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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 34BC4C4320E for ; Fri, 20 Aug 2021 22:50:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1F4B5610FF for ; Fri, 20 Aug 2021 22:50:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240655AbhHTWvL (ORCPT ); Fri, 20 Aug 2021 18:51:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37786 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238821AbhHTWvI (ORCPT ); Fri, 20 Aug 2021 18:51:08 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ABE89C061756 for ; Fri, 20 Aug 2021 15:50:29 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id z2-20020a5b0b02000000b005982be23a34so4538253ybp.19 for ; Fri, 20 Aug 2021 15:50:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:to:cc; bh=gJGDno5klw1XWXHZwjjz8QtpqHXGwJ6PM18IirOkI4E=; b=Y/9oq0nMIPvoCL9CTWZ/XfjOgK5S9SGDHb2RXM7plfEV8R736kfS/mVaau+uS61SJS ZcHbTFNVquLsTw5/Cgp7gZ9GlIaPPC1AuedEsix1Xl+nOiYD5bszAV76QDFt/JgvEqCl wsyG1kyx9Jl3u03r2nF2Oub5MJ93qXCws2Pa5A1Zf6UmXmszQK8I460CPN6ayIpMhkY8 eMX5TGteHEALuSiHGHkxbmeXFfVFIJ6NzZZbghS+9tm87+GhTwMdEMS1gn49Y1aH42fw zJ4BqNg/gPBQ3v9tbwL0EAJ+OXKA9B2Gf9tro5WKFD5dQMrDYXujqk8rPQDDTP8IPIYq W58w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:to:cc; bh=gJGDno5klw1XWXHZwjjz8QtpqHXGwJ6PM18IirOkI4E=; b=r9nU0lyBu22fbFrMFkSIVN17PD8d8lXWp9EIt7+qhaugvYhBlBD7wltwkN7Ox5cc7X 7z2pO+qJzfsNRkUltnHOBgAo9uTeElQ3jkpaud2gVHDDKBTfGR82+QOCGqiortNMyCNp ruRmghjsOLjx4NH7RWAnTDpsp7Lgl5mSKO8KwAD3MwN2VVZ3L68Ivxt6fCcCm8+S0QI0 oAngp2fm6OSkIvYJ6/jXhNPAWX7P+LQgrM3cBPEvzM53YhC1sKhj87KfIXQBrPAGubeb U+fyjNxytoeXasBsMxGWsESUHraE/5jj4fQrDBhTFDYIFOUeHYRQZUiWW8Or+Ad6BXoG cfOQ== X-Gm-Message-State: AOAM531fd575iA9N4NgUXJszLs4YFBltte9scyN9PJ4G+kFj8ZCRA761 6uL2q/Y59hpvPUByIbUF42zLZ4Wgvk4= X-Google-Smtp-Source: ABdhPJyV62gidknEb4k4a6DMafmSrAzZNIWz+Uk5mR+ELt24rWU/K+sp1dx9Z4H73mtx1X87SZND7NGjzdo= X-Received: from seanjc798194.pdx.corp.google.com ([2620:15c:90:200:f11d:a281:af9b:5de6]) (user=seanjc job=sendgmr) by 2002:a25:d242:: with SMTP id j63mr27053838ybg.99.1629499828874; Fri, 20 Aug 2021 15:50:28 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 20 Aug 2021 15:49:59 -0700 In-Reply-To: <20210820225002.310652-1-seanjc@google.com> Message-Id: <20210820225002.310652-3-seanjc@google.com> Mime-Version: 1.0 References: <20210820225002.310652-1-seanjc@google.com> X-Mailer: git-send-email 2.33.0.rc2.250.ged5fa647cd-goog Subject: [PATCH v2 2/5] entry: rseq: Call rseq_handle_notify_resume() in tracehook_notify_resume() From: Sean Christopherson To: Russell King , Catalin Marinas , Will Deacon , Guo Ren , Thomas Bogendoerfer , Michael Ellerman , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Steven Rostedt , Ingo Molnar , Oleg Nesterov , Thomas Gleixner , Peter Zijlstra , Andy Lutomirski , Mathieu Desnoyers , "Paul E. McKenney" , Boqun Feng , Paolo Bonzini , Shuah Khan Cc: Benjamin Herrenschmidt , Paul Mackerras , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, Peter Foley , Shakeel Butt , Sean Christopherson , Ben Gardon Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Invoke rseq_handle_notify_resume() from tracehook_notify_resume() now that the two function are always called back-to-back by architectures that have rseq. The rseq helper is stubbed out for architectures that don't support rseq, i.e. this is a nop across the board. Note, tracehook_notify_resume() is horribly named and arguably does not belong in tracehook.h as literally every line of code in it has nothing to do with tracing. But, that's been true since commit a42c6ded827d ("move key_repace_session_keyring() into tracehook_notify_resume()") first usurped tracehook_notify_resume() back in 2012. Punt cleaning that mess up to future patches. No functional change intended. Acked-by: Mathieu Desnoyers Signed-off-by: Sean Christopherson --- arch/arm/kernel/signal.c | 1 - arch/arm64/kernel/signal.c | 1 - arch/csky/kernel/signal.c | 4 +--- arch/mips/kernel/signal.c | 4 +--- arch/powerpc/kernel/signal.c | 4 +--- arch/s390/kernel/signal.c | 1 - include/linux/tracehook.h | 2 ++ kernel/entry/common.c | 4 +--- kernel/entry/kvm.c | 4 +--- 9 files changed, 