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

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Message-ID: <CAG48ez0aqUznBPoS96yj+5MLbwhXGGnKSf6OEwc1t_tp=9ieXg@mail.gmail.com>
Date: Mon, 13 Jan 2025 18:24:54 +0100
From: Jann Horn <jannh@...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
Subject: Re: [PATCH v4 05/12] x86/mm: add INVLPGB support code

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.