From 841caa40908407edf7d8d0960c9c5c869dedfc73 Mon Sep 17 00:00:00 2001
From: Peter Grehan <grehan@FreeBSD.org>
Date: Fri, 6 Sep 2013 05:55:43 +0000
Subject: [PATCH] Allow level-triggered interrupt sources. While this isn't
 precisely emulated, it is good enough for the single consumer i.e. irq4, the
 serial port on Linux.

---
 usr.sbin/bhyve/ioapic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/usr.sbin/bhyve/ioapic.c b/usr.sbin/bhyve/ioapic.c
index c712692c937..114b4462ae5 100644
--- a/usr.sbin/bhyve/ioapic.c
+++ b/usr.sbin/bhyve/ioapic.c
@@ -101,13 +101,13 @@ ioapic_set_pinstate(struct vmctx *ctx, int pin, bool newstate)
 	 * XXX
 	 * We only deal with:
 	 * - edge triggered interrupts
-	 * - physical destination mode
 	 * - fixed delivery mode
+	 *  Level-triggered sources will work so long as their is
+	 * no sharing.
 	 */
 	low = ioapic->redtbl[pin];
 	high = ioapic->redtbl[pin] >> 32;
 	if ((low & IOART_INTMASK) == IOART_INTMCLR &&
-	    (low & IOART_TRGRMOD) == IOART_TRGREDG &&
 	    (low & IOART_DESTMOD) == IOART_DESTPHY &&
 	    (low & IOART_DELMOD) == IOART_DELFIXED) {
 		vector = low & IOART_INTVEC;