The following reply was made to PR port-xen/29999; it has been noted by GNATS.

From: Manuel Bouyer <bouyer@antioche.lip6.fr>
To: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Cc: YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>, gnats-bugs@NetBSD.org,
	port-xen-maintainer@NetBSD.org, gnats-admin@NetBSD.org,
	netbsd-bugs@NetBSD.org
Subject: Re: port-xen/29999: ctrl_if_interrupt IPL problem
Date: Tue, 19 Apr 2005 12:51:17 +0200

 On Tue, Apr 19, 2005 at 11:43:04AM +0100, Christian Limpach wrote:
 > From: "Manuel Bouyer" <bouyer@antioche.lip6.fr>
 > >Hum, I need to look at this again. From what I remember, if I leaved
 > >the events blocked, HYPERVISOR_yield() would never return.
 > >But maybe I had something else wrong in my code.
 > 
 > HYPERVISOR_yield() should be used to yield the cpu, i.e. other domains will 
 > get to run and the current domain gets put on the runqueue and will run 
 > again at some point.  HYPERVISOR_block() will also yield the cpu but only 
 > returns once there's an event that can be delivered.
 
 Will HYPERVISOR_block() return when there is an event pending, even if
 evtchn_upcall_mask is nonzero ?
 
 --
 Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
      NetBSD: 26 ans d'experience feront toujours la difference
 --