linux-kernel - Re: [PATCH v1 05/21] arm64/kexec: refactor for kernel/Kconfig.kexec

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Date:   Wed, 14 Jun 2023 09:22:35 +0800
From:   "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:     Eric DeVolder <eric.devolder@...cle.com>, <linux@...linux.org.uk>,
        <catalin.marinas@....com>, <will@...nel.org>,
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Subject: Re: [PATCH v1 05/21] arm64/kexec: refactor for kernel/Kconfig.kexec



On 2023/6/13 1:27, Eric DeVolder wrote:
> The kexec and crash kernel options are provided in the common
> kernel/Kconfig.kexec. Utilize the common options and provide
> the ARCH_HAS_ and ARCH_SUPPORTS_ entries to recreate the
> equivalent set of KEXEC and CRASH options.
> 
> Signed-off-by: Eric DeVolder <eric.devolder@...cle.com>
> ---
>  arch/arm64/Kconfig | 61 ++++++++--------------------------------------
>  1 file changed, 10 insertions(+), 51 deletions(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 343e1e1cae10..33552476a877 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1433,60 +1433,19 @@ config PARAVIRT_TIME_ACCOUNTING
>  
>  	  If in doubt, say N here.
>  
> -config KEXEC
> -	depends on PM_SLEEP_SMP
> -	select KEXEC_CORE
> -	bool "kexec system call"
> -	help
> -	  kexec is a system call that implements the ability to shutdown your
> -	  current kernel, and to start another kernel.  It is like a reboot
> -	  but it is independent of the system firmware.   And like a reboot
> -	  you can start any kernel with it, not just Linux.
> -
> -config KEXEC_FILE
> -	bool "kexec file based system call"
> -	select KEXEC_CORE
> -	select HAVE_IMA_KEXEC if IMA
> -	help
> -	  This is new version of kexec system call. This system call is
> -	  file based and takes file descriptors as system call argument
> -	  for kernel and initramfs as opposed to list of segments as
> -	  accepted by previous system call.
> -
> -config KEXEC_SIG
> -	bool "Verify kernel signature during kexec_file_load() syscall"
> -	depends on KEXEC_FILE
> -	help
> -	  Select this option to verify a signature with loaded kernel
> -	  image. If configured, any attempt of loading a image without
> -	  valid signature will fail.
> -
> -	  In addition to that option, you need to enable signature
> -	  verification for the corresponding kernel image type being
> -	  loaded in order for this to work.
> +config ARCH_HAS_KEXEC
> +	def_bool PM_SLEEP_SMP
>  
> -config KEXEC_IMAGE_VERIFY_SIG
> -	bool "Enable Image signature verification support"
> -	default y
> -	depends on KEXEC_SIG
> -	depends on EFI && SIGNED_PE_FILE_VERIFICATION
> -	help
> -	  Enable Image signature verification support.

I don't see an alternative to this option. It's used in
arch/arm64/kernel/kexec_image.c:135

> -
> -comment "Support for PE file signature verification disabled"
> -	depends on KEXEC_SIG
> -	depends on !EFI || !SIGNED_PE_FILE_VERIFICATION
> +config ARCH_HAS_KEXEC_FILE
> +	def_bool y
>  
> -config CRASH_DUMP
> -	bool "Build kdump crash kernel"
> -	help
> -	  Generate crash dump after being started by kexec. This should
> -	  be normally only set in special crash dump kernels which are
> -	  loaded in the main kernel with kexec-tools into a specially
> -	  reserved region and then later executed after a crash by
> -	  kdump/kexec.
> +config ARCH_SUPPORTS_KEXEC_FILE
> +	def_bool y
> +	depends on KEXEC_FILE
> +	select HAVE_IMA_KEXEC if IMA
>  
> -	  For more details see Documentation/admin-guide/kdump/kdump.rst
> +config ARCH_HAS_CRASH_DUMP
> +	def_bool y
>  
>  config TRANS_TABLE
>  	def_bool y
> 

-- 
Regards,
  Zhen Lei