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-rw-r--r--tools/testing/selftests/kvm/lib/aarch64/ucall.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/lib/aarch64/ucall.c b/tools/testing/selftests/kvm/lib/aarch64/ucall.c
index c8e0ec20d3bf..2f37b90ee1a9 100644
--- a/tools/testing/selftests/kvm/lib/aarch64/ucall.c
+++ b/tools/testing/selftests/kvm/lib/aarch64/ucall.c
@@ -94,6 +94,9 @@ uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc)
struct kvm_run *run = vcpu_state(vm, vcpu_id);
struct ucall ucall = {};
+ if (uc)
+ memset(uc, 0, sizeof(*uc));
+
if (run->exit_reason == KVM_EXIT_MMIO &&
run->mmio.phys_addr == (uint64_t)ucall_exit_mmio_addr) {
vm_vaddr_t gva;