From nobody Sat Apr 11 07:03:10 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 4B6A8C7EE3A for ; Thu, 2 Mar 2023 05:51:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229880AbjCBFu7 (ORCPT ); Thu, 2 Mar 2023 00:50:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44476 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229714AbjCBFut (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 DA7771A974; Wed, 1 Mar 2023 21:50:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1677736247; x=1709272247; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=n5Ln656oJnJmTILrzTkjrWNEu25opZektOWvxvWKy2E=; b=DDGxUA2XEVd3Cqm0Nhhf5MqfsXS/gB3fw73sK0yrbbL5YQKkAgWrs8o8 Egc6Ky0vAfj8cTyEr0MCVl1mmmXuRZGjc8h4+kpX3VNh0GJ/g3Hxi2Y4M 7yA1F00ryGF5Ih0vfcoJPR8lrsdKzIEj5llIpbaDSPORSA/W4AF6l3ADD 1So99IuZMk546CsdFx4h7WenDpHkFUurWgNMDcRA3ltn9iygXRiUxbw0W X958xNPEri+ovDMFASxRStJY1ycfPPz57GQkhZLMkCyp5BW9HYvINTRNE +OpdjuUatqr6bmCI7BayAp46nksdcKFNqxOcdvc2NnkhCeij7JY1CCEys Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10636"; a="420887052" X-IronPort-AV: E=Sophos;i="5.98,226,1673942400"; d="scan'208";a="420887052" 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 21:50:46 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10636"; a="920530884" X-IronPort-AV: E=Sophos;i="5.98,226,1673942400"; d="scan'208";a="920530884" 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 05/34] x86/traps: export external_interrupt() for VMX IRQ reinjection Date: Wed, 1 Mar 2023 21:24:42 -0800 Message-Id: <20230302052511.1918-6-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" To eliminate dispatching IRQ through the IDT, export external_interrupt() for VMX IRQ reinjection. Tested-by: Shan Kang Signed-off-by: Xin Li --- arch/x86/include/asm/traps.h | 2 ++ arch/x86/kernel/traps.c | 14 ++++++++++++++ 2 files changed, 16 insertions(+) diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h index 46f5e4e2a346..da4c21ed68b4 100644 --- a/arch/x86/include/asm/traps.h +++ b/arch/x86/include/asm/traps.h @@ -56,4 +56,6 @@ void __noreturn handle_stack_overflow(struct pt_regs *reg= s, void f (struct pt_regs *regs) typedef DECLARE_SYSTEM_INTERRUPT_HANDLER((*system_interrupt_handler)); =20 +int external_interrupt(struct pt_regs *regs, unsigned int vector); + #endif /* _ASM_X86_TRAPS_H */ diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 31ad645be2fb..cebba1f49e19 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -1540,6 +1540,20 @@ int external_interrupt(struct pt_regs *regs, unsigne= d int vector) return 0; } =20 +#if IS_ENABLED(CONFIG_KVM_INTEL) +/* + * KVM VMX reinjects IRQ on its current stack, it's a sync call + * thus the values in the pt_regs structure are not used in + * executing IRQ handlers, except cs.RPL and flags.IF, which + * are both always 0 in the VMX IRQ reinjection context. + * + * However, the pt_regs structure is sometimes used in stack + * dump, e.g., show_regs(). So let the caller, i.e., KVM VMX + * decide how to initialize the input pt_regs structure. + */ +EXPORT_SYMBOL_GPL(external_interrupt); +#endif + void __init trap_init(void) { /* Init cpu_entry_area before IST entries are set up */ --=20 2.34.1