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[Xen-devel] [PATCH] x86/cpuidle: deny access to the I/O port used for EM_SYSIO


  • To: "xen-devel" <xen-devel@xxxxxxxxxxxxx>
  • From: "Jan Beulich" <JBeulich@xxxxxxxx>
  • Date: Tue, 06 Mar 2012 14:59:45 +0000
  • Delivery-date: Tue, 06 Mar 2012 15:00:06 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

Nothing, not even Dom0, should fiddle with this.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/acpi/cpu_idle.c
+++ b/xen/arch/x86/acpi/cpu_idle.c
@@ -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 @@ 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:



Attachment: x86-deny-C-state-port.patch
Description: Text document

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