linux-kernel - Re: [PATCH v2] x86/mm: resize user_pcid_flush_mask for PTI / broadcast TLB flush combination

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Message-ID: <5c756dce3d009470a0db0fe5a48aa0bd40be220e.camel@surriel.com>
Date: Sun, 18 May 2025 12:22:17 -0400
From: Rik van Riel <riel@...riel.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>, Andy Lutomirski
 <luto@...nel.org>,  Peter Zijlstra <peterz@...radead.org>, Ingo Molnar
 <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 	x86@...nel.org,
 linux-kernel@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH v2] x86/mm: resize user_pcid_flush_mask for PTI /
 broadcast TLB flush combination

On Sun, 2025-05-18 at 08:25 +0200, Ingo Molnar wrote:
> 
> * Rik van Riel <riel@...riel.com> wrote:
> 
> > But it is perfectly happy with getting the address of the first
> > long 
> > in that array, which works for both array size 1 and array size 32.
> 
> Yeah. Testing is still a question: does this boot on a system with
> PCID 
> && INVLPGB features, with PTI force-enabled ("pti=on" boot option)?

This version runs, and no signs of corruption with
last_global_asid up over a few hundred due to various
programs running and exiting. 

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