[PATCH v17 13/35] gunyah: vm_mgr: Add framework for VM Functions

[Srivatsa Vaddagiri]

* Elliot Berman <quic_eberman at quicinc.com> [2024-02-22 15:16:36]:

> Introduce a framework for Gunyah userspace to install VM functions. VM
> functions are optional interfaces to the virtual machine. vCPUs,
> ioeventfs, and irqfds are examples of such VM functions and are
> implemented in subsequent patches.
> 
> A generic framework is implemented instead of individual ioctls to
> create vCPUs, irqfds, etc., in order to simplify the VM manager core
> implementation and allow dynamic loading of VM function modules.
>
> Signed-off-by: Elliot Berman <quic_eberman at quicinc.com>

Minor nit below. LGTM otherwise

Reviewed-by: Srivatsa Vaddagiri <quic_svaddagi at quicinc.com>

> +static struct gunyah_vm_function *gunyah_vm_get_function(u32 type)
> +{
> +	struct gunyah_vm_function *fn;
> +
> +	fn = xa_load(&gunyah_vm_functions, type);
> +	if (!fn) {
> +		request_module("ghfunc:%d", type);

s/%d/%u

> +
> +		fn = xa_load(&gunyah_vm_functions, type);
> +	}
> +
> +	if (!fn || !try_module_get(fn->mod))
> +		fn = ERR_PTR(-ENOENT);
> +
> +	return fn;
> +}