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Thu, 12 Nov 2020 23:19:23 +0000 Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 0ACNJLDO026812; Thu, 12 Nov 2020 23:19:21 GMT Received: from ol2.localdomain (/73.88.28.6) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 12 Nov 2020 15:19:20 -0800 From: Mike Christie To: stefanha@redhat.com, qemu-devel@nongnu.org, fam@euphon.net, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, mst@redhat.com, jasowang@redhat.com, pbonzini@redhat.com, virtualization@lists.linux-foundation.org Subject: [PATCH 1/1] qemu vhost scsi: add VHOST_SET_VRING_ENABLE support Date: Thu, 12 Nov 2020 17:19:00 -0600 Message-Id: <1605223150-10888-2-git-send-email-michael.christie@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1605223150-10888-1-git-send-email-michael.christie@oracle.com> References: <1605223150-10888-1-git-send-email-michael.christie@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9803 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 spamscore=0 malwarescore=0 adultscore=0 phishscore=0 bulkscore=0 mlxlogscore=999 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011120130 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9803 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 priorityscore=1501 mlxscore=0 suspectscore=0 mlxlogscore=999 lowpriorityscore=0 spamscore=0 malwarescore=0 adultscore=0 clxscore=1015 bulkscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011120130 Received-SPF: pass client-ip=141.146.126.78; envelope-from=michael.christie@oracle.com; helo=aserp2120.oracle.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/12 15:44:20 X-ACL-Warn: Detected OS = Linux 3.1-3.10 [fuzzy] X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Thu, 12 Nov 2020 20:29:33 -0500 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch made over the master branch allows the vhost-scsi driver to call into the kernel and tell it to enable/disable a virtqueue. The kernel patches included with this set, will create a worker per IO vq when multiple IO queues have been setup. Signed-off-by: Mike Christie --- hw/scsi/vhost-scsi.c | 6 ++++++ hw/virtio/vhost-backend.c | 30 ++++++++++++++++++++++++++++++ linux-headers/linux/vhost.h | 1 + 3 files changed, 37 insertions(+) diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c index 4d70fa0..bbb2ba3 100644 --- a/hw/scsi/vhost-scsi.c +++ b/hw/scsi/vhost-scsi.c @@ -93,6 +93,12 @@ static int vhost_scsi_start(VHostSCSI *s) return ret; } + ret = vsc->dev.vhost_ops->vhost_set_vring_enable(&vsc->dev, 1); + if (ret) { + error_report("Error enabling vhost-scsi vqs %d", ret); + vhost_scsi_common_stop(vsc); + } + ret = vhost_scsi_set_endpoint(s); if (ret < 0) { error_report("Error setting vhost-scsi endpoint"); diff --git a/hw/virtio/vhost-backend.c b/hw/virtio/vhost-backend.c index 88c8ecc..e190c8e 100644 --- a/hw/virtio/vhost-backend.c +++ b/hw/virtio/vhost-backend.c @@ -102,6 +102,35 @@ static int vhost_kernel_set_mem_table(struct vhost_dev *dev, return vhost_kernel_call(dev, VHOST_SET_MEM_TABLE, mem); } +static int vhost_kernel_set_vring_enable(struct vhost_dev *dev, int enable) +{ + struct vhost_vring_state s; + int i, ret; + + s.num = 1; + for (i = 0; i < dev->nvqs; ++i) { + s.index = i; + + ret = vhost_kernel_call(dev, VHOST_SET_VRING_ENABLE, &s); + /* Ignore kernels that do not support the cmd */ + if (ret == -EPERM) + return 0; + if (ret) + goto disable_vrings; + } + + return 0; + +disable_vrings: + s.num = 0; + for (i--; i < dev->nvqs; ++i) { + s.index = i; + vhost_kernel_call(dev, VHOST_SET_VRING_ENABLE, &s); + } + + return ret; +} + static int vhost_kernel_set_vring_addr(struct vhost_dev *dev, struct vhost_vring_addr *addr) { @@ -302,6 +331,7 @@ static const VhostOps kernel_ops = { .vhost_scsi_get_abi_version = vhost_kernel_scsi_get_abi_version, .vhost_set_log_base = vhost_kernel_set_log_base, .vhost_set_mem_table = vhost_kernel_set_mem_table, + .vhost_set_vring_enable = vhost_kernel_set_vring_enable, .vhost_set_vring_addr = vhost_kernel_set_vring_addr, .vhost_set_vring_endian = vhost_kernel_set_vring_endian, .vhost_set_vring_num = vhost_kernel_set_vring_num, diff --git a/linux-headers/linux/vhost.h b/linux-headers/linux/vhost.h index 7523218..98dd919 100644 --- a/linux-headers/linux/vhost.h +++ b/linux-headers/linux/vhost.h @@ -70,6 +70,7 @@ #define VHOST_VRING_BIG_ENDIAN 1 #define VHOST_SET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x13, struct vhost_vring_state) #define VHOST_GET_VRING_ENDIAN _IOW(VHOST_VIRTIO, 0x14, struct vhost_vring_state) +#define VHOST_SET_VRING_ENABLE _IOW(VHOST_VIRTIO, 0x15, struct vhost_vring_state) /* The following ioctls use eventfd file descriptors to signal and poll * for events. */