Function copy

vmm/src/uffd.rs:154–174

Resolve a page fault by copying data into the faulted address.

(fd: BorrowedFd<'_>, dst: u64, src: *const u8, len: u64)

/// Resolve a page fault by copying data into the faulted address.
pub(crate) fn copy(fd: BorrowedFd<'_>, dst: u64, src: *const u8, len: u64) -> Result<(), Error> {
    let mut cp = UffdioCopy {
        dst,
        src: src as u64,
        len,
        mode: 0,
        copy: 0,
    };
    // SAFETY: `cp` is a valid, correctly-sized struct for this ioctl.
    let ret = unsafe {
        libc::ioctl(
            fd.as_raw_fd(),
            userfaultfd::UFFDIO_COPY as libc::Ioctl,
            &mut cp,
        )
    };
    if ret < 0 {
        return Err(Error::last_os_error());
    }
    Ok(())
}

#[repr(C)]
struct UffdioRange {