linux-kernel - RE: [PATCH v6 00/49] New Intel CPUID families

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Date: Tue, 21 May 2024 15:21:08 +0000
From: "Luck, Tony" <tony.luck@...el.com>
To: Borislav Petkov <bp@...en8.de>
CC: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Dave
 Hansen <dave.hansen@...ux.intel.com>, "x86@...nel.org" <x86@...nel.org>, "H.
 Peter Anvin" <hpa@...or.com>, "Peter Zijlstra (Intel)"
	<peterz@...radead.org>, Uros Bizjak <ubizjak@...il.com>, "Edgecombe, Rick P"
	<rick.p.edgecombe@...el.com>, Arnd Bergmann <arnd@...db.de>, Mateusz Guzik
	<mjguzik@...il.com>, Thomas Renninger <trenn@...e.de>, Andi Kleen
	<ak@...ux.intel.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "patches@...ts.linux.dev"
	<patches@...ts.linux.dev>
Subject: RE: [PATCH v6 00/49] New Intel CPUID families

>> - Please consider patches 0001 & 0002 as urgent to fix a regression.
>>
>> 1 and 2?
>
> Only 2 I think...

Patch 2 fixes the existing regression. But if you apply just that patch it
will create a new regression. Patch 1 fixes the place where someone
isn't using the X86_MATCH macros. Just open coding:

   { .vendor = X86_VENDOR_INTEL, .family = 6, .model = INTEL_FAM6_SKYLAKE_X },

so they don't set .flags  Patch 2 changes x86_match_cpu() to just use flags as the
end marker for the array:

    for (m = match; m->flags & X86_CPU_ID_FLAG_ENTRY_VALID; m++) {

-Tony