KVM: Don't shrink/grow vCPU halt_poll_ns if host side polling is disabled
Don't waste cycles to shrink/grow vCPU halt_poll_ns if host side polling is disabled. Acked-by:Marcelo Tosatti <mtosatti@redhat.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:
Wanpeng Li <wanpengli@tencent.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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