Re: [Xen-ia64-devel][PATCH] Enable SMP on VTI domain.

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

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@xxxxxxxxxxxxxxxxxxx
> >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:Tristan.Gingold@xxxxxxxx]
> >
> >[...]
> >
> >> >> 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.

Tristan.

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