x86/kvm: Convert to hotplug state machine

Install the callbacks via the state machine. The online & down callbacks are
invoked on the target CPU so we can avoid using smp_call_function_single().
local_irq_disable() is used because smp_call_function_single() used to invoke
the function with interrupts disabled.

Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Reviewed-by: Paolo Bonzini <[email protected]>
Cc: [email protected]
Cc: Peter Zijlstra <[email protected]>
Cc: Gleb Natapov <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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