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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E00D3C10F29 for ; Sun, 8 Mar 2020 23:24:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C063E208CD for ; Sun, 8 Mar 2020 23:24:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726659AbgCHXXw (ORCPT ); Sun, 8 Mar 2020 19:23:52 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:57218 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726373AbgCHXXw (ORCPT ); Sun, 8 Mar 2020 19:23:52 -0400 Received: from p5de0bf0b.dip0.t-ipconnect.de ([93.224.191.11] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1jB5Gg-00034g-FB; Mon, 09 Mar 2020 00:23:35 +0100 Received: from nanos.tec.linutronix.de (localhost [IPv6:::1]) by nanos.tec.linutronix.de (Postfix) with ESMTP id 8760E1040A9; Mon, 9 Mar 2020 00:23:29 +0100 (CET) Message-Id: <20200308222609.621492144@linutronix.de> User-Agent: quilt/0.65 Date: Sun, 08 Mar 2020 23:24:06 +0100 From: Thomas Gleixner To: LKML Cc: x86@kernel.org, Steven Rostedt , Brian Gerst , Juergen Gross , Frederic Weisbecker , Alexandre Chartre Subject: [patch part-II V2 07/13] x86/entry: Move irq tracing on syscall entry to C-code References: <20200308222359.370649591@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now that the C entry points are safe, move the irq flags tracing code into the entry helper. Signed-off-by: Thomas Gleixner Reviewed-by: Frederic Weisbecker Reviewed-by: Alexandre Chartre --- arch/x86/entry/common.c | 5 +++++ arch/x86/entry/entry_32.S | 12 ------------ arch/x86/entry/entry_64.S | 2 -- arch/x86/entry/entry_64_compat.S | 18 ------------------ 4 files changed, 5 insertions(+), 32 deletions(-) --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -58,6 +58,11 @@ static inline void enter_from_user_mode( */ static __always_inline void syscall_entry_apply_fixups(void) { + /* + * Usermode is traced as interrupts enabled, but the syscall entry + * mechanisms disable interrupts. Tell the tracer. + */ + trace_hardirqs_off(); enter_from_user_mode(); local_irq_enable(); } --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -960,12 +960,6 @@ SYM_FUNC_START(entry_SYSENTER_32) jnz .Lsysenter_fix_flags .Lsysenter_flags_fixed: - /* - * User mode is traced as though IRQs are on, and SYSENTER - * turned them off. - */ - TRACE_IRQS_OFF - movl %esp, %eax call do_fast_syscall_32 /* XEN PV guests always use IRET path */ @@ -1075,12 +1069,6 @@ SYM_FUNC_START(entry_INT80_32) SAVE_ALL pt_regs_ax=$-ENOSYS switch_stacks=1 /* save rest */ - /* - * User mode is traced as though IRQs are on, and the interrupt gate - * turned them off. - */ - TRACE_IRQS_OFF - movl %esp, %eax call do_int80_syscall_32 .Lsyscall_32_done: --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -167,8 +167,6 @@ SYM_INNER_LABEL(entry_SYSCALL_64_after_h PUSH_AND_CLEAR_REGS rax=$-ENOSYS - TRACE_IRQS_OFF - /* IRQs are off. */ movq %rax, %rdi movq %rsp, %rsi --- a/arch/x86/entry/entry_64_compat.S +++ b/arch/x86/entry/entry_64_compat.S @@ -129,12 +129,6 @@ SYM_FUNC_START(entry_SYSENTER_compat) jnz .Lsysenter_fix_flags .Lsysenter_flags_fixed: - /* - * User mode is traced as though IRQs are on, and SYSENTER - * turned them off. - */ - TRACE_IRQS_OFF - movq %rsp, %rdi call do_fast_syscall_32 /* XEN PV guests always use IRET path */ @@ -247,12 +241,6 @@ SYM_INNER_LABEL(entry_SYSCALL_compat_aft pushq $0 /* pt_regs->r15 = 0 */ xorl %r15d, %r15d /* nospec r15 */ - /* - * User mode is traced as though IRQs are on, and SYSENTER - * turned them off. - */ - TRACE_IRQS_OFF - movq %rsp, %rdi call do_fast_syscall_32 /* XEN PV guests always use IRET path */ @@ -403,12 +391,6 @@ SYM_CODE_START(entry_INT80_compat) xorl %r15d, %r15d /* nospec r15 */ cld - /* - * User mode is traced as though IRQs are on, and the interrupt - * gate turned them off. - */ - TRACE_IRQS_OFF - movq %rsp, %rdi call do_int80_syscall_32 .Lsyscall_32_done: