RE: [Xen-ia64-devel] RE: PATCH: PAL_VM_SUMMARY and PAL_VM_INFO

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

I agree completely.  The right answer is for non-VTI Xen/ia64
to eventually support PKRs.  So this is just a discussion
about what to report now from PAL.  Reporting 16 is a lie
and reporting 0 is architecturally incorrect.

I suppose the the answer (0 or 16) is unlikely to matter
anytime soon so I withdraw that objection to Tristan's patch.

Dan

> Wondering if there will be yet another OS got 
> para-virtualized to run on
> Xen/IPF.   Though supporting para-virtualized OS, we should 
> continue to
> maintain a "complete" and "minimal" architectural instead of creating
> yet another legacy architecture.  Or a new driver in XenLinux to take
> advantage of this pkrs.
> 
> 16pkrs would be necessary for architectural completeness.
> 
> -Fred
> 
> -----Original Message-----
> From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> Magenheimer, Dan (HP Labs Fort Collins)
> Sent: Thursday, April 06, 2006 1:26 PM
> To: Williamson, Alex (Linux Kernel Dev)
> Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx; Tristan Gingold
> Subject: [Xen-ia64-devel] RE: PATCH: PAL_VM_SUMMARY and PAL_VM_INFO
> 
> > From: Williamson, Alex (Linux Kernel Dev) 
> > Sent: Thursday, April 06, 2006 2:06 PM
> > To: Magenheimer, Dan (HP Labs Fort Collins)
> > Cc: Tristan Gingold; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: RE: PATCH: PAL_VM_SUMMARY and PAL_VM_INFO
> > 
> > On Thu, 2006-04-06 at 09:30 -0700, Magenheimer, Dan (HP Labs Fort
> > Collins) wrote:
> > 
> > > max_pkr should probably be zero for now (at least non-VT) since
> > > pkr's are not implemented.  Or would this be an "illegal" value
> > > because of architectural definition.
> > 
> >   Looks like that could be considered illegal, the SDM says 
> > there are at
> > least 16 PKRs.
> 
> Given that PKRs are currently unimplemented, returning
> an illegal value (0) might be the right thing anyway.
> 
> Dan
> 
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