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bh=a9YCFYBe/wtK2m20SEqqnM/xkwczPqhlKI9voVD+mLY=; b=WHw36vyMynh4NYGc+hyhUa72QObRxAr6WovqCTBUIZCbhaCpLfXIq8cua7s6i4CXsfcQir 4CdO8g4+42veufa7wCJ8cEmg/PYsBnpZqxbpYGnnxiGLqUQDPGs1hHyGY9vkqISglYT/Tu Nawr04dmqt/ICC419EvQlXn3FGoDbkQ= X-MC-Unique: MacXL3UjMqiVYip6G14u2g-1 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, stefanha@redhat.com, qemu-devel@nongnu.org Subject: [PULL 16/33] scsi: assert that callbacks run in the correct AioContext Date: Thu, 21 Dec 2023 22:23:21 +0100 Message-ID: <20231221212339.164439-17-kwolf@redhat.com> In-Reply-To: <20231221212339.164439-1-kwolf@redhat.com> References: <20231221212339.164439-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.8 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=170.10.133.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.061, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1703193888288100003 Content-Type: text/plain; charset="utf-8" From: Stefan Hajnoczi Since the removal of AioContext locking, the correctness of the code relies on running requests from a single AioContext at any given time. Add assertions that verify that callbacks are invoked in the correct AioContext. Signed-off-by: Stefan Hajnoczi Message-ID: <20231205182011.1976568-3-stefanha@redhat.com> Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- hw/scsi/scsi-disk.c | 14 ++++++++++++++ system/dma-helpers.c | 3 +++ 2 files changed, 17 insertions(+) diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c index 2c1bbb3530..a5048e0aaf 100644 --- a/hw/scsi/scsi-disk.c +++ b/hw/scsi/scsi-disk.c @@ -273,6 +273,10 @@ static void scsi_aio_complete(void *opaque, int ret) SCSIDiskReq *r =3D (SCSIDiskReq *)opaque; SCSIDiskState *s =3D DO_UPCAST(SCSIDiskState, qdev, r->req.dev); =20 + /* The request must only run in the BlockBackend's AioContext */ + assert(blk_get_aio_context(s->qdev.conf.blk) =3D=3D + qemu_get_current_aio_context()); + assert(r->req.aiocb !=3D NULL); r->req.aiocb =3D NULL; =20 @@ -370,8 +374,13 @@ static void scsi_dma_complete(void *opaque, int ret) =20 static void scsi_read_complete_noio(SCSIDiskReq *r, int ret) { + SCSIDiskState *s =3D DO_UPCAST(SCSIDiskState, qdev, r->req.dev); uint32_t n; =20 + /* The request must only run in the BlockBackend's AioContext */ + assert(blk_get_aio_context(s->qdev.conf.blk) =3D=3D + qemu_get_current_aio_context()); + assert(r->req.aiocb =3D=3D NULL); if (scsi_disk_req_check_error(r, ret, false)) { goto done; @@ -496,8 +505,13 @@ static void scsi_read_data(SCSIRequest *req) =20 static void scsi_write_complete_noio(SCSIDiskReq *r, int ret) { + SCSIDiskState *s =3D DO_UPCAST(SCSIDiskState, qdev, r->req.dev); uint32_t n; =20 + /* The request must only run in the BlockBackend's AioContext */ + assert(blk_get_aio_context(s->qdev.conf.blk) =3D=3D + qemu_get_current_aio_context()); + assert (r->req.aiocb =3D=3D NULL); if (scsi_disk_req_check_error(r, ret, false)) { goto done; diff --git a/system/dma-helpers.c b/system/dma-helpers.c index 528117f256..9b221cf94e 100644 --- a/system/dma-helpers.c +++ b/system/dma-helpers.c @@ -119,6 +119,9 @@ static void dma_blk_cb(void *opaque, int ret) =20 trace_dma_blk_cb(dbs, ret); =20 + /* DMAAIOCB is not thread-safe and must be accessed only from dbs->ctx= */ + assert(ctx =3D=3D qemu_get_current_aio_context()); + dbs->acb =3D NULL; dbs->offset +=3D dbs->iov.size; =20 --=20 2.43.0