From nobody Sat Apr 11 07:07:03 2026 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 E1089C7EE36 for ; Thu, 2 Mar 2023 05:51:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229901AbjCBFvF (ORCPT ); Thu, 2 Mar 2023 00:51:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44486 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229733AbjCBFut (ORCPT ); Thu, 2 Mar 2023 00:50:49 -0500 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF942149A8; Wed, 1 Mar 2023 21:50:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1677736248; x=1709272248; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=0uFNdDkUqLm94ae1U1jdZV+knFHrk6JmxBSxXFP+9lc=; b=UwF2KvFfHcJTiFByhahOJlnBhnaZCZIwahxEuqlpr5xqKzDPAqkFt4OB abTLQvLSEav16cogCTo7brCSsx9Hh1M71OVGc9JKd2Xbvhxj/vd88mt5/ mtT4KD1ZnmvY8lyL7wL2hFXKikU2sqif0BTGVEccDLs1WSmSVSACl6HMP EJuY5U7bEuECtyagI6SsqLEYM8nmWKXWcylbSHFlQaI0A+iK+J7dKEk4n V6ACxavPYJs9Q+H8yKqgMzGC6odnOnzN/xzMW+w/A2IVVDWrwfjbBSIuD 2+XfeIMqOfeK/OY4EN+SZRk+pUMzsrr6wTo50xgFa/SAs3nTJ1ZM4BCA5 w==; X-IronPort-AV: E=McAfee;i="6500,9779,10636"; a="420887033" X-IronPort-AV: E=Sophos;i="5.98,226,1673942400"; d="scan'208";a="420887033" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Mar 2023 21:50:45 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10636"; a="920530877" X-IronPort-AV: E=Sophos;i="5.98,226,1673942400"; d="scan'208";a="920530877" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga006.fm.intel.com with ESMTP; 01 Mar 2023 21:50:45 -0800 From: Xin Li To: linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, peterz@infradead.org, andrew.cooper3@citrix.com, seanjc@google.com, pbonzini@redhat.com, ravi.v.shankar@intel.com Subject: [PATCH v4 04/34] x86/traps: add external_interrupt() to dispatch external interrupts Date: Wed, 1 Mar 2023 21:24:41 -0800 Message-Id: <20230302052511.1918-5-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230302052511.1918-1-xin3.li@intel.com> References: <20230302052511.1918-1-xin3.li@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: "H. Peter Anvin (Intel)" Add external_interrupt() to dispatch external interrupts to their handlers. If an external interrupt is a system interrupt, dipatch it through system_interrupt_handler_table, otherwise call into dispatch_common_interrupt(). Signed-off-by: H. Peter Anvin (Intel) Co-developed-by: Xin Li Tested-by: Shan Kang Signed-off-by: Xin Li --- arch/x86/kernel/traps.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index c0f7666140da..31ad645be2fb 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -1499,6 +1499,47 @@ void __init install_system_interrupt_handler(unsigne= d int n, const void *asm_add alloc_intr_gate(n, asm_addr); } =20 +#ifndef CONFIG_X86_LOCAL_APIC +/* + * Used when local APIC is not compiled into the kernel, but + * external_interrupt() needs dispatch_spurious_interrupt(). + */ +DEFINE_IDTENTRY_IRQ(spurious_interrupt) +{ + pr_info("Spurious interrupt (vector 0x%x) on CPU#%d, should never happen.= \n", + vector, smp_processor_id()); +} +#endif + +/* + * External interrupt dispatch function. + * + * Until/unless dispatch_common_interrupt() can be taught to deal with the + * special system vectors, split the dispatch. + * + * Note: dispatch_common_interrupt() already deals with IRQ_MOVE_CLEANUP_V= ECTOR. + */ +int external_interrupt(struct pt_regs *regs, unsigned int vector) +{ + unsigned int sysvec =3D vector - FIRST_SYSTEM_VECTOR; + + if (vector < FIRST_EXTERNAL_VECTOR) { + pr_err("invalid external interrupt vector %d\n", vector); + return -EINVAL; + } + + if (sysvec < NR_SYSTEM_VECTORS) { + if (system_interrupt_handlers[sysvec]) + system_interrupt_handlers[sysvec](regs); + else + dispatch_spurious_interrupt(regs, vector); + } else { + dispatch_common_interrupt(regs, vector); + } + + return 0; +} + void __init trap_init(void) { /* Init cpu_entry_area before IST entries are set up */ --=20 2.34.1