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

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

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).

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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