Le Mercredi 31 Mai 2006 15:02, Xu, Anthony a écrit : > From: Tristan Gingold [mailto:[EMAIL PROTECTED] > > >Sent: 2006年5月31日 20:54 > >To: Xu, Anthony; xen-ia64-devel@lists.xensource.com > >Subject: Re: [Xen-ia64-devel][PATCH] Enable SMP on VTI domain. > > > >Le Mercredi 31 Mai 2006 14:25, Xu, Anthony a écrit : > >> From: Tristan Gingold [mailto:[EMAIL PROTECTED] > >> > >> >Sent: 2006年5月31日 20:19 > >> >To: Xu, Anthony; xen-ia64-devel@lists.xensource.com > >> >Subject: Re: [Xen-ia64-devel][PATCH] Enable SMP on VTI domain. > >> > > >> >Le Mercredi 31 Mai 2006 14:04, Xu, Anthony a écrit : > >> >> From: Tristan Gingold > >> >> > >> >> >Sent: 2006年5月31日 20:04 > >> >> >To: Xu, Anthony; xen-ia64-devel@lists.xensource.com > >> >> >Subject: Re: [Xen-ia64-devel][PATCH] Enable SMP on VTI domain. > >> >> > > >> >> >Le Mercredi 31 Mai 2006 13:43, Xu, Anthony a écrit : > >> >> >> From: Tristan Gingold [mailto:[EMAIL PROTECTED] > >> >> > > >> >> >[...] > >> >> > > >> >> >> >> Another concern is, > >> >> >> >> If SMP guest is running on a UP platform, vcpus may have same > >> >> >> >> vcpuid. > >> >> >> > > >> >> >> >Why ? IMHO this can never happen. > >> >> >> > >> >> >> There are 4 LP on my box, if I want to boot a domU with 6 vcpus, > >> >> >> Can this domU boot? > >> >> > > >> >> >[ I have never tried, but here is my understanding:] > >> >> >Sure. You can create more vcpus than existing cpus. Of course, you > >> >> > can't run 6 vcpus simultaneously on 4 cpus! > >> >> > >> >> If the lid of vcpus is extracted from machine lid, there are at least > >> >> two vcpus whose lids are same, which may make guest OS confused. > >> > > >> >lid are paravirtualized except for dom0 (currently, this has to be > >> > revisited). > >> > > >> >I think there is a misunderstanding somewhere, because some questions > >> > sound too strange. > >> > > >> >My (small) comment was simple: > >> >On Xen/VTI, GFW set lid and Xen has to build a map from lid to vcpuid. > >> >I just think it should be simpler to modify GFW so that lid = vcpuid. > >> > >> That is exactly what I implemented. > > > >I may have mis-read the patches you have recently posted but on the > > current changeset lid_to_vcpu is O(n). Why isn't it O(1) ? > > Sorry, don’t catch you. > In lid register, id is from 24 to 31, eid is from 16 to 23. > So lid = vcpuid << 24 OK.
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