From patchwork Wed May 4 09:39:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 12837636 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2B438C433EF for ; Wed, 4 May 2022 10:42:16 +0000 (UTC) Received: from localhost ([::1]:57226 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nmCSV-0005vE-0A for qemu-devel@archiver.kernel.org; Wed, 04 May 2022 06:42:15 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54708) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nmBTL-0004LA-BW for qemu-devel@nongnu.org; Wed, 04 May 2022 05:39:03 -0400 Received: from mail.ispras.ru ([83.149.199.84]:37088) by eggs.gnu.org with esmtps (TLS1.2:DHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nmBTJ-0005tn-NG for qemu-devel@nongnu.org; Wed, 04 May 2022 05:39:03 -0400 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 492B14076253; Wed, 4 May 2022 09:39:00 +0000 (UTC) Subject: [PATCH v2 2/9] replay: notify vCPU when BH is scheduled From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Cc: pavel.dovgalyuk@ispras.ru, pbonzini@redhat.com, alex.bennee@linaro.org, crosa@redhat.com, f4bug@amsat.org Date: Wed, 04 May 2022 12:39:00 +0300 Message-ID: <165165714007.1062896.13693480594668205608.stgit@pasha-ThinkPad-X280> In-Reply-To: <165165712922.1062896.3966737516733314504.stgit@pasha-ThinkPad-X280> References: <165165712922.1062896.3966737516733314504.stgit@pasha-ThinkPad-X280> User-Agent: StGit/0.23 MIME-Version: 1.0 Received-SPF: pass client-ip=83.149.199.84; envelope-from=pavel.dovgalyuk@ispras.ru; helo=mail.ispras.ru X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" vCPU execution should be suspended when new BH is scheduled. This is needed to avoid guest timeouts caused by the long cycles of the execution. In replay mode execution may hang when vCPU sleeps and block event comes to the queue. This patch adds notification which wakes up vCPU or interrupts execution of guest code. Signed-off-by: Pavel Dovgalyuk Reviewed-by: Richard Henderson --- v2: changed first_cpu to current_cpu (suggested by Richard Henderson) --- include/sysemu/cpu-timers.h | 1 + softmmu/icount.c | 8 ++++++++ stubs/icount.c | 4 ++++ util/async.c | 8 ++++++++ 4 files changed, 21 insertions(+) diff --git a/include/sysemu/cpu-timers.h b/include/sysemu/cpu-timers.h index ed6ee5c46c..2e786fe7fb 100644 --- a/include/sysemu/cpu-timers.h +++ b/include/sysemu/cpu-timers.h @@ -59,6 +59,7 @@ int64_t icount_round(int64_t count); /* if the CPUs are idle, start accounting real time to virtual clock. */ void icount_start_warp_timer(void); void icount_account_warp_timer(void); +void icount_notify_exit(void); /* * CPU Ticks and Clock diff --git a/softmmu/icount.c b/softmmu/icount.c index 5ca271620d..1cafec5014 100644 --- a/softmmu/icount.c +++ b/softmmu/icount.c @@ -486,3 +486,11 @@ void icount_configure(QemuOpts *opts, Error **errp) qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + NANOSECONDS_PER_SECOND / 10); } + +void icount_notify_exit(void) +{ + if (icount_enabled() && current_cpu) { + qemu_cpu_kick(current_cpu); + qemu_clock_notify(QEMU_CLOCK_VIRTUAL); + } +} diff --git a/stubs/icount.c b/stubs/icount.c index f13c43568b..6df8c2bf7d 100644 --- a/stubs/icount.c +++ b/stubs/icount.c @@ -43,3 +43,7 @@ void icount_account_warp_timer(void) { abort(); } + +void icount_notify_exit(void) +{ +} diff --git a/util/async.c b/util/async.c index 2ea1172f3e..c376b6c2b4 100644 --- a/util/async.c +++ b/util/async.c @@ -33,6 +33,7 @@ #include "block/raw-aio.h" #include "qemu/coroutine_int.h" #include "qemu/coroutine-tls.h" +#include "sysemu/cpu-timers.h" #include "trace.h" /***********************************************************/ @@ -185,6 +186,13 @@ void qemu_bh_schedule_idle(QEMUBH *bh) void qemu_bh_schedule(QEMUBH *bh) { aio_bh_enqueue(bh, BH_SCHEDULED); + /* + * Workaround for record/replay. + * vCPU execution should be suspended when new BH is set. + * This is needed to avoid guest timeouts caused + * by the long cycles of the execution. + */ + icount_notify_exit(); } /* This func is async.