KVM: Let host know whether the guest can handle async PF in non-userspace context.
If guest can detect that it runs in non-preemptable context it can handle async PFs at any time, so let host know that it can send async PF even if guest cpu is not in userspace. Acked-by:Rik van Riel <riel@redhat.com> Signed-off-by:
Gleb Natapov <gleb@redhat.com> Signed-off-by:
Marcelo Tosatti <mtosatti@redhat.com>
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