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# hv_vmx_vcpu_set_apic_address(_:_:)

Sets the address of the guest Advanced Programmable Interrupt Controller (APIC) for a vCPU in the guest physical address space of the VM.

```
func hv_vmx_vcpu_set_apic_address(_ vcpu: hv_vcpuid_t, _ gpa: hv_gpaddr_t) -> hv_return_t
```

## Parameters

`vcpu`

The ID of the vCPU.

`gpa`

The address in the guest physical address space. It must be page-aligned.

## Return Value

[`HV_SUCCESS`](/documentation/Hypervisor/HV_SUCCESS) if the operation was successful, otherwise an error code specified in [`hv_return_t`](/documentation/Hypervisor/hv_return_t).

## Discussion

> Important:
> This function must be called by the owning thread.

---

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