From patchwork Mon Nov 9 09:50:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Juergen Gross X-Patchwork-Id: 11890829 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 88FB26A2 for ; Mon, 9 Nov 2020 09:51:18 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 46D23204FD for ; Mon, 9 Nov 2020 09:51:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="ZMdQFefC" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 46D23204FD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.22268.48535 (Exim 4.92) (envelope-from ) id 1kc3oh-000342-KF; Mon, 09 Nov 2020 09:50:27 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 22268.48535; Mon, 09 Nov 2020 09:50:27 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kc3oh-00033v-Gt; Mon, 09 Nov 2020 09:50:27 +0000 Received: by outflank-mailman (input) for mailman id 22268; Mon, 09 Nov 2020 09:50:26 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kc3of-00032y-Ve for xen-devel@lists.xenproject.org; Mon, 09 Nov 2020 09:50:26 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id abd59ebd-efb6-4d95-a147-c7bb5d752dbe; Mon, 09 Nov 2020 09:50:24 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id E0472AC65; Mon, 9 Nov 2020 09:50:23 +0000 (UTC) Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kc3of-00032y-Ve for xen-devel@lists.xenproject.org; Mon, 09 Nov 2020 09:50:26 +0000 X-Inumbo-ID: abd59ebd-efb6-4d95-a147-c7bb5d752dbe Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id abd59ebd-efb6-4d95-a147-c7bb5d752dbe; Mon, 09 Nov 2020 09:50:24 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1604915424; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GLBR9EmjHCFkPapKcP0kRX3wmjiDirIrvyn/L7SIsBk=; b=ZMdQFefCGQLexNWbgcUpKI//N649BSfQt+iiuKYf3V80m/cdf+zyipd2CdYWR5MhtGzZJ8 TObwY6Pcy9GRx6gO/Ha7bhJA/+fHa35BErQ/FoBRcq8AIVelWvsclOFaUwxLYcPoYonyY+ 1li17/vxGJ+D5DTiosZo/BOzOaGW+cw= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id E0472AC65; Mon, 9 Nov 2020 09:50:23 +0000 (UTC) From: Juergen Gross To: xen-devel@lists.xenproject.org Cc: Juergen Gross , Jan Beulich , Andrew Cooper , =?utf-8?q?Roger_Pau_Monn=C3=A9?= , Wei Liu Subject: [PATCH v4 3/3] xen/x86: issue pci_serr error message via NMI continuation Date: Mon, 9 Nov 2020 10:50:21 +0100 Message-Id: <20201109095021.9897-4-jgross@suse.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201109095021.9897-1-jgross@suse.com> References: <20201109095021.9897-1-jgross@suse.com> MIME-Version: 1.0 Instead of using a softirq pci_serr_error() can use NMI continuation for issuing an error message. Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich --- V4: - rework to less generic approach --- xen/arch/x86/traps.c | 21 +++++++++++++++------ xen/include/asm-x86/softirq.h | 5 ++--- 2 files changed, 17 insertions(+), 9 deletions(-) diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c index 7cb7d7e09c..6aeccef32d 100644 --- a/xen/arch/x86/traps.c +++ b/xen/arch/x86/traps.c @@ -1660,10 +1660,18 @@ void do_general_protection(struct cpu_user_regs *regs) panic("GENERAL PROTECTION FAULT\n[error_code=%04x]\n", regs->error_code); } -static void pci_serr_softirq(void) +static bool pci_serr_cont; + +static bool pci_serr_nmicont(void) { + if ( !pci_serr_cont ) + return false; + + pci_serr_cont = false; printk("\n\nNMI - PCI system error (SERR)\n"); outb(inb(0x61) & 0x0b, 0x61); /* re-enable the PCI SERR error line. */ + + return true; } static void nmi_hwdom_report(unsigned int reason_idx) @@ -1688,9 +1696,9 @@ static void pci_serr_error(const struct cpu_user_regs *regs) nmi_hwdom_report(_XEN_NMIREASON_pci_serr); /* fallthrough */ case 'i': /* 'ignore' */ - /* Would like to print a diagnostic here but can't call printk() - from NMI context -- raise a softirq instead. */ - raise_softirq(PCI_SERR_SOFTIRQ); + /* Issue error message in NMI continuation. */ + pci_serr_cont = true; + trigger_nmi_continuation(); break; default: /* 'fatal' */ console_force_unlock(); @@ -1808,6 +1816,9 @@ bool nmi_check_continuation(void) if ( nmi_oprofile_send_virq() ) ret = true; + if ( pci_serr_nmicont() ) + ret = true; + return ret; } @@ -2154,8 +2165,6 @@ void __init trap_init(void) percpu_traps_init(); cpu_init(); - - open_softirq(PCI_SERR_SOFTIRQ, pci_serr_softirq); } void activate_debugregs(const struct vcpu *curr) diff --git a/xen/include/asm-x86/softirq.h b/xen/include/asm-x86/softirq.h index 0b7a77f11f..415ee866c7 100644 --- a/xen/include/asm-x86/softirq.h +++ b/xen/include/asm-x86/softirq.h @@ -6,9 +6,8 @@ #define VCPU_KICK_SOFTIRQ (NR_COMMON_SOFTIRQS + 2) #define MACHINE_CHECK_SOFTIRQ (NR_COMMON_SOFTIRQS + 3) -#define PCI_SERR_SOFTIRQ (NR_COMMON_SOFTIRQS + 4) -#define HVM_DPCI_SOFTIRQ (NR_COMMON_SOFTIRQS + 5) -#define NR_ARCH_SOFTIRQS 6 +#define HVM_DPCI_SOFTIRQ (NR_COMMON_SOFTIRQS + 4) +#define NR_ARCH_SOFTIRQS 5 bool arch_skip_send_event_check(unsigned int cpu);