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Only signal MSI/MSI-X events on rising edges. So far we re-triggered the interrupt sources even if the guest did no consumed the pending one, easily causing interrupt storms. Issue was observable with Linux 4.16 e1000e driver when MSI-X was used. Vector 2 was causing interrupt storms after the driver activated the device. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Jason Wang <jasowang@redhat.com>