Struct VirtQueueDesc 

#[repr(C)]
pub struct VirtQueueDesc {
    pub base_addr: GuestPhysAddr,
    pub len: u32,
    pub flags: u16,
    pub next: u16,
}

VirtIO queue descriptor structure.

This structure represents the memory layout of a single descriptor in the descriptor table according to the VirtIO specification. It is a C-compatible data structure that directly maps to guest memory.

Each descriptor describes a buffer in guest memory that can be used for device I/O operations. Descriptors can be chained together using the NEXT flag to describe scatter-gather buffers.

This structure is used by DescriptorTable to read/write individual descriptors in guest memory through the guest memory accessor.

Fields

base_addr: GuestPhysAddr

Address (guest-physical)

len: u32

Length

flags: u16

Flags

next: u16

Next descriptor index (if VIRTQ_DESC_F_NEXT is set)

Implementations

impl VirtQueueDesc

pub fn new(base_addr: GuestPhysAddr, len: u32, flags: u16, next: u16) -> Self

Create a new descriptor

pub fn has_next(&self) -> bool

Check if this descriptor has the NEXT flag

pub fn is_write(&self) -> bool

Check if this descriptor is writable

pub fn is_indirect(&self) -> bool

Check if this descriptor is indirect

pub fn guest_addr(&self) -> GuestPhysAddr

Get the guest physical address

pub fn set_next(&mut self, has_next: bool)

Set the next flag

pub fn set_write(&mut self, is_write: bool)

Set the write flag

pub fn set_write_only(&mut self, is_write: bool)

Set the write flag (alias for compatibility)

pub fn is_write_only(&self) -> bool

Check if this descriptor is write-only (alias for compatibility)

pub fn set_indirect(&mut self, is_indirect: bool)

Set the indirect flag

Trait Implementations

impl Clone for VirtQueueDesc

fn clone(&self) -> VirtQueueDesc

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for VirtQueueDesc

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

Formats the value using the given formatter.

impl Copy for VirtQueueDesc