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=-18.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_IN_DEF_DKIM_WL autolearn=unavailable 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 2C70FC433B4 for ; Wed, 19 May 2021 05:30:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 085A261355 for ; Wed, 19 May 2021 05:30:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239481AbhESFcB (ORCPT ); Wed, 19 May 2021 01:32:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59496 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239066AbhESFbz (ORCPT ); Wed, 19 May 2021 01:31:55 -0400 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4053AC06175F for ; Tue, 18 May 2021 22:30:35 -0700 (PDT) Received: by mail-pl1-x62b.google.com with SMTP id s20so6351598plr.13 for ; Tue, 18 May 2021 22:30:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=CgnXGca0Sj0Q6Z+AnySOLxHV/ucQfpgB5ZEXSsAu5Q8=; b=bRC23/Mld4+4uILCqIPUnHY2jHl3CZi3T7iD0gSmsxCdlKa05Ao/B/UgkGOeuoQmhp UOnTn2IOAPVgXeV/H+pczFQeylg5HouR+ULoN6jgZbwfNVMRVqdMcUZP5E9QE7gSwRzn 8CsDFHcCPl7Y/Ntt8X9xFJxRDFYZQIP72O7S4Qa1xJC33t60nkpdulyRsOT+vhZO+WWa r85DllRRgfaoVrB3lppKzk65uLwvKBRSRaiimxmxOSiN5lyKU0u3PKJhfjBvweEKYt+V Nhq7jkRTaaUO/De4e1eAxoM5GMcK40CiK0mjpRX7n+jSsEgF2OJYLR9N8gW5liz5qSR9 o98g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=CgnXGca0Sj0Q6Z+AnySOLxHV/ucQfpgB5ZEXSsAu5Q8=; b=TIsuRvWAH1fCSyfZUV833DK/NA2K3ALYZO6RBjRfD90iLm6Zn3vx++D6zj6ZG2jqoP 1/y7WLoOZDBGpSA6mWJ6HBcmR/0xDXUfEeK65Hkd/Jc4le88m1y8RiISDEuL/obwAxC6 UBL6i0p05/zBraYC6NwrJSMBIuuQaY0SQOj6tQF3LaV7ki2t7CU/5Jp5EMZfozpEFh/L bvXR4X8yEngXJ6xDT8ulhKpCCSEb78vyI3PYH2aA0+A8xvNxRHKaiFxq2cIePn9mJwJh WlylwGd5uQ6+zk1TYit93vtEBAwGa4xK5ELcgc3jMeceiWo+lINnOm6DQz4Xn5jAZbhS 0X5Q== X-Gm-Message-State: AOAM533rTOZWAgzM1PRcQYNpbxENElixtgt+nqDvM73tlpZR+81wA8TG k5EvcUkBo7y3JqAzCYNIb1dnryz7poZfdStaCh07zw== X-Google-Smtp-Source: ABdhPJxhtMPkfKErvsjTiGyK8JketB+r2z2FH+qqg9oXaQ6PmUAru4AZI1A9bFUDH0sBGcYWdWJLONefMzBmQySvzhQ= X-Received: by 2002:a17:902:f20c:b029:f0:af3d:c5d8 with SMTP id m12-20020a170902f20cb02900f0af3dc5d8mr8741262plc.23.1621402234545; Tue, 18 May 2021 22:30:34 -0700 (PDT) MIME-Version: 1.0 References: <20210424004645.3950558-1-seanjc@google.com> <20210424004645.3950558-2-seanjc@google.com> In-Reply-To: <20210424004645.3950558-2-seanjc@google.com> From: Reiji Watanabe Date: Tue, 18 May 2021 22:30:18 -0700 Message-ID: Subject: Re: [PATCH 01/43] KVM: nVMX: Set LDTR to its architecturally defined value on nested VM-Exit To: Sean Christopherson Cc: Paolo Bonzini , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Apr 23, 2021 at 5:47 PM Sean Christopherson wrote: > > Set L1's LDTR on VM-Exit per the Intel SDM: > > The host-state area does not contain a selector field for LDTR. LDTR is > established as follows on all VM exits: the selector is cleared to > 0000H, the segment is marked unusable and is otherwise undefined > (although the base address is always canonical). > > This is likely a benign bug since the LDTR is unusable, as it means the > L1 VMM is conditioned to reload its LDTR in order to function properly on > bare metal. > > Fixes: 4704d0befb07 ("KVM: nVMX: Exiting from L2 to L1") > Signed-off-by: Sean Christopherson Reviewed-by: Reiji Watanabe