Re: [PATCH v6 3/6] libxl: add query function for backend support by device model

[Wei Liu <wei.liu2@citrix.com>]

Actually CC Anthony

On Thu, Mar 31, 2016 at 03:33:59PM +0100, Wei Liu wrote:
> On Thu, Mar 31, 2016 at 07:49:03AM +0200, Juergen Gross wrote:
> > Add a function to query whether the device model is supporting a
> > specific backend type. The device model is writing the supported
> > backend types to Xenstore on startup. The new query function checks
> > for the appropriate entry to be present.
> > 
> > As not all versions of qemu are capable to indicate support of
> > specific backends the query function is to be called with an indicator
> > whether the default return value should be "supported" (in case qemu
> > doesn't know set any support information) or "not supported".
> > 
> > Signed-off-by: Juergen Gross <jgross@suse.com>
> > ---
> > V6: add Xenstore path documentation as requested by Wei Liu
> > ---
> >  docs/misc/xenstore-paths.markdown |  7 +++++++
> >  tools/libxl/libxl_dm.c            | 19 +++++++++++++++++++
> >  tools/libxl/libxl_internal.h      |  5 +++++
> >  3 files changed, 31 insertions(+)
> > 
> > diff --git a/docs/misc/xenstore-paths.markdown b/docs/misc/xenstore-paths.markdown
> > index 76f67b1..890d261 100644
> > --- a/docs/misc/xenstore-paths.markdown
> > +++ b/docs/misc/xenstore-paths.markdown
> > @@ -472,6 +472,13 @@ in the value supplied by the guest in this case).
> >  
> >  Contains the status of the device models running on the domain.
> >  
> > +#### ~/device-model/$DOMID/backends/* [w]
> > +
> > +Backend types the device model is supporting. Each entry below backends
> > +is a directory which may contain further nodes specific to the backend
> > +type. The name of each backend directory is the same as the backend type
> > +(e.g. "qdisk").
> > +
> 
> Anthony, can you ack / nack this?
> 
> The rest of code looks OK.
> 
> Wei.

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