Hi
How do I reliably determine if the current kernel is
dom0 (xen capable) or not ?
Presence of some file in linux /proc/xen and
solaris /dev/xen/ ?
Any platform independent way ? Some python API ?
Any other ways?
Thanks
/Jd
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Keir Fraser
2007-Jul-11 19:18 UTC
Re: [Xen-devel] determining if kernel is dom0 kernel or not.
If you are looking for running on Xen versus not on Xen (rather than dom0 versus domU), and you are interested in x86 only, then the program in tools/misc/xen-detect.c is along the lines of what you want (and can be cut down to size if you just want e.g., a non-zero return code if running on Xen). If you want to detect dom0 specifically then that''s trickier -- /proc/xen/privcmd for example exists even in a domU, if the kernel is dom0-capable. You''d have to be root and then try a privileged hypercall. :-) -- Keir On 11/7/07 19:40, "jd" <jdsw2002@yahoo.com> wrote:> Hi > How do I reliably determine if the current kernel is > dom0 (xen capable) or not ? > > Presence of some file in linux /proc/xen and > solaris /dev/xen/ ? > > Any platform independent way ? Some python API ? > Any other ways? > > Thanks > /Jd > > > > ______________________________________________________________________________ > ______ > Yahoo! oneSearch: Finally, mobile search > that gives answers, not web links. > http://mobile.yahoo.com/mobileweb/onesearch?refer=1ONXIC > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Ian Campbell
2007-Jul-11 20:38 UTC
Re: [Xen-devel] determining if kernel is dom0 kernel or not.
On Wed, 2007-07-11 at 20:18 +0100, Keir Fraser wrote:> If you want to detect dom0 specifically then that''s trickier -- > /proc/xen/privcmd for example exists even in a domU, if the kernel is > dom0-capable. You''d have to be root and then try a privileged hypercall. :-)Doesn''t /proc/xen/capabilities contain something different on dom0 vs. domU? _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Keir Fraser
2007-Jul-11 21:39 UTC
Re: [Xen-devel] determining if kernel is dom0 kernel or not.
On 11/7/07 21:38, "Ian Campbell" <Ian.Campbell@XenSource.com> wrote:> On Wed, 2007-07-11 at 20:18 +0100, Keir Fraser wrote: >> If you want to detect dom0 specifically then that''s trickier -- >> /proc/xen/privcmd for example exists even in a domU, if the kernel is >> dom0-capable. You''d have to be root and then try a privileged hypercall. :-) > > Doesn''t /proc/xen/capabilities contain something different on dom0 vs. > domU?Oh yes, of course. It contains ''control_d'' if you are dom0. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Cool. This is what I was looking for. Optional : Any history behind it containing ''control_d'' ? Control Dom ? Thanks /Jd --- Keir Fraser <keir@xensource.com> wrote:> On 11/7/07 21:38, "Ian Campbell" > <Ian.Campbell@XenSource.com> wrote: > > > On Wed, 2007-07-11 at 20:18 +0100, Keir Fraser > wrote: > >> If you want to detect dom0 specifically then > that''s trickier -- > >> /proc/xen/privcmd for example exists even in a > domU, if the kernel is > >> dom0-capable. You''d have to be root and then try > a privileged hypercall. :-) > > > > Doesn''t /proc/xen/capabilities contain something > different on dom0 vs. > > domU? > > Oh yes, of course. It contains ''control_d'' if you > are dom0. > > -- Keir > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel >____________________________________________________________________________________ Fussy? Opinionated? Impossible to please? Perfect. Join Yahoo!''s user panel and lay it on us. http://surveylink.yahoo.com/gmrs/yahoo_panel_invite.asp?a=7 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Mark Williamson
2007-Jul-12 13:35 UTC
Re: [Xen-devel] determining if kernel is dom0 kernel or not.
> Optional : > Any history behind it containing ''control_d'' ? > Control Dom ?Yeah, I should think that''s what it stands for ;-) Dom0''s kernel knows if it''s dom0, anyhow - it has to know it''s supposed to manage various privileged stuff. The /proc/xen/capabilities interface is just a convenient way of it telling userspace (was introduced, IIRC, for purposes such as making init scripts do the Right Thing withoout breaking in all cases, rather than having to be manually set up differently for native / dom0 / domU). Cheers. Mark> Thanks > /Jd > > --- Keir Fraser <keir@xensource.com> wrote: > > On 11/7/07 21:38, "Ian Campbell" > > > > <Ian.Campbell@XenSource.com> wrote: > > > On Wed, 2007-07-11 at 20:18 +0100, Keir Fraser > > > > wrote: > > >> If you want to detect dom0 specifically then > > > > that''s trickier -- > > > > >> /proc/xen/privcmd for example exists even in a > > > > domU, if the kernel is > > > > >> dom0-capable. You''d have to be root and then try > > > > a privileged hypercall. :-) > > > > > Doesn''t /proc/xen/capabilities contain something > > > > different on dom0 vs. > > > > > domU? > > > > Oh yes, of course. It contains ''control_d'' if you > > are dom0. > > > > -- Keir > > > > > > _______________________________________________ > > Xen-devel mailing list > > Xen-devel@lists.xensource.com > > http://lists.xensource.com/xen-devel > > > ___________________________________________________________________________ >_________ Fussy? Opinionated? Impossible to please? Perfect. Join Yahoo!''s > user panel and lay it on us. > http://surveylink.yahoo.com/gmrs/yahoo_panel_invite.asp?a=7 > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel-- Dave: Just a question. What use is a unicyle with no seat? And no pedals! Mark: To answer a question with a question: What use is a skateboard? Dave: Skateboards have wheels. Mark: My wheel has a wheel! _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel