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=-6.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 4A4DFC433DF for ; Sat, 10 Oct 2020 08:45:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E1C24207C4 for ; Sat, 10 Oct 2020 08:45:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="kAtqE8rx" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726461AbgJJIou (ORCPT ); Sat, 10 Oct 2020 04:44:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52248 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725978AbgJJIna (ORCPT ); Sat, 10 Oct 2020 04:43:30 -0400 Received: from mail-pg1-x544.google.com (mail-pg1-x544.google.com [IPv6:2607:f8b0:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 39EE4C0613D8 for ; Sat, 10 Oct 2020 01:42:30 -0700 (PDT) Received: by mail-pg1-x544.google.com with SMTP id 7so9250874pgm.11 for ; Sat, 10 Oct 2020 01:42:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=zw+ntGIK+4G6XVO6IheBenaFyAxg8/PgVbW1KLkzc+g=; b=kAtqE8rxqEFhx6RrWlcuYkfe6Bh0jHnKIrwKy2wmLEIl1Y11CymQMKtimhisiLX9Y1 6rQrP4ewAKDtAMTQi2avVroyk1d5KznraeHD/bNI8FZ7y5go7owfkecVaiWTjS3c86eR N+PK6iBu5FdswX1z8HdMgiCDAf/oq6tXOe1t2mSKBqty+jS7obGfs2ehdpnB4p/FTkwQ g/KxAqt8lxf89zUWkrK+yHXyT+QTP+UhazOlTlTqpVtZVH+YobkvdCPa2aAJa9qWYQjO NWOmIjs3RfbzNuQgzaLLCBrOBDwQYh0jrBXapK5nAeD0u9hhQTClEpEvnja2vBk1qPbf vaaQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=zw+ntGIK+4G6XVO6IheBenaFyAxg8/PgVbW1KLkzc+g=; b=Lv2KXin8Fyd6MBD1yXdHH9SKQu1qlMqXZ3QRcE64KwV2wprG/9cRHkCptnYv8MiLlV UV5zuwesmm3S7gwvZlbvPWZ8ic5orZbu6C6sek09KYyHA2oTRvfXHtVQHoIfUP45HlR3 gb55Bc65eodQfOx1Rb9uIKj5rCFLC2AXuuQhlhijT224sRHEC7TbAI43prSigQqKI4YL YgKdRxGdgSaU9q8J3dPNMPdRwiwDMW9KcSWPJ6QmDxyDPIyjiSGwaBlC2KN+YRocqa4B PBSs+HcVzoH9QvwiscXUrmbbGhzv/p6TPpsfOsG99RdVJH9ABPi79taazc9jL4r7AbaW kNyQ== X-Gm-Message-State: AOAM533/gNMpXbv4wZq6iQn08aDygPls2C3QysURstsI77d8Hxs+quAU xIFOOQv+OTuAE7u6O2hs4ck= X-Google-Smtp-Source: ABdhPJxDcmRk8nc9rFqq+RJS2T+icQFjDpnSSl5t3qm+Cs7vhazdx88hVrv5WqBSDRdTjR5ln+S2aQ== X-Received: by 2002:a63:165b:: with SMTP id 27mr6239261pgw.197.1602319348617; Sat, 10 Oct 2020 01:42:28 -0700 (PDT) Received: from ?IPv6:2601:647:4700:9b2:25eb:9460:8682:b3b5? ([2601:647:4700:9b2:25eb:9460:8682:b3b5]) by smtp.gmail.com with ESMTPSA id b6sm14363017pjq.42.2020.10.10.01.42.27 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 10 Oct 2020 01:42:28 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) Subject: Re: [kvm-unit-tests PATCH] x86: VMX: Add a VMX-preemption timer expiration test From: Nadav Amit In-Reply-To: <20200508203938.88508-1-jmattson@google.com> Date: Sat, 10 Oct 2020 01:42:26 -0700 Cc: kvm@vger.kernel.org, Paolo Bonzini , Peter Shier Content-Transfer-Encoding: quoted-printable Message-Id: References: <20200508203938.88508-1-jmattson@google.com> To: Jim Mattson X-Mailer: Apple Mail (2.3608.120.23.2.4) Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org >=20 > On May 8, 2020, at 1:39 PM, Jim Mattson wrote: >=20 > When the VMX-preemption timer is activated, code executing in VMX > non-root operation should never be able to record a TSC value beyond > the deadline imposed by adding the scaled VMX-preemption timer value > to the first TSC value observed by the guest after VM-entry. >=20 > Signed-off-by: Jim Mattson > Reviewed-by: Peter Shier This test failed on my bare-metal machine (Broadwell): Test suite: vmx_preemption_timer_expiry_test FAIL: Last stored guest TSC (44435478250637180) < TSC deadline = (44435478250419552) Any hints why, perhaps based on the motivation for the test?