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Re: [Xen-devel] Mini-OS and Xen!

To: "Jayaraman, Bhaskar" <Bhaskar.Jayaraman@xxxxxxx>
Subject: Re: [Xen-devel] Mini-OS and Xen!
From: Daniel Stodden <stodden@xxxxxxxxxx>
Date: Mon, 04 Aug 2008 23:23:44 -0700
Cc: Xen Developers <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On Tue, 2008-08-05 at 14:01 +0800, Jayaraman, Bhaskar wrote:
> Hi I have a doubt regarding Mini-OS and Xen. If it is true that Xen
> reserves in the virtual address space the top 64MB on 32bit systems
> and 168MB in PAE systems, doesn’t it exist with a Mini-OS kernel which
> has only 32MB in size i.e. going by its default config file? Obviously
> I’m missing something.

Virtual address space size is always a full 32bit or 64bit,
respectively. That's not yet memory, but mere address space.

Parts of which are mapped to a hypervisor and a guest system,
respectively. Now it's memory.

Therein, guest system size does not include hypervisor size.


Daniel Stodden
LRR     -      Lehrstuhl für Rechnertechnik und Rechnerorganisation
Institut für Informatik der TU München             D-85748 Garching
http://www.lrr.in.tum.de/~stodden         mailto:stodden@xxxxxxxxxx
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