Re: [Xen-devel] Permission for xenstore operation on HVM

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Sun, 18 Sep 2011, duolvxendev wrote:
> Hi, I'm trying to write some message using xenbus_printf to xenstore from a
> debian HVM guest with pv-on-HVM driver. I got a permission denied error
> return code. How should I do if I want write the message to xenstore in
> kernel module?
> 
> PS: the hypervisor is xen-3.4.2; the dom0 is CentOS 5.4 and the guest is
> Debian 6; the pv-on-HVM driver is built from Alex Bligh's patch and it works
> well. 

Where are you trying to write to?
Most locations, other than /local/domain/$DOMID and subpaths, cannot be
written by unprivileged guests.

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