linux-kernel - Re: [PATCH 4/6] x86/cpu: Add platform ID to CPU info structure

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Message-ID: <cf6700c3-8ba9-4dc0-a305-1be1f00c0fba@intel.com>
Date: Tue, 10 Feb 2026 15:23:32 -0800
From: Sohil Mehta <sohil.mehta@...el.com>
To: Dave Hansen <dave.hansen@...ux.intel.com>, <linux-kernel@...r.kernel.org>
CC: <zhao1.liu@...el.com>, Borislav Petkov <bp@...en8.de>, "H. Peter Anvin"
	<hpa@...or.com>, Ingo Molnar <mingo@...hat.com>, Jon Kohler
	<jon@...anix.com>, Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, "Peter
 Zijlstra (Intel)" <peterz@...radead.org>, Thomas Gleixner <tglx@...nel.org>,
	Tony Luck <tony.luck@...el.com>, <x86@...nel.org>
Subject: Re: [PATCH 4/6] x86/cpu: Add platform ID to CPU info structure

On 2/6/2026 3:14 PM, Dave Hansen wrote:
> 
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> The end goal here is to be able to do x86_match_cpu() and match on a
> specific platform ID. While it would be possible to stash this ID
> off somewhere or read it dynamically, that approaches would not be
> consistent with the other fields which can be matched.
> 
> Read the platform ID and store it in cpuinfo_x86->x86_platform_id.
> 
> There are lots of sites to set this new field. Place it near
> the place c->microcode is established since the platform ID is
> so closely intertwined with microcode updates.
> 
> Note: This should not grow the size of 'struct cpuinfo_x86' in
> practice since the u8 fits next to another u8 in the structure.
> 
> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>

Reviewed-by: Sohil Mehta <sohil.mehta@...el.com>