Re: [Xen-ia64-devel] alt_itlb_miss?

[Alex Williamson <alex.williamson@xxxxxx>]

On Wed, 2006-04-19 at 11:50 +0900, Isaku Yamahata wrote:
> On Wed, Apr 19, 2006 at 09:05:49AM +0800, Tian, Kevin wrote:
> > 
> > So the logic to support identity mapped ITC insertion should be 
> > added to itlb_miss handler, however the interesting thing is why 
> > you encounter it in alt_itlb_miss handler. As above debug output, 
> > the rr7 is also configured with vhpt table enabled...
> 
> PSR.dt = 0 or PSR.ic = 0?
> If so, the assumption that alt_itlb_miss handler dosn't occur is incorrect.

   I traced through one more time.  Looks like I missed the initial
entry into the IVT.  I'm taking an itlb_miss, then branching to the
alt_itlb_miss in VHPT_CCHAIN_LOOKUP.  PSR.dt = PSR.ic = 1.  Hopefully
that clarifies how we're getting into alt_itlb_miss in a vhpt covered
region.  AFAICT, the logic exists in alt_itlb_miss to fill the itc for
this, but it's disable by the FORCE_CRASH.  Thanks,

        Alex

-- 
Alex Williamson                             HP Linux & Open Source Lab


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