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Message-ID: <20240517173811.GFZkeWAzKjYtEMwe1e@fat_crate.local>
Date: Fri, 17 May 2024 19:38:11 +0200
From: Borislav Petkov <bp@...en8.de>
To: Tony Luck <tony.luck@...el.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
Uros Bizjak <ubizjak@...il.com>,
Rick Edgecombe <rick.p.edgecombe@...el.com>,
Arnd Bergmann <arnd@...db.de>, Mateusz Guzik <mjguzik@...il.com>,
Thomas Renninger <trenn@...e.de>,
Greg Kroah-Hartman <gregkh@...e.de>,
Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
patches@...ts.linux.dev
Subject: Re: [PATCH v3] x86/cpu: Fix x86_match_cpu() to match just
X86_VENDOR_INTEL
On Fri, May 17, 2024 at 10:21:34AM -0700, Tony Luck wrote:
> diff --git a/arch/x86/kernel/cpu/match.c b/arch/x86/kernel/cpu/match.c
> index 8651643bddae..996f96cfce68 100644
> --- a/arch/x86/kernel/cpu/match.c
> +++ b/arch/x86/kernel/cpu/match.c
> @@ -39,7 +39,7 @@ const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match)
> struct cpuinfo_x86 *c = &boot_cpu_data;
>
> for (m = match;
> - m->vendor | m->family | m->model | m->steppings | m->feature;
> + m->vendor | m->family | m->model | m->steppings | m->feature | m->flags;
I think this should not do anything implicit even if it is correct but
should explicitly check
if (!(m->flags & X86_CPU_ID_FLAG_VENDOR_VALID))
continue;
I don't have a clear idea how exactly yet - I need to play with it.
Maybe this stupid flow in the loop should be finally fixed into
something more readable and sensible...
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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