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Re: [Xen-users] Xen Not Support multi-cpu??

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Xen Not Support multi-cpu??
From: Xin Chen <xcheney@xxxxxxxxxxxxxx>
Date: Wed, 14 Mar 2007 09:51:24 +1100
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Cool!
Thanks u guys:)

cheers!
xin

Petersson, Mats wrote:



-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Xin Chen
Sent: 13 March 2007 01:55
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Xen Not Support multi-cpu??

OK! I see now. For guest system, they only know virtual cpu which domain 0 made.Domain0 is incharge of real cpus.
Great. Thanks!

To be VERY PEDANTIC: VCPU's are what ALL domains "know". The REAL CPU's
are handled by the hypervisor only. Whilst it's true that Dom0 gives the
instructions about how many real and virtual CPU's a guest should use,
it still is the hypervisor that enforces, controls and guarantees this.
Dom0 in the sense of the Hypervisor is another guest - it just so
happens that it's got the "privileged flag" set. Think of Dom0 as a
"root" user in Unix, and DomU as a "regular user", and you get the idea.

--
Mats




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