From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90416C5CFEB for ; Wed, 11 Jul 2018 16:28:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 496FF2083D for ; Wed, 11 Jul 2018 16:28:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="dLkTS7pN" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 496FF2083D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388483AbeGKQd5 (ORCPT ); Wed, 11 Jul 2018 12:33:57 -0400 Received: from mail-io0-f193.google.com ([209.85.223.193]:43831 "EHLO mail-io0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726609AbeGKQd5 (ORCPT ); Wed, 11 Jul 2018 12:33:57 -0400 Received: by mail-io0-f193.google.com with SMTP id y10-v6so9487613ioa.10 for ; Wed, 11 Jul 2018 09:28:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=6mAhl+CODAPJ2AgKAbYGX1tJG5WxvwYIDQl2vaEkf8c=; b=dLkTS7pNQqKfVUKOHYsPJavI7YnvQBOQmSJ97n8wYuYkfxRKEkgvVdiF7XOKTXriuN 2Id0AzwLzabZ0dcicU8OWY6ra+pY4lO3OLuJdVaIb9PTYIaJyZgec7iLjh3fr1oftOBU rH81C1NEFKljnGNDFlM1WLshZGDDztDXgtZCQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=6mAhl+CODAPJ2AgKAbYGX1tJG5WxvwYIDQl2vaEkf8c=; b=NXPZN9kbBlPXQPZ6NskPz7c25kFcSUVfWOnRNxX/N6Ha2L8SMvL4Z9Vherro41ZghJ GEO8CGHY/g+uJUwXVbdUTUSfUqMoV+q7NR4wfVuMEYQt/HYyP1R9YIZLhcyvh+Dd6MET 7/JSCbdfBTMo69P3wSE0iqtzf7VHbKcTNTBZgnvkPu5RlEiwETfuXx4MzwNgkrMaUn7l do45KwfKuvbRm+qJ0p0oO5b1kugpvgLQi2alDM8tb5F1y3VfkTyK5/jz1l3b+hURJW3M qEWgtV4/wQ0hF9Dtgc3m+cZyxl8+u6v2FPvwmKm5EPagb26rxy5bPhpbbF+qh0JB3TMo +T/Q== X-Gm-Message-State: APt69E2yUkW8B/4/1FCWV7y9l0SVTk4cddNuBtGY169DSMPxYV5Mhqs5 HKb1lXW3hiMYFkJ7XS0sf8VaUAkhE+BUu8XXEDI= X-Google-Smtp-Source: AAOMgpfJ2zKeo/i3Jb2Dfwv+dXYW5yVA3jsidYIg5OfoN1DAruVmm+MijffnVRcY3U0gGj6/kUkdBgWCEP3VxRzLhhU= X-Received: by 2002:a02:2b12:: with SMTP id h18-v6mr22214371jaa.10.1531326530605; Wed, 11 Jul 2018 09:28:50 -0700 (PDT) MIME-Version: 1.0 References: <1531308586-29340-1-git-send-email-joro@8bytes.org> In-Reply-To: <1531308586-29340-1-git-send-email-joro@8bytes.org> From: Linus Torvalds Date: Wed, 11 Jul 2018 09:28:39 -0700 Message-ID: Subject: Re: [PATCH 00/39 v7] PTI support for x86-32 To: Joerg Roedel Cc: Thomas Gleixner , Ingo Molnar , Peter Anvin , "the arch/x86 maintainers" , Linux Kernel Mailing List , linux-mm , Andrew Lutomirski , Dave Hansen , Josh Poimboeuf , =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= , Peter Zijlstra , Borislav Petkov , Jiri Kosina , Boris Ostrovsky , Brian Gerst , David Laight , Denys Vlasenko , Eduardo Valentin , Greg Kroah-Hartman , Will Deacon , "Liguori, Anthony" , Daniel Gruss , Hugh Dickins , Kees Cook , Andrea Arcangeli , Waiman Long , Pavel Machek , "David H . Gutteridge" , Joerg Roedel Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 11, 2018 at 4:30 AM Joerg Roedel wrote: > > I did the load-testing again with 'perf top', the ldt_gdt > self-test and a kernel-compile running in a loop again. So none of the patches looked scary to me, but then, neither did earlier versions. It's the testing that worries me most. Pretty much no developers run 32-bit any more, and I'd be most worried about the odd interactions that might be hw-specific. Some crazy EFI mapping setup or the similar odd case that simply requires a particular configuration or setup. But I guess those issues will never be found until we just spring this all on the unsuspecting public. Linus