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

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

>From: Tristan Gingold [mailto:Tristan.Gingold@xxxxxxxx]
>Sent: 2006年5月31日 20:54
>To: Xu, Anthony; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>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:Tristan.Gingold@xxxxxxxx]
>>
>> >Sent: 2006年5月31日 20:19
>> >To: Xu, Anthony; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>> >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@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.
>>
>> 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

>
>Tristan.

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