diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/libvfio-user.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/libvfio-user.h b/include/libvfio-user.h index 8a4bfe7..de215ff 100644 --- a/include/libvfio-user.h +++ b/include/libvfio-user.h @@ -503,6 +503,17 @@ typedef struct { * * The callback should return -1 on error, setting errno. * + * When operating in non-blocking mode (LIBVFIO_USER_FLAG_ATTACH_NB was + * passed to vfu_create_ctx) and -1 is returned with errno set to EBUSY, + * transitioning to the new state becomes asynchronous: libvfio-user does + * not send a response to the client and does not process any new messages. + * Transitioning to the new device state is completed by calling + * vfu_migr_done. This behavior can be beneficial for devices whose + * threading model does not allow blocking. + * + * The user must not call functions vfu_dma_read or vfu_dma_write, doing so + * results in undefined behavior. + * * TODO rename to vfu_migration_state_transition_callback * FIXME maybe we should create a single callback and pass the state? */ @@ -569,6 +580,17 @@ typedef struct { } vfu_migration_callbacks_t; +/* + * Completes a pending migration state transition. Calling this function when + * there is no pending migration state transition results in undefined + * behavior. + * + * @vfu_ctx: the libvfio-user context + * @reply_errno: 0 for success or errno on error. + */ +void +vfu_migr_done(vfu_ctx_t *vfu_ctx, int reply_errno); + #ifndef VFIO_DEVICE_STATE_STOP |