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ioapic: Implement EOI handling for level-triggered IRQs

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Add the missing EOI broadcast from local APIC to the IOAPICs on
completion of level-triggered IRQs. This ensures that a still asserted
IRQ source properly re-triggers an APIC IRQ.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2011-02-03 22:54:11 +01:00 • committed by Anthony Liguori
parent 73eb4c04e9
commit 0280b571c1
3 changed files with 67 additions and 5 deletions
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9
hw/apic.c
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@ -18,6 +18,7 @@
*/
#include "hw.h"
#include "apic.h"
#include "ioapic.h"
#include "qemu-timer.h"
#include "host-utils.h"
#include "sysbus.h"
@ -57,7 +58,8 @@
#define ESR_ILLEGAL_ADDRESS (1 << 7)
#define APIC_SV_ENABLE (1 << 8)
#define APIC_SV_DIRECTED_IO (1<<12)
#define APIC_SV_ENABLE (1<<8)
#define MAX_APICS 255
#define MAX_APIC_WORDS 8
@ -420,8 +422,9 @@ static void apic_eoi(APICState *s)
if (isrv < 0)
return;
reset_bit(s->isr, isrv);
/* XXX: send the EOI packet to the APIC bus to allow the I/O APIC to
set the remote IRR bit for level triggered interrupts. */
if (!(s->spurious_vec & APIC_SV_DIRECTED_IO) && get_bit(s->tmr, isrv)) {
ioapic_eoi_broadcast(isrv);
}
apic_update_irq(s);
}