> -----Original Message----- > From: Andrew Cooper [mailto:andrew.coop...@citrix.com] > Sent: 06 November 2015 18:08 > To: Paul Durrant; xen-de...@lists.xenproject.org > Cc: Keir (Xen.org); Ian Campbell; Tim (Xen.org); Ian Jackson; Jan Beulich > Subject: Re: [Xen-devel] [PATCH 3/4] docs: Document xenstore paths for > domain hotplug features > > On 06/11/15 17:21, Paul Durrant wrote: > > Without some indication from an HVM domain it is not possible for a > > toolstack to know whether instantiation of a new vbd or vif should > > result in a new PV device of the appropriate type being instantiated > > in a guest. (In other words whether PV drivers are present and > > functioning). > > > > This patch document two paths which vif and vbd frontend drivers can > > use to advertise their ability to respond to new vif or vbd > > instantiations. > > > > Signed-off-by: Paul Durrant <paul.durr...@citrix.com> > > Cc: Ian Campbell <ian.campb...@citrix.com> > > Cc: Ian Jackson <ian.jack...@eu.citrix.com> > > Cc: Jan Beulich <jbeul...@suse.com> > > Cc: Keir Fraser <k...@xen.org> > > Cc: Tim Deegan <t...@xen.org> > > --- > > docs/misc/xenstore-paths.markdown | 12 ++++++++++++ > > 1 file changed, 12 insertions(+) > > > > diff --git a/docs/misc/xenstore-paths.markdown b/docs/misc/xenstore- > paths.markdown > > index 7701632..9e98d6f 100644 > > --- a/docs/misc/xenstore-paths.markdown > > +++ b/docs/misc/xenstore-paths.markdown > > @@ -387,6 +387,18 @@ A domain writable path. Available for arbitrary > domain use. > > A domain may write version information for PV driver $NAME using > > this path. > > > > +#### ~/feature/hotplug/vif = ("0"|"1") [w,HVM] > > + > > +An HVM domain can indicate to a toolstack that it is capable > > +of responding to instantiation of a new vif by bringing online a > > +new PV network device without the need for a reboot. > > + > > +#### ~/feature/hotplug/vbd = ("0"|"1") [w,HVM] > > + > > +An HVM domain can indicate to a toolstack that it is capable > > +of responding to instantiation of a new vbd by bringing online a > > +new PV block device without the need for a reboot. > > These flags are not inherently restricted to HVM guests. Therefore, I > would avoid specifying them as such. (It is quite possible for a PV > guest not to be able to hotplug a vbd for example.)
I wasn't sure that was true. My belief was that all pure PV guests would have frontends handling hot attach. I'm happy to drop the HVM tag in v2 though. Paul > > ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
