This patch implements the .vhost_set_virtio_status() backend callback for user backend by intooducing a new vhost-user VHOST_USER_SET_VIRTIO_STATUS request.
Suggested-by: Stefan Hajnoczi <stefa...@redhat.com> Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com> --- docs/interop/vhost-user.txt | 14 ++++++++++++++ hw/virtio/vhost-user.c | 35 +++++++++++++++++++++++++++++++++++ 2 files changed, 49 insertions(+) diff --git a/docs/interop/vhost-user.txt b/docs/interop/vhost-user.txt index 9fcf48d611..daa452bd36 100644 --- a/docs/interop/vhost-user.txt +++ b/docs/interop/vhost-user.txt @@ -368,6 +368,7 @@ Protocol features #define VHOST_USER_PROTOCOL_F_MTU 4 #define VHOST_USER_PROTOCOL_F_SLAVE_REQ 5 #define VHOST_USER_PROTOCOL_F_CROSS_ENDIAN 6 +#define VHOST_USER_PROTOCOL_F_VIRTIO_STATUS 7 Master message types -------------------- @@ -663,6 +664,19 @@ Master message types field, and slaves MUST NOT accept SET_CONFIG for read-only configuration space fields unless the live migration bit is set. +* VHOST_USER_SET_VIRTIO_STATUS + + Id: 26 + Equivalent ioctl: N/A + Master payload: u64 + Slave payload: N/A + + Sent by the vhost-user master to notify of virtio device status change. + The payload is a u64 representing the virtio device status as defined in + the virtio specification. + The request should be sent only when VHOST_USER_PROTOCOL_F_VIRTIO_STATUS + protocol feature has been negotiated. + Slave message types ------------------- diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 6eb97980ad..519646799b 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -39,6 +39,7 @@ enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_NET_MTU = 4, VHOST_USER_PROTOCOL_F_SLAVE_REQ = 5, VHOST_USER_PROTOCOL_F_CROSS_ENDIAN = 6, + VHOST_USER_PROTOCOL_F_VIRTIO_STATUS = 7, VHOST_USER_PROTOCOL_F_MAX }; @@ -72,6 +73,7 @@ typedef enum VhostUserRequest { VHOST_USER_SET_VRING_ENDIAN = 23, VHOST_USER_GET_CONFIG = 24, VHOST_USER_SET_CONFIG = 25, + VHOST_USER_SET_VIRTIO_STATUS = 26, VHOST_USER_MAX } VhostUserRequest; @@ -1054,6 +1056,38 @@ static int vhost_user_set_config(struct vhost_dev *dev, const uint8_t *data, return 0; } +static int vhost_user_set_virtio_status(struct vhost_dev *dev, uint8_t status) +{ + bool reply_supported = virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_REPLY_ACK); + + VhostUserMsg msg = { + .hdr.request = VHOST_USER_SET_VIRTIO_STATUS, + .hdr.flags = VHOST_USER_VERSION, + .hdr.size = sizeof(msg.payload.u64), + .payload.u64 = status, + }; + + if (!virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_VIRTIO_STATUS)) { + return 0; + } + + if (reply_supported) { + msg.hdr.flags |= VHOST_USER_NEED_REPLY_MASK; + } + + 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, @@ -1082,4 +1116,5 @@ const VhostOps user_ops = { .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_virtio_status = vhost_user_set_virtio_status, }; -- 2.14.3