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SubjectRe: [PATCH v9 2/2] x86/sgx: Add an attribute for the amount of SGX memory in a NUMA node
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On 10/29/21 5:18 AM, Jarkko Sakkinen wrote:
> +What: /sys/devices/system/node/nodeX/sgx/size
> +Date: October 2021
> +Contact: Jarkko Sakkinen <jarkko@kernel.org>

I don't think we should do something *entirely* SGX-specific here. The
only question to me is whether any non-SGX users want something like
this and who they are.

Here are some ideas I like more than an "sgx/" directory:

/sys/devices/system/node/nodeX/arch/sgx_size
/sys/devices/system/node/nodeX/x86/sgx_size
/sys/devices/system/node/nodeX/coco/sgx_size

There's somebody else *today* who is trying to do something in the same
general area: per-node platform-specific memory encryption capabilities:

> https://lore.kernel.org/all/20211027195511.207552-6-martin.fernandez@eclypsium.com/

Also, could we please think through how this will look if we add more
attributes? I can imagine wanting both:

* total SGX memory available
* total SGX memory present

But those would be quite hard to differentiate if we have just an
"sgx_size".

Wouldn't it be much nicer to name them things like:

sgx_present_bytes
sgx_available_bytes

?

In other words, can we please try to think just a bit into the future on
this one? What other SGX things will we want to export like this?
Outside of SGX, who else wants stuff _like_ this?

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