linux-kernel - Re: [PATCH v7 6/9] x86/boot: Move mem_encrypt= parsing to the decompressor

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Date: Fri, 1 Mar 2024 20:16:40 +0100
From: Borislav Petkov <bp@...en8.de>
To: Ard Biesheuvel <ardb+git@...gle.com>
Cc: linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
	Kevin Loughlin <kevinloughlin@...gle.com>,
	Tom Lendacky <thomas.lendacky@....com>,
	Dionna Glaze <dionnaglaze@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Andy Lutomirski <luto@...nel.org>, Brian Gerst <brgerst@...il.com>
Subject: Re: [PATCH v7 6/9] x86/boot: Move mem_encrypt= parsing to the
 decompressor

On Tue, Feb 27, 2024 at 04:19:14PM +0100, Ard Biesheuvel wrote:
> diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
> index 01d19fc22346..eeea058cf602 100644
> --- a/arch/x86/include/uapi/asm/bootparam.h
> +++ b/arch/x86/include/uapi/asm/bootparam.h
> @@ -38,6 +38,7 @@
>  #define XLF_EFI_KEXEC			(1<<4)
>  #define XLF_5LEVEL			(1<<5)
>  #define XLF_5LEVEL_ENABLED		(1<<6)
> +#define XLF_MEM_ENCRYPTION		(1<<7)

Needs documenting in Documentation/arch/x86/boot.rst.

And yes, those 5LEVEL things are not documented either but I'm even
questioning the justification for their existence. We'll see...

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette