__pkvm_host_unshare_ffa
int __pkvm_host_unshare_ffa(u64 pfn, u64 nr_pages);
if (__pkvm_host_unshare_ffa(pfn, sz / PAGE_SIZE))
assert_transition_res(-EPERM, __pkvm_host_unshare_ffa, pfn, 1);
assert_transition_res(-EPERM, __pkvm_host_unshare_ffa, pfn, 1);
assert_transition_res(0, __pkvm_host_unshare_ffa, pfn, 1);
assert_transition_res(-EPERM, __pkvm_host_unshare_ffa, pfn, 1);