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=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 3810CC433FE for ; Mon, 13 Sep 2021 16:33:14 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F3D67604E9 for ; Mon, 13 Sep 2021 16:33:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org F3D67604E9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:47820 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mPotN-0001Mr-6g for qemu-devel@archiver.kernel.org; Mon, 13 Sep 2021 12:33:13 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38014) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mPoow-0003AX-NA for qemu-devel@nongnu.org; Mon, 13 Sep 2021 12:28:40 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:54375) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mPoot-0002cZ-9N for qemu-devel@nongnu.org; Mon, 13 Sep 2021 12:28:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1631550513; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=Ds0Z2P4e8RHgyoM/MnoufqARYnoJig4iojR3MbftSi4=; b=aiNefuQ20vpMaBuBkhJfA6EFuSWISey/rrvqksVJSumF7AUPI4C/R+6HfakJb85zZMI4em O4zLZjJjFfi9zQck9LCqxPC0RP5rQT/UYz8hSpK3N4sAuIUJj6E7nkRU/+yFAbB0UOD+ar jEMjexAXc6JtfXa8+PDryty6yzdVfnc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-38-EavYwZzGP9a0nCfSxH7FDQ-1; Mon, 13 Sep 2021 12:28:30 -0400 X-MC-Unique: EavYwZzGP9a0nCfSxH7FDQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 145251006AA1; Mon, 13 Sep 2021 16:28:29 +0000 (UTC) Received: from localhost (unknown [10.39.192.185]) by smtp.corp.redhat.com (Postfix) with ESMTP id B8A73781E8; Mon, 13 Sep 2021 16:28:28 +0000 (UTC) Date: Mon, 13 Sep 2021 17:28:27 +0100 From: "Richard W.M. Jones" To: Richard Henderson Subject: Re: [PATCH] tcg/arm: Reduce vector alignment requirement for NEON Message-ID: <20210913162827.GH26415@redhat.com> References: <20210912174925.200132-1-richard.henderson@linaro.org> <20210913110727.GF26415@redhat.com> MIME-Version: 1.0 In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=rjones@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=170.10.133.124; envelope-from=rjones@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.398, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, berrange@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, Sep 13, 2021 at 09:19:22AM -0700, Richard Henderson wrote: > On 9/13/21 4:07 AM, Richard W.M. Jones wrote: > >>[ 0.000000] Linux version 5.14.0-60.fc36.armv7hl (mockbuild@buildvm-a32-12.iad2.fedoraproject.org) (gcc (GCC) 11.2.1 20210728 (Red Hat 11.2.1-1), GNU ld version 2.37-9.fc36) #1 SMP Mon Aug 30 14:08:34 UTC 2021 > >> > >>I thought about parameterizing this patch further, but I can't think of > >>another ISA that would be affected. (i686 clumsily changed its abi 20 > >>years ago to avoid faulting on vector spills; other isas so far have > >>allowed vectors to be unaligned.) > > > >Is it possible this change could have caused a more serious > >regression? > > I don't think so... > > >Now when I try to boot the Fedora kernel using TCG on > >armv7hl I can't even get to the point where it detects virtio-scsi > >devices. > > > >Full log is here (go down to the bottom and work backwards): > > > > https://kojipkgs.fedoraproject.org//work/tasks/7337/75597337/build.log > > I downloaded the 5.14.0-60 kernel from above, and I can reproduce > the original error, and I see that it's fixed afterward. Thanks for checking that. I did spend much of today attempting to get an armv7 guest installed on my RPi so I could reproduce this more reliably, but eventually gave up because of a variety of other problems (one apparently in qemu: https://bugzilla.redhat.com/1633328) > I'll have a look at this new build log in a moment... > > > r~ Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into KVM guests. http://libguestfs.org/virt-v2v