Struct KvmNestedStateBuffer

#[non_exhaustive]
#[repr(C)]
pub struct KvmNestedStateBuffer {
    pub flags: u16,
    pub format: u16,
    pub size: u32,
    pub hdr: kvm_nested_state__bindgen_ty_1,
    pub data: kvm_nested_state__data,
}

A stack-allocated buffer for nested KVM state including the mandatory header with meta-information.

KVM uses a dynamically sized buffer structure (with a header reporting the size of the buffer/state). This helper type makes working with get_nested_state() and set_nested_state() significantly more convenient at the cost of a slightly higher memory footprint in some cases.

Type Size

On Intel VMX, the actual state requires 128 + 8192 == 8320 bytes, on AMD SVM, the actual state requires 128 + 4096 == 4224 bytes. This type doesn’t make a differentiation and unifies the required memory. By sacrificing a few more bytes on VMX, this type is generally convenient to use.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

flags: u16

format: u16

size: u32

hdr: kvm_nested_state__bindgen_ty_1

data: kvm_nested_state__data

Implementations

impl KvmNestedStateBuffer

pub fn empty() -> KvmNestedStateBuffer

Creates a new empty buffer, ready for nested state to be stored in by KVM.

The size property will report the size of the buffer to KVM.

Trait Implementations

impl Clone for KvmNestedStateBuffer

fn clone(&self) -> KvmNestedStateBuffer

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for KvmNestedStateBuffer

fn default() -> KvmNestedStateBuffer

Returns the “default value” for a type.

impl Copy for KvmNestedStateBuffer