[v2,0/5] x86: Show in sysfs if a memory node is able to do encryption

Message

Martin Fernandez Nov. 24, 2021, 8:34 p.m. UTC

Show for each node if every memory descriptor in that node has the
EFI_MEMORY_CPU_CRYPTO attribute.

fwupd project plans to use it as part of a check to see if the users
have properly configured memory hardware encryption capabilities. It's
planned to make it part of a specification that can be passed to
people purchasing hardware. It's called Host Security ID:
https://fwupd.github.io/libfwupdplugin/hsi.html

This also can be useful in the future if NUMA decides to prioritize
nodes that are able to do encryption.

Changes since v1:

Modify __e820__range_update to update the crypto capabilities of a
range; now this function will change the crypto capability of a range
if it's called with the same old_type and new_type. Rework
efi_mark_e820_regions_as_crypto_capable based on this.

Update do_add_efi_memmap to mark the regions as it creates them.

Change the type of crypto_capable in e820_entry from bool to u8.

Fix e820__update_table changes.

Remove memblock_add_crypto_capable. Now you have to add the region and
mark it then.

Better place for crypto_capable in pglist_data.

Martin Fernandez (5):
  mm/memblock: Tag memblocks with crypto capabilities
  mm/mmzone: Tag pg_data_t with crypto capabilities
  x86/e820: Tag e820_entry with crypto capabilities
  x86/efi: Tag e820_entries as crypto capable from EFI memmap
  drivers/node: Show in sysfs node's crypto capabilities

 Documentation/ABI/testing/sysfs-devices-node | 10 ++++
 arch/x86/include/asm/e820/api.h              |  1 +
 arch/x86/include/asm/e820/types.h            |  1 +
 arch/x86/kernel/e820.c                       | 58 ++++++++++++++++----
 arch/x86/platform/efi/efi.c                  | 25 +++++++++
 drivers/base/node.c                          | 10 ++++
 include/linux/memblock.h                     |  5 ++
 include/linux/mmzone.h                       |  3 +
 mm/memblock.c                                | 49 +++++++++++++++++
 mm/page_alloc.c                              |  1 +
 10 files changed, 152 insertions(+), 11 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-devices-node