[v5,1/4] vhost-user: add new vhost user messages to support virtio config space

Message ID	1510865080-32027-2-git-send-email-changpeng.liu@intel.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org> From: Changpeng Liu <changpeng.liu@intel.com> To: changpeng.liu@intel.com, qemu-devel@nongnu.org Date: Fri, 17 Nov 2017 04:44:37 +0800 Message-Id: <1510865080-32027-2-git-send-email-changpeng.liu@intel.com> In-Reply-To: <1510865080-32027-1-git-send-email-changpeng.liu@intel.com> References: <1510865080-32027-1-git-send-email-changpeng.liu@intel.com> Subject: [Qemu-devel] [PATCH v5 1/4] vhost-user: add new vhost user messages to support virtio config space Precedence: list Cc: james.r.harris@intel.com, mst@redhat.com, stefanha@gmail.com, pbonzini@redhat.com, felipe@nutanix.com, marcandre.lureau@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" <qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org>

diff --git a/docs/interop/vhost-user.txt b/docs/interop/vhost-user.txt index 954771d..1b98388 100644 --- a/docs/interop/vhost-user.txt +++ b/docs/interop/vhost-user.txt @@ -116,6 +116,16 @@ Depending on the request type, payload can be: - 3: IOTLB invalidate - 4: IOTLB access fail + * Virtio device config space + --------------------------- + | offset | size | payload | + --------------------------- + + Offset: a 32-bit offset of virtio device's configuration space + Size: a 32-bit size of configuration space that master wanted to change + Payload: a 256-bytes array holding the contents of the virtio + device's configuration space + In QEMU the vhost-user message is implemented with the following struct: typedef struct VhostUserMsg { @@ -129,6 +139,7 @@ typedef struct VhostUserMsg { VhostUserMemory memory; VhostUserLog log; struct vhost_iotlb_msg iotlb; + VhostUserConfig config; }; } QEMU_PACKED VhostUserMsg; @@ -596,6 +607,34 @@ Master message types and expect this message once (per VQ) during device configuration (ie. before the master starts the VQ). + * VHOST_USER_GET_CONFIG + Id: 24 + Equivalent ioctl: N/A + Master payload: virtio device config space + + Submitted by the vhost-user master to fetch the contents of the virtio + device configuration space. The vhost-user master may cache the contents + to avoid repeated VHOST_USER_GET_CONFIG calls. + +* VHOST_USER_SET_CONFIG + Id: 25 + Equivalent ioctl: N/A + Master payload: virtio device config space + + Submitted by the vhost-user master when the Guest changes the virtio + device configuration space and also can be used for live migration + on the destination host. + +* VHOST_USER_SET_CONFIG_FD + Id: 26 + Equivalent ioctl: N/A + Master payload: N/A + + Sets the notifier file descriptor, which is passed as ancillary data. + The vhost-user slave uses the file descriptor to notify the vhost-user + master of changes to the virtio configuration space. The vhost-user + master can read the virtio configuration space to get the latest update. + Slave message types ------------------- diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 093675e..ef1687b 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -26,6 +26,11 @@ #define VHOST_MEMORY_MAX_NREGIONS 8 #define VHOST_USER_F_PROTOCOL_FEATURES 30 +/* + * Maximum size of virtio device config space + */ +#define VHOST_USER_MAX_CONFIG_SIZE 256 + enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_MQ = 0, VHOST_USER_PROTOCOL_F_LOG_SHMFD = 1, @@ -65,6 +70,9 @@ typedef enum VhostUserRequest { VHOST_USER_SET_SLAVE_REQ_FD = 21, VHOST_USER_IOTLB_MSG = 22, VHOST_USER_SET_VRING_ENDIAN = 23, + VHOST_USER_GET_CONFIG = 24, + VHOST_USER_SET_CONFIG = 25, + VHOST_USER_SET_CONFIG_FD = 26, VHOST_USER_MAX } VhostUserRequest; @@ -92,6 +100,12 @@ typedef struct VhostUserLog { uint64_t mmap_offset; } VhostUserLog; +typedef struct VhostUserConfig { + uint32_t offset; + uint32_t size; + uint8_t region[VHOST_USER_MAX_CONFIG_SIZE]; +} VhostUserConfig; + typedef struct VhostUserMsg { VhostUserRequest request; @@ -109,6 +123,7 @@ typedef struct VhostUserMsg { VhostUserMemory memory; VhostUserLog log; struct vhost_iotlb_msg iotlb; + VhostUserConfig config; } payload; } QEMU_PACKED VhostUserMsg; @@ -922,6 +937,86 @@ static void vhost_user_set_iotlb_callback(struct vhost_dev *dev, int enabled) /* No-op as the receive channel is not dedicated to IOTLB messages. */ } +static int vhost_user_get_config(struct vhost_dev *dev, uint8_t *config, + size_t config_len) +{ + VhostUserMsg msg = { + .request = VHOST_USER_GET_CONFIG, + .flags = VHOST_USER_VERSION, + .size = sizeof(msg.payload.config), + }; + + if (vhost_user_write(dev, &msg, NULL, 0) < 0) { + return -1; + } + + if (vhost_user_read(dev, &msg) < 0) { + return -1; + } + + if (msg.request != VHOST_USER_GET_CONFIG) { + error_report("Received unexpected msg type. Expected %d received %d", + VHOST_USER_GET_CONFIG, msg.request); + return -1; + } + + if (msg.size != sizeof(msg.payload.config)) { + error_report("Received bad msg size."); + return -1; + } + + memcpy(config, msg.payload.config.region, config_len); + + return 0; +} + +static int vhost_user_set_config(struct vhost_dev *dev, const uint8_t *config, + uint32_t offset, uint32_t size) +{ + uint8_t *p; + bool reply_supported = virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_REPLY_ACK); + + VhostUserMsg msg = { + .request = VHOST_USER_SET_CONFIG, + .flags = VHOST_USER_VERSION, + .size = sizeof(msg.payload.config), + }; + + if (reply_supported) { + msg.flags |= VHOST_USER_NEED_REPLY_MASK; + } + + msg.payload.config.offset = offset; + msg.payload.config.size = size; + p = msg.payload.config.region; + memcpy(p + offset, config + offset, size); + + if (vhost_user_write(dev, &msg, NULL, 0) < 0) { + return -1; + } + + if (reply_supported) { + return process_message_reply(dev, &msg); + } + + return 0; +} + +static int vhost_user_set_config_fd(struct vhost_dev *dev, int fd) +{ + VhostUserMsg msg = { + .request = VHOST_USER_SET_CONFIG_FD, + .flags = VHOST_USER_VERSION, + }; + + if (vhost_user_write(dev, &msg, &fd, 1) < 0) { + return -1; + } + + return 0; +} + const VhostOps user_ops = { .backend_type = VHOST_BACKEND_TYPE_USER, .vhost_backend_init = vhost_user_init, @@ -948,4 +1043,7 @@ const VhostOps user_ops = { .vhost_net_set_mtu = vhost_user_net_set_mtu, .vhost_set_iotlb_callback = vhost_user_set_iotlb_callback, .vhost_send_device_iotlb_msg = vhost_user_send_device_iotlb_msg, + .vhost_get_config = vhost_user_get_config, + .vhost_set_config = vhost_user_set_config, + .vhost_set_config_fd = vhost_user_set_config_fd, }; diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index ddc42f0..744ca85 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -1354,6 +1354,9 @@ void vhost_dev_cleanup(struct vhost_dev *hdev) for (i = 0; i < hdev->nvqs; ++i) { vhost_virtqueue_cleanup(hdev->vqs + i); } + if (hdev->config_ops) { + event_notifier_cleanup(&hdev->config_notifier); + } if (hdev->mem) { /* those are only safe after successful init */ memory_listener_unregister(&hdev->memory_listener); @@ -1501,6 +1504,66 @@ void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, } } +int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config, + size_t config_len) +{ + assert(hdev->vhost_ops); + + if (hdev->vhost_ops->vhost_get_config) { + return hdev->vhost_ops->vhost_get_config(hdev, config, config_len); + } + + return 0; +} + +int