On Tue, Jul 06, 2021 at 07:56:40AM -0700, Dave Hansen wrote: > On 7/5/21 7:36 AM, Jarkko Sakkinen wrote: > > Create /sys/kernel/debug/x86/sgx_nr_all_pages, which reports total > > number of EPC pages available in the system. > Could we flesh this out a bit, please? > > What's the value here when userspace could just re-enumerate the EPC > size from CPUID? My thinking is that it is better to use "kernel synthesized" value for the EPC size, because kernel controls the EPC. > I'd really appreciate if we could draw parallels between these additions > to the "SGX VM" and their analogs in the "core VM". In this case, I > think the closest analog is probably "MemTotal" in /proc/meminfo. Would make sense. > Second, how is this going to be used? SGX kselftest creates a heap, of which size is the same as the total size of the EPC reported by the kernel. > Third, is this going to be the ABI forever? AFAIK, debugfs is not part of the ABI. /Jarkko
