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Message-ID: <8a97f096-2bdc-0298-a1c5-8d48dbf94179@oracle.com>
Date: Wed, 14 Jun 2023 07:01:04 -0500
From: Eric DeVolder <eric.devolder@...cle.com>
To: Kees Cook <keescook@...omium.org>
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Subject: Re: [PATCH v1 00/21] refactor Kconfig to consolidate KEXEC and CRASH
options
On 6/13/23 15:21, Kees Cook wrote:
> On Mon, Jun 12, 2023 at 01:27:52PM -0400, Eric DeVolder wrote:
>> The Kconfig is refactored to consolidate KEXEC and CRASH options from
>> various arch/<arch>/Kconfig files into new file kernel/Kconfig.kexec.
>
> This looks very nice!
>
Thank you Kees!
>> [...]
>> - The boolean ARCH_HAS_<option> in effect allows the arch to determine
>> when the feature is allowed. Archs which don't have the feature
>> simply do not provide the corresponding ARCH_HAS_<option>.
>> For each arch, where there previously were KEXEC and/or CRASH
>> options, these have been replaced with the corresponding boolean
>> ARCH_HAS_<option>, and an appropriate def_bool statement.
>>
>> For example, if the arch supports KEXEC_FILE, then the
>> ARCH_HAS_KEXEC_FILE simply has a 'def_bool y'. This permits the
>> KEXEC_FILE option to be available.
>>
>> If the arch has a 'depends on' statement in its original coding
>> of the option, then that expression becomes part of the def_bool
>> expression. For example, arm64 had:
>>
>> config KEXEC
>> depends on PM_SLEEP_SMP
>>
>> and in this solution, this converts to:
>>
>> config ARCH_HAS_KEXEC
>> def_bool PM_SLEEP_SMP
>>
>>
>> - In order to account for the differences in the config coding for
>> the three common options, the ARCH_SUPPORTS_<option> is used.
>> This options has a 'depends on <option>' statement to couple it
>> to the main option, and from there can insert the differences
>> from the common option and the arch original coding of that option.
>>
>> For example, a few archs enable CRYPTO and CRYTPO_SHA256 for
>> KEXEC_FILE. These require a ARCH_SUPPORTS_KEXEC_FILE and
>> 'select CRYPTO' and 'select CRYPTO_SHA256' statements.
>
> Naming nit: "HAS" and "SUPPORTS" feel very similar, and looking at
> existing configs, "ARCH_SUPPORTS_..." is already used for doing this
> kind of bare "bool" management. e.g. see ARCH_SUPPORTS_INT128
>
> It looks like you need to split "depends" and "select" so the options
> can be chosen separately from the "selectable" configs.
>
> How about naming this ARCH_SELECTS_<option>, since that's what it's
> there for?
>
I'm OK with this. Let's see if others agree?
Thank you!
eric
> -Kees
>
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