linux-kernel - Re: [PATCH] x86/microcode: Allow early loading without initrd

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Date:	Sun, 26 Apr 2015 17:31:13 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Alexander Hirsch <1zeeky@...il.com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH] x86/microcode: Allow early loading without initrd

On Sun, 2015-04-26 at 17:03 +0200, Alexander Hirsch wrote:
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
 
>  config MICROCODE_EARLY
>  	bool "Early load microcode"
> -	depends on MICROCODE=y && BLK_DEV_INITRD
> +	depends on MICROCODE=y
>  	select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
>  	select MICROCODE_AMD_EARLY if MICROCODE_AMD
>  	default y

> --- a/arch/x86/kernel/cpu/microcode/intel_early.c
> +++ b/arch/x86/kernel/cpu/microcode/intel_early.c
> @@ -691,6 +691,9 @@ int __init save_microcode_in_initrd_intel(void)
>  	unsigned int count = mc_saved_data.mc_saved_count;
>  	struct microcode_intel *mc_saved[MAX_UCODE_COUNT];
>  	int ret = 0;
> +#ifndef BLK_DEV_INITRD

#ifndef CONFIG_BLK_DEV_INITRD?

> +	unsigned long initrd_start = 0;
> +#endif
>  
>  	if (count == 0)
>  		return ret;
> @@ -728,24 +731,32 @@ _load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
>  
>  void __init load_ucode_intel_bsp(void)
>  {
> -	u64 start, size;
> +	u64 start = 0, size = 0;
> +	struct mc_saved_data *mc_saved_data_p;
> +	unsigned long *mc_saved_in_initrd_p;
> +#ifdef BLK_DEV_INITRD

Likewise.

>  #ifdef CONFIG_X86_32
>  	struct boot_params *p;
>  
>  	p	= (struct boot_params *)__pa_nodebug(&boot_params);
>  	start	= p->hdr.ramdisk_image;
>  	size	= p->hdr.ramdisk_size;
> -
> -	_load_ucode_intel_bsp(
> -			(struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
> -			(unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
> -			start, size);
>  #else
>  	start	= boot_params.hdr.ramdisk_image + PAGE_OFFSET;
>  	size	= boot_params.hdr.ramdisk_size;
> -
> -	_load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd, start, size);
>  #endif
> +#endif
> +
> +#ifdef CONFIG_X86_32
> +	mc_saved_in_initrd_p =
> +		(unsigned long *)__pa_nodebug(mc_saved_in_initrd);
> +	mc_saved_data_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
> +#else
> +	mc_saved_data_p = &mc_saved_data;
> +	mc_saved_in_initrd_p = mc_saved_in_initrd;
> +#endif
> +
> +	_load_ucode_intel_bsp(mc_saved_data_p, mc_saved_in_initrd_p, start, size);
>  }
>  
>  void load_ucode_intel_ap(void)
> @@ -755,6 +766,9 @@ void load_ucode_intel_ap(void)
>  	unsigned long *mc_saved_in_initrd_p;
>  	unsigned long initrd_start_addr;
>  	enum ucode_state ret;
> +#ifndef BLK_DEV_INITRD

Likewise.

> +	unsigned long initrd_start = 0;
> +#endif
>  #ifdef CONFIG_X86_32
>  	unsigned long *initrd_start_p;
>  

Thanks,


Paul Bolle

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