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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 5FE96C07E9A for ; Wed, 14 Jul 2021 13:57:20 +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 7FA7761374 for ; Wed, 14 Jul 2021 13:57:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7FA7761374 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bugs.launchpad.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:48216 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m3fO2-0006ra-J5 for qemu-devel@archiver.kernel.org; Wed, 14 Jul 2021 09:57:18 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34126) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m3fMr-0005TJ-RL for qemu-devel@nongnu.org; Wed, 14 Jul 2021 09:56:07 -0400 Received: from indium.canonical.com ([91.189.90.7]:46694) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1m3fMp-0005ov-F2 for qemu-devel@nongnu.org; Wed, 14 Jul 2021 09:56:05 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.93 #5 (Debian)) id 1m3fMj-0007Qg-77 for ; Wed, 14 Jul 2021 13:55:57 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 350F42E817D for ; Wed, 14 Jul 2021 13:55:57 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Wed, 14 Jul 2021 13:45:39 -0000 From: Peter Maydell <1906536@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=New; importance=Undecided; assignee=None; X-Launchpad-Bug-Tags: arm linux-user X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: ajbennee alecop janitor philmd pmaydell th-huth X-Launchpad-Bug-Reporter: Alex Coplan (alecop) X-Launchpad-Bug-Modifier: Peter Maydell (pmaydell) References: <160692480491.27592.13493676422712150173.malonedeb@chaenomeles.canonical.com> Message-Id: <162627033910.29844.1610699384486289607.malone@gac.canonical.com> Subject: [Bug 1906536] Re: Unable to set SVE VL to 1024 bits or above since 7b6a2198 X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="48411ad9fd448ca55fc57f9555fc375624a85324"; Instance="production" X-Launchpad-Hash: b6089bf2d8180cbb33c65fa9683d6c7c0769372a Received-SPF: pass client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-Spam_score_int: -65 X-Spam_score: -6.6 X-Spam_bar: ------ X-Spam_report: (-6.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=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 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1906536 <1906536@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Whoops, this shouldn't have got expired. ** Changed in: qemu Status: Expired =3D> New --=20 You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1906536 Title: Unable to set SVE VL to 1024 bits or above since 7b6a2198 Status in QEMU: New Bug description: Prior to 7b6a2198e71794c851f39ac7a92d39692c786820, the QEMU option sve-max-vq could be used to set the vector length of the implementation. This is useful (among other reasons) for testing software compiled with a fixed SVE vector length. Since this commit, the vector length is capped at 512 bits. To reproduce the issue: $ cat rdvl.s .global _start _start: rdvl x0, #1 asr x0, x0, #4 mov x8, #93 // exit svc #0 $ aarch64-linux-gnu-as -march=3Darmv8.2-a+sve rdvl.s -o rdvl.o $ aarch64-linux-gnu-ld rdvl.o $ for vl in 1 2 4 8 16; do ../build-qemu/aarch64-linux-user/qemu-aarch64 = -cpu max,sve-max-vq=3D$vl a.out; echo $?; done 1 2 4 4 4 For a QEMU built prior to the above revision, we get the output: 1 2 4 8 16 as expected. It seems that either the old behavior should be restored, or there should be an option to force a higher vector length? To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1906536/+subscriptions