linux-kernel - [PATCH 5/7] paravirtualization: Allow disabling legacy power management modes with paravirt kernels

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Date:	Wed, 01 Nov 2006 21:31:33 +1100
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Andi Kleen <ak@....de>
Cc:	Andi Kleen <ak@...e.de>, virtualization@...ts.osdl.org,
	Chris Wright <chrisw@...s-sol.org>, akpm@...l.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 5/7] paravirtualization: Allow disabling legacy power
	management modes with paravirt kernels

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@...are.com>
Signed-off-by: Chris Wright <chrisw@...s-sol.org>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>

===================================================================
--- 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"
 
@@ -2191,7 +2192,7 @@ 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;
 	}
===================================================================
--- 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;
 	}


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