Re: [PATCH] x86/sgx: Add SGX_MemTotal to /proc/meminfo

[Dave Hansen]

On 8/18/21 6:25 AM, Jarkko Sakkinen wrote:
> The amount of SGX memory on the system is determined by the BIOS and it
> varies wildly between systems.  It can be from dozens of MB's on desktops
> or VM's, up to many GB's on servers.  Just like for regular memory, it is
> sometimes useful to know the amount of usable SGX memory in the system.
> 
> Add SGX_MemTotal field to /proc/meminfo, which shows the total amount of
> usable SGX memory in the system.  E.g. with 32 MB reserved for SGX from
> BIOS, the printout would be:
> 
> SGX_MemTotal:      22528 kB

The big question here: Do we want to put purely architecture-specific
entries in (the currently quite arch-independent) /proc/meminfo?

The current "DirectMap4k/2M/1G" entries from arch_report_meminfo() are
arch-specific in their sizes, of course, but the concept is at least
quite arch-independent.