linux-kernel - Re: [PATCH v4 05/12] x86/mm: add INVLPGB support code

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Message-ID: <12ab86daa5c9fde4be692410fd477e97970a3688.camel@surriel.com>
Date: Mon, 13 Jan 2025 20:33:07 -0500
From: Rik van Riel <riel@...riel.com>
To: Jann Horn <jannh@...gle.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
Subject: Re: [PATCH v4 05/12] x86/mm: add INVLPGB support code

On Mon, 2025-01-13 at 18:24 +0100, Jann Horn wrote:
> On Sun, Jan 12, 2025 at 4:55 PM Rik van Riel <riel@...riel.com>
> wrote:
> > +/* Wait for INVLPGB originated by this CPU to complete. */
> > +static inline void tlbsync(void)
> > +{
> > +       asm volatile("tlbsync");
> > +}
> 
> If possible, it might be a good idea to add a cant_migrate()
> assertion
> in here, though I'm not sure if that works in terms of include
> hierarchy.
> 

Nice idea. It just builds without any compiler
issues, so I've included that for the next version.

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