-
Rusty Russell authored
Lguest's "iret" is non-atomic, as it needs to restore the interrupt state before the real iret (the guest can't actually suppress interrupts). For this reason, the host discards an interrupt if it occurs in this (1-instruction) window. We can do better, by emulating the iret execution, then immediately setting up the interrupt handler. In fact, we don't need to do much, as emulating the iret and setting up th stack for the interrupt handler basically cancel each other out. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
3eebd233