Doesn't a domU virtual address e000010000000009 indicate the 9th entry
in the grant table? Or am I remembering an old design that wasn't
implemented? Or if this is correct, where does this translation
get done? Is it just a normal metaphysical->physical translation in the
3-level lookup table?
Thanks,
Dan
> -----Original Message-----
> From: Matt Chapman [mailto:matthewc@xxxxxxxxxxxxxxx]
> Sent: Tuesday, November 15, 2005 10:07 PM
> To: Magenheimer, Dan (HP Labs Fort Collins)
> Cc: Tian, Kevin; Tristan Gingold; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-ia64-devel] domU stability
>
> 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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