From patchwork Fri Jan 6 08:55:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13091149 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 469DAC61DB3 for ; Fri, 6 Jan 2023 09:21:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232921AbjAFJUv (ORCPT ); Fri, 6 Jan 2023 04:20:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43902 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232926AbjAFJUR (ORCPT ); Fri, 6 Jan 2023 04:20:17 -0500 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 294976B5B4; Fri, 6 Jan 2023 01:20:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1672996817; x=1704532817; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=DCWXhKrktyBv8aibjttu3M7wa+RfYSum0IIVl7wgtzY=; b=MF95Ip/PsAGSx4tXW3kUwus4xpPRWD7jQj1WQAvdwoDaDwAwBx8QwqSy j6dlp+mS1L/EIwbRJGnxaILr0xPSFI1A9Sn7PZL63p4E1kK9T3b+PtMHg X9M7E/uWL+F1XLsCsudG//7CV81DY5VY+SFDVD7u+LkEtNnUxgHMS9i3h IKWMG3LRjWALI0+Xr5KgTEHg7sF7feAKcL97tKMjH/ex5rstLfsMHLkte Vv//u7vI+FpTZ9gh2QfD//kxXq3Kfp+b3WGeDnpNlcv6tixrLxoq4gqWU JumMrnQg5kD5LrEbwuqcAEz6TOvvh/hrRWoChxxUsQT/TTsaFcEbvJcUj A==; X-IronPort-AV: E=McAfee;i="6500,9779,10581"; a="322511409" X-IronPort-AV: E=Sophos;i="5.96,304,1665471600"; d="scan'208";a="322511409" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Jan 2023 01:20:12 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10581"; a="719139352" X-IronPort-AV: E=Sophos;i="5.96,304,1665471600"; d="scan'208";a="719139352" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga008.fm.intel.com with ESMTP; 06 Jan 2023 01:20:12 -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: [RFC PATCH v2 04/32] x86/traps: add external_interrupt() to dispatch external interrupts Date: Fri, 6 Jan 2023 00:55:49 -0800 Message-Id: <20230106085617.17248-5-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230106085617.17248-1-xin3.li@intel.com> References: <20230106085617.17248-1-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 Signed-off-by: Xin Li --- arch/x86/kernel/traps.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 2b8530235e47..c35dd2b4d146 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -1499,6 +1499,43 @@ void __init install_system_interrupt_handler(unsigned int n, const void *asm_add alloc_intr_gate(n, asm_addr); } +#ifndef CONFIG_X86_LOCAL_APIC +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 */