Re: [Xen-devel] [PATCH for-4.13 2/2] Rationalize max_grant_frames and max_maptrack_frames handling

["Durrant, Paul" <pdurrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Ian Jackson <ian.jackson@xxxxxxxxxx>
> Sent: 27 November 2019 11:10
> To: Durrant, Paul <pdurrant@xxxxxxxxxx>
> Cc: Ian Jackson <Ian.Jackson@xxxxxxxxxx>; George Dunlap
> <George.Dunlap@xxxxxxxxxx>; Juergen Gross <jgross@xxxxxxxx>; Stefano
> Stabellini <sstabellini@xxxxxxxxxx>; Julien Grall <julien@xxxxxxx>; Wei
> Liu <wl@xxxxxxx>; Paul Durrant <paul@xxxxxxx>; Andrew Cooper
> <Andrew.Cooper3@xxxxxxxxxx>; Konrad Rzeszutek Wilk
> <konrad.wilk@xxxxxxxxxx>; Marek Marczykowski-Górecki
> <marmarek@xxxxxxxxxxxxxxxxxxxxxx>; Hans van Kranenburg <hans@xxxxxxxxxxx>;
> Jan Beulich <jbeulich@xxxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] [PATCH for-4.13 2/2] Rationalize max_grant_frames
> and max_maptrack_frames handling
> 
> Durrant, Paul writes ("RE: [Xen-devel] [PATCH for-4.13 2/2] Rationalize
> max_grant_frames and max_maptrack_frames handling"):
> > > -----Original Message-----
> > > From: Xen-devel <xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf Of
> Ian
> > > Jackson
> > > I have seen reports of users who ran out of grant/maptrack frames
> > > because of updates to use multiring protocols etc.  The error messages
> > > are not very good and the recommended workaround has been to increase
> > > the default limit on the hypervisor command line.
> > >
> > > It is important that we don't break that workaround!
> >
> > Alas it has apparently been broken for several releases now :-(
> 
> I guess at least in Debian (where I have seen this) we haven't
> released with any affected versions yet...

I believe the problem was introduce in 4.10, so I think it would be prudent to 
also back-port the final fix to stable trees from then on.

  Paul

> 
> Ian.

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