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 F2DAFC433EF for ; Fri, 17 Dec 2021 20:13:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237469AbhLQUNg (ORCPT ); Fri, 17 Dec 2021 15:13:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39216 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236895AbhLQUNf (ORCPT ); Fri, 17 Dec 2021 15:13:35 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5B981C061574; Fri, 17 Dec 2021 12:13:35 -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=rO7RzCyQ25y8W0tD9udgOx6gMcOcJ8S5dWrL7uER9A0=; b=vuOIV7DWYiq3K5PyRlTDFKtsDU VzpNXD53BaMdcvHliHEychch9LxxkjsGx2VHchXkx1+ShQk3hpfkZcmJAZc/zphtGM2vNsrjjnzaK Pc0kPRhRXETYIveZIsVVM3SVjTwyQBXTHdlGjmA4HaSNWEpdR0+SmKRdWrM2MaNiccYEix5W4CtRu AdjwjFPAj3OYmVGoZt5K9fcuHEZgnS51H5ayuFNMZXPDdEDpUOjgc4Z01ndlNtOfGKPmjMRMYCnWj HhCO4Q3MOvoc2oIORbVPaVtPsqAmrV+dSR1036bUYBuqNM1jOukRd1FsZIwmQfTGey4LiVcDKwlAD IqQvJ24A==; 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 1myJbU-00CFYm-F5; Fri, 17 Dec 2021 20:13:20 +0000 Message-ID: <41e63d89f1b2debc0280f243d7c8c3212e9499ee.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 20:13:16 +0000 In-Reply-To: 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="=-CmbcRVgBfN/eer0a7pYM" 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 --=-CmbcRVgBfN/eer0a7pYM Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2021-12-17 at 13:46 -0600, Tom Lendacky wrote: > There's no WARN or PANIC, just a reset. I can look to try and capture som= e > KVM trace data if that would help. If so, let me know what events you'd > like captured. Could start with just kvm_run_exit? Reason 8 would be KVM_EXIT_SHUTDOWN and would potentially indicate a triple fault. Failing that, I'd want to start littering the real mode code with outputting 'a' 'b' 'c' etc. to the serial port and see if the offending CPU is really in the trampoline somewhere when something goes wrong. I can knock up an example patch to do that (not tonight) but this would be somewhat easier if I could find a machine I can reproduce on. Sadly I only seem to have access to Milan *guests* without nested virt, not bare metal. Got a machine I can log in to? =20 --=-CmbcRVgBfN/eer0a7pYM Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q cXuzkOpibq2YurVStHAiGqAOMGMXhcVGqPuGhcVcVzVUjsvEzAV9Po9K2rpZ52FE4rDkpDK1pBK+ uOAyOkgIg/cD8Kugav5tyapydeWMZRJQH1vMQ6OVT24CyAn2yXm2NgTQMS1mpzStP2ioPtTnszIQ 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