Type Alias kvm_bindings::Xsave

pub type Xsave = FamStructWrapper<kvm_xsave2>;

Available on crate feature fam-wrappers and x86-64 only.

Wrapper over the post-5.17 kvm_xsave structure.

In linux 5.17, kvm_xsave got turned into a FamStruct by adding the flexible “extra” member to its definition. However, unlike all other such structs, it does not contain a “length” field. Instead, the length of the flexible array member has to be determined by querying the KVM_CAP_XSAVE2 capability. This requires access to a VM file descriptor, and thus cannot happen in the FamStruct::len trait method. To work around this, we define a wrapper struct that caches the length of a previous KVM_CHECK_EXTENSION(KVM_CAP_XSAVE2) call, and implement FamStruct for this wrapper. Then in kvm-ioctls, we can expose a function that first queries KVM_CAP_XSAVE2, then invokes [KVM_GET_XSAVE2] to retrives the kvm_xsave structure, and finally combine them into the kvm_xsave2 helper structure to be managed as a FamStruct.

Aliased Type

struct Xsave { /* private fields */ }