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Thu, 12 Nov 2020 13:14:27 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 30214AD35; Thu, 12 Nov 2020 13:14:27 +0000 (UTC) X-Outflank-Mailman: Message body and most headers restored to incoming version 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" X-Inumbo-ID: 1999fd1d-427f-4341-a99f-98b0cbee6c58 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=1605186867; 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=o5mPHjtNvM0yH04ZefCYBX4buH74RoSJz6jycMDPprc=; b=oEpRvoOdLB5fo5jNnw8aZ55Gx118FqotuNyKj1o63IPHzGeRyZ50h08TtRhLR+wld+sa4U oAIoOwFGnaVnUIiQn3V4qkt82GXaKTYtagwaMYDntKAbBTpXNHCiMdVWkRr2HNiCcz5+Lq 6w2nE6GX/UCdUCzhmy+oSN7sOtFiqus= From: Juergen Gross To: xen-devel@lists.xenproject.org Cc: Juergen Gross , Jan Beulich , Andrew Cooper , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Wei Liu Subject: [PATCH v5 3/3] xen/x86: issue pci_serr error message via NMI continuation Date: Thu, 12 Nov 2020 14:14:24 +0100 Message-Id: <20201112131424.9930-4-jgross@suse.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201112131424.9930-1-jgross@suse.com> References: <20201112131424.9930-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) Content-Type: text/plain; charset="utf-8" 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 --- V5: - make PCISERR higher prior than oprofile (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 240fd1b089..0459cee9fb 100644 --- a/xen/arch/x86/traps.c +++ b/xen/arch/x86/traps.c @@ -1661,10 +1661,18 @@ void do_general_protection(struct cpu_user_regs *re= gs) panic("GENERAL PROTECTION FAULT\n[error_code=3D%04x]\n", regs->error_c= ode); } =20 -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 =3D false; printk("\n\nNMI - PCI system error (SERR)\n"); outb(inb(0x61) & 0x0b, 0x61); /* re-enable the PCI SERR error line. */ + + return true; } =20 static void nmi_hwdom_report(unsigned int reason_idx) @@ -1689,9 +1697,9 @@ 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 =3D true; + trigger_nmi_continuation(); break; default: /* 'fatal' */ console_force_unlock(); @@ -1806,6 +1814,9 @@ bool nmi_check_continuation(void) { bool ret =3D false; =20 + if ( pci_serr_nmicont() ) + ret =3D true; + if ( nmi_oprofile_send_virq() ) ret =3D true; =20 @@ -2157,8 +2168,6 @@ void __init trap_init(void) percpu_traps_init(); =20 cpu_init(); - - open_softirq(PCI_SERR_SOFTIRQ, pci_serr_softirq); } =20 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) =20 #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 =20 bool arch_skip_send_event_check(unsigned int cpu); =20 --=20 2.26.2