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    Subject[PATCH 5/7] 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@vmware.com>
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    Cc: Rusty Russell <rusty@rustcorp.com.au>
    Cc: Jeremy Fitzhardinge <jeremy@goop.org>

    ---
    arch/i386/kernel/apm.c | 3 ++-
    drivers/pnp/pnpbios/core.c | 3 ++-
    2 files changed, 4 insertions(+), 2 deletions(-)

    --- linux-2.6-pv.orig/arch/i386/kernel/apm.c
    +++ linux-2.6-pv/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;
    }
    --- linux-2.6-pv.orig/drivers/pnp/pnpbios/core.c
    +++ linux-2.6-pv/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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