Re: [PATCH] x86/reboot: Avoid EFI reboot when not running on EFI

[Thomas Gleixner <tglx@linutronix.de>]

On Thu, 29 Aug 2019, Rob Bradford wrote:

CC+ Ard

> Replace the check using efi_runtime_disabled() which only checks if EFI
> runtime was disabled on the kernel command line with a call to
> efi_enabled(EFI_RUNTIME_SERVICES) to check if EFI runtime services are
> available.
> 
> In the situation where the kernel was booted without an EFI environment
> then only efi_enabled(EFI_RUNTIME_SERVICES) correctly represents that no
> EFI is available. Setting "noefi" or "efi=noruntime" on the commandline
> continue to have the same effect as efi_enabled(EFI_RUNTIME_SERVICES)
> will return false.
>
>
> Signed-off-by: Rob Bradford <robert.bradford@intel.com>
> ---
>  arch/x86/kernel/reboot.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
> index 09d6bded3c1e..0b0a7fccdb00 100644
> --- a/arch/x86/kernel/reboot.c
> +++ b/arch/x86/kernel/reboot.c
> @@ -500,7 +500,7 @@ static int __init reboot_init(void)
>  	 */
>  	rv = dmi_check_system(reboot_dmi_table);
>  
> -	if (!rv && efi_reboot_required() && !efi_runtime_disabled())
> +	if (!rv && efi_reboot_required() && efi_enabled(EFI_RUNTIME_SERVICES))

Why is efi_reboot_required() set at all in that situation?

Thanks,

	tglx