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Thu, 31 Jan 2019 13:09:07 GMT Received: from localhost.localdomain (/77.138.186.148) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 31 Jan 2019 05:09:06 -0800 From: Yuval Shaia To: dgilbert@redhat.com, yuval.shaia@oracle.com, marcel.apfelbaum@gmail.com, armbru@redhat.com, qemu-devel@nongnu.org Date: Thu, 31 Jan 2019 15:08:44 +0200 Message-Id: <20190131130850.6850-5-yuval.shaia@oracle.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20190131130850.6850-1-yuval.shaia@oracle.com> References: <20190131130850.6850-1-yuval.shaia@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9152 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1901310103 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 156.151.31.85 Subject: [Qemu-devel] [PATCH 04/10] hw/rdma: Protect against concurrent execution of poll_cq X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP The function rdma_poll_cq is called from two contexts - completion handler thread which sense new completion on backend channel and explicitly as result of guest issuing poll_cq command. Add lock to protect against concurrent executions. Signed-off-by: Yuval Shaia Reviewed-by: Marcel Apfelbaum --- hw/rdma/rdma_backend.c | 2 ++ hw/rdma/rdma_rm.c | 4 ++++ hw/rdma/rdma_rm_defs.h | 1 + 3 files changed, 7 insertions(+) diff --git a/hw/rdma/rdma_backend.c b/hw/rdma/rdma_backend.c index b7d6afb5da..bf8e889144 100644 --- a/hw/rdma/rdma_backend.c +++ b/hw/rdma/rdma_backend.c @@ -70,6 +70,7 @@ static int rdma_poll_cq(RdmaDeviceResources *rdma_dev_res, struct ibv_cq *ibcq) BackendCtx *bctx; struct ibv_wc wc[2]; + qemu_mutex_lock(&rdma_dev_res->lock); do { ne = ibv_poll_cq(ibcq, ARRAY_SIZE(wc), wc); @@ -90,6 +91,7 @@ static int rdma_poll_cq(RdmaDeviceResources *rdma_dev_res, struct ibv_cq *ibcq) g_free(bctx); } } while (ne > 0); + qemu_mutex_unlock(&rdma_dev_res->lock); if (ne < 0) { rdma_error_report("ibv_poll_cq fail, rc=%d, errno=%d", ne, errno); diff --git a/hw/rdma/rdma_rm.c b/hw/rdma/rdma_rm.c index 1ba77ac42c..9408bfb751 100644 --- a/hw/rdma/rdma_rm.c +++ b/hw/rdma/rdma_rm.c @@ -619,12 +619,16 @@ int rdma_rm_init(RdmaDeviceResources *dev_res, struct ibv_device_attr *dev_attr, init_ports(dev_res); + qemu_mutex_init(&dev_res->lock); + return 0; } void rdma_rm_fini(RdmaDeviceResources *dev_res, RdmaBackendDev *backend_dev, const char *ifname) { + qemu_mutex_destroy(&dev_res->lock); + fini_ports(dev_res, backend_dev, ifname); res_tbl_free(&dev_res->uc_tbl); diff --git a/hw/rdma/rdma_rm_defs.h b/hw/rdma/rdma_rm_defs.h index 08692e87d4..9e98565a28 100644 --- a/hw/rdma/rdma_rm_defs.h +++ b/hw/rdma/rdma_rm_defs.h @@ -109,6 +109,7 @@ typedef struct RdmaDeviceResources { RdmaRmResTbl cq_tbl; RdmaRmResTbl cqe_ctx_tbl; GHashTable *qp_hash; /* Keeps mapping between real and emulated */ + QemuMutex lock; } RdmaDeviceResources; #endif