From patchwork Wed Mar 20 16:16:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Andrey Drobyshev X-Patchwork-Id: 13598005 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 75EA1C6FD1F for ; Wed, 20 Mar 2024 16:17:30 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rmycs-0007aE-Ck; Wed, 20 Mar 2024 12:17:17 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rmycc-0007TE-Ef for qemu-devel@nongnu.org; Wed, 20 Mar 2024 12:16:59 -0400 Received: from relay.virtuozzo.com ([130.117.225.111]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rmyca-0003sl-FL for qemu-devel@nongnu.org; Wed, 20 Mar 2024 12:16:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=virtuozzo.com; s=relay; h=Content-Type:MIME-Version:Message-Id:Date:Subject :From; bh=dPDq2E1a5t3XOvJE0MnFN0/zcRmXvO+hIToGf+t3lWI=; b=lr8sSaRGV+4pb/p4N4I 2sCsYZF+AcobbJA9SbZvZ1xwGY26NxymFHU7Yox68qHw+HOsba3sAHnA6Obbtm3JT4K2W1HHrELfc JqITv6ZWXQIoOLzqM8xlj3paq3Lq6TI9OGAQ52HoQn3XiCECl7MKjx/3UoVPMrId1Hw6dTQmS0J/B r0U5qQo51kyBEoe8IeICl+BwO8jIs363FQUengmv3rd/DfvYbWS1e1jVL158Ow4kmBrcRjlcZiY56 wk0v4pk0FDYjKjtHc+NOOgYehb7uSi5yxBGz3gVnkAtdFZae+w/k0SKvv61A1l44RUdRog86dUCt7 ar1HplfhfQdr3Mw==; Received: from [130.117.225.1] (helo=dev005.ch-qa.vzint.dev) by relay.virtuozzo.com with esmtp (Exim 4.96) (envelope-from ) id 1rmyaM-006TNN-2R; Wed, 20 Mar 2024 17:16:38 +0100 From: Andrey Drobyshev To: qemu-devel@nongnu.org Cc: berrange@redhat.com, michael.roth@amd.com, kkostiuk@redhat.com, marcandre.lureau@redhat.com, philmd@linaro.org, andrey.drobyshev@virtuozzo.com, den@virtuozzo.com Subject: [PATCH v4 6/7] qga/commands-posix: don't do fork()/exec() when suspending via sysfs Date: Wed, 20 Mar 2024 18:16:47 +0200 Message-Id: <20240320161648.158226-7-andrey.drobyshev@virtuozzo.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20240320161648.158226-1-andrey.drobyshev@virtuozzo.com> References: <20240320161648.158226-1-andrey.drobyshev@virtuozzo.com> MIME-Version: 1.0 Received-SPF: pass client-ip=130.117.225.111; envelope-from=andrey.drobyshev@virtuozzo.com; helo=relay.virtuozzo.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, 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-bounces+qemu-devel=archiver.kernel.org@nongnu.org Since commit 246d76eba ("qga: guest_suspend: decoupling pm-utils and sys logic") pm-utils logic is running in a separate child from the sysfs logic. Now when suspending via sysfs we don't really need to do that in a separate process as we only need to perform one write to /sys/power/state. Let's just use g_file_set_contents() to simplify things here. Suggested-by: Daniel P. Berrangé Signed-off-by: Andrey Drobyshev Reviewed-by: Daniel P. Berrangé --- qga/commands-posix.c | 41 +++++------------------------------------ 1 file changed, 5 insertions(+), 36 deletions(-) diff --git a/qga/commands-posix.c b/qga/commands-posix.c index 9b993772f5..9910957ff5 100644 --- a/qga/commands-posix.c +++ b/qga/commands-posix.c @@ -1928,52 +1928,21 @@ static bool linux_sys_state_supports_mode(SuspendMode mode, Error **errp) static void linux_sys_state_suspend(SuspendMode mode, Error **errp) { - Error *local_err = NULL; + g_autoptr(GError) local_gerr = NULL; const char *sysfile_strs[3] = {"disk", "mem", NULL}; const char *sysfile_str = sysfile_strs[mode]; - pid_t pid; - int status; if (!sysfile_str) { error_setg(errp, "unknown guest suspend mode"); return; } - pid = fork(); - if (!pid) { - /* child */ - int fd; - - setsid(); - reopen_fd_to_null(0); - reopen_fd_to_null(1); - reopen_fd_to_null(2); - - fd = open(LINUX_SYS_STATE_FILE, O_WRONLY); - if (fd < 0) { - _exit(EXIT_FAILURE); - } - - if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) { - _exit(EXIT_FAILURE); - } - - _exit(EXIT_SUCCESS); - } else if (pid < 0) { - error_setg_errno(errp, errno, "failed to create child process"); - return; - } - - ga_wait_child(pid, &status, &local_err); - if (local_err) { - error_propagate(errp, local_err); + if (!g_file_set_contents(LINUX_SYS_STATE_FILE, sysfile_str, + -1, &local_gerr)) { + error_setg(errp, "suspend: cannot write to '%s': %s", + LINUX_SYS_STATE_FILE, local_gerr->message); return; } - - if (WEXITSTATUS(status)) { - error_setg(errp, "child process has failed to suspend"); - } - } static void guest_suspend(SuspendMode mode, Error **errp)