Re: [PATCH 02/14] x86/sgx: Add /sys/kernel/debug/x86/sgx_total_mem

[Jarkko Sakkinen]

On Wed, 2021-09-15 at 13:30 -0700, Reinette Chatre wrote:
> From: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
> 
> Just like normal memory, SGX memory can be overcommitted.  SGX has its
> own reclaim mechanism which kicks in when physical SGX memory (Enclave
> Page Cache / EPC) is exhausted.  That reclaim mechanism is relatively
> rarely exercised and needs selftests to poke at it.
> 
> The amount of EPC on the system is determined by the BIOS and it varies
> wildly between systems.  It can be dozens of MB on desktops, or many GB
> on servers.
> 
> To run in a reasonable amount of time, the selftest needs to know how
> much EPC there is in the system.
> 
> Introduce a new debugfs file to export that information.
> 
> Acked-by: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
> [reinette: Use as placeholder patch until other discussions complete]
> Signed-off-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>

This could be replaced with the following two patches:

https://lore.kernel.org/linux-sgx/20210914030422.377601-1-jarkko@xxxxxxxxxx/T/#t

I forgot to CC this to you when I sent it, sorry about that.

/Jarkko