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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B17F5C19F2D for ; Sat, 6 Aug 2022 20:31:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234213AbiHFUbv (ORCPT ); Sat, 6 Aug 2022 16:31:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231364AbiHFUbs (ORCPT ); Sat, 6 Aug 2022 16:31:48 -0400 Received: from mail-ej1-x62c.google.com (mail-ej1-x62c.google.com [IPv6:2a00:1450:4864:20::62c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 657B6631A for ; Sat, 6 Aug 2022 13:31:47 -0700 (PDT) Received: by mail-ej1-x62c.google.com with SMTP id kb8so10367019ejc.4 for ; Sat, 06 Aug 2022 13:31:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc; bh=h6TeEL+zwRVR56oMOZRDcH12YoM3CR31tNWgWBUf5pA=; b=Z5Tr7NC6JgsKkE9XiNOKBzUM2nRxwEmA5LsMsrsD3MCosdCfDER+TMZteu3pHKDnRA b+oSRQwWMeplsoY1nMc/pYY5OoqRolBlVuMg4VWi0RHXg22MpgJ7hKeZoHyu9boeNa5H gyecJly17bbyHXvhbk3CXSBAhPTS+R1x2H4fU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc; bh=h6TeEL+zwRVR56oMOZRDcH12YoM3CR31tNWgWBUf5pA=; b=sTA41dpOlROgruxbmpZulyyGH/8nR2AcMkqu3fAxYSzf0RMJhahvqZ3AnQAWg6g1rw d7eBdjrggYSBPW0FAkzHFiBXIRNasB0doo3ikYyhePHfQVxCnOHgradtDdlcuLCiZLpP nGzEz9ZbJQztsAsNsh3hZNSiUYqpcGoFXW9F2jc+m1gQb8kRzP0hDLVYM5cEhO8q3Af+ lljn+6wuhgbUt1zxyps9hQ9eCtWDvzBHui8sLzdHVtnJRQh9MWJ1+5vFx46ZRcW282JJ /7tyBjl2z6V/ykE9NJUDBssbOZ8hz9csQtvwDwYf045RTzl5tz5JxmIhvs440yubog7O GVVw== X-Gm-Message-State: ACgBeo2B+sNHat4c6CPBvwga7kc8wkTH+7O7TJZeGAs5fegKYJozqwLx cyoHsAj4A+PrWasTaKsu6irAzlIBUOaaA6K9 X-Google-Smtp-Source: AA6agR4w/oRUeIqBbOO5NEfy+qlqlCoSpvj+L0sT3EDcPMSILP1Bb6K+7Jpxd3lKjqTIyiYGodHhjQ== X-Received: by 2002:a17:906:cc0c:b0:730:8bbb:69ac with SMTP id ml12-20020a170906cc0c00b007308bbb69acmr9160414ejb.392.1659817905670; Sat, 06 Aug 2022 13:31:45 -0700 (PDT) Received: from mail-wr1-f51.google.com (mail-wr1-f51.google.com. [209.85.221.51]) by smtp.gmail.com with ESMTPSA id b22-20020a1709064d5600b0073075122af2sm3028943ejv.225.2022.08.06.13.31.45 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 06 Aug 2022 13:31:45 -0700 (PDT) Received: by mail-wr1-f51.google.com with SMTP id v3so6808681wrp.0 for ; Sat, 06 Aug 2022 13:31:44 -0700 (PDT) X-Received: by 2002:a5d:56cf:0:b0:21e:ce64:afe7 with SMTP id m15-20020a5d56cf000000b0021ece64afe7mr7357268wrw.281.1659817904667; Sat, 06 Aug 2022 13:31:44 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Linus Torvalds Date: Sat, 6 Aug 2022 13:31:28 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [git pull] IOMMU Updates for Linux v5.20 To: Joerg Roedel , Robin Murphy , Christoph Hellwig , John Garry Cc: Will Deacon , linux-kernel@vger.kernel.org, iommu@lists.linux.dev Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Aug 6, 2022 at 12:39 PM Linus Torvalds wrote: > > If it is, it will be reverted as hopelessly optimistic. Indeed. I should just have verified with the kernel command line, but I started bisecting when it wasn't entirely obvious what was going on, so I just finished it. Commit 4bf7fda4dce2 ("iommu/dma: Add config for PCI SAC address trick") is reverted in my tree. You can try again in a decade or so, but at least on x86-64, that config option is basically a "stop modern machines from working", and I don't want to have that even as an option. If somebody wants some debug output to figure out which device it is that cares, send me a patch, but we're not trying this thing as-is again. Linus