From patchwork Tue Mar 7 02:39:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13162681 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 146E1C6FA99 for ; Tue, 7 Mar 2023 03:05:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230266AbjCGDFd (ORCPT ); Mon, 6 Mar 2023 22:05:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42838 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230222AbjCGDFZ (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 DF39B74335; Mon, 6 Mar 2023 19:05:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1678158319; x=1709694319; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=n5Ln656oJnJmTILrzTkjrWNEu25opZektOWvxvWKy2E=; b=MYk0z84/HgtYlx4WOUKXH+jbwrikWGWcC3MqpXTy7JSPJBqRs/FUgjNq hyP1c6C1lCUrXMVmmDb7LmEY3SbvSoWTlLSoJcR9xiwMaOnapfY3Z343t t91yld+NqNAm8zBszN0BR/94WQpJDHbsqAcEnIlYSMnyQHzX/sjxsKnHW DX4yOA6I7icVLa7rK731M9Lv5jf39cbMrBkjoAGCF6UZDXxjUw6FlSnq7 puDSdM17OAUHCPSUTIl3d00l3qJHjnAJie4KscyjyusKF0rHjCUCNzEBU 4nsdkOr73fjJtWsvqUYOg4I1yTr+tN4XXAOlmWD+Z3lD/L0Q2qcgI+jnT A==; X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="338072350" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="338072350" 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 19:05:12 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10641"; a="676409724" X-IronPort-AV: E=Sophos;i="5.98,238,1673942400"; d="scan'208";a="676409724" 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 05/34] x86/traps: export external_interrupt() for VMX IRQ reinjection Date: Mon, 6 Mar 2023 18:39:17 -0800 Message-Id: <20230307023946.14516-6-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 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 *regs, void f (struct pt_regs *regs) typedef DECLARE_SYSTEM_INTERRUPT_HANDLER((*system_interrupt_handler)); +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, unsigned int vector) return 0; } +#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 */