[PATCH v5 00/15] coco/TSM: Host-side Arm CCA IDE setup via connect/disconnect callbacks

This patch series implements the TSM ->connect() and ->disconnect() callbacks
required for the Arm CCA IDE setup as per the RMM 2.0bet3 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.

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

The series is based on:
  - https://lore.kernel.org/all/20260904095000.1184861-1-aneesh.kumar@kernel.org (local)
  - https://lore.kernel.org/all/20260907095942.1140734-1-suzuki.poulose@arm.com (local)

Changes from v4:
https://lore.kernel.org/all/20260427065121.916615-1-aneesh.kumar@kernel.org (local)
* Update rmi_set_pub_key() based on the latest specification.
* Rename structure members to match the specification.
* Rebase on top of the latest dependent series.

Changes from v3:
https://lore.kernel.org/all/20260312080129.3483585-1-aneesh.kumar@kernel.org (local)
* updated the patches to follow the RMM 2.0bet1 specification
* reworked the host-side pdev lifecycle to better match the RMM 2.0bet1 flow,
  including common pdev state, root-port pdev support, and non-coherent stream
  setup and teardown
* split PF0 setup into identity collection and conditional public-key
  installation, and gate DA enablement on RMI_FEATURE_REGISTER_2_DA
* added coordinated handling for RMI_DEV_COMM_EXIT_STREAM_WAIT, along with
  stream connect/disconnect and stream key refresh/purge support during vdev
  teardown

Changes from v2:
rfc-v2 https://lore.kernel.org/all/20251027095602.1154418-1-aneesh.kumar@kernel.org (local)
* rebase to latest kernel and core TSM changes
* Address review feedback.

v1:
rfc-v1 https://lore.kernel.org/all/20250728135216.48084-1-aneesh.kumar@kernel.org (local)

[1] https://developer.arm.com/documentation/den0137/2-0bet3/
[2] https://lore.kernel.org/all/20260303000207.1836586-1-dan.j.williams@intel.com (local)
[3] https://lore.kernel.org/all/20260318155413.793430-1-steven.price@arm.com (local)
[4] https://gitlab.arm.com/linux-arm/linux-cca.git cca/topics/cca-tdisp-upstream-rfc-v4

Cc: Alexey Kardashevskiy <redacted>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dan Williams <redacted>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Samuel Ortiz <redacted>
Cc: Steven Price <steven.price@arm.com>
Cc: Suzuki K Poulose <Suzuki.Poulose@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xu Yilun <redacted>

Aneesh Kumar K.V (Arm) (12):
  coco: host: arm64: Prepare host TSM plumbing for IDE streams
  coco: host: arm64: Create RMM pdev objects for PCI endpoints
  coco: host: arm64: Add RMM pdev communication plumbing
  coco: host: arm64: Add RMM pdev stop and destroy helper
  coco: host: arm64: Register device public key with RMM
  coco: host: arm64: Initialize RMM pdev state for TDISP IDE connect
  coco: host: arm64: Coordinate peer stream waits during pdev
    communication
  coco: host: arm64: Connect RMM pdev streams for IDE devices
  coco: host: arm64: Refcount root-port pdevs used by IDE streams
  PCI/TSM: Move CMA DOE mailbox discovery out of
    pci_tsm_pf0_constructor()
  coco: host: arm64: Add NCOH_SYS stream support for RC endpoints
  coco: host: arm64: Enable PCI TSM connect callbacks

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

 crypto/asymmetric_keys/x509_cert_parser.c |   9 +
 crypto/asymmetric_keys/x509_loader.c      |  38 +-
 crypto/asymmetric_keys/x509_parser.h      |  42 +-
 drivers/crypto/ccp/sev-dev-tsm.c          |  13 +
 drivers/firmware/arm_rmm/rmi.c            |   4 +-
 drivers/firmware/smccc/smccc.c            |   6 +
 drivers/pci/tsm.c                         |  13 +-
 drivers/virt/coco/Kconfig                 |   2 +
 drivers/virt/coco/Makefile                |   1 +
 drivers/virt/coco/arm-cca-host/Kconfig    |  26 +
 drivers/virt/coco/arm-cca-host/Makefile   |   5 +
 drivers/virt/coco/arm-cca-host/main.c     | 461 ++++++++++++
 drivers/virt/coco/arm-cca-host/rmi-da.c   | 859 ++++++++++++++++++++++
 drivers/virt/coco/arm-cca-host/rmi-da.h   | 217 ++++++
 include/keys/asymmetric-type.h            |   2 +
 include/keys/x509-parser.h                |  57 ++
 include/linux/arm-rmi-cmds.h              |  85 +++
 include/linux/arm-smccc-rmi.h             | 161 ++++
 18 files changed, 1940 insertions(+), 61 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/main.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