linux-kernel - Re: [PATCH] x86/efi: skip bgrt init for kexec reboot

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Date:	Thu, 4 Feb 2016 05:42:00 +0800
From:	Dave Young <dyoung@...hat.com>
To:	linux-efi@...r.kernel.org, matt@...eblueprint.co.uk
Cc:	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/efi: skip bgrt init for kexec reboot


On 01/27/16 at 07:20pm, Dave Young wrote:
> For kexec reboot the bgrt image address could contains random data because
> we have freed boot service areas in 1st kernel boot phase. One possible
> result is kmalloc fail in efi_bgrt_init due to large random image size.
> 
> So change efi_late_init to avoid efi_bgrt_init in case kexec boot.
> 
> Signed-off-by: Dave Young <dyoung@...hat.com>
> ---
>  arch/x86/platform/efi/efi.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> --- linux-x86.orig/arch/x86/platform/efi/efi.c
> +++ linux-x86/arch/x86/platform/efi/efi.c
> @@ -531,7 +531,8 @@ void __init efi_init(void)
>  
>  void __init efi_late_init(void)
>  {
> -	efi_bgrt_init();
> +	if (!efi_setup)
> +		efi_bgrt_init();
>  }
>  
>  void __init efi_set_executable(efi_memory_desc_t *md, bool executable)

Matt, opinions about this patch?

Thanks
Dave