From patchwork Mon Apr 10 08:14:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13206163 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 0E29FC77B77 for ; Mon, 10 Apr 2023 08:41:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229742AbjDJIlM (ORCPT ); Mon, 10 Apr 2023 04:41:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49342 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229694AbjDJIlF (ORCPT ); Mon, 10 Apr 2023 04:41:05 -0400 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8C5733AAD; Mon, 10 Apr 2023 01:41:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1681116064; x=1712652064; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=BCbf0Vj9ZyZPtbZTSgD/ohjbP2Y9NHqyEC0o1Sj/JgM=; b=GLi1NB3HM7JxG3th5VQR+LrMVv+XTvpezi97IdF+STW+5oIarJ+0Ete5 mESESepyiE9n4UpY614rl7mrAtAMyhx/X+Qi1RNMm4KKuI4vuAaZ80iCs mpXPP34sWvQSUDqE+VvVNEkg33K4ouEzUiyUeMqrSONZPr7o36mI7m74o ulqjqYIqtM5g/LEre5/cAmETYN3CSIHv4LKWj9/08iOXG21IH0tbhpRub /eqSayLY57IiSBF26+Gj5PYG33SfuQWcUT1kbmKHqS623/5mI4G4XuQra BBDjgwju1B/OY+7nyCZGp0R5mjSS7qwyYpYj3yKnkqud69XDSyLZ7AQiA w==; X-IronPort-AV: E=McAfee;i="6600,9927,10675"; a="342077913" X-IronPort-AV: E=Sophos;i="5.98,333,1673942400"; d="scan'208";a="342077913" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Apr 2023 01:41:02 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10675"; a="799436254" X-IronPort-AV: E=Sophos;i="5.98,333,1673942400"; d="scan'208";a="799436254" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga002.fm.intel.com with ESMTP; 10 Apr 2023 01:41:02 -0700 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, jiangshanlai@gmail.com, shan.kang@intel.com Subject: [PATCH v8 05/33] x86/traps: add external_interrupt() to dispatch external interrupts Date: Mon, 10 Apr 2023 01:14:10 -0700 Message-Id: <20230410081438.1750-6-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230410081438.1750-1-xin3.li@intel.com> References: <20230410081438.1750-1-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_handlers table, otherwise to dispatch_common_interrupt(). Signed-off-by: H. Peter Anvin (Intel) Co-developed-by: Xin Li Tested-by: Shan Kang Signed-off-by: Xin Li --- Changes since v5: * Initialize system_interrupt_handlers with dispatch_table_spurious_interrupt() instead of NULL to get rid of a branch (Peter Zijlstra). --- arch/x86/kernel/traps.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 12072e2af4a6..f86cd233b00b 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -1511,6 +1511,32 @@ static system_interrupt_handler system_interrupt_handlers[NR_SYSTEM_VECTORS] = { #undef SYSV +/* + * 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 = regs->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) + system_interrupt_handlers[sysvec](regs); + else + dispatch_common_interrupt(regs, vector); + + return 0; +} + #endif /* CONFIG_X86_64 */ void __init install_system_interrupt_handler(unsigned int n, const void *asm_addr, const void *addr)