From patchwork Tue Jul 4 08:38:26 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Llu=C3=ADs_Vilanova?= X-Patchwork-Id: 783784 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3x1y9108J9z9s3T for ; Tue, 4 Jul 2017 18:39:16 +1000 (AEST) Received: from localhost ([::1]:39462 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dSJMW-0001Bs-7y for incoming@patchwork.ozlabs.org; Tue, 04 Jul 2017 04:39:12 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40109) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dSJM5-00019w-4F for qemu-devel@nongnu.org; Tue, 04 Jul 2017 04:38:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dSJM1-00027h-6w for qemu-devel@nongnu.org; Tue, 04 Jul 2017 04:38:45 -0400 Received: from roura.ac.upc.es ([147.83.33.10]:46385) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dSJM0-00026s-Qf for qemu-devel@nongnu.org; Tue, 04 Jul 2017 04:38:41 -0400 Received: from correu-1.ac.upc.es (correu-1.ac.upc.es [147.83.30.91]) by roura.ac.upc.es (8.13.8/8.13.8) with ESMTP id v648cbiM008893; Tue, 4 Jul 2017 10:38:37 +0200 Received: from localhost (63.red-83-51-187.dynamicip.rima-tde.net [83.51.187.63]) by correu-1.ac.upc.es (Postfix) with ESMTPSA id 35166258; Tue, 4 Jul 2017 10:38:32 +0200 (CEST) From: =?utf-8?b?TGx1w61z?= Vilanova To: qemu-devel@nongnu.org Date: Tue, 4 Jul 2017 10:38:26 +0200 Message-Id: <149915750615.6295.3713699402253529487.stgit@frigg.lan> X-Mailer: git-send-email 2.13.2 In-Reply-To: <149915701334.6295.1724301929524364123.stgit@frigg.lan> References: <149915701334.6295.1724301929524364123.stgit@frigg.lan> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-MIME-Autoconverted: from 8bit to quoted-printable by roura.ac.upc.es id v648cbiM008893 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x [fuzzy] X-Received-From: 147.83.33.10 Subject: [Qemu-devel] [PATCH v11 2/6] trace: [tcg] Delay changes to dynamic state when translating X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Emilio G. Cota" , Eduardo Habkost , Stefan Hajnoczi Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This keeps consistency across all decisions taken during translation when the dynamic state of a vCPU is changed in the middle of translating some guest code. Signed-off-by: Lluís Vilanova Reviewed-by: Richard Henderson Reviewed-by: Emilio G. Cota --- include/qom/cpu.h | 3 +++ trace/control-target.c | 20 +++++++++++++++++--- 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/include/qom/cpu.h b/include/qom/cpu.h index 31529adf2a..0f507e6f71 100644 --- a/include/qom/cpu.h +++ b/include/qom/cpu.h @@ -303,6 +303,8 @@ struct qemu_work_item; * @kvm_fd: vCPU file descriptor for KVM. * @work_mutex: Lock to prevent multiple access to queued_work_*. * @queued_work_first: First asynchronous work pending. + * @trace_dstate_delayed: Delayed changes to trace_dstate (includes all changes + * to @trace_dstate). * @trace_dstate: Dynamic tracing state of events for this vCPU (bitmask). * * State of one CPU core or thread. @@ -375,6 +377,7 @@ struct CPUState { struct kvm_run *kvm_run; /* Used for events with 'vcpu' and *without* the 'disabled' properties */ + DECLARE_BITMAP(trace_dstate_delayed, CPU_TRACE_DSTATE_MAX_EVENTS); DECLARE_BITMAP(trace_dstate, CPU_TRACE_DSTATE_MAX_EVENTS); /* TODO Move common fields from CPUArchState here. */ diff --git a/trace/control-target.c b/trace/control-target.c index 6266e6380d..d30fa5df75 100644 --- a/trace/control-target.c +++ b/trace/control-target.c @@ -1,7 +1,7 @@ /* * Interface for configuring and controlling the state of tracing events. * - * Copyright (C) 2014-2016 Lluís Vilanova + * Copyright (C) 2014-2017 Lluís Vilanova * * This work is licensed under the terms of the GNU GPL, version 2 or later. * See the COPYING file in the top-level directory. @@ -57,6 +57,13 @@ void trace_event_set_state_dynamic(TraceEvent *ev, bool state) } } +static void trace_event_synchronize_vcpu_state_dynamic( + CPUState *vcpu, run_on_cpu_data ignored) +{ + bitmap_copy(vcpu->trace_dstate, vcpu->trace_dstate_delayed, + CPU_TRACE_DSTATE_MAX_EVENTS); +} + void trace_event_set_vcpu_state_dynamic(CPUState *vcpu, TraceEvent *ev, bool state) { @@ -69,13 +76,20 @@ void trace_event_set_vcpu_state_dynamic(CPUState *vcpu, if (state_pre != state) { if (state) { trace_events_enabled_count++; - set_bit(vcpu_id, vcpu->trace_dstate); + set_bit(vcpu_id, vcpu->trace_dstate_delayed); (*ev->dstate)++; } else { trace_events_enabled_count--; - clear_bit(vcpu_id, vcpu->trace_dstate); + clear_bit(vcpu_id, vcpu->trace_dstate_delayed); (*ev->dstate)--; } + /* + * Delay changes until next TB; we want all TBs to be built from a + * single set of dstate values to ensure consistency of generated + * tracing code. + */ + async_run_on_cpu(vcpu, trace_event_synchronize_vcpu_state_dynamic, + RUN_ON_CPU_NULL); } }