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=-0.7 required=3.0 tests=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 BC7E8C433E0 for ; Thu, 18 Jun 2020 16:12:31 +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 91B5E20776 for ; Thu, 18 Jun 2020 16:12:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 91B5E20776 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]:33670 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jlx9S-0008Ld-Ta for qemu-devel@archiver.kernel.org; Thu, 18 Jun 2020 12:12:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44218) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jlx7w-000714-Of for qemu-devel@nongnu.org; Thu, 18 Jun 2020 12:10:56 -0400 Received: from indium.canonical.com ([91.189.90.7]:33592) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jlx7t-0006w2-CK for qemu-devel@nongnu.org; Thu, 18 Jun 2020 12:10:56 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1jlx7s-0008U3-9G for ; Thu, 18 Jun 2020 16:10:52 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 446252E80BA for ; Thu, 18 Jun 2020 16:10:52 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Thu, 18 Jun 2020 16:04:49 -0000 From: Daniel Berrange <1818075@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-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: berrange pmaydell rcfa ross X-Launchpad-Bug-Reporter: Ross Burton (ross) X-Launchpad-Bug-Modifier: Daniel Berrange (berrange) References: <155136199055.29310.6029801353341134939.malonedeb@chaenomeles.canonical.com> Message-Id: <159249628986.26203.13077132449520479380.malone@gac.canonical.com> Subject: [Bug 1818075] Re: qemu x86 TCG doesn't support AVX insns 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="1cbd0aa39df153c901321817f9b57cf3f232b507"; Instance="production-secrets-lazr.conf" X-Launchpad-Hash: 35fd0b3773f30c389fe69e9ae2b42a4170589f3c Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/18 11:20:43 X-ACL-Warn: Detected OS = Linux 3.11 and newer [fuzzy] X-Spam_score_int: -58 X-Spam_score: -5.9 X-Spam_bar: ----- X-Spam_report: (-5.9 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=_AUTOLEARN 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 1818075 <1818075@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" QEMU, like most open source projects, relies on contributors who have motivation, skills and available time to work on implementing particular features. They naturally tend to focus on features that result in the greatest benefit to their own use cases. Thus simply declaring that an open source project, must support something won't magically make it happen. IOW, the lack of coverage of newer x86 instructions is largely a reflection of the relative priorities of the current pool of contributors and where/what they feel are the best places/features to spend their time on. If any person does want to work on improving x86 TCG though, the project would happily receive patches, and existing contributors can offer guidance & advice along the way to help get to a successful outcome. -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1818075 Title: qemu x86 TCG doesn't support AVX insns Status in QEMU: New Bug description: I'm trying to execute code that has been built with -march=3Dskylake -mtune=3Dgeneric -mavx2 under qemu-user x86-64 with -cpu Skylake-Client. However this code just hangs at 100% CPU. Adding input tracing shows that it is likely hanging when dealing with an AVX instruction: warning: TCG doesn't support requested feature: CPUID.01H:ECX.fma [bit 12] warning: TCG doesn't support requested feature: CPUID.01H:ECX.pcid [bit 1= 7] warning: TCG doesn't support requested feature: CPUID.01H:ECX.x2apic [bit= 21] warning: TCG doesn't support requested feature: CPUID.01H:ECX.tsc-deadlin= e [bit 24] warning: TCG doesn't support requested feature: CPUID.01H:ECX.avx [bit 28] warning: TCG doesn't support requested feature: CPUID.01H:ECX.f16c [bit 2= 9] warning: TCG doesn't support requested feature: CPUID.01H:ECX.rdrand [bit= 30] warning: TCG doesn't support requested feature: CPUID.07H:EBX.hle [bit 4] warning: TCG doesn't support requested feature: CPUID.07H:EBX.avx2 [bit 5] warning: TCG doesn't support requested feature: CPUID.07H:EBX.invpcid [bi= t 10] warning: TCG doesn't support requested feature: CPUID.07H:EBX.rtm [bit 11] warning: TCG doesn't support requested feature: CPUID.07H:EBX.rdseed [bit= 18] warning: TCG doesn't support requested feature: CPUID.80000001H:ECX.3dnow= prefetch [bit 8] warning: TCG doesn't support requested feature: CPUID.0DH:EAX.xsavec [bit= 1] IN: 0x4000b4ef3b: c5 fb 5c ca vsubsd %xmm2, %xmm0, %xmm1 0x4000b4ef3f: c4 e1 fb 2c d1 vcvttsd2si %xmm1, %rdx 0x4000b4ef44: 4c 31 e2 xorq %r12, %rdx 0x4000b4ef47: 48 85 d2 testq %rdx, %rdx 0x4000b4ef4a: 79 9e jns 0x4000b4eeea [ hangs ] Attaching a gdb produces this stacktrace: (gdb) bt #0 canonicalize (status=3D0x55a20ff67a88, parm=3D0x55a20bb807e0 , part=3D...) at /data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-= 3.1.0/fpu/softfloat.c:350 #1 float64_unpack_canonical (s=3D0x55a20ff67a88, f=3D0) at /data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-= 3.1.0/fpu/softfloat.c:547 #2 float64_sub (a=3D0, b=3D4890909195324358656, status=3D0x55a20ff67a88) at /data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-= 3.1.0/fpu/softfloat.c:776 #3 0x000055a20baa1949 in helper_subsd (env=3D, d=3D0x55a2= 0ff67ad8, s=3D) at /data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-= 3.1.0/target/i386/ops_sse.h:623 #4 0x000055a20cfcfea8 in static_code_gen_buffer () #5 0x000055a20ba3f764 in cpu_tb_exec (itb=3D, cpu=3D0x55a= 20cea2180 ) at /data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-= 3.1.0/accel/tcg/cpu-exec.c:171 #6 cpu_loop_exec_tb (tb_exit=3D, last_tb=3D, tb=3D, cpu=3D0x55a20cea2180 ) at /data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-= 3.1.0/accel/tcg/cpu-exec.c:615 #7 cpu_exec (cpu=3Dcpu@entry=3D0x55a20ff5f4d0) at /data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-= 3.1.0/accel/tcg/cpu-exec.c:725 #8 0x000055a20ba6d728 in cpu_loop (env=3D0x55a20ff67780) at /data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-= 3.1.0/linux-user/x86_64/../i386/cpu_loop.c:93 #9 0x000055a20ba049ff in main (argc=3D, argv=3D0x7ffc5857= 2868, envp=3D) at /data/poky-tmp/master/work/x86_64-linux/qemu-native/3.1.0-r0/qemu-= 3.1.0/linux-user/main.c:819 To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1818075/+subscriptions