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

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.