vhost_dev_set_config(struct vhost_dev *hdev, const uint8_t *config, + uint32_t offset, uint32_t size) +{ + assert(hdev->vhost_ops); + + if (hdev->vhost_ops->vhost_set_config) { + return hdev->vhost_ops->vhost_set_config(hdev, config, offset, size); + } + + return 0; +} + +static void vhost_dev_config_notifier_read(EventNotifier *n) +{ + struct vhost_dev *hdev = container_of(n, struct vhost_dev, + config_notifier); + + if (event_notifier_test_and_clear(n)) { + if (hdev->config_ops) { + hdev->config_ops->vhost_dev_config_notifier(hdev); + } + } +} + +int vhost_dev_set_config_notifier(struct vhost_dev *hdev, + const VhostDevConfigOps *ops) +{ + int r, fd; + + assert(hdev->vhost_ops); + + r = event_notifier_init(&hdev->config_notifier, 0); + if (r < 0) { + return r; + } + + hdev->config_ops = ops; + event_notifier_set_handler(&hdev->config_notifier, + vhost_dev_config_notifier_read); + + if (hdev->vhost_ops->vhost_set_config_fd) { + fd = event_notifier_get_fd(&hdev->config_notifier); + return hdev->vhost_ops->vhost_set_config_fd(hdev, fd); + } + + return 0; +} + /* Host notifiers must be enabled at this point. */ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) { diff --git a/include/hw/virtio/vhost-backend.h b/include/hw/virtio/vhost-backend.h index a7a5f22..3ab0b79 100644 --- a/include/hw/virtio/vhost-backend.h +++ b/include/hw/virtio/vhost-backend.h @@ -84,6 +84,11 @@ typedef void (*vhost_set_iotlb_callback_op)(struct vhost_dev *dev, int enabled); typedef int (*vhost_send_device_iotlb_msg_op)(struct vhost_dev *dev, struct vhost_iotlb_msg *imsg); +typedef int (*vhost_set_config_op)(struct vhost_dev *dev, const uint8_t *config, + uint32_t offset, uint32_t size); +typedef int (*vhost_get_config_op)(struct vhost_dev *dev, uint8_t *config, + size_t config_len); +typedef int (*vhost_set_config_fd_op)(struct vhost_dev *dev, int fd); typedef struct VhostOps { VhostBackendType backend_type; @@ -118,6 +123,9 @@ typedef struct VhostOps { vhost_vsock_set_running_op vhost_vsock_set_running; vhost_set_iotlb_callback_op vhost_set_iotlb_callback; vhost_send_device_iotlb_msg_op vhost_send_device_iotlb_msg; + vhost_get_config_op vhost_get_config; + vhost_set_config_op vhost_set_config; + vhost_set_config_fd_op vhost_set_config_fd; } VhostOps; extern const VhostOps user_ops; diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h index 467dc77..593056d 100644 --- a/include/hw/virtio/vhost.h +++ b/include/hw/virtio/vhost.h @@ -46,6 +46,12 @@ struct vhost_iommu { QLIST_ENTRY(vhost_iommu) iommu_next; }; +typedef struct VhostDevConfigOps { + /* Vhost device config space changed callback + */ + void (*vhost_dev_config_notifier)(struct vhost_dev *dev); +} VhostDevConfigOps; + struct vhost_memory; struct vhost_dev { VirtIODevice *vdev; @@ -76,6 +82,8 @@ struct vhost_dev { QLIST_ENTRY(vhost_dev) entry; QLIST_HEAD(, vhost_iommu) iommu_list; IOMMUNotifier n; + EventNotifier config_notifier; + const VhostDevConfigOps *config_ops; }; int vhost_dev_init(struct vhost_dev *hdev, void *opaque, @@ -106,4 +114,12 @@ int vhost_net_set_backend(struct vhost_dev *hdev, struct vhost_vring_file *file); int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write); +int vhost_dev_get_config(struct vhost_dev *dev, uint8_t *config, + size_t config_len); +int vhost_dev_set_config(struct vhost_dev *dev, const uint8_t *config, + uint32_t offset, uint32_t size); +/* notifier callback in case vhost device config space changed + */ +int vhost_dev_set_config_notifier(struct vhost_dev *dev, + const VhostDevConfigOps *ops); #endif

[v5,1/4] vhost-user: add new vhost user messages to support virtio config space

Commit Message

Comments

Patch