x86/sgx: NUMA

Make sgx_alloc_epc_page() more balanced among the NUMA nodes, refactoring hierarchical listi into a single global free list managed in FIFO fashion.

Introduce NUMA node local free EPC page lists. In sgx_alloc_epc_page(), try first to allocate from the local free list, and fallback to global free list, if the local list is empty.

v3:
* Expanded into a full patch set, which also implements more balanced EPC allocation among the NUMA nodes. Since none of the patches fully match the previous single patch entry, included earlier change log to the cover letter.

v2:
* s/section_list/numa_section_list/
* s/MAX_NUMNODES//num_possible_nodes()/
* Add more verbose inline comments that Dave provided.
* If NUMA mapping fails, print a warning and description of the fallback. The physical address is already printed in pr_info(), just before the mapping happens.

Jarkko Sakkinen (3):
x86/sgx: Use sgx_free_epc_page() in sgx_reclaim_pages() x86/sgx: Replace section local dirty page lists with a global list x86/sgx: Add a basic NUMA allocation scheme to sgx_alloc_epc_page()

 arch/x86/Kconfig               |   1 +
 arch/x86/kernel/cpu/sgx/main.c | 203 ++++++++++++++++++---------------
 arch/x86/kernel/cpu/sgx/sgx.h  |  23 ++--
 3 files changed, 121 insertions(+), 106 deletions(-)

2.30.2