Re: [Xen-devel] [PATCH v5 2/5] libxl: add query function for backend support by device model

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Mar 30, 2016 at 04:11:39PM +0200, Juergen Gross wrote:
> On 30/03/16 16:09, Wei Liu wrote:
> > On Wed, Mar 30, 2016 at 04:02:20PM +0200, Juergen Gross wrote:
> >> On 30/03/16 15:53, Wei Liu wrote:
> >>> On Wed, Mar 30, 2016 at 02:05:55PM +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@xxxxxxxx>
> >>>
> >>> The code itself looks straightforward enough.
> >>>
> >>> But note that this is a new protocol that needs to be supported
> >>> essentially forever. I've CC QEMU maintainers for their input.
> >>
> >> Okay, I'll send the qemu patch now.
> >>
> > 
> > And also a patch to docs/misc/xenstore-paths.markdown please.
> 
> Aah, sure.
> 

Actually wait, I think all QEMU nodes are either under documented or I
looked at the wrong place.

Anthony, how should we document the protocol between QEMU and toolstack?
Did I look at the wrong place?

Wei.

> 
> Juergen
> 

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