7 insertions(+), 18 deletions(-) diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c index a3a38d0a4c85..9df68d139965 100644 --- a/arch/arm/kernel/signal.c +++ b/arch/arm/kernel/signal.c @@ -670,7 +670,6 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall) uprobe_notify_resume(regs); } else { tracehook_notify_resume(regs); - rseq_handle_notify_resume(NULL, regs); } } local_irq_disable(); diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index 23036334f4dc..22b55db13da6 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -951,7 +951,6 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, if (thread_flags & _TIF_NOTIFY_RESUME) { tracehook_notify_resume(regs); - rseq_handle_notify_resume(NULL, regs); /* * If we reschedule after checking the affinity diff --git a/arch/csky/kernel/signal.c b/arch/csky/kernel/signal.c index 312f046d452d..bc4238b9f709 100644 --- a/arch/csky/kernel/signal.c +++ b/arch/csky/kernel/signal.c @@ -260,8 +260,6 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, if (thread_info_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) do_signal(regs); - if (thread_info_flags & _TIF_NOTIFY_RESUME) { + if (thread_info_flags & _TIF_NOTIFY_RESUME) tracehook_notify_resume(regs); - rseq_handle_notify_resume(NULL, regs); - } } diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c index f1e985109da0..c9b2a75563e1 100644 --- a/arch/mips/kernel/signal.c +++ b/arch/mips/kernel/signal.c @@ -906,10 +906,8 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused, if (thread_info_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) do_signal(regs); - if (thread_info_flags & _TIF_NOTIFY_RESUME) { + if (thread_info_flags & _TIF_NOTIFY_RESUME) tracehook_notify_resume(regs); - rseq_handle_notify_resume(NULL, regs); - } user_enter(); } diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c index e600764a926c..b93b87df499d 100644 --- a/arch/powerpc/kernel/signal.c +++ b/arch/powerpc/kernel/signal.c @@ -293,10 +293,8 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) do_signal(current); } - if (thread_info_flags & _TIF_NOTIFY_RESUME) { + if (thread_info_flags & _TIF_NOTIFY_RESUME) tracehook_notify_resume(regs); - rseq_handle_notify_resume(NULL, regs); - } } static unsigned long get_tm_stackpointer(struct task_struct *tsk) diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c index 78ef53b29958..b307db26bf2d 100644 --- a/arch/s390/kernel/signal.c +++ b/arch/s390/kernel/signal.c @@ -537,5 +537,4 @@ void arch_do_signal_or_restart(struct pt_regs *regs, bool has_signal) void do_notify_resume(struct pt_regs *regs) { tracehook_notify_resume(regs); - rseq_handle_notify_resume(NULL, regs); } diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h index 3e80c4bc66f7..2564b7434b4d 100644 --- a/include/linux/tracehook.h +++ b/include/linux/tracehook.h @@ -197,6 +197,8 @@ static inline void tracehook_notify_resume(struct pt_regs *regs) mem_cgroup_handle_over_high(); blkcg_maybe_throttle_current(); + + rseq_handle_notify_resume(NULL, regs); } /* diff --git a/kernel/entry/common.c b/kernel/entry/common.c index bf16395b9e13..d5a61d565ad5 100644 --- a/kernel/entry/common.c +++ b/kernel/entry/common.c @@ -171,10 +171,8 @@ static unsigned long exit_to_user_mode_loop(struct pt_regs *regs, if (ti_work & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) handle_signal_work(regs, ti_work); - if (ti_work & _TIF_NOTIFY_RESUME) { + if (ti_work & _TIF_NOTIFY_RESUME) tracehook_notify_resume(regs); - rseq_handle_notify_resume(NULL, regs); - } /* Architecture specific TIF work */ arch_exit_to_user_mode_work(regs, ti_work); diff --git a/kernel/entry/kvm.c b/kernel/entry/kvm.c index 049fd06b4c3d..49972ee99aff 100644 --- a/kernel/entry/kvm.c +++ b/kernel/entry/kvm.c @@ -19,10 +19,8 @@ static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu, unsigned long ti_work) if (ti_work & _TIF_NEED_RESCHED) schedule(); - if (ti_work & _TIF_NOTIFY_RESUME) { + if (ti_work & _TIF_NOTIFY_RESUME) tracehook_notify_resume(NULL); - rseq_handle_notify_resume(NULL, NULL); - } ret = arch_xfer_to_guest_mode_handle_work(vcpu, ti_work); if (ret) -- 2.33.0.rc2.250.ged5fa647cd-goog