Re: [Xen-ia64-devel] domU stability

[Matt Chapman <matthewc@xxxxxxxxxxxxxxx>]

On Tue, Nov 15, 2005 at 06:50:20AM -0800, Magenheimer, Dan (HP Labs Fort 
Collins) wrote:
> > >From: Tristan Gingold
> > >
> > >I am trying xen-ia64-unstable.hg using changeset 7729.  Dom0 
> > works well.
> > >However, domU seems pretty unstable: I got a lot of bad mpa:
> > >However, I was able to log on domU (after many tries).
> > >Has any of you the same errors or is it ok ?
> > 
> > Hi, Tristan,
> >     That warning is harmless, and currently the grant table 
> > pfn is hard code at 0x10000000000 in guest physical, which is 
> > out of normal guest memory range. When be/fe driver 
> > communicates, grant table entries are touched and then you 
> > saw above warnings.
> 
> They do not seem to cause any problems but
> I'm not entirely sure they are harmless.  I think these addresses
> are domU grant table entries that should be translated to
> virtual addresses and shouldn't find their way to
> translate_domain_pte.
> 
> Matt, can you comment?

Yes, as Kevin explains, this is how it's meant to work - the
grant table is currently mapped into guest physical space at
that address, above the top of normal guest physical memory.

Even if the guest kernel access it through a virtual mapping,
the translation process still goes through translate_domain_pte
and hence results in that warning (which should be harmless).

Matt


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