From nobody Wed Nov 27 13:31:04 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1731134593297597.1144203080976; Fri, 8 Nov 2024 22:43:13 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t9f8U-0003Su-Tb; Sat, 09 Nov 2024 01:39:56 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t9f8C-00035N-LA; Sat, 09 Nov 2024 01:39:40 -0500 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t9f89-00020j-Hq; Sat, 09 Nov 2024 01:39:35 -0500 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id E586DA12EF; Sat, 9 Nov 2024 09:38:09 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id 4DAF9167DD3; Sat, 9 Nov 2024 09:39:04 +0300 (MSK) Received: (nullmailer pid 3272515 invoked by uid 1000); Sat, 09 Nov 2024 06:39:03 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Stefano Garzarella , Thomas Huth , Paolo Bonzini , Michael Tokarev Subject: [Stable-7.2.15 08/33] scsi: fetch unit attention when creating the request Date: Sat, 9 Nov 2024 09:38:34 +0300 Message-Id: <20241109063903.3272404-8-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.5 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1731134593784116600 Content-Type: text/plain; charset="utf-8" From: Stefano Garzarella Commit 1880ad4f4e ("virtio-scsi: Batched prepare for cmd reqs") split calls to scsi_req_new() and scsi_req_enqueue() in the virtio-scsi device. No ill effects were observed until commit 8cc5583abe ("virtio-scsi: Send "REPORTED LUNS CHANGED" sense data upon disk hotplug events") added a unit attention that was easy to trigger with device hotplug and hot-unplug. Because the two calls were separated, all requests in the batch were prepared calling scsi_req_new() to report a sense. The first one submitted would report the right sense and reset it to NO_SENSE, while the others reported CHECK_CONDITION with no sense data. This caused SCSI errors in Linux. To solve this issue, let's fetch the unit attention as early as possible when we prepare the request, so that only the first request in the batch will use the unit attention SCSIReqOps and the others will not report CHECK CONDITION. Fixes: 1880ad4f4e ("virtio-scsi: Batched prepare for cmd reqs") Fixes: 8cc5583abe ("virtio-scsi: Send "REPORTED LUNS CHANGED" sense data up= on disk hotplug events") Reported-by: Thomas Huth Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=3D2176702 Co-developed-by: Paolo Bonzini Signed-off-by: Stefano Garzarella Message-ID: <20230712134352.118655-2-sgarzare@redhat.com> Signed-off-by: Paolo Bonzini (cherry picked from commit 9472083e642bfb9bc836b38662baddd9bc964ebc) Signed-off-by: Michael Tokarev diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c index e5c9f7a53d..e76bfbd47b 100644 --- a/hw/scsi/scsi-bus.c +++ b/hw/scsi/scsi-bus.c @@ -413,19 +413,35 @@ static const struct SCSIReqOps reqops_invalid_opcode = =3D { =20 /* SCSIReqOps implementation for unit attention conditions. */ =20 -static int32_t scsi_unit_attention(SCSIRequest *req, uint8_t *buf) +static void scsi_fetch_unit_attention_sense(SCSIRequest *req) { + SCSISense *ua =3D NULL; + if (req->dev->unit_attention.key =3D=3D UNIT_ATTENTION) { - scsi_req_build_sense(req, req->dev->unit_attention); + ua =3D &req->dev->unit_attention; } else if (req->bus->unit_attention.key =3D=3D UNIT_ATTENTION) { - scsi_req_build_sense(req, req->bus->unit_attention); + ua =3D &req->bus->unit_attention; } + + /* + * Fetch the unit attention sense immediately so that another + * scsi_req_new does not use reqops_unit_attention. + */ + if (ua) { + scsi_req_build_sense(req, *ua); + *ua =3D SENSE_CODE(NO_SENSE); + } +} + +static int32_t scsi_unit_attention(SCSIRequest *req, uint8_t *buf) +{ scsi_req_complete(req, CHECK_CONDITION); return 0; } =20 static const struct SCSIReqOps reqops_unit_attention =3D { .size =3D sizeof(SCSIRequest), + .init_req =3D scsi_fetch_unit_attention_sense, .send_command =3D scsi_unit_attention }; =20 @@ -699,6 +715,11 @@ SCSIRequest *scsi_req_alloc(const SCSIReqOps *reqops, = SCSIDevice *d, object_ref(OBJECT(d)); object_ref(OBJECT(qbus->parent)); notifier_list_init(&req->cancel_notifiers); + + if (reqops->init_req) { + reqops->init_req(req); + } + trace_scsi_req_alloc(req->dev->id, req->lun, req->tag); return req; } @@ -798,6 +819,15 @@ uint8_t *scsi_req_get_buf(SCSIRequest *req) static void scsi_clear_unit_attention(SCSIRequest *req) { SCSISense *ua; + + /* + * scsi_fetch_unit_attention_sense() already cleaned the unit attention + * in this case. + */ + if (req->ops =3D=3D &reqops_unit_attention) { + return; + } + if (req->dev->unit_attention.key !=3D UNIT_ATTENTION && req->bus->unit_attention.key !=3D UNIT_ATTENTION) { return; diff --git a/include/hw/scsi/scsi.h b/include/hw/scsi/scsi.h index 6ea4b64fe7..60bc32da32 100644 --- a/include/hw/scsi/scsi.h +++ b/include/hw/scsi/scsi.h @@ -108,6 +108,7 @@ int cdrom_read_toc_raw(int nb_sectors, uint8_t *buf, in= t msf, int session_num); /* scsi-bus.c */ struct SCSIReqOps { size_t size; + void (*init_req)(SCSIRequest *req); void (*free_req)(SCSIRequest *req); int32_t (*send_command)(SCSIRequest *req, uint8_t *buf); void (*read_data)(SCSIRequest *req); --=20 2.39.5