linux-kernel - Re: [PATCH v2] efi/x86: Ensure that EFI_RUNTIME

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Message-ID: <20230802164603.fzy2lmflp4iann5c@box>
Date:   Wed, 2 Aug 2023 19:46:03 +0300
From:   "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        x86@...nel.org
Subject: Re: [PATCH v2] efi/x86: Ensure that EFI_RUNTIME_MAP is enabled for
 kexec

On Wed, Aug 02, 2023 at 05:17:04PM +0200, Ard Biesheuvel wrote:
> CONFIG_EFI_RUNTIME_MAP needs to be enabled in order for kexec to be able
> to provide the required information about the EFI runtime mappings to
> the incoming kernel, regardless of whether kexec_load() or
> kexec_file_load() is being used. Without this information, kexec boot in
> EFI mode is not possible.
> 
> The CONFIG_EFI_RUNTIME_MAP option is currently directly configurable if
> CONFIG_EXPERT is enabled, so that it can be turned on for debugging
> purposes even if KEXEC is. However, the upshot of this is that it can

s/is/isn't/ ?

> also be disabled even when it shouldn't.
> 
> So tweak the Kconfig declarations to avoid this situation.
> 
> Reported-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>

Tested-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
  Kiryl Shutsemau / Kirill A. Shutemov