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how to enable two vcpu's in Dom0 with xen?

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Hi there

By booting Ubuntu 16.04 with XEN I've only one CPU available. I think thats an good choise in many scenarios. But for my current project I need the power of two vcpu's on Dom0. What I have to do to get that?
I've tried with

Code:

xl vcpu-set 0 1
xl vcpu-pin 0 1 all all

Code:

xl vcpu-list
Name                                ID  VCPU  CPU State  Time(s) Affinity (Hard / Soft)
Domain-0                            0    0    0  r--    388.1  all / all
Domain-0                            0    1    -  --p      0.0  all / all

But the second core still does not run.

thanks in advance

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