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

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1331048501 -3600
# Node ID 33980e36597b9f780ef515210863034b5e3080bf
# Parent  fb70e48ee3c2ea7060a97d9ddaa6dfc864f1efc0
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>
---


diff -r fb70e48ee3c2 -r 33980e36597b xen/arch/x86/acpi/cpu_idle.c
--- a/xen/arch/x86/acpi/cpu_idle.c      Tue Mar 06 16:11:59 2012 +0100
+++ b/xen/arch/x86/acpi/cpu_idle.c      Tue Mar 06 16:41:41 2012 +0100
@@ -45,6 +45,7 @@
 #include <xen/irq.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>
@@ -907,6 +908,9 @@
             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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