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RE: [Xen-devel] [BUNDLE] Testing a simpler inter-domain transport

To: "Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>
Subject: RE: [Xen-devel] [BUNDLE] Testing a simpler inter-domain transport
From: Hollis Blanchard <hollisb@xxxxxxxxxx>
Date: Wed, 08 Feb 2006 13:55:47 +1100
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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On Tue, 2006-02-07 at 17:31 -0800, Magenheimer, Dan (HP Labs Fort
Collins) wrote:
> On ia64 and I believe also on PPC, a guest can translate
> from virtual to (pseudo)physical but only on x86 can
> a guest translate from virtual to machine -- at least
> without an extra hypercall.  On all three,
> Xen can translate from (pseudo)physical to machine but
> only on x86 can Xen translate from virtual to
> (pseudo)physical. 


> So it seems to me that if you "prefer to keep all archs the
> same", the proper way to pass the parameters are as
> (pseudo)physical addresses: the guest translates the
> virtual address to a (pseudo)physical address and
> Xen translates from the (pseudo)physical address to
> the machine address and everybody is happy.


Hollis Blanchard
IBM Linux Technology Center

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