From mboxrd@z Thu Jan 1 00:00:00 1970 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 95BD2C43334 for ; Mon, 4 Jul 2022 11:28:56 +0000 (UTC) Received: from localhost ([::1]:40734 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1o8KG7-0000vE-Oq for qemu-devel@archiver.kernel.org; Mon, 04 Jul 2022 07:28:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37742) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o8K6u-0004xP-AR for qemu-devel@nongnu.org; Mon, 04 Jul 2022 07:19:24 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:22835) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o8K6s-00069o-Ka for qemu-devel@nongnu.org; Mon, 04 Jul 2022 07:19:23 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1656933562; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BnIq8K47yRUPyVjixpm1UOHdRgzZNEmdcXAHpHp++ig=; b=a6hurD32VdQVUc4Z5dpU85IMSXBTA6d0RQtmAiSAGK7sxvLYbRbZz622MBk57HMrQckklk iBaFDRT676465FvXUSQF9zn+owcToSE80DNpKydOJ3OtOtouNX/VC9MEbIremVN6cfsI7h IgHrFPRuVyua6Xvsj3G/oLB/xrPazow= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-551-tFCr_UNGOZ6Lb7oyZXunjQ-1; Mon, 04 Jul 2022 07:19:19 -0400 X-MC-Unique: tFCr_UNGOZ6Lb7oyZXunjQ-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 75607811E80; Mon, 4 Jul 2022 11:19:18 +0000 (UTC) Received: from thuth.com (unknown [10.39.192.187]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1B3679D63; Mon, 4 Jul 2022 11:19:16 +0000 (UTC) From: Thomas Huth To: qemu-s390x@nongnu.org, Eric Farman Cc: qemu-devel@nongnu.org, Christian Borntraeger , Cornelia Huck Subject: [PATCH v2 06/12] pc-bios/s390-ccw/virtio: Set missing status bits while initializing Date: Mon, 4 Jul 2022 13:18:57 +0200 Message-Id: <20220704111903.62400-7-thuth@redhat.com> In-Reply-To: <20220704111903.62400-1-thuth@redhat.com> References: <20220704111903.62400-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, 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" According chapter "3.1.1 Driver Requirements: Device Initialization" of the Virtio specification (v1.1), a driver for a device has to set the ACKNOWLEDGE and DRIVER bits in the status field after resetting the device. The s390-ccw bios skipped these steps so far and seems like QEMU never cared. Anyway, it's better to follow the spec, so let's set these bits now in the right spots, too. Acked-by: Christian Borntraeger Reviewed-by: Cornelia Huck Reviewed-by: Eric Farman Signed-off-by: Thomas Huth --- pc-bios/s390-ccw/virtio.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c index 5d2c6e3381..4e85a2eb82 100644 --- a/pc-bios/s390-ccw/virtio.c +++ b/pc-bios/s390-ccw/virtio.c @@ -220,7 +220,7 @@ int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd) void virtio_setup_ccw(VDev *vdev) { int i, rc, cfg_size = 0; - unsigned char status = VIRTIO_CONFIG_S_DRIVER_OK; + uint8_t status; struct VirtioFeatureDesc { uint32_t features; uint8_t index; @@ -234,6 +234,10 @@ void virtio_setup_ccw(VDev *vdev) run_ccw(vdev, CCW_CMD_VDEV_RESET, NULL, 0, false); + status = VIRTIO_CONFIG_S_ACKNOWLEDGE; + rc = run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false); + IPL_assert(rc == 0, "Could not write ACKNOWLEDGE status to host"); + switch (vdev->senseid.cu_model) { case VIRTIO_ID_NET: vdev->nr_vqs = 2; @@ -253,6 +257,11 @@ void virtio_setup_ccw(VDev *vdev) default: panic("Unsupported virtio device\n"); } + + status |= VIRTIO_CONFIG_S_DRIVER; + rc = run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false); + IPL_assert(rc == 0, "Could not write DRIVER status to host"); + IPL_assert( run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size, false) == 0, "Could not get block device configuration"); @@ -291,9 +300,10 @@ void virtio_setup_ccw(VDev *vdev) run_ccw(vdev, CCW_CMD_SET_VQ, &info, sizeof(info), false) == 0, "Cannot set VQ info"); } - IPL_assert( - run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false) == 0, - "Could not write status to host"); + + status |= VIRTIO_CONFIG_S_DRIVER_OK; + rc = run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status), false); + IPL_assert(rc == 0, "Could not write DRIVER_OK status to host"); } bool virtio_is_supported(SubChannelId schid) -- 2.31.1