From mboxrd@z Thu Jan 1 00:00:00 1970 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 97936C433EF for ; Fri, 26 Nov 2021 10:26:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377091AbhKZKaA (ORCPT ); Fri, 26 Nov 2021 05:30:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39082 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376947AbhKZK1Z (ORCPT ); Fri, 26 Nov 2021 05:27:25 -0500 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D2BC5C061375; Fri, 26 Nov 2021 02:15:56 -0800 (PST) Received: by mail-pl1-x636.google.com with SMTP id u17so6378556plg.9; Fri, 26 Nov 2021 02:15:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=v2b5IPHKA6jFRATzjbxNc3v/Tk2B7ZS0kG45l1odXAs=; b=HdO/AChZT8Q3d2p8RUelLTEhzvTKtCP14gID/d6Srw+u6SiMwNJmiUhlnQDJnDQibo wPPUfDlnvF+KNgJDQeN54Ad3Q+fJpoFv3mpzNiTrXgwJ4p4IEX6aE2aJPj6gL/ZbA22r /XobemIGzqIA3T9Qr7cKZ62TaDtmhAoI1X9ccnJURWSezEQyp/dZnihYqKDgw1haRx6V 5HXAZhCcd7z3xpPvyTXjun0asNQV1p3dhRGVfrlltQEb+DyArXwMtVUBxfq7+R6Ybrxc Eg8oIjrIzty9MfqNJIugsi4lBWbVikccpxIDcbTy0y4mH889jGdGCe28p2yI20XDpXLi LKmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=v2b5IPHKA6jFRATzjbxNc3v/Tk2B7ZS0kG45l1odXAs=; b=EWr1k/rdDnl0bAAQMf6zHXoyRxEl6YMna8mG7o95Qaj3Etw14KLeypWAdG5FhwaUba K1I3h5zu5LG8ig1j5RwwGZM7qyvN8dHjXdQ6jLRtqNoQlWNSrqqpUXEv9UcLvTpyz8CA EtUS1a9UqXoY00XVHEdB+5Kjsmt86n9MG6xQDs4rACSQSMCjP/ISFb7lUoteo//DV62N isWD+NsqIjXWqUu0jMdiDgCNrEtWEWp7//uZyqnBSnlmVxfiz94/tKksl5FT+uMJSJc7 VPl97hpLwS2v+mGmusax1ORMhHl/zavlHNpITdFxCAKXImmdyR5HPRguGNMHFytWIISq PPGQ== X-Gm-Message-State: AOAM533lisJgWojv4OWbPb4aI/FvXY6WDawFXTWc8VSNMO+E+dCBHTgD hChcNri1rSvcal7nvrGg1jHqcQ1nLBs= X-Google-Smtp-Source: ABdhPJyvYOYqfz6x5BB8zuhPfAn5EpATGAP+odljyXCrTDhBWJ8299Lt92C4aYysuC/6JtlV0v3niA== X-Received: by 2002:a17:90b:4ac1:: with SMTP id mh1mr14589143pjb.30.1637921756282; Fri, 26 Nov 2021 02:15:56 -0800 (PST) Received: from localhost ([47.251.3.230]) by smtp.gmail.com with ESMTPSA id d2sm6282334pfu.203.2021.11.26.02.15.55 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 26 Nov 2021 02:15:56 -0800 (PST) From: Lai Jiangshan To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, Lai Jiangshan , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Tony Luck , Juergen Gross , "Peter Zijlstra (Intel)" , Joerg Roedel , Javier Martinez Canillas , Daniel Bristot de Oliveira , Brijesh Singh , Andy Shevchenko , Tom Lendacky , linux-edac@vger.kernel.org Subject: [PATCH V6 38/49] x86/debug, mce: Use C entry code Date: Fri, 26 Nov 2021 18:11:58 +0800 Message-Id: <20211126101209.8613-39-jiangshanlai@gmail.com> X-Mailer: git-send-email 2.19.1.6.gb485710b In-Reply-To: <20211126101209.8613-1-jiangshanlai@gmail.com> References: <20211126101209.8613-1-jiangshanlai@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lai Jiangshan Use DEFINE_IDTENTRY_IST_ENTRY to emit C entry function in C files and use the function directly in entry_64.S. It also removes stack-protector from C files because the C entry code can NOT use percpu register until GSBASE is properly switched. And stack-protector depends on the percpu register to work. Signed-off-by: Lai Jiangshan --- arch/x86/entry/entry_64.S | 10 +--------- arch/x86/include/asm/idtentry.h | 1 + arch/x86/kernel/Makefile | 1 + arch/x86/kernel/cpu/mce/Makefile | 3 +++ 4 files changed, 6 insertions(+), 9 deletions(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index bd5e005316a3..ac05cbf894f5 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -465,16 +465,8 @@ SYM_CODE_START(\asmsym) testb $3, CS(%rsp) jnz .Lfrom_usermode_switch_stack_\@ - /* paranoid_entry returns GS information for paranoid_exit in EBX. */ - call paranoid_entry - - UNWIND_HINT_REGS - movq %rsp, %rdi /* pt_regs pointer */ - - call \cfunc - - call paranoid_exit + call ist_\cfunc jmp restore_regs_and_return_to_kernel /* Switch to the regular task stack and use the noist entry point */ diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h index 7b17ffa43e10..f274e4e2ca17 100644 --- a/arch/x86/include/asm/idtentry.h +++ b/arch/x86/include/asm/idtentry.h @@ -358,6 +358,7 @@ __visible __entry_text void ist_##func(struct pt_regs *regs) \ * Maps to DEFINE_IDTENTRY_RAW */ #define DEFINE_IDTENTRY_IST(func) \ + DEFINE_IDTENTRY_IST_ENTRY(func) \ DEFINE_IDTENTRY_RAW(func) /** diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 2ff3e600f426..8ac45801ba8b 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -50,6 +50,7 @@ KCOV_INSTRUMENT := n CFLAGS_head$(BITS).o += -fno-stack-protector CFLAGS_cc_platform.o += -fno-stack-protector +CFLAGS_traps.o += -fno-stack-protector CFLAGS_irq.o := -I $(srctree)/$(src)/../include/asm/trace diff --git a/arch/x86/kernel/cpu/mce/Makefile b/arch/x86/kernel/cpu/mce/Makefile index 015856abdbb1..555963416ec3 100644 --- a/arch/x86/kernel/cpu/mce/Makefile +++ b/arch/x86/kernel/cpu/mce/Makefile @@ -1,4 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 + +CFLAGS_core.o += -fno-stack-protector + obj-y = core.o severity.o genpool.o obj-$(CONFIG_X86_ANCIENT_MCE) += winchip.o p5.o -- 2.19.1.6.gb485710b