[RFC PATCH v3 00/10] coco/TSM: Host-side Arm CCA IDE setup via connect/disconnect callbacks

["Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>]

This patch series implements the TSM ->connect() and ->disconnect() callbacks
required for the Arm CCA IDE setup as per the RMM ALP17 specification [1].

This patchset includes the host-side flow needed by connect/disconnect,
including:
- DA feature detection helpers
- host TSM callback wiring and IDE stream allocation support
- creation/registration of RMM pdev descriptors
- RMM pdev communication helpers
- pdev stop and teardown helpers for disconnect
- pdev instantiation from the connect path
- public key registration with RMM

To support public-key handling from the device certificate chain, the series
also includes the required X.509 parser updates.

The series builds upon the TSM framework patches posted at [2] and depends on
the KVM CCA patchset [3]. A git repository containing all the related changes is
available at [4].

Testing / Usage

To initiate the IDE setup:
	echo tsm0 > /sys/bus/pci/devices/$DEVICE/tsm/connect

To disconnect:
	echo tsm0 > /sys/bus/pci/devices/$DEVICE/tsm/disconnect

Previous posting:
rfc-v1 https://lore.kernel.org/all/20250728135216.48084-1-aneesh.kumar@kernel.org
rfc-v2 https://lore.kernel.org/all/20251027095602.1154418-1-aneesh.kumar@kernel.org

Changes from v2:
* rebase to latest kernel and core TSM changes
* Address review feedback.

[1] https://developer.arm.com/-/cdn-downloads/permalink/Architectures/Armv9/DEN0137_1.1-alp17.zip
[2] https://lore.kernel.org/all/20260303000207.1836586-1-dan.j.williams@intel.com
[3] https://lore.kernel.org/all/461fa23f-9add-40e5-a0d0-759030e7c70b@arm.com
[4] https://gitlab.arm.com/linux-arm/linux-cca.git cca/topics/cca-tdisp-upstream-rfc-v3


Aneesh Kumar K.V (Arm) (7):
  KVM: arm64: RMI: Add and export kvm_has_da_feature helper
  coco: host: arm64: Add host TSM callback and IDE stream allocation
    support
  coco: host: arm64: Build and register RMM pdev descriptors
  coco: host: arm64: Add RMM device communication helpers
  coco: host: arm64: Add helper to stop and tear down an RMM pdev
  coco: host: arm64: Instantiate RMM pdev during device connect
  coco: host: arm64: Register device public key with RMM

Lukas Wunner (3):
  X.509: Make certificate parser public
  X.509: Parse Subject Alternative Name in certificates
  X.509: Move certificate length retrieval into new helper

 arch/arm64/include/asm/kvm_rmi.h          |   1 +
 arch/arm64/include/asm/rmi_cmds.h         |  78 +++
 arch/arm64/include/asm/rmi_smc.h          | 183 ++++++-
 arch/arm64/kvm/rmi.c                      |   6 +
 crypto/asymmetric_keys/x509_cert_parser.c |   9 +
 crypto/asymmetric_keys/x509_loader.c      |  38 +-
 crypto/asymmetric_keys/x509_parser.h      |  42 +-
 drivers/firmware/smccc/rmm.c              |  12 +
 drivers/firmware/smccc/rmm.h              |   8 +
 drivers/firmware/smccc/smccc.c            |   1 +
 drivers/virt/coco/Kconfig                 |   2 +
 drivers/virt/coco/Makefile                |   1 +
 drivers/virt/coco/arm-cca-host/Kconfig    |  23 +
 drivers/virt/coco/arm-cca-host/Makefile   |   5 +
 drivers/virt/coco/arm-cca-host/arm-cca.c  | 274 ++++++++++
 drivers/virt/coco/arm-cca-host/rmi-da.c   | 639 ++++++++++++++++++++++
 drivers/virt/coco/arm-cca-host/rmi-da.h   | 122 +++++
 include/keys/asymmetric-type.h            |   2 +
 include/keys/x509-parser.h                |  57 ++
 19 files changed, 1448 insertions(+), 55 deletions(-)
 create mode 100644 drivers/virt/coco/arm-cca-host/Kconfig
 create mode 100644 drivers/virt/coco/arm-cca-host/Makefile
 create mode 100644 drivers/virt/coco/arm-cca-host/arm-cca.c
 create mode 100644 drivers/virt/coco/arm-cca-host/rmi-da.c
 create mode 100644 drivers/virt/coco/arm-cca-host/rmi-da.h
 create mode 100644 include/keys/x509-parser.h

-- 
2.43.0