From patchwork Thu Sep 28 04:49:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: John Snow X-Patchwork-Id: 1840490 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=MvJhrVfD; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4Rx1KW4h51z1ypN for ; Thu, 28 Sep 2023 14:51:43 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qliya-0002Ok-BC; Thu, 28 Sep 2023 00:50:12 -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 1qliyY-0002OD-O1 for qemu-devel@nongnu.org; Thu, 28 Sep 2023 00:50:10 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qliyH-0006hB-Gi for qemu-devel@nongnu.org; Thu, 28 Sep 2023 00:50:10 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1695876591; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3O/UX3IJX3ftQTm9VfwmH6srYggBUXaw1R2A+RoY+rg=; b=MvJhrVfDOsFwjcZGGk+DbbpSVlshiWsNer84DJwrFoR3w+lNXUNEaSSQptmwZjHXV1Y5lb uvCT5Go9HuVL7JdfASrhsCaenLPttrvBfgC5kiAY/vejCJjgM9fK0wynPGlI1vnO59L3cp ut06WSQv0+VZP3pZp+/79df6k0SBmPE= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-643-oEIkfVumNtOl9-9rl1TSAQ-1; Thu, 28 Sep 2023 00:49:48 -0400 X-MC-Unique: oEIkfVumNtOl9-9rl1TSAQ-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7643F3C108DA; Thu, 28 Sep 2023 04:49:47 +0000 (UTC) Received: from scv.redhat.com (unknown [10.22.16.75]) by smtp.corp.redhat.com (Postfix) with ESMTP id CE4F51054FC1; Thu, 28 Sep 2023 04:49:46 +0000 (UTC) From: John Snow To: qemu-devel@nongnu.org Cc: Kevin Wolf , =?utf-8?q?C=C3=A9dric_Le_Goater?= , Beraldo Leal , Cleber Rosa , qemu-block@nongnu.org, Hanna Reitz , "Michael S. Tsirkin" , John Snow , qemu-arm@nongnu.org, Joel Stanley , =?utf-8?q?Philippe_Math?= =?utf-8?q?ieu-Daud=C3=A9?= , Wainer dos Santos Moschetta , Andrew Jeffery , Daniel Berrange , Ani Sinha , Peter Maydell Subject: [PATCH v3 4/6] python/machine: use socketpair() for console connections Date: Thu, 28 Sep 2023 00:49:41 -0400 Message-ID: <20230928044943.849073-5-jsnow@redhat.com> In-Reply-To: <20230928044943.849073-1-jsnow@redhat.com> References: <20230928044943.849073-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 Received-SPF: pass client-ip=170.10.129.124; envelope-from=jsnow@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Create a socketpair for the console output. This should help eliminate race conditions around console text early in the boot process that might otherwise have been dropped on the floor before being able to connect to QEMU under "server,nowait". Signed-off-by: John Snow Reviewed-by: Ani Sinha Reviewed-by: Daniel P. Berrangé --- python/qemu/machine/machine.py | 30 +++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-) diff --git a/python/qemu/machine/machine.py b/python/qemu/machine/machine.py index e26109e6f0e..4156b8cf7d4 100644 --- a/python/qemu/machine/machine.py +++ b/python/qemu/machine/machine.py @@ -159,6 +159,8 @@ def __init__(self, self._name = name or f"{id(self):x}" self._sock_pair: Optional[Tuple[socket.socket, socket.socket]] = None + self._cons_sock_pair: Optional[ + Tuple[socket.socket, socket.socket]] = None self._temp_dir: Optional[str] = None self._base_temp_dir = base_temp_dir self._sock_dir = sock_dir @@ -316,8 +318,9 @@ def _base_args(self) -> List[str]: for _ in range(self._console_index): args.extend(['-serial', 'null']) if self._console_set: - chardev = ('socket,id=console,path=%s,server=on,wait=off' % - self._console_address) + assert self._cons_sock_pair is not None + fd = self._cons_sock_pair[0].fileno() + chardev = f"socket,id=console,fd={fd}" args.extend(['-chardev', chardev]) if self._console_device_type is None: args.extend(['-serial', 'chardev:console']) @@ -352,6 +355,10 @@ def _pre_launch(self) -> None: nickname=self._name ) + if self._console_set: + self._cons_sock_pair = socket.socketpair() + os.set_inheritable(self._cons_sock_pair[0].fileno(), True) + # NOTE: Make sure any opened resources are *definitely* freed in # _post_shutdown()! # pylint: disable=consider-using-with @@ -369,6 +376,9 @@ def _pre_launch(self) -> None: def _post_launch(self) -> None: if self._sock_pair: self._sock_pair[0].close() + if self._cons_sock_pair: + self._cons_sock_pair[0].close() + if self._qmp_connection: if self._sock_pair: self._qmp.connect() @@ -524,6 +534,11 @@ def _early_cleanup(self) -> None: self._console_socket.close() self._console_socket = None + if self._cons_sock_pair: + self._cons_sock_pair[0].close() + self._cons_sock_pair[1].close() + self._cons_sock_pair = None + def _hard_shutdown(self) -> None: """ Perform early cleanup, kill the VM, and wait for it to terminate. @@ -885,10 +900,19 @@ def console_socket(self) -> socket.socket: """ if self._console_socket is None: LOG.debug("Opening console socket") + if not self._console_set: + raise QEMUMachineError( + "Attempt to access console socket with no connection") + assert self._cons_sock_pair is not None + # os.dup() is used here for sock_fd because otherwise we'd + # have two rich python socket objects that would each try to + # close the same underlying fd when either one gets garbage + # collected. self._console_socket = console_socket.ConsoleSocket( - self._console_address, + sock_fd=os.dup(self._cons_sock_pair[1].fileno()), file=self._console_log_path, drain=self._drain_console) + self._cons_sock_pair[1].close() return self._console_socket @property