[PATCH] paravirt: Allow disable power management under hypervisor

Two legacy power management modes are much easier to just explicitly disable
when running in paravirtualized mode - neither APM nor PnP is still relevant.
The status of ACPI is still debatable, and noacpi is still a common enough
boot parameter that it is not necessary to explicitly disable ACPI.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>

2 files changed, 4 insertions, 2 deletions

diff --git a/arch/i386/kernel/apm.c b/arch/i386/kernel/apm.c
index a60358fe9a49..a97847da9ed5 100644
--- a/arch/i386/kernel/apm.c
+++ b/arch/i386/kernel/apm.c
@@ -231,6 +231,7 @@
 #include <asm/uaccess.h>
 #include <asm/desc.h>
 #include <asm/i8253.h>
+#include <asm/paravirt.h>
 
 #include "io_ports.h"
 
@@ -2235,7 +2236,7 @@ static int __init apm_init(void)
 
         dmi_check_system(apm_dmi_table);
 
-        if (apm_info.bios.version == 0) {
+        if (apm_info.bios.version == 0 || paravirt_enabled()) {
                 printk(KERN_INFO "apm: BIOS not found.\n");
                 return -ENODEV;
         }
diff --git a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c
index 81a6c83d89a6..80066ad792f7 100644
--- a/drivers/pnp/pnpbios/core.c
+++ b/drivers/pnp/pnpbios/core.c
@@ -530,7 +530,8 @@ static int __init pnpbios_init(void)
         if (check_legacy_ioport(PNPBIOS_BASE))
                 return -ENODEV;
 #endif
-        if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table)) {
+        if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) ||
+            paravirt_enabled()) {
                 printk(KERN_INFO "PnPBIOS: Disabled\n");
                 return -ENODEV;
         }