Re: [Xen-ia64-devel] RE: PATCH: get rid of dcr bit 63 trick

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Vendredi 12 Mai 2006 18:14, Magenheimer, Dan (HP Labs Fort Collins) a écrit 
:
> You *really* don't like that dcr bit 63 test, do you? :-)
Yes I don't :-)  Because it doesn't conformto ASDM.

> One disadvantage of your "cpl!=0" test is that it
> gives the "wrong" answer for a fully-virtualized
> domain.  Arun Sharma (before he left Intel) was looking
> at ways of combining paravirtualization performance
> into a fully-virtualized domain.
>
> Also, per the last time this was discussed, I think there
> are plans in future Itaniums to architect the
> discovery of a virtualization layer, which will
> undoubtedly be different than both the dcr-bit-63 and
> cpl!=0 method, so we will just have to change it again
> in the future.
You have good argument for the future.
For the present, I prefer testing cpl (or ar.rsc) which is correct and will be 
work ad vitam eternam.

This is a very localized issue and can be easily changed.  A definitive 
solution may be checking SAL oem_id.

Tristan.

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