Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4630DC43217 for ; Fri, 17 Dec 2021 19:26:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240635AbhLQT0y (ORCPT ); Fri, 17 Dec 2021 14:26:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240570AbhLQT0t (ORCPT ); Fri, 17 Dec 2021 14:26:49 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9DEA6C061574; Fri, 17 Dec 2021 11:26:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=stCqq8yX/632+84Y+BNzC4Ct1x0b+NuqV5Ro8nzoTfc=; b=OJeCaAGO9dluZjWXDhFA1yLPxO XAptppp2NQR4cpEmFvSXOlAL98yxUAiyP9NLmKt2sl6kUutsPbXvFzqFj50UNmSzgKgJYqJRtUUSN PKpZrGwfjtSJ4QkCTnMbQXaXjdBvH2gGaoDB8kJK4IOVqDLj4MN4vw2N/2heE5hpG8semPJM8A3sl W0LKmztmwWU6HC7qpyOOgDodDyTwZ17JkaPG1mSgcY+D1JP65YgfvEaDpNxKH3Wc9kkz0X/TLp1QK zqg6V7TwARpafABpyBDR103LCwGR6zTZcNzWS+9cEHvFyBE4P6jxuGhDyaU/wJ2Hk52Ch/TlPn2p0 sji11G3w==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.ant.amazon.com) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1myIsF-00C7PC-Ch; Fri, 17 Dec 2021 19:26:35 +0000 Message-ID: <62714ae555a42dfccc992925691c44024d7d0e3a.camel@infradead.org> Subject: Re: [PATCH v3 0/9] Parallel CPU bringup for x86_64 From: David Woodhouse To: Tom Lendacky , Thomas Gleixner Cc: Ingo Molnar , Borislav Petkov , Dave Hansen , "x86@kernel.org" , "H . Peter Anvin" , Paolo Bonzini , "Paul E . McKenney" , "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , "rcu@vger.kernel.org" , "mimoja@mimoja.de" , "hewenliang4@huawei.com" , "hushiyuan@huawei.com" , "luolongjun@huawei.com" , "hejingxian@huawei.com" Date: Fri, 17 Dec 2021 19:26:31 +0000 In-Reply-To: <2bfb13ed5d565ab09bd794f69a6ef2b1b75e507a.camel@infradead.org> References: <20211215145633.5238-1-dwmw2@infradead.org> <761c1552-0ca0-403b-3461-8426198180d0@amd.com> <721484e0fa719e99f9b8f13e67de05033dd7cc86.camel@infradead.org> <1401c5a1-c8a2-cca1-e548-cab143f59d8f@amd.com> <2bfb13ed5d565ab09bd794f69a6ef2b1b75e507a.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-fTXVE2NNHO+dxZLXmpaq" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-fTXVE2NNHO+dxZLXmpaq Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2021-12-17 at 19:11 +0000, David Woodhouse wrote: > I note that one is in native_write_msr() though. I wonder what it's > writing? CPU Reset (CPU 0) RAX=3D0000000000000000 RBX=3D0000000000000202 RCX=3D0000000000000828 RDX=3D= 0000000000000000 RSI=3D0000000000000000 RDI=3D0000000000000828 RBP=3D0000000000000000 RSP=3D= ffffc90000023ce0 R8 =3D0000000000000000 R9 =3Dffffc90000023b60 R10=3D0000000000000001 R11=3D= 0000000000000001 R12=3D000000000000069a R13=3D0000000000000005 R14=3D000000000000001c R15=3D= 0000000000000001 RIP=3Dffffffff810705c6 RFL=3D00000206 [-----P-] CPL=3D0 II=3D0 A20=3D1 SMM= =3D0 HLT=3D0 It's writing zero (%rax/%rsi) to MSR 0x828 (%rcx/%rdi) which is the X2APIC's APIC_ESR. Can you reproduce this without the guest being in X2APIC mode? 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