machina_virtio_device

Struct GuestBellTrap

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pub struct GuestBellTrap<T = ReceiverRegistration<PortForwarder>> { /* private fields */ }
Expand description

Wrapper for receiving bell traps from the guest.

A bell trap from the guest is a signal that a particular virtqueue needs to be processed. Bell traps are delivered by the kernel as packets on a port. This wrapper registers itself on the current executors port and provides an asynchronous [Stream] of queues that have been notified.

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impl GuestBellTrap

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pub fn new(guest: &Guest, base: GPAddr, len: usize) -> Result<Self, Status>

Construct a GuestBellTrap for the provided guest range.

If a device is using bell traps then the trap information is in the [StartInfo] (fidl_fuchsia_virtualization_hardware::StartInfo). A reference to the zx::Guest is only needed temporarily to register the trap range.

Note that traps cannot be unregistered and creating a second GuestBellTrap for the same range, even after dropping the first one, will fail.

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impl<T> GuestBellTrap<T>

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pub fn queue_for_addr(&self, addr: GPAddr) -> Option<u16>

Convert a guest address to a queue.

Returns a none if the provided addr is not within the trap range. Otherwise if a queue is returned the caller still needs to validate that it is for a queue that was actually configured and exists.

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impl<T: Unpin> GuestBellTrap<T>

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pub async fn complete<'a, N>( self, device: &Device<'a, N>, ) -> Result<(), DeviceError>

Consume all traps by notifying the provided Device.

This method will only yield a value if there is an error, either due to the stream ending or an invalid queue.

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pub async fn complete_or_pending<'a, N>( maybe_trap: Option<Self>, device: &Device<'a, N>, ) -> Result<(), DeviceError>

[complete] a GuestBellTrap or block forever.

Bell traps are not always provided to a device and this provides a unified way of interacting with them. It will either run [complete] on the provided bell trap, or block permanently. In this way it is similar to [complete] in that it only resolves to a value on error, and the absence of a bell trap is not considered an error.

Trait Implementations§

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impl<T: Debug> Debug for GuestBellTrap<T>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T: Unpin> Stream for GuestBellTrap<T>

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type Item = Result<u16, BellError>

Values yielded by the stream.
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fn poll_next( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Option<Self::Item>>

Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted. Read more
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fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the stream. Read more

Auto Trait Implementations§

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impl<T> Freeze for GuestBellTrap<T>
where T: Freeze,

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impl<T = ReceiverRegistration<PortForwarder>> !RefUnwindSafe for GuestBellTrap<T>

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impl<T> Send for GuestBellTrap<T>
where T: Send,

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impl<T> Sync for GuestBellTrap<T>
where T: Sync,

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impl<T> Unpin for GuestBellTrap<T>
where T: Unpin,

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impl<T = ReceiverRegistration<PortForwarder>> !UnwindSafe for GuestBellTrap<T>

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T, D> Encode<Ambiguous1, D> for T
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unsafe fn encode( self, _encoder: &mut Encoder<'_, D>, _offset: usize, _depth: Depth, ) -> Result<(), Error>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID. Read more
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impl<T, D> Encode<Ambiguous2, D> for T
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unsafe fn encode( self, _encoder: &mut Encoder<'_, D>, _offset: usize, _depth: Depth, ) -> Result<(), Error>

Encodes the object into the encoder’s buffers. Any handles stored in the object are swapped for Handle::INVALID. Read more
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const ALIGN: usize = _

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type Init = T

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impl<T> StreamExt for T
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fn next(&mut self) -> Next<'_, Self>
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where F: FnMut(&Self::Item) -> Fut, Fut: Future<Output = bool>, Self: Sized,

Filters the values produced by this stream according to the provided asynchronous predicate. Read more
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fn filter_map<Fut, T, F>(self, f: F) -> FilterMap<Self, Fut, F>
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Filters the values produced by this stream while simultaneously mapping them to a different type according to the provided asynchronous closure. Read more
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fn any<Fut, F>(self, f: F) -> Any<Self, Fut, F>
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fn all<Fut, F>(self, f: F) -> All<Self, Fut, F>
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fn flatten(self) -> Flatten<Self>
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Flattens a stream of streams into just one continuous stream. Read more
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Flattens a stream of streams into just one continuous stream. Polls inner streams produced by the base stream concurrently. Read more
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fn flat_map<U, F>(self, f: F) -> FlatMap<Self, U, F>
where F: FnMut(Self::Item) -> U, U: Stream, Self: Sized,

Maps a stream like [StreamExt::map] but flattens nested Streams. Read more
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fn flat_map_unordered<U, F>( self, limit: impl Into<Option<usize>>, f: F, ) -> FlatMapUnordered<Self, U, F>
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fn scan<S, B, Fut, F>(self, initial_state: S, f: F) -> Scan<Self, S, Fut, F>
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Combinator similar to [StreamExt::fold] that holds internal state and produces a new stream. Read more
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fn skip_while<Fut, F>(self, f: F) -> SkipWhile<Self, Fut, F>
where F: FnMut(&Self::Item) -> Fut, Fut: Future<Output = bool>, Self: Sized,

