[RFC PATCH v3 00/12] coco/TSM: Implement host-side support for Arm CCA TDISP setup

[Aneesh Kumar K.V (Arm)]

This patch series implements the host-side changes needed for end-to-end
Arm CCA TDISP setup. It adds the RMI/RHI plumbing required to create and
manage Realm vdev objects, service device-attestation object requests, and
complete the KVM/RMM flows needed for device run-time transitions.

The series is based on the RMM ALP17 specification [1] and the
RHI v1.0 BET1 specification [5].

At a high level, the series adds support for:
- host-side vdev communication and lifecycle management
- host handling of RHI DA object read/size requests
- host-side fetching and caching of interface reports and measurements
- KVM handling of vdev request/complete exits
- KVM handling of map/validation exits and teardown on granule destroy
- vdev transition to TDISP RUN state
- enabling DA in Realm create parameters

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

Previous posting:
rfc-v1: https://lore.kernel.org/all/20250728135216.48084-1-aneesh.kumar@xxxxxxxxxx
There is no rfc-v2 posting. This series is marked rfc-v3 to stay aligned
with the rest of the CCA patchsets that are being posted as v3.

Changes from v1:
- 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@xxxxxxxxx
[3] https://lore.kernel.org/all/461fa23f-9add-40e5-a0d0-759030e7c70b@xxxxxxx
[4] https://gitlab.arm.com/linux-arm/linux-cca.git cca/topics/cca-tdisp-upstream-rfc-v3
[5] https://developer.arm.com/documentation/den0148/latest/ RHI

Aneesh Kumar K.V (Arm) (12):
  coco: host: arm64: Add support for virtual device communication
  coco: host: arm64: Add support for RMM vdev objects
  coco: host: arm64: Add helpers to unlock and destroy RMM vdev
  coco: host: arm64: Add support for da object read RHI handling
  coco: host: arm64: Add helper for cached object fetches
  coco: host: arm64: Fetch interface report via RMI
  coco: host: arm64: Fetch device measurements via RMI
  coco: host: KVM: arm64: Handle vdev request exits and completion
  coco: host: KVM: arm64: Handle vdev map/validation exits
  KVM: arm64: Unmap device mappings when a private granule is destroyed
  coco: host: arm64: Transition vdevs to TDISP RUN state
  KVM: arm64: CCA: enable DA in realm create parameters

 Documentation/virt/kvm/api.rst           |  22 +
 arch/arm64/include/asm/kvm_rmi.h         |   4 +
 arch/arm64/include/asm/rhi.h             |   9 +
 arch/arm64/include/asm/rmi_cmds.h        | 163 +++++++
 arch/arm64/include/asm/rmi_smc.h         |  75 +++-
 arch/arm64/include/uapi/asm/rmi-da.h     |  43 ++
 arch/arm64/kvm/rmi-exit.c                |  55 +++
 arch/arm64/kvm/rmi.c                     | 183 +++++++-
 drivers/virt/coco/arm-cca-host/arm-cca.c | 200 +++++++++
 drivers/virt/coco/arm-cca-host/rmi-da.c  | 544 ++++++++++++++++++++++-
 drivers/virt/coco/arm-cca-host/rmi-da.h  |  39 ++
 include/linux/kvm_host.h                 |   1 +
 include/uapi/linux/kvm.h                 |  10 +
 virt/kvm/kvm_main.c                      |   6 +
 14 files changed, 1337 insertions(+), 17 deletions(-)
 create mode 100644 arch/arm64/include/uapi/asm/rmi-da.h

-- 
2.43.0