Hi All,

a) As per GIC-400 all Physical interrupts trap into hypervisor b) Hypervisor does ACK, programs Virtual GIC list registers (with PhysIRQ:VIRQ) and does a world switch. c) GIC CPU I/f interrupts Guest with the VIRQ d) Guest does a ACK and EOI to GIC cpu i/f e) Hypervisor gets a maintenance interrupt when Guest Does an EOI f) Hypervisor then clears the Physical Interrupt

So for 1 interrupt there are so many context switches ? Is the sequence right. If I am missing anything please let me know ..

Also, If a device is private to a guest, so many context switches would reduce the performance if the device interrupts a lot.

My question is that a) Is the above flow correct ? b) Is this the only flow or there exists some optimisations

Thanks and Regards