linux-kernel - Re: [REGRESSION] x86_32 boot hang in 6.19-rc7 caused by b505f1944535 ("x86/kfence: avoid writing L1TF-vulnerable PTEs")

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Message-ID: <dc5326fa-955b-44fe-abbd-ab1bf0675529@intel.com>
Date: Mon, 26 Jan 2026 12:36:25 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
 Ryusuke Konishi <konishi.ryusuke@...il.com>
Cc: Andrew Cooper <andrew.cooper3@...rix.com>, Marco Elver
 <elver@...gle.com>, LKML <linux-kernel@...r.kernel.org>,
 Alexander Potapenko <glider@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
 Jann Horn <jannh@...gle.com>, kasan-dev@...glegroups.com,
 stable <stable@...r.kernel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [REGRESSION] x86_32 boot hang in 6.19-rc7 caused by b505f1944535
 ("x86/kfence: avoid writing L1TF-vulnerable PTEs")

On 1/26/26 12:24, Andrew Morton wrote:
> I see that b505f1944535 prevented a Xen warning, but did it have any
> other runtime effects?  If not, a prompt revert may be the way to
> proceed for now.

Yeah, that's fine.

At the same time ... KFENCE folks: I wonder if you've been testing on
highmem and/or 32-bit x86 builds or if there's much value to keeping
KFENCE maintained there.