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=-8.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS autolearn=ham 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 E091BC433B4 for ; Fri, 14 May 2021 19:39:31 +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 886536145A for ; Fri, 14 May 2021 19:39:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 886536145A 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]:37398 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lhdek-0006Um-Kx for qemu-devel@archiver.kernel.org; Fri, 14 May 2021 15:39:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60126) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lhdav-00073m-Nr for qemu-devel@nongnu.org; Fri, 14 May 2021 15:35:33 -0400 Received: from indium.canonical.com ([91.189.90.7]:44768) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lhdas-0000dG-NS for qemu-devel@nongnu.org; Fri, 14 May 2021 15:35:33 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.93 #5 (Debian)) id 1lhdar-0003Kf-95 for ; Fri, 14 May 2021 19:35:29 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 3BCB12E8192 for ; Fri, 14 May 2021 19:35:29 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Fri, 14 May 2021 19:28:44 -0000 From: Thomas Huth <1912107@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Expired; importance=Undecided; assignee=None; X-Launchpad-Bug-Tags: feature-request linux-user X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: artoria2e5 th-huth X-Launchpad-Bug-Reporter: Mingye Wang (artoria2e5) X-Launchpad-Bug-Modifier: Thomas Huth (th-huth) References: <161090862069.30717.14713485848942415507.malonedeb@chaenomeles.canonical.com> Message-Id: <162102052431.7511.5702613657445277287.malone@gac.canonical.com> Subject: [Bug 1912107] Re: Option to constrain linux-user exec() to emulated CPU only 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="5321c3f40fa4d4b847f4e47fb766e7b95ed5036c"; Instance="production" X-Launchpad-Hash: 29816d97c4e568f892759fde5df2a97488f4f454 Received-SPF: none 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=0.248, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, 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 1912107 <1912107@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an automated cleanup. This bug report has been moved to QEMU's new bug tracker on gitlab.com and thus gets marked as 'expired' now. Please continue with the discussion here: https://gitlab.com/qemu-project/qemu/-/issues/306 ** Changed in: qemu Status: New =3D> Expired ** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #306 https://gitlab.com/qemu-project/qemu/-/issues/306 -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1912107 Title: Option to constrain linux-user exec() to emulated CPU only Status in QEMU: Expired Bug description: When trying to reproduce a bug someone reported on an actual AMD K10[1], = =E2=80=8BI tried to directly throw `qemu_x86-64 -cpu = =E2=80=8Bphenom path/to/wrongly-labelled-instruction-set/gcc 1.c` at the = problem, but failed to get an "illegal instruction" as expected. A quick in= vestigation reveals that the error is actually caused by one of gcc's child= processess, and that the said process is being ran directly on the host. A= similar problem happens with trying to call stuff with /usr/bin/env. =E2=80=8B[1]: https://github.com/Homebrew/brew/issues/1034 Since both the host and the guest are x86_64, I deemed binfmt inapplicable to my case. I believe that QEMU should offer a way to modify exec() and other spawning syscalls so that execution remains on an emulated CPU in such a case. Call it an extra layer of binfmt, if you must. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1912107/+subscriptions