From c279f333a7716b1b4e9f21beedaada751be1f2d5 Mon Sep 17 00:00:00 2001
From: Jan Beulich <jbeulich@novell.com>
Date: Mon, 9 Jul 2012 10:23:57 +0100
Subject: [PATCH] x86/cpuidle: deny access to the I/O port used for EM_SYSIO

Nothing, not even Dom0, should fiddle with this.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
xen-unstable changeset:   24970:33980e36597b
xen-unstable date:        Tue Mar 06 16:41:41 2012 +0100
---
 xen/arch/x86/acpi/cpu_idle.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/xen/arch/x86/acpi/cpu_idle.c b/xen/arch/x86/acpi/cpu_idle.c
index 6ae9d476a9..3fde934194 100644
--- a/xen/arch/x86/acpi/cpu_idle.c
+++ b/xen/arch/x86/acpi/cpu_idle.c
@@ -44,6 +44,7 @@
 #include <xen/sched-if.h>
 #include <asm/cache.h>
 #include <asm/io.h>
+#include <asm/iocap.h>
 #include <asm/hpet.h>
 #include <asm/processor.h>
 #include <xen/pmstat.h>
@@ -888,6 +889,9 @@ static void set_cx(
             cx->entry_method = ACPI_CSTATE_EM_HALT;
         break;
     case ACPI_ADR_SPACE_SYSTEM_IO:
+        if ( ioports_deny_access(dom0, cx->address, cx->address) )
+            printk(XENLOG_WARNING "Could not deny access to port %04x\n",
+                   cx->address);
         cx->entry_method = ACPI_CSTATE_EM_SYSIO;
         break;
     default:
-- 
2.39.5