Bruce Granger
2012-Sep-21 03:23 UTC
How could Xen know a certain GuestOS have already shutdown?
Hi everyone!This is probably a familiar problem, but I haven''t found anything in the archives or from google yet. I also talked with my parterners but we haven''t got a sure conclusion.Recently I’m caring about a question about shutdown operation: When we shutdown a GuestOS by giving the command in its terminal, how can hypervisor get to know that this GuestOS is about to shutdown and How can hypervisor know that GuestOS has already done the work of shutdown? In other word, is there any signal or something else that GuestOS deliver to hypervisor to notice that it will shutdown or it has accomplished its shutdown work? Does anyone know the detailed process?Thanks for your help! -- View this message in context: http://xen.1045712.n5.nabble.com/How-could-Xen-know-a-certain-GuestOS-have-already-shutdown-tp5711421.html Sent from the Xen - Dev mailing list archive at Nabble.com. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Keir Fraser
2012-Sep-21 08:06 UTC
Re: How could Xen know a certain GuestOS have already shutdown?
When the guest shuts down, Xen sends VIRQ_DOM0_EXC to dom0. This is picked up by xenstored which fires the @releaseDomain watch. Anyone in dom0 can register on that watch. Or see libxl__domaindeathcheck_* functions in libxl/libxl_event.c for another method to pick up on domain shutdowns. -- Keir On 21/09/2012 04:23, "Bruce Granger" <vivagin@yeah.net> wrote:> Hi everyone! This is probably a familiar problem, but I haven''t found anything > in the archives or from google yet. I also talked with my parterners but we > haven''t got a sure conclusion. Recently I¹m caring about a question about > shutdown operation: When we shutdown a GuestOS by giving the command in its > terminal, how can hypervisor get to know that this GuestOS is about to > shutdown and How can hypervisor know that GuestOS has already done the work of > shutdown? In other word, is there any signal or something else that GuestOS > deliver to hypervisor to notice that it will shutdown or it has accomplished > its shutdown work? Does anyone know the detailed process? Thanks for your > help! > > View this message in context: How could Xen know a certain GuestOS have > already shutdown? > <http://xen.1045712.n5.nabble.com/How-could-Xen-know-a-certain-GuestOS-have-al > ready-shutdown-tp5711421.html> Sent from the Xen - Dev mailing list archive > <http://xen.1045712.n5.nabble.com/Xen-Dev-f2473738.html> at Nabble.com. > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xen.org > http://lists.xen.org/xen-devel_______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Bruce Granger
2012-Sep-24 13:12 UTC
Re: How could Xen know a certain GuestOS have already shutdown?
It''s my honor to receive your answer! Thanks very much! I have learned much more under your guidance,but I still have a little question! I''ve traced the VIRQ_DOM_EXC which send from Xen to Dom0 and picked up by xenstored which fires the @releaseDomain watch when a GuestOS start to shutdown. Here, I still have two questions. First, I haven''t found anything useful in the archives about ''releaseDomain watch''.What is the called ''@releaseDomain'' ? what''s the use of it? Second,I think that VIRQ_DOM_EXC is the signal used for communicate between hypervisor and Dom0. I talked that with my parterner, we think that when shutdown occurs, GuestOS will first get in touch with hypervisor ,then cause the communication between Xen and Dom0 by VIRQ_DOM_EXC,is that right? What we also want to know is when shutdown operation occurs in GuestOS, how GuestOS communicate with the hypervisor first? Is there any signal or somehow event delivery? Could you tell me more about that? Thanks a lot! -- View this message in context: http://xen.1045712.n5.nabble.com/Xen-devel-How-could-Xen-know-a-certain-GuestOS-have-already-shutdown-tp5711421p5711476.html Sent from the Xen - Dev mailing list archive at Nabble.com.
Bruce Granger
2012-Sep-24 17:09 UTC
Re: How could Xen know a certain GuestOS have already shutdown?
Hi everyone! This is probably a familiar problem, but I haven't found anything in the archives or from google yet. I also talked with my parterners but we haven't got a sure conclusion. Recently I’m caring about a question about shutdown operation: When we shutdown a GuestOS by giving the command in its terminal, how can hypervisor get to know that this GuestOS is about to shutdown and How can hypervisor know that GuestOS has already done the work of shutdown? I've traced the VIRQ_DOM_EXC which send from Xen to Dom0 and picked up by xenstored which fires the @releaseDomain watch when a GuestOS start to shutdown. Here, I still have two questions. First, I haven't found anything useful in the archives about 'releaseDomain watch'.What is the called '@releaseDomain' ? what's the use of it? Second,I think that VIRQ_DOM_EXC is the signal used for communicate between hypervisor and Dom0. I talked that with my parterner, we think that when shutdown occurs, GuestOS will first get in touch with hypervisor ,then cause the communication between Xen and Dom0 by VIRQ_DOM_EXC,is that right? What we also want to know is when shutdown operation occurs in GuestOS, how GuestOS communicate with the hypervisor first? Is there any signal or somehow event delivery? Could anyone tell me more about that? It's my honor to get all your support! Thanks very much! -- View this message in context: http://xen.1045712.n5.nabble.com/Re-Xen-devel-How-could-Xen-know-a-certain-GuestOS-have-already-shutdown-tp5711480.html Sent from the Xen - Dev mailing list archive at Nabble.com. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
Ian Campbell
2012-Sep-25 08:22 UTC
Re: How could Xen know a certain GuestOS have already shutdown?
On Mon, 2012-09-24 at 18:09 +0100, Bruce Granger wrote:> Hi everyone! This is probably a familiar problem, > but I haven't found anything in the archives or from google yet. > I also talked with my parterners but we haven't got a sure conclusion. > Recently I’m caring about a question about shutdown operation: When we > shutdown a GuestOS by giving the command in its terminal, how can hypervisor > get to know that this GuestOS is about to shutdown and How can hypervisor > know that GuestOS has already done the work of shutdown? > > I've traced the VIRQ_DOM_EXC which send from Xen to Dom0 and picked up by > xenstored which fires the @releaseDomain watch when a GuestOS start to > shutdown. > > Here, I still have two questions. > First, I haven't found anything useful in the archives about 'releaseDomain > watch'.What is the called '@releaseDomain' ? what's the use of it?Have you grepped in the actual code?> Second,I think that VIRQ_DOM_EXC is the signal used for communicate between > hypervisor and Dom0. I talked that with my parterner, we think that when > shutdown occurs, GuestOS will first get in touch with hypervisor ,then cause > the communication between Xen and Dom0 by VIRQ_DOM_EXC,is that right? What > we also want to know is when shutdown operation occurs in GuestOS, how > GuestOS communicate with the hypervisor first? Is there any signal or > somehow event delivery?I covered this in my reply to you on Friday See Message-ID: <1348214879.26501.68.camel@zakaz.uk.xensource.com> Ian. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel