linux-kernel - Re: [PATCH v2 2/2] efi/libstub: Fix page table access in 5-level to 4-level paging transition

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Message-ID: <20251031153336.GJaQTW0GUyWc1CZla4@fat_crate.local>
Date: Fri, 31 Oct 2025 16:33:36 +0100
From: Borislav Petkov <bp@...en8.de>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: Usama Arif <usamaarif642@...il.com>, dwmw@...zon.co.uk,
	tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
	hpa@...or.com, x86@...nel.org, apopple@...dia.com, thuth@...hat.com,
	nik.borisov@...e.com, kas@...nel.org, linux-kernel@...r.kernel.org,
	linux-efi@...r.kernel.org, kernel-team@...a.com,
	Michael van der Westhuizen <rmikey@...a.com>,
	Tobias Fleig <tfleig@...a.com>
Subject: Re: [PATCH v2 2/2] efi/libstub: Fix page table access in 5-level to
 4-level paging transition

On Fri, Oct 31, 2025 at 03:43:25PM +0100, Ard Biesheuvel wrote:
> This code should be using native_pgd_val() not pgd_val().

Seems to fix it, thanks.

I'll let Usama do more testing along with the usual build smoke tests - all
permutations of the below:

ARCHES=('x86_64' 'i386')
SMOKE_CONFIGS=("allnoconfig" "defconfig" "allmodconfig" "allyesconfig")

Thx.

-- 
Regards/Gruss,
    Boris.

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