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RE: [Xen-devel] simultaneous domains on startup

To: "Deepak Manohar" <mjdeepak@xxxxxxxxx>, <Xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] simultaneous domains on startup
From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date: Sat, 11 Jun 2005 13:41:22 +0800
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Thread-topic: [Xen-devel] simultaneous domains on startup
>-----Original Message-----
>From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
>[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Deepak
>Sent: Saturday, June 11, 2005 12:09 AM
>Hi all,
> In xen-3.0-devel is construct_dom0 in xen/arch/x86/domain_build.c the
>function that starts up domain0?
> Would it be possible to call this function again -- to startup
>another doman, provided the two domains do not share any resources?
> Is there anyway to start two domains simultaneously from the
>hypervisor and not using xend?  what would be the work involved to do

You can, but not sure the necessity. :) The steps to construct domain 0
and other domains are completely different. Domain 0 is privileged one
with knowledge about physical resources, which has to be constructed by
XEN. However all resources of other domains are virtualized, including
memory size, address hierarchy, devices, etc. The policy of how other
domains are constructed is left for system administrator in Domain 0 to
decide and configure. Current control panel is such perfect example.
We'd better not introduce that complexity into xen.

Simply saying the possibility in code level. Yes, someone already made
that experiment. Dan used to clone many copies of domain 0 in XEN to
test robust of domain switch on XEN/IA64. But, that's just for test
purpose. :)


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