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 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 4A2EFC2D0A3 for ; Sun, 1 Nov 2020 21:21:42 +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 BA018207C3 for ; Sun, 1 Nov 2020 21:21:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BA018207C3 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]:33854 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kZKnE-000270-Tj for qemu-devel@archiver.kernel.org; Sun, 01 Nov 2020 16:21:40 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:32874) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kZKXj-0003Y4-QK for qemu-devel@nongnu.org; Sun, 01 Nov 2020 16:05:39 -0500 Received: from indium.canonical.com ([91.189.90.7]:57214) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kZKXh-0005if-AN for qemu-devel@nongnu.org; Sun, 01 Nov 2020 16:05:39 -0500 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1kZKXf-0005yp-Bx for ; Sun, 01 Nov 2020 21:05:35 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 4B4842E8131 for ; Sun, 1 Nov 2020 21:05:35 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Sun, 01 Nov 2020 20:57:25 -0000 From: Luis <1902451@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: cpuid X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: qubasa X-Launchpad-Bug-Reporter: Luis (qubasa) X-Launchpad-Bug-Modifier: Luis (qubasa) References: <160426338728.14730.2439588061093712843.malonedeb@wampee.canonical.com> Message-Id: <160426424638.30466.11447725847272436753.launchpad@gac.canonical.com> Subject: [Bug 1902451] Re: incorrect cpuid feature detection 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="96ff31b88b65a0d0ea73b89333fe7c4a2669d8fb"; Instance="production" X-Launchpad-Hash: 67e307a84fe9f048439e60759e5ec4777e9014bb 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 = 2020/11/01 15:50:33 X-ACL-Warn: Detected OS = Linux 3.11 and newer [fuzzy] X-Spam_score_int: -66 X-Spam_score: -6.7 X-Spam_bar: ------ X-Spam_report: (-6.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, 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=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 1902451 <1902451@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" ** Tags added: cpuid -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1902451 Title: incorrect cpuid feature detection Status in QEMU: New Bug description: Hello, I am currently developing a x64 kernel and I wanted to check through cpuid if some features are available in the guest. When I try to enable cpu features like vmcb_clean or constant_tsc qemu is saying that my host doesn't support the requested features. However cat /proc/cpuinfo tells a different story: model name: AMD Ryzen 5 3500U flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pa= t pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdt= scp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf = pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave a= vx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalign= sse 3dnowprefetch osvw skinit wdt tce topoext perfctr_core perfctr_nb bpext= perfctr_llc mwaitx cpb hw_pstate sme pti ssbd sev ibpb vmmcall fsgsbase bm= i1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1= xsaves clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale= vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave= _vmload vgif overflow_recov succor smca I also checked it myself by running cpuid and check the bits as in the AMD Manual. Everything checks out but qemu still fails. QEMU version: QEMU emulator version 4.2.0 $ qemu-system-x86_64 -cpu host,+vmcb_clean,enforce -enable-kvm -drive for= mat=3Draw,file=3Dtarget/x86_64-os/debug/bootimage-my_kernel.bin -serial std= io -display none qemu-system-x86_64: warning: host doesn't support requested feature: CPUI= D.8000000AH:EDX.vmcb-clean [bit 5] qemu-system-x86_64: Host doesn't support requested features or $ qemu-system-x86_64 -cpu host,+constant_tsc,enforce -enable-kvm -drive f= ormat=3Draw,file=3Dtarget/x86_64-os/debug/bootimage-my_kernel.bin -serial s= tdio -display none qemu-system-x86_64: Property '.constant_tsc' not found To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1902451/+subscriptions