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Multiple PAC keys support for Linux kernel

According to the Linux document (www.kernel.org/.../pointer-authentication.html),

"The extension provides five separate keys to generate PACs - two for instruction addresses (APIAKey, APIBKey), two for data addresses (APDAKey, APDBKey), and one for generic authentication (APGAKey)."

Looking to the latest Linux kernel source code, however, while all the five keys are supported for userspace, it seems only one key, apia, is supported in case of kernel space.

I'd like to ask if it is correct that only one key, apia, is currently supported in case of kernel.

If it is, I wonder if there is any plan for the other four keys to be also added for kernel space.

Please kindly give me any answers or information on my question.

Thank you.

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