From 0035e5094c9e01c8227db2ddc0c607e3f6bc33b7 Mon Sep 17 00:00:00 2001
From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Mon, 22 Aug 2011 17:46:42 +0200
Subject: [PATCH] ioapic: Implement polarity

If the polarity bit is set in the redirection table, the input level
simply has to inverted as it is low active in this case.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 hw/ioapic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/ioapic.c b/hw/ioapic.c
index 5916387f0d..61991d7679 100644
--- a/hw/ioapic.c
+++ b/hw/ioapic.c
@@ -148,6 +148,9 @@ static void ioapic_set_irq(void *opaque, int vector, int level)
         uint32_t mask = 1 << vector;
         uint64_t entry = s->ioredtbl[vector];
 
+        if (entry & (1 << IOAPIC_LVT_POLARITY_SHIFT)) {
+            level = !level;
+        }
         if (((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1) ==
             IOAPIC_TRIGGER_LEVEL) {
             /* level triggered */