From: "H. Peter Anvin" <hpa@zytor.com>
To: Maciej Wieczor-Retman <m.wieczorretman@pm.me>,
Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org
Cc: pawel.chmielewski@linux.intel.com,
Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 3/3] x86/cpu: Required feature bits sanity check
Date: Fri, 13 Feb 2026 12:17:02 -0800 [thread overview]
Message-ID: <5fd597a1-46fe-4f46-98ee-d346260c85b5@zytor.com> (raw)
In-Reply-To: <1bfbcdf7d2d7d5a1180e0de92d14cd6c246d5ea5.1770908783.git.m.wieczorretman@pm.me>
On 2026-02-12 07:35, Maciej Wieczor-Retman wrote:
> From: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
>
> After cpu identification concludes, do a sanity check by comparing the
> final x86_capability bitmask with the pre-defined required feature bits.
>
> Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
For as much as it matters (since I originally requested Maciej implemented this):
Acked-by: H. Peter Anvin (Intel) <hpa@zytor.com>
We really, really need this. We have this check in the BIOS boot stub, but
none of the modern stubs have included the equivalent code.
-hpa
next prev parent reply other threads:[~2026-02-13 20:17 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-12 15:33 [PATCH v5 0/3] x86: Capability bits fix and required " Maciej Wieczor-Retman
2026-02-12 15:34 ` [PATCH v5 1/3] x86/cpu: Clear feature bits disabled at compile-time Maciej Wieczor-Retman
2026-02-12 15:58 ` Borislav Petkov
2026-02-12 16:23 ` Maciej Wieczor-Retman
2026-02-12 21:34 ` H. Peter Anvin
2026-02-12 21:51 ` Borislav Petkov
2026-02-12 23:04 ` Sohil Mehta
2026-02-12 23:47 ` Borislav Petkov
2026-02-13 0:14 ` Sohil Mehta
2026-02-13 0:36 ` Sohil Mehta
2026-02-13 0:58 ` Borislav Petkov
2026-02-13 20:11 ` H. Peter Anvin
2026-02-12 15:35 ` [PATCH v5 2/3] x86/cpu: Check if feature string is non-zero Maciej Wieczor-Retman
2026-02-13 0:28 ` Sohil Mehta
2026-02-13 10:02 ` Maciej Wieczor-Retman
2026-02-13 18:22 ` Sohil Mehta
2026-02-13 19:10 ` Maciej Wieczor-Retman
2026-02-13 20:00 ` Sohil Mehta
2026-02-13 20:26 ` Maciej Wieczor-Retman
2026-02-13 20:15 ` H. Peter Anvin
2026-02-13 20:24 ` Maciej Wieczor-Retman
2026-02-12 15:35 ` [PATCH v5 3/3] x86/cpu: Required feature bits sanity check Maciej Wieczor-Retman
2026-02-13 20:17 ` H. Peter Anvin [this message]
2026-02-13 20:23 ` [PATCH v5 0/3] x86: Capability bits fix and required " H. Peter Anvin
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