Jan Beulich
2012-Mar-06 14:59 UTC
[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>
--- 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:
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Keir Fraser
2012-Mar-06 15:15 UTC
Re: [PATCH] x86/cpuidle: deny access to the I/O port used for EM_SYSIO
On 06/03/2012 14:59, "Jan Beulich" <JBeulich@suse.com> wrote:> Nothing, not even Dom0, should fiddle with this. > > Signed-off-by: Jan Beulich <jbeulich@suse.com>Acked-by: Keir Fraser <keir@xen.org>> --- 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: > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xen.org > http://lists.xen.org/xen-devel