gmap_pv_destroy_range
int gmap_pv_destroy_range(struct gmap *gmap, gfn_t start, gfn_t end, bool interruptible);
gmap_pv_destroy_range(kvm->arch.gmap, 0, gpa_to_gfn(SZ_2G), false);
gmap_pv_destroy_range(kvm->arch.gmap, 0, asce_end(kvm->arch.gmap->asce), false);
if (gmap_pv_destroy_range(kvm->arch.gmap, 0, asce_end(kvm->arch.gmap->asce), true))