linux-kernel - Re: [PATCH] x86/mm: Disable INVLPGB when PTI is enabled

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Message-ID: <ce520c1e28475703c71ab817de790823e29cda7e.camel@surriel.com>
Date: Tue, 10 Jun 2025 20:43:01 -0400
From: Rik van Riel <riel@...riel.com>
To: Dave Hansen <dave.hansen@...ux.intel.com>, linux-kernel@...r.kernel.org
Cc: Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...en8.de>, Ingo
 Molnar <mingo@...nel.org>, Nadav Amit <nadav.amit@...il.com>, Peter
 Zijlstra	 <peterz@...radead.org>, stable@...r.kernel.org
Subject: Re: [PATCH] x86/mm: Disable INVLPGB when PTI is enabled

On Tue, 2025-06-10 at 15:24 -0700, Dave Hansen wrote:
> 
> Disable INVLPGB if PTI is enabled. Avoid overrunning the small
> bitmap.
> 
> Note: this will be fixed up properly by making the bitmap bigger.
> For now, just avoid the mostly theoretical bug.
> 
Does that mean the patch to make the bitmap bigger
is a dependency that needs to be in place before
the RAR code (hoping to send out v4 later this week)
can be merged?

> Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Fixes: 4afeb0ed1753 ("x86/mm: Enable broadcast TLB invalidation for
> multi-threaded processes")

Acked-by: Rik van Riel <riel@...riel.com>

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