Re: [Xen-users] Dom0 Device Driver Access

["Todd Deshane" <deshantm@xxxxxxxxx>]

On Tue, Jun 17, 2008 at 11:15 PM, jim burns <jim_burn@xxxxxxxxxxxxx> wrote:
> On Tuesday June 17 2008 01:00:25 pm Artur Baruchi wrote:
>> Does Dom0 access device driver using Ring Structures (like DomU does)
>> or it has direct access to Device Driver (like Native Linux)?
>
> Yes and no. Things like memory management and paging are done by xen.gz.
> Device access is (usually) done by dom0. xen.gz runs in ring 0; dom0 runs in
> ring 1 (not sure about the domus); and userland runs in ring 3. A quick
> search of xen.org couldn't provide a url to back this up.
>
suggested reading:
Xen and the Art of Virtualization
www.cl.cam.ac.uk/research/srg/netos/papers/2003-xensosp.pdf


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