From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:33507) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gtodT-0003Tw-QD for qemu-devel@nongnu.org; Wed, 13 Feb 2019 02:07:12 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gtoQz-0003x4-Io for qemu-devel@nongnu.org; Wed, 13 Feb 2019 01:54:18 -0500 Received: from userp2120.oracle.com ([156.151.31.85]:55158) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gtoQz-0003w1-2X for qemu-devel@nongnu.org; Wed, 13 Feb 2019 01:54:17 -0500 From: Yuval Shaia Date: Wed, 13 Feb 2019 08:53:51 +0200 Message-Id: <20190213065357.16076-5-yuval.shaia@oracle.com> In-Reply-To: <20190213065357.16076-1-yuval.shaia@oracle.com> References: <20190213065357.16076-1-yuval.shaia@oracle.com> Subject: [Qemu-devel] [PATCH v2 3/9] hw/rdma: Protect against concurrent execution of poll_cq List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: dgilbert@redhat.com, yuval.shaia@oracle.com, marcel.apfelbaum@gmail.com, armbru@redhat.com, qemu-devel@nongnu.org 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 6e9c4617da..3a2913facf 100644 --- a/hw/rdma/rdma_backend.c +++ b/hw/rdma/rdma_backend.c @@ -70,6 +70,7 @@ static void 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); @@ -89,6 +90,7 @@ static void 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 64c6ea1a4e..7cc597cdc8 100644 --- a/hw/rdma/rdma_rm.c +++ b/hw/rdma/rdma_rm.c @@ -618,12 +618,16 @@ 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 0ba61d1838..f0ee1f3072 100644 --- a/hw/rdma/rdma_rm_defs.h +++ b/hw/rdma/rdma_rm_defs.h @@ -105,6 +105,7 @@ typedef struct RdmaDeviceResources { RdmaRmResTbl cq_tbl; RdmaRmResTbl cqe_ctx_tbl; GHashTable *qp_hash; /* Keeps mapping between real and emulated */ + QemuMutex lock; } RdmaDeviceResources; #endif -- 2.17.2