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Re: [Xen-ia64-devel] domU address space

To: "Dong, Eddie" <eddie.dong@xxxxxxxxx>
Subject: Re: [Xen-ia64-devel] domU address space
From: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
Date: Thu, 24 Jan 2008 11:29:11 +0900
Cc: xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
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On Thu, Jan 24, 2008 at 09:28:39AM +0800, Dong, Eddie wrote:
> Alex & All:
>       First of all, pls forgive me that I was out of Xen/IA64 for quit
> a long time, and I didn't fully catch up yet now.
>       In the very beginning day of Xen/IA64, I remembered the address
> isolation between guest (domU) & hypervisor is not solved though guest
> PAL can provide less number of VA bits, it just assume pv guest won't
> touch hypervisor address space, i.e. it will strictly follow PAL
> reported VA address bits. Is this solved now?

Yes. (Possibly there might be bugs, though.)
In paravirtualized domain case, PV domain is running under
ring 2 (or ring 1 depending on the compile time configuration), and
the xen area is proteceted by privileged level.
In VTi domain case, it's protected by psr.vm = 1.


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