From patchwork Tue Apr 25 17:26:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 13223556 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.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 50986C77B7C for ; Tue, 25 Apr 2023 17:27:49 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.526175.817725 (Exim 4.92) (envelope-from ) id 1prMRy-0007P5-4d; Tue, 25 Apr 2023 17:27:34 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 526175.817725; Tue, 25 Apr 2023 17:27:34 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1prMRx-0007OU-VW; Tue, 25 Apr 2023 17:27:33 +0000 Received: by outflank-mailman (input) for mailman id 526175; Tue, 25 Apr 2023 17:27:33 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1prMRx-0006fQ-B3 for xen-devel@lists.xenproject.org; Tue, 25 Apr 2023 17:27:33 +0000 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 74f80a3c-e38e-11ed-b223-6b7b168915f2; Tue, 25 Apr 2023 19:27:31 +0200 (CEST) Received: from mimecast-mx02.redhat.com (mx3-rdu2.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-649-zygUM1aeMOCsWjm0lHqwCg-1; Tue, 25 Apr 2023 13:27:27 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 92D2A28082B1; Tue, 25 Apr 2023 17:27:26 +0000 (UTC) Received: from localhost (unknown [10.39.193.242]) by smtp.corp.redhat.com (Postfix) with ESMTP id A0ED82027043; Tue, 25 Apr 2023 17:27:25 +0000 (UTC) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 74f80a3c-e38e-11ed-b223-6b7b168915f2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1682443650; 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=ct1ICfub90ccCopLja+U3Sq9ZQX/65uvuN+fpfLMIoc=; b=EzqUA7UMmqv3z+VBzjQNsA72l2G4m4KEWGgIorpB/vNg/OdtCvsCI1wpRJDeTIN/dbjg1G 73ol2JnAa5Auqm481++Q4pL3CE2keE2W99drf9/hAGxcd4tXm+vReXj0O5//bIua0zl+no wWukRRzv5NF0b8bXwIIfi4KlJThBDIg= X-MC-Unique: zygUM1aeMOCsWjm0lHqwCg-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Juan Quintela , Julia Suvorova , Kevin Wolf , xen-devel@lists.xenproject.org, eesposit@redhat.com, Richard Henderson , Fam Zheng , "Michael S. Tsirkin" , Coiby Xu , David Woodhouse , Marcel Apfelbaum , Peter Lieven , Paul Durrant , Stefan Hajnoczi , "Richard W.M. Jones" , qemu-block@nongnu.org, Stefano Garzarella , Anthony Perard , Stefan Weil , Xie Yongji , Paolo Bonzini , Aarushi Mehta , =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?q?=C3=A9?= , Eduardo Habkost , Stefano Stabellini , Hanna Reitz , Ronnie Sahlberg , Daniil Tatianin Subject: [PATCH v4 03/20] virtio-scsi: avoid race between unplug and transport event Date: Tue, 25 Apr 2023 13:26:59 -0400 Message-Id: <20230425172716.1033562-4-stefanha@redhat.com> In-Reply-To: <20230425172716.1033562-1-stefanha@redhat.com> References: <20230425172716.1033562-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Only report a transport reset event to the guest after the SCSIDevice has been unrealized by qdev_simple_device_unplug_cb(). qdev_simple_device_unplug_cb() sets the SCSIDevice's qdev.realized field to false so that scsi_device_find/get() no longer see it. scsi_target_emulate_report_luns() also needs to be updated to filter out SCSIDevices that are unrealized. These changes ensure that the guest driver does not see the SCSIDevice that's being unplugged if it responds very quickly to the transport reset event. Reviewed-by: Paolo Bonzini Reviewed-by: Michael S. Tsirkin Reviewed-by: Daniil Tatianin Signed-off-by: Stefan Hajnoczi --- hw/scsi/scsi-bus.c | 3 ++- hw/scsi/virtio-scsi.c | 18 +++++++++--------- 2 files changed, 11 insertions(+), 10 deletions(-) diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c index 07275fb631..64d7311757 100644 --- a/hw/scsi/scsi-bus.c +++ b/hw/scsi/scsi-bus.c @@ -486,7 +486,8 @@ static bool scsi_target_emulate_report_luns(SCSITargetReq *r) DeviceState *qdev = kid->child; SCSIDevice *dev = SCSI_DEVICE(qdev); - if (dev->channel == channel && dev->id == id && dev->lun != 0) { + if (dev->channel == channel && dev->id == id && dev->lun != 0 && + qdev_is_realized(&dev->qdev)) { store_lun(tmp, dev->lun); g_byte_array_append(buf, tmp, 8); len += 8; diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c index 612c525d9d..000961446c 100644 --- a/hw/scsi/virtio-scsi.c +++ b/hw/scsi/virtio-scsi.c @@ -1063,15 +1063,6 @@ static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev, SCSIDevice *sd = SCSI_DEVICE(dev); AioContext *ctx = s->ctx ?: qemu_get_aio_context(); - if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { - virtio_scsi_acquire(s); - virtio_scsi_push_event(s, sd, - VIRTIO_SCSI_T_TRANSPORT_RESET, - VIRTIO_SCSI_EVT_RESET_REMOVED); - scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED)); - virtio_scsi_release(s); - } - aio_disable_external(ctx); qdev_simple_device_unplug_cb(hotplug_dev, dev, errp); aio_enable_external(ctx); @@ -1082,6 +1073,15 @@ static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev, blk_set_aio_context(sd->conf.blk, qemu_get_aio_context(), NULL); virtio_scsi_release(s); } + + if (virtio_vdev_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG)) { + virtio_scsi_acquire(s); + virtio_scsi_push_event(s, sd, + VIRTIO_SCSI_T_TRANSPORT_RESET, + VIRTIO_SCSI_EVT_RESET_REMOVED); + scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED)); + virtio_scsi_release(s); + } } static struct SCSIBusInfo virtio_scsi_scsi_info = {