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KVM: fix spurious interrupt with irqfd
kvm didn't clear irqfd counter on deassign, as a result we could get a spurious interrupt when irqfd is assigned back. this leads to poor performance and, in theory, guest crash. Signed-off-by: Michael S. Tsirkin <email@example.com> Signed-off-by: Avi Kivity <firstname.lastname@example.org>
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