Received: by 2002:ac0:aa62:0:0:0:0:0 with SMTP id w31-v6csp2597547ima; Mon, 22 Oct 2018 12:27:53 -0700 (PDT) X-Google-Smtp-Source: ACcGV623ulA5j8DWOe/Sxch89TFmpLJwdxe7vgLmryNh+EjjrzokOQESK5J0h5KuWSQxtYF1AoB4 X-Received: by 2002:a17:902:3341:: with SMTP id a59-v6mr45752143plc.138.1540236473194; Mon, 22 Oct 2018 12:27:53 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1540236473; cv=none; d=google.com; s=arc-20160816; b=F0Nb8Cz9rj6kYt5jbTzbzQu4Pu0BuHzMbD7fMvulDVPvuByIAap0yyrO9gw5IGIyyH HOmsgY7G/I3GQILT/4lqxuanI3TWOMI55CG7I0FGPGZnyv+AOpzeAS11wON9gyC95yqH lfvmGH7s7PQAkWamBCno+T9J0tl66mHR75nFSxvie1hiirOzfBVbLeMwKmdBQq9J/mtt /zvZCCNBSQMQhAkB2jnh61WiHeRvVyhjFEzMCcG7t2ORYhrSwRA0GF67YTCjtivXlh37 QjyU/C/Di4IlZ9vy7Zef/F9KzY+HVciRZL+Hx9bGPnYfnBirO+UW5l/kTCHXttd1R+dW YL6w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :organization:references:in-reply-to:message-id:subject:cc:to:from :date; bh=ho6UwiNu6+QaKhPmsaQBFR4NNoavwdoYUKYlKC/rUMo=; b=l6GFBSKEsDUGNqhlRXY1MhIIUp0N2cmg6jOsaQnCWESBQlQuobqrettTT9z57htCgd eEhGf8fBl9jurA0yPLomb21QVAltZA40N0N5eA6mgovyjBZ+WNwcJ3WsUCB3CmzZ8DOf 2v2SN4s4msI7fH8cOFgzeX2hC6fF1hdMSQgjAsEhS/9P/FgVUXp2fhDDwdwoguhBDh1E lPOis7jfjD+C9cjVAxeDUkQ/4nrXR6Cd0Iad7Q8rKdvo3Map5lfhAQBtHUZaPZNMLGpL wSPZrZ/Gg75ehG4VGxLOB9nr91z6aPqheLsfW+x2IsORblvIzvxtFtI7tJ1anYo0Yhvh TZVA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id b20-v6si34930184pgk.360.2018.10.22.12.27.37; Mon, 22 Oct 2018 12:27:53 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728686AbeJWDIO (ORCPT + 99 others); Mon, 22 Oct 2018 23:08:14 -0400 Received: from www.llwyncelyn.cymru ([82.70.14.225]:59776 "EHLO fuzix.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727748AbeJWDIO (ORCPT ); Mon, 22 Oct 2018 23:08:14 -0400 Received: from alans-desktop (82-70-14-226.dsl.in-addr.zen.co.uk [82.70.14.226]) by fuzix.org (8.15.2/8.15.2) with ESMTP id w9MImHuS024110; Mon, 22 Oct 2018 19:48:18 +0100 Date: Mon, 22 Oct 2018 19:48:17 +0100 From: Alan Cox To: Joerg Roedel Cc: Pavel Machek , Meelis Roos , Thomas Gleixner , Linux Kernel list , linux-mm@kvack.org, Andrea Arcangeli , Linus Torvalds Subject: Re: 32-bit PTI with THP = userspace corruption Message-ID: <20181022194817.148796e6@alans-desktop> In-Reply-To: <20181022075642.icowfdg3y5wcam63@suse.de> References: <20180830205527.dmemjwxfbwvkdzk2@suse.de> <20180831070722.wnulbbmillxkw7ke@suse.de> <20180911114927.gikd3uf3otxn2ekq@suse.de> <20180911121128.ikwptix6e4slvpt2@suse.de> <20180918140030.248afa21@alans-desktop> <20181021123745.GA26042@amd> <20181022075642.icowfdg3y5wcam63@suse.de> Organization: Intel Corporation X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 22 Oct 2018 09:56:42 +0200 Joerg Roedel wrote: > On Sun, Oct 21, 2018 at 02:37:45PM +0200, Pavel Machek wrote: > > On Tue 2018-09-18 14:00:30, Alan Cox wrote: > > > There are pretty much no machines that don't support PAE and are still > > > even vaguely able to boot a modern Linux kernel. The oddity is the > > > Pentium-M but most distros shipped a hack to use PAE on the Pentium M > > > anyway as it seems to work fine. > > > > I do have some AMD Geode here, in form of subnotebook. Definitely > > newer then Pentium Ms, but no PAE... > > Are the AMD Geode chips affected by Meltdown? Geode for AMD was just a marketing name. The AMD athlon labelled as 'Geode' will behave like any other Athlon but I've not seen anyone successfully implement Meltdown on the Athlon so it's probably ok. The earlier NatSemi ones are not AFAIK vulnerable to either. The later ones might do Spectre (they have branch prediction which is disabled on the earlier ones) but quite possibly not enough to be attacked usefully - and you can turn it off anyway if you care. And I doubt your subnotebook can usefully run modern Linux since the memory limit on most Geode was about 64MB. Alan