From patchwork Wed Apr 22 09:57:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 227117 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=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT 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 4B18DC55186 for ; Wed, 22 Apr 2020 10:48:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2669C20780 for ; Wed, 22 Apr 2020 10:48:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587552523; bh=PB4GcZ126GmyWWayUQIsGkLrexLF2d6Uee3Qe8PvmyI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=chvOWJ0EVgHx7w7dlFRELnSrPtIDwCPKjRHWFmADtoYNEYGg+urkG1XewhkZoShAo a0gLo9xHTAZQBvJecsLCVCUXGayX//RZLBZwbnCE3ogiGSb7rbqVnDHU05kRSnGsWB LNFxEHdRg+vvz82HNXCL9wbYBNve22QjCRe56E/c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729509AbgDVKOU (ORCPT ); Wed, 22 Apr 2020 06:14:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:48710 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729499AbgDVKOS (ORCPT ); Wed, 22 Apr 2020 06:14:18 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5106520575; Wed, 22 Apr 2020 10:14:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587550457; bh=PB4GcZ126GmyWWayUQIsGkLrexLF2d6Uee3Qe8PvmyI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UpRGE5BC7EG1eLPtrZgSag9IhEFhV0osuAuATj0kd7FNvpbXSNOnyKjd0bjM25K2U iaAJeLUn8dRAc/6pbCQP4uUFwv3Q+w+7CXABGJOs5IDYXVPpKJ2tTgUPjlxI03tukz GXCmj7N/7qmoJQiPNJmtifA7nSVpL79lWsFK5V+M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tianyu Lan , Michael Kelley , Wei Liu , Sasha Levin Subject: [PATCH 4.19 25/64] x86/Hyper-V: Report crash data in die() when panic_on_oops is set Date: Wed, 22 Apr 2020 11:57:09 +0200 Message-Id: <20200422095017.502624781@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200422095008.799686511@linuxfoundation.org> References: <20200422095008.799686511@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Tianyu Lan [ Upstream commit f3a99e761efa616028b255b4de58e9b5b87c5545 ] When oops happens with panic_on_oops unset, the oops thread is killed by die() and system continues to run. In such case, guest should not report crash register data to host since system still runs. Check panic_on_oops and return directly in hyperv_report_panic() when the function is called in the die() and panic_on_oops is unset. Fix it. Fixes: 7ed4325a44ea ("Drivers: hv: vmbus: Make panic reporting to be more useful") Signed-off-by: Tianyu Lan Reviewed-by: Michael Kelley Link: https://lore.kernel.org/r/20200406155331.2105-7-Tianyu.Lan@microsoft.com Signed-off-by: Wei Liu Signed-off-by: Sasha Levin --- arch/x86/hyperv/hv_init.c | 6 +++++- arch/x86/include/asm/mshyperv.h | 2 +- drivers/hv/vmbus_drv.c | 5 +++-- 3 files changed, 9 insertions(+), 4 deletions(-) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 8a9cff1f129dc..1663ad84778ba 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #ifdef CONFIG_HYPERV_TSCPAGE @@ -427,11 +428,14 @@ void hyperv_cleanup(void) } EXPORT_SYMBOL_GPL(hyperv_cleanup); -void hyperv_report_panic(struct pt_regs *regs, long err) +void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die) { static bool panic_reported; u64 guest_id; + if (in_die && !panic_on_oops) + return; + /* * We prefer to report panic on 'die' chain as we have proper * registers to report, but if we miss it (e.g. on BUG()) we need diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index f37704497d8f3..5b58a6cf487ff 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -338,7 +338,7 @@ static inline int cpumask_to_vpset(struct hv_vpset *vpset, void __init hyperv_init(void); void hyperv_setup_mmu_ops(void); -void hyperv_report_panic(struct pt_regs *regs, long err); +void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die); void hyperv_report_panic_msg(phys_addr_t pa, size_t size); bool hv_is_hyperv_initialized(void); void hyperv_cleanup(void); diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index eacfe7933c4dd..fb22b72fd535a 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -43,6 +43,7 @@ #include #include #include +#include #include "hyperv_vmbus.h" struct vmbus_dynid { @@ -85,7 +86,7 @@ static int hyperv_panic_event(struct notifier_block *nb, unsigned long val, if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE && hyperv_report_reg()) { regs = current_pt_regs(); - hyperv_report_panic(regs, val); + hyperv_report_panic(regs, val, false); } return NOTIFY_DONE; } @@ -102,7 +103,7 @@ static int hyperv_die_event(struct notifier_block *nb, unsigned long val, * the notification here. */ if (hyperv_report_reg()) - hyperv_report_panic(regs, val); + hyperv_report_panic(regs, val, true); return NOTIFY_DONE; }