KVM: Optimize searching for highest IRR
Most of the time IRR is empty, so instead of scanning the whole IRR on each VM entry keep a variable that tells us if IRR is not empty. IRR will have to be scanned twice on each IRQ delivery, but this is much more rare than VM entry. Signed-off-by:Gleb Natapov <gleb@redhat.com> Signed-off-by:
Avi Kivity <avi@redhat.com>
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