[PATCH v2 14/18] KVM: arm64: Use noclear for PGD in __pkvm_init_vm error path

[Vincent Donnefort]

In the error path of __pkvm_init_vm(), use unmap_donated_memory_noclear()
instead of the clearing variant to release the donated stage-2 PGD back
to the host.

This intends to eliminate the clearing variant of
unmap_donated_memory(), as zeroing the PGD memory before returning it to
the host is unnecessary in this failure path.

Signed-off-by: Vincent Donnefort <vdonnefort at google.com>

diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c
index d9ab58226889..0c82f1ddb93d 100644
--- a/arch/arm64/kvm/hyp/nvhe/pkvm.c
+++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c
@@ -861,7 +861,7 @@ int __pkvm_init_vm(struct kvm *host_kvm, unsigned long vm_hva,
 	kvm_guest_destroy_stage2(hyp_vm);
 err_remove_mappings:
 	unmap_donated_memory(hyp_vm, vm_size);
-	unmap_donated_memory(pgd, pgd_size);
+	unmap_donated_memory_noclear(pgd, pgd_size);
 err_unpin_kvm:
 	hyp_unpin_shared_mem(host_kvm, host_kvm + 1);
 	return ret;
-- 
2.55.0.rc2.803.g1fd1e6609c-goog