From patchwork Tue Feb 16 11:18:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cornelia Huck X-Patchwork-Id: 12089853 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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 9271FC433DB for ; Tue, 16 Feb 2021 11:19:50 +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 ECB8764DA1 for ; Tue, 16 Feb 2021 11:19:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ECB8764DA1 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]:41074 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lByOS-0007Rz-Sb for qemu-devel@archiver.kernel.org; Tue, 16 Feb 2021 06:19:48 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:59668) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lByNQ-0006ji-Jn for qemu-devel@nongnu.org; Tue, 16 Feb 2021 06:18:44 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:44432) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1lByNP-00032X-2S for qemu-devel@nongnu.org; Tue, 16 Feb 2021 06:18:44 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1613474321; 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; bh=uDr4FTpvQisEb8hwxE8gmqBCD54211TI9LU+oF1Yyds=; b=aF0lT9FBfhYcqWlNT/8R9oJ8aeR3mtGKdSeb9X4yiO54Z6AfylcvKXP4paTeH8aYg3wsWj rRCGxADE5V1wnMN5B3W3najoItWM01xa6wirlWQ7bgG2dBDp3iOxICbOd072MAY85kzMSF PQUekFSl/Cr56/5Hg5Wvue5UAXEyw7w= 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-462-8wpJeQoEOL6TjKNiCvEVNQ-1; Tue, 16 Feb 2021 06:18:39 -0500 X-MC-Unique: 8wpJeQoEOL6TjKNiCvEVNQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 672D010CE782; Tue, 16 Feb 2021 11:18:38 +0000 (UTC) Received: from gondolin.redhat.com (ovpn-113-145.ams2.redhat.com [10.36.113.145]) by smtp.corp.redhat.com (Postfix) with ESMTP id 88B951970A; Tue, 16 Feb 2021 11:18:32 +0000 (UTC) From: Cornelia Huck To: Halil Pasic Subject: [PATCH] virtio-ccw: commands on revision-less devices Date: Tue, 16 Feb 2021 12:18:30 +0100 Message-Id: <20210216111830.1087847-1-cohuck@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=cohuck@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=63.128.21.124; envelope-from=cohuck@redhat.com; helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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: Thomas Huth , "Michael S. Tsirkin" , Cornelia Huck , qemu-devel@nongnu.org, Christian Borntraeger , qemu-s390x@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The virtio standard specifies that any non-transitional device must reject commands prior to revision setting (which we do) and else assume revision 0 (legacy) if the driver sends a non-revision-setting command first. We neglected to do the latter. Fortunately, nearly everything worked as intended anyway; the only problem was not properly rejecting revision setting after some other command had been issued. Easy to fix by setting revision to 0 if we see a non-revision command on a legacy-capable revision-less device. Signed-off-by: Cornelia Huck Reviewed-by: Thomas Huth Reviewed-by: Michael S. Tsirkin Acked-by: Halil Pasic Acked-by: Michael S. Tsirkin --- hw/s390x/virtio-ccw.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c index 4582e94ae7dc..06c06056814b 100644 --- a/hw/s390x/virtio-ccw.c +++ b/hw/s390x/virtio-ccw.c @@ -327,13 +327,20 @@ static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) ccw.cmd_code); check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC)); - if (dev->force_revision_1 && dev->revision < 0 && - ccw.cmd_code != CCW_CMD_SET_VIRTIO_REV) { - /* - * virtio-1 drivers must start with negotiating to a revision >= 1, - * so post a command reject for all other commands - */ - return -ENOSYS; + if (dev->revision < 0 && ccw.cmd_code != CCW_CMD_SET_VIRTIO_REV) { + if (dev->force_revision_1) { + /* + * virtio-1 drivers must start with negotiating to a revision >= 1, + * so post a command reject for all other commands + */ + return -ENOSYS; + } else { + /* + * If the driver issues any command that is not SET_VIRTIO_REV, + * we'll have to operate the device in legacy mode. + */ + dev->revision = 0; + } } /* Look at the command. */