From patchwork Mon Jul 13 07:51:12 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Huth X-Patchwork-Id: 277993 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=-10.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED 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 0C6D4C433E8 for ; Mon, 13 Jul 2020 07:52:05 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id CAAE620702 for ; Mon, 13 Jul 2020 07:52:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="FnNO6hMb" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CAAE620702 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:54632 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jutFs-0005yG-17 for qemu-devel@archiver.kernel.org; Mon, 13 Jul 2020 03:52:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36030) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jutFC-0005I1-7I for qemu-devel@nongnu.org; Mon, 13 Jul 2020 03:51:22 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:33853 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jutF9-000252-Rx for qemu-devel@nongnu.org; Mon, 13 Jul 2020 03:51:21 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1594626678; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type; bh=raj5TYQLe53uUqu3yJV6gBfCygQszCdhm2fDff5kR84=; b=FnNO6hMbR0f64GP9YuaHXDVEN6qlL1fQmoLdx+jk/1u46ykm80YhDyxpLcLKqS6xJ9scGT 1uhBpiqKrPFlMa8VR1tuqVmQ38LLgbFnSVQXbBlMWuZcN7FMKXxm0xXKPkowKSeEMkWIcu ByC4XfDq3APK9tPqJRhkuyor3Onz0Eg= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-472-4x6ksVxWPt-XFHt11CJadQ-1; Mon, 13 Jul 2020 03:51:16 -0400 X-MC-Unique: 4x6ksVxWPt-XFHt11CJadQ-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 978861009610; Mon, 13 Jul 2020 07:51:15 +0000 (UTC) Received: from thuth.com (ovpn-112-125.ams2.redhat.com [10.36.112.125]) by smtp.corp.redhat.com (Postfix) with ESMTP id 780185BAC3; Mon, 13 Jul 2020 07:51:14 +0000 (UTC) From: Thomas Huth To: Cornelia Huck , qemu-devel@nongnu.org Subject: [PATCH v2] docs/system/s390x: Improve the 3270 documentation Date: Mon, 13 Jul 2020 09:51:12 +0200 Message-Id: <20200713075112.442-1-thuth@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.120; envelope-from=thuth@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/13 03:20:22 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-s390x@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" There is some additional information about the 3270 support in our Wiki at https://wiki.qemu.org/Features/3270 - so let's include this information into the main documentation now to have one single source of information (the Wiki page could later be removed). While at it, I also shortened the lines of the first example a little bit. Otherwise they showed up with a horizontal scrollbar in my Firefox browser. Signed-off-by: Thomas Huth --- v2: - Added the changes that have been suggested by Cornelia - Talk about "Linux kernel" instead of just saying "kernel", just in case. docs/system/s390x/3270.rst | 43 ++++++++++++++++++++++++++++++++------ 1 file changed, 37 insertions(+), 6 deletions(-) diff --git a/docs/system/s390x/3270.rst b/docs/system/s390x/3270.rst index 1774cdcadf..36d1c96bfb 100644 --- a/docs/system/s390x/3270.rst +++ b/docs/system/s390x/3270.rst @@ -1,9 +1,15 @@ 3270 devices ============ -QEMU supports connecting an external 3270 terminal emulator (such as -``x3270``) to make a single 3270 device available to a guest. Note that this -supports basic features only. +The 3270 is the classic 'green-screen' console of the mainframes (see the +`IBM 3270 Wikipedia article `__). + +The 3270 data stream is not implemented within QEMU; the device only provides +TN3270 (a telnet extension; see `RFC 854 `__ +and `RFC 1576 `__) and leaves the heavy +lifting to an external 3270 terminal emulator (such as ``x3270``) to make a +single 3270 device available to a guest. Note that this supports basic +features only. To provide a 3270 device to a guest, create a ``x-terminal3270`` linked to a ``tn3270`` chardev. The guest will see a 3270 channel device. In order @@ -12,10 +18,14 @@ to actually be able to use it, attach the ``x3270`` emulator to the chardev. Example configuration --------------------- +* Make sure that 3270 support is enabled in the guest's Linux kernel. You need + ``CONFIG_TN3270`` and at least one of ``CONFIG_TN3270_TTY`` (for additional + ttys) or ``CONFIG_TN3270_CONSOLE`` (for a 3270 console). + * Add a ``tn3270`` chardev and a ``x-terminal3270`` to the QEMU command line:: - -chardev socket,id=char_0,host=0.0.0.0,port=2300,nowait,server,tn3270 - -device x-terminal3270,chardev=char_0,devno=fe.0.000a,id=terminal_0 + -chardev socket,id=ch0,host=0.0.0.0,port=2300,nowait,server,tn3270 + -device x-terminal3270,chardev=ch0,devno=fe.0.000a,id=terminal0 * Start the guest. In the guest, use ``chccwdev -e 0.0.000a`` to enable the device. @@ -29,4 +39,25 @@ Example configuration systemctl start serial-getty@3270-tty1.service -This should get you an addtional tty for logging into the guest. + This should get you an addtional tty for logging into the guest. + +* If you want to use the 3270 device as the Linux kernel console instead of + an additional tty, you can also append ``conmode=3270 condev=000a`` to + the guest's kernel command line. The kernel then should use the 3270 as + console after the next boot. + +Restrictions +------------ + +3270 support is very basic. In particular: + +* Only one 3270 device is supported. + +* It has only been tested with Linux guests and the x3270 emulator. + +* TLS/SSL is not supported. + +* Resizing on reattach is not supported. + +* Multiple commands in one inbound buffer (for example, when the reset key + is pressed while the network is slow) are not supported.