linux-kernel - Re: [PATCH v11 00/12] AMD broadcast TLB invalidation

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Message-ID: <CA+i-1C2nPV9Q=baw8NJN8rt7TuTcCaA+JpdJMpVNsOqjLk3=vQ@mail.gmail.com>
Date: Thu, 13 Feb 2025 19:38:56 +0100
From: Brendan Jackman <jackmanb@...gle.com>
To: Rik van Riel <riel@...riel.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, bp@...en8.de, 
	peterz@...radead.org, dave.hansen@...ux.intel.com, zhengqi.arch@...edance.com, 
	nadav.amit@...il.com, thomas.lendacky@....com, kernel-team@...a.com, 
	linux-mm@...ck.org, akpm@...ux-foundation.org, jannh@...gle.com, 
	mhklinux@...look.com, andrew.cooper3@...rix.com
Subject: Re: [PATCH v11 00/12] AMD broadcast TLB invalidation

On Thu, 13 Feb 2025 at 19:31, Brendan Jackman <jackmanb@...gle.com> wrote:
>
> On Thu, 13 Feb 2025 at 17:20, Rik van Riel <riel@...riel.com> wrote:
> >
> > Add support for broadcast TLB invalidation using AMD's INVLPGB instruction.
>
> Oh - what if the user sets nopcid. We need to disable invlpgb in that
> case right?
>
> (I assume it could be made to work, but doesn't seem like a case worth
> optimising).

BTW there are still a couple of unresolved threads from previous versions.

KPTI comment:

https://lore.kernel.org/linux-kernel/CA+i-1C2zuctxx6oPVVu0zBJ=Q=Hs73mgrWs5jsp8obARNcUS9g@mail.gmail.com/
and
https://lore.kernel.org/linux-kernel/20250212104239.GF19118@noisy.programming.kicks-ass.net/

Clarify context-switch sync:

https://lore.kernel.org/linux-kernel/CA+i-1C2CcQmrbdv0wLUJFD6m85D7LekejU=VdgMxnqZW=DRPxA@mail.gmail.com/

(there's another mention of it somewhere that I can't find)

Suggestion for WARN_ON_ONCE:

https://lore.kernel.org/linux-kernel/CA+i-1C3-F-VAy_JccwKx_AcD1mXsVcGHGwUFvi_ruAiqusiXZQ@mail.gmail.com/