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vhost-user: add VHOST_USER_SET_LOG_FD command

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VHOST_USER_SET_LOG_FD is an optional message with an eventfd
in ancillary data, it may be used to inform the front-end that the
log has been modified.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
[sbrivio: Fix comment to vu_set_log_fd_exec()]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Laurent Vivier 2024-12-19 12:13:54 +01:00 committed by Stefano Brivio
parent 6016e04a3a
commit b04195c60f
3 changed files with 59 additions and 0 deletions
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56
vhost_user.c
View File

@ -504,6 +504,57 @@ static bool vu_set_mem_table_exec(struct vu_dev *vdev,
return false;
}
/**
* vu_close_log() - Close the logging file descriptor
* @vdev: vhost-user device
*/
static void vu_close_log(struct vu_dev *vdev)
{
if (vdev->log_call_fd != -1) {
close(vdev->log_call_fd);
vdev->log_call_fd = -1;
}
}
/**
* vu_log_kick() - Inform the front-end that the log has been modified
* @vdev: vhost-user device
*/
/* cppcheck-suppress unusedFunction */
void vu_log_kick(const struct vu_dev *vdev)
{
if (vdev->log_call_fd != -1) {
int rc;
rc = eventfd_write(vdev->log_call_fd, 1);
if (rc == -1)
die_perror("vhost-user kick eventfd_write()");
}
}
/**
* vu_set_log_fd_exec() - Set the eventfd used to report logging update
* @vdev: vhost-user device
* @vmsg: vhost-user message
*
* Return: False as no reply is requested
*/
static bool vu_set_log_fd_exec(struct vu_dev *vdev,
struct vhost_user_msg *msg)
{
if (msg->fd_num != 1)
die("Invalid log_fd message");
if (vdev->log_call_fd != -1)
close(vdev->log_call_fd);
vdev->log_call_fd = msg->fds[0];
debug("Got log_call_fd: %d", vdev->log_call_fd);
return false;
}
/**
* vu_set_vring_num_exec() - Set the size of the queue (vring size)
* @vdev: vhost-user device
@ -864,8 +915,10 @@ void vu_init(struct ctx *c)
.notification = true,
};
}
c->vdev->log_call_fd = -1;
}
/**
* vu_cleanup() - Reset vhost-user device
* @vdev: vhost-user device
@ -909,6 +962,8 @@ void vu_cleanup(struct vu_dev *vdev)
}
}
vdev->nregions = 0;
vu_close_log(vdev);
}
/**
@ -929,6 +984,7 @@ static bool (*vu_handle[VHOST_USER_MAX])(struct vu_dev *vdev,
[VHOST_USER_GET_QUEUE_NUM] = vu_get_queue_num_exec,
[VHOST_USER_SET_OWNER] = vu_set_owner_exec,
[VHOST_USER_SET_MEM_TABLE] = vu_set_mem_table_exec,
[VHOST_USER_SET_LOG_FD] = vu_set_log_fd_exec,
[VHOST_USER_SET_VRING_NUM] = vu_set_vring_num_exec,
[VHOST_USER_SET_VRING_ADDR] = vu_set_vring_addr_exec,
[VHOST_USER_SET_VRING_BASE] = vu_set_vring_base_exec,

1
vhost_user.h
View File

@ -240,5 +240,6 @@ static inline bool vu_queue_started(const struct vu_virtq *vq)
void vu_print_capabilities(void);
void vu_init(struct ctx *c);
void vu_cleanup(struct vu_dev *vdev);
void vu_log_kick(const struct vu_dev *vdev);
void vu_control_handler(struct vu_dev *vdev, int fd, uint32_t events);
#endif /* VHOST_USER_H */

2
virtio.h
View File

@ -103,6 +103,7 @@ struct vu_dev_region {
* @regions: Guest shared memory regions
* @features: Vhost-user features
* @protocol_features: Vhost-user protocol features
* @log_call_fd: Eventfd to report logging update
*/
struct vu_dev {
struct ctx *context;
@ -111,6 +112,7 @@ struct vu_dev {
struct vu_virtq vq[VHOST_USER_MAX_QUEUES];
uint64_t features;
uint64_t protocol_features;
int log_call_fd;
};
/**