Re: [PATCH v7 0/9] PCI/TSM: Core infrastructure for PCI device security (TDISP)

Aneesh Kumar K.V
2025-10-27T10:01:13Z

Dan Williams <dan.j.williams@intel.com> writes:

> Changes since v6 [1]:
> - Rebase on v6.18-rc2
> - Drop @owner from 'struct pci_tsm' and lookup @ops through @tsm_dev
> (Alexey)
> - Drop CONFIG_PCI_IDE_STREAM_MAX, only require pci_ide_set_nr_streams()
> for host bridge implementations that limit streams to something less
> than topology max (Aneesh)
> - Convert Stream index allocators from bitmaps to ida (preparation for
> solving Stream ID uniqueness problem reported by Alexey)
> - Misc whitespace cleanups (Jonathan)
> - Misc kdoc fixups
> - Fix nr_ide_streams data type, a u8 is too small
> - Rename PCI_DOE_PROTO_ => PCI_DOE_FEATURE_ (Alexey)
> - Rename @base to @base_tsm in 'struct pci_tsm_pf0' (Aneesh)
> - Fix up PCIe r6.1 reference for PCIe r7.0 (Bjorn)
> - Fix to_pci_tsm_pf0() failing to walk to the DSM device (Yilun)
> - Add pci_tsm_fn_exit() for sub-function cleanups post DSM disconnect
> (Aneesh)
> - Move the samples/devsec/ implementation to a follow-on patch set
>
> [1]: http://lore.kernel.org/20250911235647.3248419-1-dan.j.williams@intel.com
>
> This set is available at
> https://git.kernel.org/pub/scm/linux/kernel/git/devsec/tsm.git/log/?h=staging
> (rebasing branch) or devsec-20251023 (immutable tag). That branch
> additionally contains address association support, Stream ID uniqueness
> compability quirk, updated samples/devsec/ (now with multifunction
> device and simple bind support), and an updated preview of v2 of "[PATCH
> 0/7] PCI/TSM: TEE I/O infrastructure" (fixes x86 encrypted ioremap and
> other changes) [2].
>
> [2]: http://lore.kernel.org/20250827035259.1356758-1-dan.j.williams@intel.com
>
> It passes an updated regression testing using samples/devsec/. See this
> commit on the staging branch for that test:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/devsec/tsm.git/commit/?id=44932bffdcc1
>
> Status: ->connect() flow is settled
> -----------------------------------
> At the risk of tempting fate, the goal is this v7 goes to linux-next via
> a stable tsm.git#next branch. Enable one or more TSM driver
> implementations to queue on top for v6.19-rc1 via arch-specific trees
> for TDX, TIO, CCA, or COVE-IO. I.e. target v6.19 to support baseline
> link encryption (IDE) / secure-session establishment without
> confidential device-assignment.
>
> That tsm.git#next goal still needs follow-on patches like the following
> to settle:
>
> Alexey Kardashevskiy (1):
> PCI/IDE: Initialize an ID for all IDE streams
>
> Xu Yilun (1):
> PCI/IDE: Add Address Association Register setup for downstream MMIO
>
> ...but otherwise the core infrastructure is ready to support IDE
> establishment via a platform TSM.
>
> Next steps:
> -----------
> - Stage at least one vendor ->connect() implementation on top of a
> tsm.git#staging snapshot, for integration testing.
>
> - Additionally get at least one vendor ->connect() implementation queued
> in an arch tree for linux-next in time for v6.19, otherwise
> tsm.git#next may need to wait for v6.20.
>

Arm CCA changes can be found https://lore.kernel.org/all/20251027095602.1154418-2-aneesh.kumar@kernel.org

-aneesh