From patchwork Mon Jul 31 06:32:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13333738 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 31D8AC001DC for ; Mon, 31 Jul 2023 07:04:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230425AbjGaHEV (ORCPT ); Mon, 31 Jul 2023 03:04:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44682 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231223AbjGaHDv (ORCPT ); Mon, 31 Jul 2023 03:03:51 -0400 Received: from mgamail.intel.com (unknown [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6A27B10D3; Mon, 31 Jul 2023 00:02:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1690786949; x=1722322949; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=61pP2ZrTnfM4AWC4LzTY02SWj0Yo4OSnGRh0vm8RTJ0=; b=AKeecPh6ZKhoTu3YEFeY8q3jmeeMrJmrdBNVSQwmX4s3mN6arBBJkQaQ NEGDbtl5xFNAVnm9z+sd0NcsYS9Sir4GGDk7c0xyzBWseZW6N3THs7Uck 8VhpCRaSkFwtKzUzOaJJ76fkEUl2Mpsycze5fzKiAcukpEwe7sKSjkq/h NLXhF6I6Qj5xD1Vm8MNtRfec1F+MSLonn1XmT00oq+X+5WWTnlqCfD1AA JsmnStzsx8iKrzEgz0+PzhXXtfTcu4c0rOeC+f+hzxjEw2b55mmSPQ2OH qKwaSfnyRlrjbjWjiTg30U6SEFTUhsVRFUni2z23wIkVfOx01wFjrdZpR g==; X-IronPort-AV: E=McAfee;i="6600,9927,10787"; a="371649212" X-IronPort-AV: E=Sophos;i="6.01,244,1684825200"; d="scan'208";a="371649212" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Jul 2023 00:02:08 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.01,202,1684825200"; d="scan'208";a="871543449" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga001.fm.intel.com with ESMTP; 31 Jul 2023 00:02:09 -0700 From: Xin Li To: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org, linux-hyperv@vger.kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org Cc: Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Andy Lutomirski , Oleg Nesterov , Tony Luck , "K . Y . Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Sean Christopherson , Peter Zijlstra , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Josh Poimboeuf , "Paul E . McKenney" , Catalin Marinas , Randy Dunlap , Steven Rostedt , Kim Phillips , Xin Li , Hyeonggon Yoo <42.hyeyoo@gmail.com>, "Liam R . Howlett" , Sebastian Reichel , "Kirill A . Shutemov" , Suren Baghdasaryan , Pawan Gupta , Jiaxi Chen , Babu Moger , Jim Mattson , Sandipan Das , Lai Jiangshan , Hans de Goede , Reinette Chatre , Daniel Sneddon , Breno Leitao , Nikunj A Dadhania , Brian Gerst , Sami Tolvanen , Alexander Potapenko , Andrew Morton , Arnd Bergmann , "Eric W . Biederman" , Kees Cook , Masami Hiramatsu , Masahiro Yamada , Ze Gao , Fei Li , Conghui , Ashok Raj , "Jason A . Donenfeld" , Mark Rutland , Jacob Pan , Jiapeng Chong , Jane Malalane , David Woodhouse , Boris Ostrovsky , Arnaldo Carvalho de Melo , Yantengsi , Christophe Leroy , Sathvika Vasireddy Subject: [PATCH v9 18/36] x86/fred: Add a page fault entry stub for FRED Date: Sun, 30 Jul 2023 23:32:59 -0700 Message-Id: <20230731063317.3720-19-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230731063317.3720-1-xin3.li@intel.com> References: <20230731063317.3720-1-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) Tested-by: Shan Kang Signed-off-by: Xin Li --- arch/x86/include/asm/fred.h | 2 ++ arch/x86/mm/fault.c | 18 ++++++++++++++++-- 2 files changed, 18 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/fred.h b/arch/x86/include/asm/fred.h index b45c1bea5b7f..fb8e7b4f2d38 100644 --- a/arch/x86/include/asm/fred.h +++ b/arch/x86/include/asm/fred.h @@ -112,6 +112,8 @@ static __always_inline unsigned long fred_event_data(struct pt_regs *regs) 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 e8711b2cafaf..dd3df092d0f2 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -34,6 +34,7 @@ #include /* kvm_handle_async_pf */ #include /* fixup_vdso_exception() */ #include +#include #define CREATE_TRACE_POINTS #include @@ -1495,9 +1496,10 @@ 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); @@ -1544,3 +1546,15 @@ 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