From patchwork Tue Dec 20 06:36:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13077531 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 28C33C4332F for ; Tue, 20 Dec 2022 07:01:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233354AbiLTHBv (ORCPT ); Tue, 20 Dec 2022 02:01:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53252 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232678AbiLTHBa (ORCPT ); Tue, 20 Dec 2022 02:01:30 -0500 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F4CC14D2E; Mon, 19 Dec 2022 23:01:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1671519688; x=1703055688; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=b2h40hZlbzAYlSPYHfekdfFFlQufXWZBJiq+lRFxfWo=; b=HrRLsLqEhd0sRfW/H3OVWvOCi8quRwLkvMASsElbRI4DrOpksHhUCkjO WpOwAu9J4/VteZ71fKbQ4ZdsY1TBWHu9Fp+GanBgvCNPhWGNC8wNLZbhR EZaD0yzzhQb4m75w6f7QnQD6WNklg9tFx8YvYXKD5DBhx3+2F58dq6tEr zt/iqsgfy+KDXSGwFi5sMTDC5cim4aaX3RyxPj9f4Fl0BGCjpF8fm/rw7 cdNV2hgoyf3ZmP+l+yp9AcmYNF+QD3DJWCA2gthPRnBhIb61Af6zRCCPX oATmulEOr4V0Zv7hptLLUdaH8Z/mioVjw+V3RvMoX8QIswvRkcN0IQKoC w==; X-IronPort-AV: E=McAfee;i="6500,9779,10566"; a="302971929" X-IronPort-AV: E=Sophos;i="5.96,258,1665471600"; d="scan'208";a="302971929" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Dec 2022 23:01:10 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10566"; a="644326426" X-IronPort-AV: E=Sophos;i="5.96,258,1665471600"; d="scan'208";a="644326426" Received: from unknown (HELO fred..) ([172.25.112.68]) by orsmga007.jf.intel.com with ESMTP; 19 Dec 2022 23:01:09 -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 05/32] x86/traps: add exc_raise_irq() for VMX IRQ reinjection Date: Mon, 19 Dec 2022 22:36:31 -0800 Message-Id: <20221220063658.19271-6-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221220063658.19271-1-xin3.li@intel.com> References: <20221220063658.19271-1-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, add exc_raise_irq(), which calls external_interrupt() for IRQ reinjection. Signed-off-by: Xin Li --- arch/x86/include/asm/traps.h | 2 ++ arch/x86/kernel/traps.c | 18 ++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h index 46f5e4e2a346..366b1675c033 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 exc_raise_irq(struct pt_regs *regs, u32 vector); + #endif /* _ASM_X86_TRAPS_H */ diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index c35dd2b4d146..99386836b02e 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -1536,6 +1536,24 @@ 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. + */ +int exc_raise_irq(struct pt_regs *regs, u32 vector) +{ + return external_interrupt(regs, vector); +} +EXPORT_SYMBOL_GPL(exc_raise_irq); +#endif + void __init trap_init(void) { /* Init cpu_entry_area before IST entries are set up */