tree b7d42841341af99bc42c6e82d664f712574f2f7d
parent 43a0db3537583b269083c8ec20dbe3388510ae54
author Jan Kiszka <jan.kiszka@siemens.com> 1317971977 +0200
committer Blue Swirl <blauwirbel@gmail.com> 1318763452 +0000

pc: Fix and clean up PIC-to-APIC IRQ path

The master PIC is connected to the LINTIN0 of the APICs. As the APIC
currently does not track the state of that line, we have to ask the PIC
to reinject its IRQ after the CPU picked up an event from the APIC.

This introduces pic_get_output to read the master PIC IRQ line state
without changing it. The APIC uses this function to decide if a PIC IRQ
should be reinjected on apic_update_irq. This reflects better how the
real hardware works.

The patch fixes some failures of the kvm unit tests apic and eventinj by
allowing to enable the proper CPU IRQ deassertion when the guest masks
some pending IRQs at PIC level.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>