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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 66454C10F29 for ; Tue, 17 Mar 2020 13:25:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3D75C20767 for ; Tue, 17 Mar 2020 13:25:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Lbq7Fwt+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726775AbgCQNZh (ORCPT ); Tue, 17 Mar 2020 09:25:37 -0400 Received: from mail-pl1-f194.google.com ([209.85.214.194]:40803 "EHLO mail-pl1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726740AbgCQNZg (ORCPT ); Tue, 17 Mar 2020 09:25:36 -0400 Received: by mail-pl1-f194.google.com with SMTP id h11so9623257plk.7; Tue, 17 Mar 2020 06:25:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=3AG21iLGGAii1MHxBcHGGH0QVkwsyKzAiPYkrML9p7g=; b=Lbq7Fwt+tOGrVSfiXErQDRtZ4H3+lEhCS2Wgb1xuCVEJKsMKVskojybUATXrwdtHDQ CNsoECvA9rr53BF6kkA7aQURIV8VZsLdavBpy+pNCiSP8cYpEpRxqC59PnOSvnJHks07 Mcim8x8TwXsZYj2PpBXO5/2Y3LefQ8yFnAdcoEbGOQQPhxdaty29tDjRCHhTS5LWSCqa aOmo3P7daS9amDS62Qr817UsSw1P9wj4aADvKIwiiwPAo+5xYVNn36zv6mh83Us4UKjm mQTvSGURlmSK+TCflKoj7mE9Qpf3g7zUxBhnhiiMXNLtC4/HiEbZNsn6uycQccajkmm+ RvYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=3AG21iLGGAii1MHxBcHGGH0QVkwsyKzAiPYkrML9p7g=; b=Ia4YE6x42dCQ5JEe/3uPykJQmSKY6p5bG7DG7m2IR6+M9Bk+MLVK5wjjIRMAm+SP1b 9WXc6PXKqFswxXEUk/2XihD/Jb47xRTiqU9KH8fN0qoc3p3SGnl65/mlP66ynzfuZXe+ 9RwPQGhyl1fNQ64e5Eesxi4BGEogAJvLzzr5RpST2ht+NWgQkRheJtK7R5NmdWfUqifR cHD/8RN9kdZKj6HVzSaafxX0hp3shh6NjLgyYI3kIRjqQJJGgvkDsxkT2d/0Mk9evs+1 LbCD6Y1+8FUQz/IoMcj5NHJ7Vlr43ZRPZbSqWfLtAg+ZaH2+qw0O+1OFt9c+LXm3XOoq 3hmg== X-Gm-Message-State: ANhLgQ00pTreO+xX613Ezgmd+ZDTV0RJGmslR6dmZc4iMaaa8Bu4UF73 VthpQIWzvuh341yQLG7sM0wsqXbhJzA= X-Google-Smtp-Source: ADFU+vt0MPZSFVVsUS6VSUAhIpZpRDceY8i1fHN2ntd7+ZVMvXLPFJEh7gH/DuafpHJfdMGxE/lXFQ== X-Received: by 2002:a17:902:ab98:: with SMTP id f24mr4393525plr.87.1584451533250; Tue, 17 Mar 2020 06:25:33 -0700 (PDT) Received: from localhost.corp.microsoft.com ([167.220.2.210]) by smtp.googlemail.com with ESMTPSA id e30sm2910902pga.6.2020.03.17.06.25.32 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 17 Mar 2020 06:25:32 -0700 (PDT) From: ltykernel@gmail.com X-Google-Original-From: Tianyu.Lan@microsoft.com To: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, liuwe@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org, michael.h.kelley@microsoft.com Cc: Tianyu Lan , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, vkuznets@redhat.com Subject: [PATCH 4/4] x86/Hyper-V: Report crash register data or ksmg before running crash kernel Date: Tue, 17 Mar 2020 06:25:23 -0700 Message-Id: <20200317132523.1508-5-Tianyu.Lan@microsoft.com> X-Mailer: git-send-email 2.14.5 In-Reply-To: <20200317132523.1508-1-Tianyu.Lan@microsoft.com> References: <20200317132523.1508-1-Tianyu.Lan@microsoft.com> Sender: linux-hyperv-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org From: Tianyu Lan Hyper-V expects to get crash register data or kmsg via crash enlightenment when guest crash happens. crash_kexec_post_notifiers is default to be false and crash kernel runs before calling hv panic callback and dumping kmsg. In this case, Hyper-V doesn't get crash register data or kmsg from guest. Set crash_kexec_post _notifiers to be true for Hyper-V VM and fix it. Signed-off-by: Tianyu Lan --- arch/x86/kernel/cpu/mshyperv.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index caa032ce3fe3..5e296a7e6036 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -263,6 +263,16 @@ static void __init ms_hyperv_init_platform(void) cpuid_eax(HYPERV_CPUID_NESTED_FEATURES); } + /* + * Hyper-V expects to get crash register data or kmsg when + * crash enlightment is available and system crashes. Set + * crash_kexec_post_notifiers to be true to make sure that + * calling crash enlightment interface before running kdump + * kernel. + */ + if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) + crash_kexec_post_notifiers = true; + #ifdef CONFIG_X86_LOCAL_APIC if (ms_hyperv.features & HV_X64_ACCESS_FREQUENCY_MSRS && ms_hyperv.misc_features & HV_FEATURE_FREQUENCY_MSRS_AVAILABLE) { -- 2.14.5