Skip elements on this stream while the provided asynchronous predicate resolves to true. Read more
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fn take_while<Fut, F>(self, f: F) -> TakeWhile<Self, Fut, F>
where F: FnMut(&Self::Item) -> Fut, Fut: Future<Output = bool>, Self: Sized,

Take elements from this stream while the provided asynchronous predicate resolves to true. Read more
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fn take_until<Fut>(self, fut: Fut) -> TakeUntil<Self, Fut>
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fn for_each<Fut, F>(self, f: F) -> ForEach<Self, Fut, F>
where F: FnMut(Self::Item) -> Fut, Fut: Future<Output = ()>, Self: Sized,

Runs this stream to completion, executing the provided asynchronous closure for each element on the stream. Read more
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fn for_each_concurrent<Fut, F>( self, limit: impl Into<Option<usize>>, f: F, ) -> ForEachConcurrent<Self, Fut, F>
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Runs this stream to completion, executing the provided asynchronous closure for each element on the stream concurrently as elements become available. Read more
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fn take(self, n: usize) -> Take<Self>
where Self: Sized,

Creates a new stream of at most n items of the underlying stream. Read more
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fn skip(self, n: usize) -> Skip<Self>
where Self: Sized,

Creates a new stream which skips n items of the underlying stream. Read more
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fn fuse(self) -> Fuse<Self>
where Self: Sized,

Fuse a stream such that poll_next will never again be called once it has finished. This method can be used to turn any Stream into a FusedStream. Read more
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fn by_ref(&mut self) -> &mut Self

Borrows a stream, rather than consuming it. Read more
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fn catch_unwind(self) -> CatchUnwind<Self>
where Self: Sized + UnwindSafe,

Catches unwinding panics while polling the stream. Read more
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fn boxed<'a>(self) -> Pin<Box<dyn Stream<Item = Self::Item> + Send + 'a>>
where Self: Sized + Send + 'a,

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fn buffered(self, n: usize) -> Buffered<Self>
where Self::Item: Future, Self: Sized,

An adaptor for creating a buffered list of pending futures. Read more
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fn buffer_unordered(self, n: usize) -> BufferUnordered<Self>
where Self::Item: Future, Self: Sized,

An adaptor for creating a buffered list of pending futures (unordered). Read more
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fn zip<St>(self, other: St) -> Zip<Self, St>
where St: Stream, Self: Sized,

An adapter for zipping two streams together. Read more
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fn chain<St>(self, other: St) -> Chain<Self, St>
where St: Stream<Item = Self::Item>, Self: Sized,

Adapter for chaining two streams. Read more
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fn peekable(self) -> Peekable<Self>
where Self: Sized,

Creates a new stream which exposes a peek method. Read more
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fn chunks(self, capacity: usize) -> Chunks<Self>
where Self: Sized,

An adaptor for chunking up items of the stream inside a vector. Read more
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fn ready_chunks(self, capacity: usize) -> ReadyChunks<Self>
where Self: Sized,

An adaptor for chunking up ready items of the stream inside a vector. Read more
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fn forward<S>(self, sink: S) -> Forward<Self, S>
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fn split<Item>(self) -> (SplitSink<Self, Item>, SplitStream<Self>)
where Self: Sized + Sink<Item>,

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fn inspect<F>(self, f: F) -> Inspect<Self, F>
where F: FnMut(&Self::Item), Self: Sized,

Do something with each item of this stream, afterwards passing it on. Read more
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fn left_stream<B>(self) -> Either<Self, B>
where B: Stream<Item = Self::Item>, Self: Sized,

Wrap this stream in an Either stream, making it the left-hand variant of that Either. Read more
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fn right_stream<B>(self) -> Either<B, Self>
where B: Stream<Item = Self::Item>, Self: Sized,

Wrap this stream in an Either stream, making it the right-hand variant of that Either. Read more
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fn poll_next_unpin(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::Item>>
where Self: Unpin,

A convenience method for calling [Stream::poll_next] on Unpin stream types.
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fn select_next_some(&mut self) -> SelectNextSome<'_, Self>
where Self: Unpin + FusedStream,

Returns a Future that resolves when the next item in this stream is ready. Read more
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type Error = Infallible

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type Error = <U as TryFrom<T>>::Error

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impl<S, T, E> TryStream for S
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type Ok = T

The type of successful values yielded by this future
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type Error = E

The type of failures yielded by this future
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fn try_poll_next( self: Pin<&mut S>, cx: &mut Context<'_>, ) -> Poll<Option<Result<<S as TryStream>::Ok, <S as TryStream>::Error>>>

Poll this TryStream as if it were a Stream. Read more
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impl<S> TryStreamExt for S
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fn err_into<E>(self) -> ErrInto<Self, E>
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Wraps the current stream in a new stream which converts the error type into the one provided. Read more
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fn map_ok<T, F>(self, f: F) -> MapOk<Self, F>
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Wraps the current stream in a new stream which maps the success value using the provided closure. Read more
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fn map_err<E, F>(self, f: F) -> MapErr<Self, F>
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fn and_then<Fut, F>(self, f: F) -> AndThen<Self, Fut, F>
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Chain on a computation for when a value is ready, passing the successful results to the provided closure f. Read more
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fn or_else<Fut, F>(self, f: F) -> OrElse<Self, Fut, F>
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Chain on a computation for when an error happens, passing the erroneous result to the provided closure f. Read more
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fn inspect_ok<F>(self, f: F) -> InspectOk<Self, F>
where F: FnMut(&Self::Ok), Self: Sized,

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fn inspect_err<F>(self, f: F) -> InspectErr<Self, F>
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Do something with the error value of this stream, afterwards passing it on. Read more
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fn into_stream(self) -> IntoStream<Self>
where Self: Sized,

Wraps a [TryStream] into a type that implements Stream Read more
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fn try_next(&mut self) -> TryNext<'_, Self>
where Self: Unpin,

Creates a future that attempts to resolve the next item in the stream. If an error is encountered before the next item, the error is returned instead. Read more
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fn try_for_each<Fut, F>(self, f: F) -> TryForEach<Self, Fut, F>
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fn try_skip_while<Fut, F>(self, f: F) -> TrySkipWhile<Self, Fut, F>
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Skip elements on this stream while the provided asynchronous predicate resolves to true. Read more
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fn try_take_while<Fut, F>(self, f: F) -> TryTakeWhile<Self, Fut, F>
where F: FnMut(&Self::Ok) -> Fut, Fut: TryFuture<Ok = bool, Error = Self::Error>, Self: Sized,

Take elements on this stream while the provided asynchronous predicate resolves to true. Read more
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fn try_for_each_concurrent<Fut, F>( self, limit: impl Into<Option<usize>>, f: F, ) -> TryForEachConcurrent<Self, Fut, F>
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fn try_chunks(self, capacity: usize) -> TryChunks<Self>
where Self: Sized,

An adaptor for chunking up successful items of the stream inside a vector. Read more
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fn try_ready_chunks(self, capacity: usize) -> TryReadyChunks<Self>
where Self: Sized,

An adaptor for chunking up successful, ready items of the stream inside a vector. Read more
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fn try_filter<Fut, F>(self, f: F) -> TryFilter<Self, Fut, F>
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fn try_filter_map<Fut, F, T>(self, f: F) -> TryFilterMap<Self, Fut, F>
where Fut: TryFuture<Ok = Option<T>, Error = Self::Error>, F: FnMut(Self::Ok) -> Fut, Self: Sized,

Attempt to filter the values produced by this stream while simultaneously mapping them to a different type according to the provided asynchronous closure. Read more
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fn try_flatten_unordered( self, limit: impl Into<Option<usize>>, ) -> TryFlattenUnordered<Self>
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fn try_flatten(self) -> TryFlatten<Self>
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fn try_fold<T, Fut, F>(self, init: T, f: F) -> TryFold<Self, Fut, T, F>
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Attempt to execute an accumulating asynchronous computation over a stream, collecting all the values into one final result. Read more
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fn try_concat(self) -> TryConcat<Self>
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fn try_buffer_unordered(self, n: usize) -> TryBufferUnordered<Self>
where Self::Ok: TryFuture<Error = Self::Error>, Self: Sized,

Attempt to execute several futures from a stream concurrently (unordered). Read more
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fn try_buffered(self, n: usize) -> TryBuffered<Self>
where Self::Ok: TryFuture<Error = Self::Error>, Self: Sized,

Attempt to execute several futures from a stream concurrently. Read more
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fn try_poll_next_unpin( &mut self, cx: &mut Context<'_>, ) -> Poll<Option<Result<Self::Ok, Self::Error>>>
where Self: Unpin,

A convenience method for calling [TryStream::try_poll_next] on Unpin stream types.
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fn into_async_read(self) -> IntoAsyncRead<Self>
where Self: Sized + TryStreamExt<Error = Error>, Self::Ok: AsRef<[u8]>,

Adapter that converts this stream into an AsyncBufRead. Read more
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fn try_all<Fut, F>(self, f: F) -> TryAll<Self, Fut, F>
where Self: Sized, F: FnMut(Self::Ok) -> Fut, Fut: Future<Output = bool>,

Attempt to execute a predicate over an asynchronous stream and evaluate if all items satisfy the predicate. Exits early if an Err is encountered or if an Ok item is found that does not satisfy the predicate. Read more
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fn try_any<Fut, F>(self, f: F) -> TryAny<Self, Fut, F>
where Self: Sized, F: FnMut(Self::Ok) -> Fut, Fut: Future<Output = bool>,

Attempt to execute a predicate over an asynchronous stream and evaluate if any items satisfy the predicate. Exits early if an Err is encountered or if an Ok item is found that satisfies the predicate. Read more
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

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