /root/DomU-rootfs" in Dom0 Linux.
>> > 
>> > But I met the following error:
>> > libxl: debug: libxl_aoutils.c:593:libxl__async_exec_start: forking to 
>> > execute: /etc/xen/scripts/block add ^M^M
>> > Device /dev/loop0 is mounted in the privileged domain,^M^M
>> > and so cannot be mounted by a guest.^M^M
>> > libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus: 
>> > /etc/xen/scripts/block add [800] exited with error status 1^M^M
>> > libxl: debug: libxl_event.c:686:libxl__ev_xswatch_deregister: watch 
>> > w=0xfee100: deregister unregistered^M^M
>> > libxl: error: libxl_devi
>> > ce.c:1202:device_hotplug_child_death_cb: script: Device /dev/loop0 is 
>> > mounted in the privileged domain,^M^M
>> > and so cannot be mounted by a guest.^M^M
>> 
>> From my understanding, you have mounted /dev/loop0 in Dom0, is that correct?
>> However, we don't support sharing the same mounting point by default (Roger
>> can you confirm).

Fixed. In tiny rootfs, there is no `stat`. I recompiled busybox with more 
applets,
and all is ok now.

Regards,
Peng.

>
>It seems like the hotplug script has detected that you have the device 
>already attached to Dom0, can you paste the output of `xenstore-ls -fp` 
>when this happens?
> 
>It could be that there's some garbage in xenstore from a device that hasn't 
>been properly detached.
>
>Roger.

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