Re: [PATCH v8 2/9] PCI/IDE: Enumerate Selective Stream IDE capabilities

[Xu Yilun <yilun.xu@linux.intel.com>]

On Fri, Oct 31, 2025 at 02:28:54PM -0700, Dan Williams wrote:
> Link encryption is a new PCIe feature enumerated by "PCIe r7.0 section
> 7.9.26 IDE Extended Capability".
> 
> It is both a standalone port + endpoint capability, and a building block
> for the security protocol defined by "PCIe r7.0 section 11 TEE Device
> Interface Security Protocol (TDISP)". That protocol coordinates device
> security setup between a platform TSM (TEE Security Manager) and a
> device DSM (Device Security Manager). While the platform TSM can
> allocate resources like Stream ID and manage keys, it still requires
> system software to manage the IDE capability register block.
> 
> Add register definitions and basic enumeration in preparation for
> Selective IDE Stream establishment. A follow on change selects the new
> CONFIG_PCI_IDE symbol. Note that while the IDE specification defines
> both a point-to-point "Link Stream" and a Root Port to endpoint
> "Selective Stream", only "Selective Stream" is considered for Linux as
> that is the predominant mode expected by Trusted Execution Environment
> Security Managers (TSMs), and it is the security model that limits the
> number of PCI components within the TCB in a PCIe topology with
> switches.
> 
> Co-developed-by: Alexey Kardashevskiy <aik@amd.com>
> Signed-off-by: Alexey Kardashevskiy <aik@amd.com>
> Co-developed-by: Xu Yilun <yilun.xu@linux.intel.com>
> Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Reviewed-by: Alexey Kardashevskiy <aik@amd.com>
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@kernel.org>

Reviewed-by: Xu Yilun <yilun.xu@linux.intel.com>

> Signed-off-by: Dan Williams <dan.j.williams@intel.com>