linux-kernel - [PATCH v3 0/5] x86: Show in sysfs if a memory node is able to do encryption

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Message-Id: <20211203192148.585399-1-martin.fernandez@eclypsium.com>
Date:   Fri,  3 Dec 2021 16:21:43 -0300
From:   Martin Fernandez <martin.fernandez@...ypsium.com>
To:     linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-mm@...ck.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        ardb@...nel.org, dvhart@...radead.org, andy@...radead.org,
        gregkh@...uxfoundation.org, rafael@...nel.org, rppt@...nel.org,
        akpm@...ux-foundation.org, daniel.gutson@...ypsium.com,
        hughsient@...il.com, alex.bazhaniuk@...ypsium.com,
        alison.schofield@...el.com,
        Martin Fernandez <martin.fernandez@...ypsium.com>
Subject: [PATCH v3 0/5] x86: Show in sysfs if a memory node is able to do encryption

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 v2:

e820__range_mark_crypto -> e820__range_mark_crypto_capable.

In e820__range_remove: Create a region with crypto capabilities
instead of creating one without it and then mark it.

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
  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

 arch/x86/include/asm/e820/api.h   |  1 +
 arch/x86/include/asm/e820/types.h |  1 +
 arch/x86/kernel/e820.c            | 59 ++++++++++++++++++++++++-------
 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 +
 9 files changed, 142 insertions(+), 12 deletions(-)

-- 
2.30.2