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 4FAB3C19F2D for ; Sat, 6 Aug 2022 20:29:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232361AbiHFU3G (ORCPT ); Sat, 6 Aug 2022 16:29:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56054 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231646AbiHFU3E (ORCPT ); Sat, 6 Aug 2022 16:29:04 -0400 Received: from theia.8bytes.org (8bytes.org [81.169.241.247]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 242D99FE8 for ; Sat, 6 Aug 2022 13:29:03 -0700 (PDT) Received: by theia.8bytes.org (Postfix, from userid 1000) id E46AE641; Sat, 6 Aug 2022 22:29:00 +0200 (CEST) Date: Sat, 6 Aug 2022 22:28:55 +0200 From: Joerg Roedel To: Linus Torvalds Cc: Will Deacon , linux-kernel@vger.kernel.org, iommu@lists.linux.dev Subject: Re: [git pull] IOMMU Updates for Linux v5.20 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Aug 06, 2022 at 12:39:54PM -0700, Linus Torvalds wrote: > I'm currently bisecting a boot failure on my desktop, and it's gone > into the iommu code. > > I'm assuming it's the 64-bit thing, but I'll bisect further to make sure. > > If it is, it will be reverted as hopelessly optimistic. A faster way to track down whether this change causes the boot failures on your machine is to boot with iommu.forcedac=0 to disable the new behavior and see if the issue goes away. Please let me know if I can help with anything. Regards, Joerg