kvm, rt: change async pagefault code locking for PREEMPT_RT
The async pagefault wake code can run from the idle task in exception context, so everything here needs to be made non-preemptible. Conversion to a simple wait queue and raw spinlock does the trick. Signed-off-by:Rik van Riel <riel@redhat.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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