Struct HostXstate 

pub struct HostXstate {
    pub vendor: [u32; 3],
    pub signature: u32,
    pub xcr0: u64,
    pub xsave_leaves: Vec<[u32; 5]>,
    pub xcomp_supp: u64,
    pub xcomp_perm: u64,
    pub xcomp_guest_perm: u64,
    pub xfeature_max: u32,
    pub probe_cases: u32,
    pub probe_forced_exit: bool,
}

The host facts a v3 guest’s CPUID and xstate answers are built from, captured once at startup on a host that passed the qualification, and bound into a recording so that replay refuses a host where any of them differs.

On the ptrace backend a guest’s XGETBV and XSAVE run on the host, so leaf 0xD must describe the host’s XCR0 and save layout; everything else in the v3 table is fixed.

Fields

vendor: [u32; 3]

CPUID leaf 0 EBX, EDX, ECX: the vendor string.

signature: u32

CPUID leaf 1 EAX: family, model and stepping.

xcr0: u64

XCR0, as XGETBV(0) reads it.

xsave_leaves: Vec<[u32; 5]>

The host’s CPUID leaf 0xD rows the guest table is built from, as [subleaf, eax, ebx, ecx, edx]: subleaf 0 and each enabled component from 2 up, in order.

xcomp_supp: u64

arch_prctl ARCH_GET_XCOMP_SUPP, ARCH_GET_XCOMP_PERM and ARCH_GET_XCOMP_GUEST_PERM.

xcomp_perm: u64

xcomp_guest_perm: u64

xfeature_max: u32

The first component index ARCH_REQ_XCOMP_PERM answers EINVAL for (Linux’s XFEATURE_MAX); below it the answer is EOPNOTSUPP.

probe_cases: u32

The qualification this host passed: its case count and whether the forced-exit arm ran.

probe_forced_exit: bool

Implementations

impl HostXstate

pub fn xsave_leaf(&self, subleaf: u32) -> Option<[u32; 4]>

The host’s leaf 0xD row for subleaf, if it was captured.

Trait Implementations

impl Clone for HostXstate

fn clone(&self) -> HostXstate

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HostXstate

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for HostXstate

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for HostXstate

impl Hash for HostXstate

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for HostXstate

fn eq(&self, other: &HostXstate) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for HostXstate

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for HostXstate