xsaves
xsaves(&xsave->xsave, XFEATURE_MASK_LBR);
xsaves(&task_ctx->xsave, XFEATURE_MASK_LBR);
void xsaves(struct xregs_state *xsave, u64 mask);
bool xsaves = cpu_feature_enabled(X86_FEATURE_XSAVES);
if (!xsaves && xfeature_is_supervisor(i)) {
vmx_adjust_sec_exec_feature(vmx, &exec_control, xsaves, XSAVES);