From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.alien8.de (mail.alien8.de [65.109.113.108]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 260DF44C641 for ; Fri, 31 Jul 2026 18:33:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=65.109.113.108 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785522795; cv=none; b=n6XVZcNAC3K11Zf6H0PIyDpjAyOkwjTV8niw5cKtayx+R/YQLMTUVZ2qCuCztvwIUJ1TlX0UT4ym4WQgx/s5l0UVeQL/OE+lUei0iY5a6E0ckI7TSR6TbVUs2yGTa1n3HTjXzf7/4WdBUAitODh48O/M6IwE+PvhuW8wvCzcRME= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785522795; c=relaxed/simple; bh=o7A+4zBjpEmBsKm4UMvoGISMs0SbdTui/mOrEkhR56o=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=L9XgqXL9sLIXS9m0WXV0UV3N7I5qAYwRAsP1IV3DkcUemP5imVont1pNN+zdKCxRhQv1uXXP5SBP5XHCLHtrWYj1yPy3TSB0CUso5Ffb4V/rurQpFXAYO6s5fd3/tw/s/EUiXBZldaWOdpyxwzfzzvZJDb+4u7QMiE/Ygxfhw0o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=alien8.de; spf=pass smtp.mailfrom=alien8.de; dkim=pass (4096-bit key) header.d=alien8.de header.i=@alien8.de header.b=MRMvHZLN; arc=none smtp.client-ip=65.109.113.108 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=alien8.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=alien8.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (4096-bit key) header.d=alien8.de header.i=@alien8.de header.b="MRMvHZLN" Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTP id BE8A440E02B7; Fri, 31 Jul 2026 18:33:10 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at mail.alien8.de Authentication-Results: mail.alien8.de (amavisd-new); dkim=pass (4096-bit key) header.d=alien8.de Received: from mail.alien8.de ([127.0.0.1]) by localhost (mail.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id Tf7l1lLObzzx; Fri, 31 Jul 2026 18:33:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=alien8; t=1785522780; bh=8T4Na1ZzPKdAT7tjnQg1XCOIRoFDY6IstEh/E7XpS8A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=MRMvHZLNVyPP55JDtbFXGTJSc8gUsgNUgwbZKWgyiKotEnVnw/TGNTnY/kMt0h60x m8PYgsMBVTZYx586RJkobkQQwsbilT0+D4RgTlcZNVCMr0YHmabMquEwKg2YnoBoZT 672GrvvudA23VrDcT/ir9ocbJjZ5oJtorMkmR5fxZnbRTcaAVnk3qGybi90nGSaFnj tvHQ230019KwhmLTpoip+m4lEypZUJ4OLw9q6llnOKq5CKCuJqGUmnuXGa7qwZEgre KyowzxLr8E9U6pYqqn9+ntXK7L2LWYtzJss65DVE5SuSJzW8fOLL9s2wmfvZyWQCJP pNyC931cmR1GLlMT6/O5nVqd4kVRsadhAe/Y8jwu8XQ5TYp8yNbWYpRfGVrEsheawJ J5lgtcS6byf2KbvR6Q0LdhH/xSbJxdd9aWk2bSOMY09sHxtIb9obEn1UMQlwzyprBb VRCpS+FNVpgGK9DkjSioW7wzvdws9irhVm/OUdQPiKPuWf9+ONqBYCxkIl66TwNLIl HAtDrxtxQuEzIRMCrDOTfTZE+UO+dVkefqBh5zVHigR/CQde/x6RqOb1384Kwt3juK xNEs9j6hFNlcQcb7iMWgWo2mruYfmJPdD9U12n/uJD/U3p3UK9s0VZ0cZ6sqF+LH+4 JXldpJef3iiGamLvF0wzwK+w= Received: from stx.tnic (unknown [IPv6:2600:1700:38ca:c00::1b]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 3BA4B40E00B8; Fri, 31 Jul 2026 18:32:51 +0000 (UTC) Date: Fri, 31 Jul 2026 11:32:48 -0700 From: Borislav Petkov To: Peter Zijlstra Cc: Rik van Riel , Dave Hansen , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , x86@kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH] add tlbi=off to disable INVLPGB Message-ID: <20260731183248.GCamzqUC_8xp5yPZqB@fat_crate.local> References: <20260729204341.3eb0b5ea@fangorn> <20260730014412.GEamqsbL46iteL25as@fat_crate.local> <20260730103227.GC751831@noisy.programming.kicks-ass.net> <20260730162318.GAamt6ds0siEVGwWlw@fat_crate.local> <20260730173104.GB776954@noisy.programming.kicks-ass.net> <20260730182439.GCamuW53V0HJHXNRqF@fat_crate.local> <20260731084656.GF776954@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260731084656.GF776954@noisy.programming.kicks-ass.net> On Fri, Jul 31, 2026 at 10:46:56AM +0200, Peter Zijlstra wrote: > There is IPMI and other fancy remote management stuff these days. There > is no reason to suffer hearing loss for entering server rooms anymore > :-) Oh but but, there are folks who really really use hearing protection gear and enter such rooms. I visited one recently. > Didn't we have a case where INVLPGB was disabled due to firmware or > something? I was thinking tlbi=broadcast could be used to force enable > it or something. I don't think you can force-enable it, no matter how much you wanted. :-) > Anyway, if that case don't exist, then yeah. Yeah, let's start minimal. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette