From patchwork Tue Dec 20 06:36:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13077543 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 2FF0CC4332F for ; Tue, 20 Dec 2022 07:02:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233506AbiLTHCl (ORCPT ); Tue, 20 Dec 2022 02:02:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53356 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233240AbiLTHBi (ORCPT ); Tue, 20 Dec 2022 02:01:38 -0500 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 073B215A19; Mon, 19 Dec 2022 23:01:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1671519697; x=1703055697; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=umQlTxKGNKLlev+BqP1ZCZCF7yuytMs0GSGunAXbGS4=; b=QnK6o9uitIBKnBttTN7XFM2Q15edqEEB49EJTmwB88fLoaGEZPzOqxbO EU+dd/AGTnmeSBPbyDmyrWqsH5v9yYBTsW1pOc0ccbIYt46GUKA1MpwTy qLkBx6akv2w/IJZvH1p5Dh0cPRXTYQQ9+gRtAbysJRw99ERBRb34R9NiX V2A/palY2o5GcoPhEfU7+Jo1XEiBxTAZ7sKuTJ0HIow/2nO1AXX19C3Rz oMPG9egcqdPaLA/+1k9//kmt5Etw+/y+xkCPqm7V031X5W0Khe0BDA2SH N0lfwgRcdLYhcDiaoEwOAckp8wEhUAzrjhfuh5hA1crUggobIs21Hol0X g==; X-IronPort-AV: E=McAfee;i="6500,9779,10566"; a="302972051" X-IronPort-AV: E=Sophos;i="5.96,258,1665471600"; d="scan'208";a="302972051" 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 23:01:14 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10566"; a="644326487" X-IronPort-AV: E=Sophos;i="5.96,258,1665471600"; d="scan'208";a="644326487" Received: from unknown (HELO fred..) ([172.25.112.68]) by orsmga007.jf.intel.com with ESMTP; 19 Dec 2022 23:01:14 -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 17/32] x86/fred: add a page fault entry stub for FRED Date: Mon, 19 Dec 2022 22:36:43 -0800 Message-Id: <20221220063658.19271-18-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 From: "H. Peter Anvin (Intel)" Add a page fault entry stub for FRED. On a FRED system, the faulting address (CR2) is passed on the stack, to avoid the problem of transient state. Thus we get the page fault address from the stack instead of CR2. Signed-off-by: H. Peter Anvin (Intel) Signed-off-by: Xin Li --- arch/x86/include/asm/fred.h | 2 ++ arch/x86/mm/fault.c | 20 ++++++++++++++++++-- 2 files changed, 20 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/fred.h b/arch/x86/include/asm/fred.h index 6292b28d461d..38a90eae7c0f 100644 --- a/arch/x86/include/asm/fred.h +++ b/arch/x86/include/asm/fred.h @@ -92,6 +92,8 @@ static __always_inline unsigned long fred_event_data(struct pt_regs *regs) #define DEFINE_FRED_HANDLER(f) noinstr DECLARE_FRED_HANDLER(f) typedef DECLARE_FRED_HANDLER((*fred_handler)); +DECLARE_FRED_HANDLER(fred_exc_page_fault); + #endif /* __ASSEMBLY__ */ #endif /* CONFIG_X86_FRED */ diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 7b0d4ab894c8..f31053f32048 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -33,6 +33,7 @@ #include /* kvm_handle_async_pf */ #include /* fixup_vdso_exception() */ #include +#include /* fred_event_data() */ #define CREATE_TRACE_POINTS #include @@ -1528,9 +1529,10 @@ handle_page_fault(struct pt_regs *regs, unsigned long error_code, } } -DEFINE_IDTENTRY_RAW_ERRORCODE(exc_page_fault) +static __always_inline void page_fault_common(struct pt_regs *regs, + unsigned int error_code, + unsigned long address) { - unsigned long address = read_cr2(); irqentry_state_t state; prefetchw(¤t->mm->mmap_lock); @@ -1577,3 +1579,17 @@ DEFINE_IDTENTRY_RAW_ERRORCODE(exc_page_fault) irqentry_exit(regs, state); } + +DEFINE_IDTENTRY_RAW_ERRORCODE(exc_page_fault) +{ + page_fault_common(regs, error_code, read_cr2()); +} + +#ifdef CONFIG_X86_FRED + +DEFINE_FRED_HANDLER(fred_exc_page_fault) +{ + page_fault_common(regs, regs->orig_ax, fred_event_data(regs)); +} + +#endif /* CONFIG_X86_FRED */