On Wed, May 16, 2012 at 10:06:25AM +0200, Paolo Bonzini wrote: > Il 15/05/2012 23:00, Michael S. Tsirkin ha scritto: > > On Tue, May 15, 2012 at 04:26:39PM +0100, Anthony PERARD wrote: > >> In the context of PV-on-HVM under Xen, the emulated nics are supposed to be > >> unplug before the guest drivers are initialized. This mean that there must > >> be > >> unplug without the consent of the guest. > >> > >> Without this patch, the guest end up with two nics with the same MAC, the > >> emulated nic and the PV nic. > >> > >> Signed-off-by: Anthony PERARD <anthony.per...@citrix.com> > > > > OK, so on Xen there are special devices that can be safely removed > > without telling the guest? Does there need to be regular hotplug for > > these devices too? Or can it be always surprise removal? > > On Xen the PV drivers can ask the firmware to surprise-remove the > emulated NICs.
So driver tells firmware (meaning acpi? how?) that it's ok to do surprize removal? > Of course it has to do it early enough so that the guest > doesn't crash. > > Paolo What does early enough mean and how do we ensure that? -- MST
