From patchwork Tue Mar 7 02:39:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13162680 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 145B2C64EC4 for ; Tue, 7 Mar 2023 03:05:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230257AbjCGDFb (ORCPT ); Mon, 6 Mar 2023 22:05:31 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230218AbjCGDFZ (ORCPT ); Mon, 6 Mar 2023 22:05:25 -0500 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D60B75849D; Mon, 6 Mar 2023 19:05:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1678158318; x=1709694318; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=0uFNdDkUqLm94ae1U1jdZV+knFHrk6JmxBSxXFP+9lc=; b=Y8fQdiJwYH44xBdiFGaDHBjqXoggI062RPNCzzPWrxBfJZUcLC399FGL t5PSecNLTfvIGzDZ8hj+s4/i9c/gBiWuzCHkOMYl6jj3Dfi3qORu1/FUc hRUyzPuDrwChGLsC4vEf0Hm7+aTIOK/KvqdlhoBDHXdcMg4W7weAQogz2 bvyUEgynjGKRidtxG33u+neHBRt2N7H0jkoQ09dOaVpTf8tdkv9dqIOfB Dj/+xUSuGZhZLSVTE+lc6wbDEVlunfgi7DmGJwcPjg/KV97GO3StWVW1w Jkosm1W8WGt03+orTJnrJhv8VapYv8Buzmi6VDrV7SdOMXxI2GZQA6mkj w==; X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="338072341" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="338072341" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Mar 2023 19:05:11 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="676409718" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="676409718" Received: from unknown (HELO fred..) ([172.25.112.68]) by orsmga002.jf.intel.com with ESMTP; 06 Mar 2023 19:05:11 -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 v5 04/34] x86/traps: add external_interrupt() to dispatch external interrupts Date: Mon, 6 Mar 2023 18:39:16 -0800 Message-Id: <20230307023946.14516-5-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230307023946.14516-1-xin3.li@intel.com> References: <20230307023946.14516-1-xin3.li@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org 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(unsigned int n, const void *asm_add alloc_intr_gate(n, asm_addr); } +#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_VECTOR. + */ +int external_interrupt(struct pt_regs *regs, unsigned int vector) +{ + unsigned int sysvec = 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 */