From e9bddfef0b2bc796a7d9eb9f65126b20510a0e36 Mon Sep 17 00:00:00 2001
From: royger <royger@FreeBSD.org>
Date: Thu, 3 Dec 2015 11:05:35 +0000
Subject: MFC r291024:

xen: fix dropping bitmap IPIs during resume

Sponsored by:		Citrix Systems R&D
---
 sys/dev/xen/control/control.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'sys/dev')

diff --git a/sys/dev/xen/control/control.c b/sys/dev/xen/control/control.c
index bc0609d..60e448a 100644
--- a/sys/dev/xen/control/control.c
+++ b/sys/dev/xen/control/control.c
@@ -127,6 +127,7 @@ __FBSDID("$FreeBSD$");
 
 #include <machine/_inttypes.h>
 #include <machine/intr_machdep.h>
+#include <machine/apicvar.h>
 
 #include <vm/vm.h>
 #include <vm/vm_extern.h>
@@ -403,6 +404,8 @@ xctrl_suspend()
 	gnttab_resume();
 
 #ifdef SMP
+	/* Send an IPI_BITMAP in case there are pending bitmap IPIs. */
+	lapic_ipi_vectored(IPI_BITMAP_VECTOR, APIC_IPI_DEST_ALL);
 	if (smp_started && !CPU_EMPTY(&cpu_suspend_map)) {
 		/*
 		 * Now that event channels have been initialized,
-- 
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