diff options
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/virtio/vhost-user.c | 118 | ||||
| -rw-r--r-- | hw/virtio/vhost.c | 32 |
2 files changed, 150 insertions, 0 deletions
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 093675e..8b94688 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, @@ -65,12 +70,15 @@ 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_MAX } VhostUserRequest; typedef enum VhostUserSlaveRequest { VHOST_USER_SLAVE_NONE = 0, VHOST_USER_SLAVE_IOTLB_MSG = 1, + VHOST_USER_SLAVE_CONFIG_CHANGE_MSG = 2, VHOST_USER_SLAVE_MAX } VhostUserSlaveRequest; @@ -92,6 +100,18 @@ typedef struct VhostUserLog { uint64_t mmap_offset; } VhostUserLog; +typedef struct VhostUserConfig { + uint32_t offset; + uint32_t size; + uint32_t flags; + uint8_t region[VHOST_USER_MAX_CONFIG_SIZE]; +} VhostUserConfig; + +static VhostUserConfig c __attribute__ ((unused)); +#define VHOST_USER_CONFIG_HDR_SIZE (sizeof(c.offset) \ + + sizeof(c.size) \ + + sizeof(c.flags)) + typedef struct VhostUserMsg { VhostUserRequest request; @@ -109,6 +129,7 @@ typedef struct VhostUserMsg { VhostUserMemory memory; VhostUserLog log; struct vhost_iotlb_msg iotlb; + VhostUserConfig config; } payload; } QEMU_PACKED VhostUserMsg; @@ -608,6 +629,21 @@ static int vhost_user_reset_device(struct vhost_dev *dev) return 0; } +static int vhost_user_slave_handle_config_change(struct vhost_dev *dev) +{ + int ret = -1; + + if (!dev->config_ops) { + return -1; + } + + if (dev->config_ops->vhost_dev_config_notifier) { + ret = dev->config_ops->vhost_dev_config_notifier(dev); + } + + return ret; +} + static void slave_read(void *opaque) { struct vhost_dev *dev = opaque; @@ -640,6 +676,9 @@ static void slave_read(void *opaque) case VHOST_USER_SLAVE_IOTLB_MSG: ret = vhost_backend_handle_iotlb_msg(dev, &msg.payload.iotlb); break; + case VHOST_USER_SLAVE_CONFIG_CHANGE_MSG : + ret = vhost_user_slave_handle_config_change(dev); + break; default: error_report("Received unexpected msg type."); ret = -EINVAL; @@ -922,6 +961,83 @@ 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, + uint32_t config_len) +{ + VhostUserMsg msg = { + msg.request = VHOST_USER_GET_CONFIG, + msg.flags = VHOST_USER_VERSION, + msg.size = VHOST_USER_CONFIG_HDR_SIZE + config_len, + }; + + if (config_len > VHOST_USER_MAX_CONFIG_SIZE) { + return -1; + } + + msg.payload.config.offset = 0; + msg.payload.config.size = config_len; + 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 != VHOST_USER_CONFIG_HDR_SIZE + config_len) { + 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 *data, + uint32_t offset, uint32_t size, uint32_t flags) +{ + uint8_t *p; + bool reply_supported = virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_REPLY_ACK); + + VhostUserMsg msg = { + msg.request = VHOST_USER_SET_CONFIG, + msg.flags = VHOST_USER_VERSION, + msg.size = VHOST_USER_CONFIG_HDR_SIZE + size, + }; + + if (reply_supported) { + msg.flags |= VHOST_USER_NEED_REPLY_MASK; + } + + if (size > VHOST_USER_MAX_CONFIG_SIZE) { + return -1; + } + + msg.payload.config.offset = offset, + msg.payload.config.size = size, + msg.payload.config.flags = flags, + p = msg.payload.config.region; + memcpy(p, data, size); + + if (vhost_user_write(dev, &msg, NULL, 0) < 0) { + return -1; + } + + if (reply_supported) { + return process_message_reply(dev, &msg); + } + + return 0; +} + const VhostOps user_ops = { .backend_type = VHOST_BACKEND_TYPE_USER, .vhost_backend_init = vhost_user_init, @@ -948,4 +1064,6 @@ 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, }; diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index e4290ce..386aef8 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -1505,6 +1505,38 @@ void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits, } } +int vhost_dev_get_config(struct vhost_dev *hdev, uint8_t *config, + uint32_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 -1; +} + +int vhost_dev_set_config(struct vhost_dev *hdev, const uint8_t *data, + uint32_t offset, uint32_t size, uint32_t flags) +{ + assert(hdev->vhost_ops); + + if (hdev->vhost_ops->vhost_set_config) { + return hdev->vhost_ops->vhost_set_config(hdev, data, offset, + size, flags); + } + + return -1; +} + +void vhost_dev_set_config_notifier(struct vhost_dev *hdev, + const VhostDevConfigOps *ops) +{ + assert(hdev->vhost_ops); + hdev->config_ops = ops; +} + /* Host notifiers must be enabled at this point. */ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev) { |