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[Xen-devel] Vcpu allocation for a newly created domU

Hi all,

 I am having confusion regarding the way a newly created domain is
allocated vcpu. 
 Initially during dom0 creation alloc_vcpu is called to create vcpu
structs for all the available cpu's and assigned to dom0. But its not
the case for domU creation.
1. So how will dom0 relinquish/share vcpu to/with a newly created domU.
Does this happen as part of the shared_info page mapping??
2. Till the end of DOMCTL_createdomain hypercall d->vcpu is null but by
the start of xc_linux_bulid_internal function d->vcpu is pointing to
some vcpu. How is this??
3. As part of the domU config file we can constraint the domU to a
specific CPU. How is this achieved unless there is an explict way of
assigning vcpu associated with that cpu number. 
  I apologise if the questions seem vague and silly. Any kind of hints
or pointers would be very helpful.

Thanks in advance


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