From patchwork Thu May 20 17:05:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cornelia Huck X-Patchwork-Id: 12271037 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 EBB88C433B4 for ; Thu, 20 May 2021 17:11:01 +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 9DE8461279 for ; Thu, 20 May 2021 17:11:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9DE8461279 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]:39912 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ljmCK-0005Cx-Po for qemu-devel@archiver.kernel.org; Thu, 20 May 2021 13:11:00 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43026) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ljm7Q-0001lF-Cz for qemu-devel@nongnu.org; Thu, 20 May 2021 13:05:57 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:35947) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ljm7C-0005cV-QH for qemu-devel@nongnu.org; Thu, 20 May 2021 13:05:56 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1621530341; 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=rbiqi95N3t0FvUT2LJ86516tFEPkNtui8jyogJ6FhZU=; b=b24hn0N8Pk3ZFMmlfydUqgOkcCipnqMykvCc9cz1Lqxu2C+QQluG6ae58qu8xsA2kbNaNJ G7uget0uIgduU4E1FBQtA7m0mZ4ZFneTPaQNOCqEh2B4T6/qhp7ez4GP5ubAT5uBsh34F/ KJAwivxS/MpVDmvdKw9juL3MWnMl3QY= 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-331-Egqz84dQMPuk6jo6wJJKcQ-1; Thu, 20 May 2021 13:05:38 -0400 X-MC-Unique: Egqz84dQMPuk6jo6wJJKcQ-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 AC79B1020C2E; Thu, 20 May 2021 17:05:37 +0000 (UTC) Received: from gondolin.fritz.box (ovpn-113-166.ams2.redhat.com [10.36.113.166]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8844D5D6D5; Thu, 20 May 2021 17:05:36 +0000 (UTC) From: Cornelia Huck To: Peter Maydell Subject: [PULL v2 5/9] vfio-ccw: Permit missing IRQs Date: Thu, 20 May 2021 19:05:15 +0200 Message-Id: <20210520170519.300951-6-cohuck@redhat.com> In-Reply-To: <20210520170519.300951-1-cohuck@redhat.com> References: <20210520170519.300951-1-cohuck@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 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=216.205.24.124; envelope-from=cohuck@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.39, 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=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: Eric Farman , qemu-s390x@nongnu.org, Cornelia Huck , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Eric Farman Commit 690e29b91102 ("vfio-ccw: Refactor ccw irq handler") changed one of the checks for the IRQ notifier registration from saying "the host needs to recognize the only IRQ that exists" to saying "the host needs to recognize ANY IRQ that exists." And this worked fine, because the subsequent change to support the CRW IRQ notifier doesn't get into this code when running on an older kernel, thanks to a guard by a capability region. The later addition of the REQ(uest) IRQ by commit b2f96f9e4f5f ("vfio-ccw: Connect the device request notifier") broke this assumption because there is no matching capability region. Thus, running new QEMU on an older kernel fails with: vfio: unexpected number of irqs 2 Let's adapt the message here so that there's a better clue of what IRQ is missing. Furthermore, let's make the REQ(uest) IRQ not fail when attempting to register it, to permit running vfio-ccw on a newer QEMU with an older kernel. Fixes: b2f96f9e4f5f ("vfio-ccw: Connect the device request notifier") Signed-off-by: Eric Farman Message-Id: <20210421152053.2379873-1-farman@linux.ibm.com> Signed-off-by: Cornelia Huck --- hw/vfio/ccw.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c index e752c845e9e4..7c058d13e8ce 100644 --- a/hw/vfio/ccw.c +++ b/hw/vfio/ccw.c @@ -411,8 +411,8 @@ static void vfio_ccw_register_irq_notifier(VFIOCCWDevice *vcdev, } if (vdev->num_irqs < irq + 1) { - error_setg(errp, "vfio: unexpected number of irqs %u", - vdev->num_irqs); + error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)", + irq, vdev->num_irqs); return; } @@ -695,13 +695,15 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp) vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX, &err); if (err) { - goto out_req_notifier_err; + /* + * Report this error, but do not make it a failing condition. + * Lack of this IRQ in the host does not prevent normal operation. + */ + error_report_err(err); } return; -out_req_notifier_err: - vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX); out_crw_notifier_err: vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX); out_io_notifier_err: