Struct UffdPageSource 

pub struct UffdPageSource { /* private fields */ }

Uffd-backed page source. Talks to a page-server on a UDS in the upstream-Firecracker wire shape (see § 5.1).

Wire shape (squib’s; mirrors upstream’s userfaultfd request shape):

request:  <u64 LE: ipa>
          <u64 LE: page_size>
response: <u64 LE: ipa>
          <u64 LE: page_size>
          <bytes: page payload, length == page_size>

The connection is parking_lot::Mutex-serialised so concurrent fault threads can share one UDS without interleaving requests.

Implementations

impl UffdPageSource

pub fn connect(path: &Path) -> Result<Self, PageSourceError>

Connect to the page-server’s UDS.

Errors

PageSourceError::Open if connect fails.

pub fn path(&self) -> &Path

Path of the UDS this source is connected to.

Trait Implementations

impl Debug for UffdPageSource

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

Formats the value using the given formatter.

impl PageSource for UffdPageSource

fn fetch(&self, req: &PageRequest) -> Result<Bytes, PageSourceError>

Return the bytes for req.ipa rounded down to its req.page_size boundary.