linux-kernel - Re: [PATCH v2 02/13] x86/kexec: refactor for kernel/Kconfig.kexec

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Date:   Tue, 20 Jun 2023 16:21:42 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Eric DeVolder <eric.devolder@...cle.com>
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Subject: Re: [PATCH v2 02/13] x86/kexec: refactor for kernel/Kconfig.kexec

Hi Eric,

On 06/19/23 at 10:57am, Eric DeVolder wrote:
......
> +config ARCH_SUPPORTS_KEXEC
> +	def_bool y
>  
> -config ARCH_HAS_KEXEC_PURGATORY
> -	def_bool KEXEC_FILE
> +config ARCH_SUPPORTS_KEXEC_FILE
> +	def_bool X86_64 && CRYPTO && CRYPTO_SHA256
......  
> +config ARCH_SELECTS_KEXEC_FILE
> +	def_bool y
>  	depends on KEXEC_FILE
> -	help

I am a little confused about this ARCH_SELECTS_XX adding. Wondering what
limits us defining the ARCH_SUPPORTS_KEXEC_FILE like below? I have limited
knowledge about Kconfig, please correct me if I am wrong. Thanks in
advance.

 +config ARCH_SUPPORTS_KEXEC_FILE
 +	def_bool y
  	depends on KEXEC_FILE
  	depends on X86_64 && CRYPTO && CRYPTO_SHA256

> -
> -	  This option makes the kexec_file_load() syscall check for a valid
> -	  signature of the kernel image.  The image can still be loaded without
> -	  a valid signature unless you also enable KEXEC_SIG_FORCE, though if
> -	  there's a signature that we can check, then it must be valid.
> -
> -	  In addition to this option, you need to enable signature
> -	  verification for the corresponding kernel image type being
> -	  loaded in order for this to work.
> -