[Xen-changelog] [xen-4.1-testing] x86/cpuidle: deny access to the I/O port used for EM_SYSIO

[Xen patchbot-4.1-testing <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxxxx>
# Date 1341825837 -3600
# Node ID 01366a3245870bed6666f98d498528697d082701
# Parent  3b50ea3909a87473b6c19849099f156be53599c5
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@xxxxxxxx>
Acked-by: Keir Fraser <keir@xxxxxxx>
xen-unstable changeset:   24970:33980e36597b
xen-unstable date:        Tue Mar 06 16:41:41 2012 +0100
---


diff -r 3b50ea3909a8 -r 01366a324587 xen/arch/x86/acpi/cpu_idle.c
--- a/xen/arch/x86/acpi/cpu_idle.c      Mon Jul 09 10:23:30 2012 +0100
+++ b/xen/arch/x86/acpi/cpu_idle.c      Mon Jul 09 10:23:57 2012 +0100
@@ -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:

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