From: Dave Hansen <dave.hansen@intel.com>
To: Jarkko Sakkinen <jarkko@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>
Cc: reinette.chatre@intel.com, tony.luck@intel.com,
linux-kernel@vger.kernel.org, linux-sgx@vger.kernel.org
Subject: Re: [PATCH v9 2/2] x86/sgx: Add an attribute for the amount of SGX memory in a NUMA node
Date: Fri, 29 Oct 2021 10:00:35 -0700 [thread overview]
Message-ID: <3ffafe28-e770-a285-98d0-1379271ba36d@intel.com> (raw)
In-Reply-To: <20211029121857.477885-2-jarkko@kernel.org>
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?
next prev parent reply other threads:[~2021-10-29 17:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-29 12:18 [PATCH v9 1/2] x86/sgx: Rename fallback labels in sgx_init() Jarkko Sakkinen
2021-10-29 12:18 ` [PATCH v9 2/2] x86/sgx: Add an attribute for the amount of SGX memory in a NUMA node Jarkko Sakkinen
2021-10-29 14:53 ` Greg Kroah-Hartman
2021-10-31 17:39 ` Jarkko Sakkinen
2021-10-31 19:30 ` Greg Kroah-Hartman
2021-10-31 23:52 ` Jarkko Sakkinen
2021-10-29 17:00 ` Dave Hansen [this message]
2021-10-31 17:49 ` Jarkko Sakkinen
2021-11-01 0:01 ` Jarkko Sakkinen
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