Re: [PATCH v4 0/3] Add TPM support via Qualcomm TEE TPM TA

[Jarkko Sakkinen <jarkko@kernel.org>]

On Mon, Oct 19, 2026 at 02:51:45PM +0530, Kuldeep Singh wrote:
> Qualcomm platforms with a discrete TPM (dTPM) talked to it directly over
> a non-secure SPI channel from the kernel. Arm's Base Boot Security
> Requirements (BBSR) v1.4 require that access to go through TrustZone
> instead, so on affected Qualcomm platforms the TPM 2.0 instance is now
> fronted by a Trusted Application (TA) running inside Qualcomm's Trusted
> Execution Environment (QTEE), which talks to the dTPM (or implements an
> fTPM) on the kernel's behalf.
> 
> This series adds a kernel driver for that TA, built on the QCOMTEE
> object-IPC transport (drivers/tee/qcomtee/) already used to reach other
> QTEE services.
> 
> This patch series functionally depends on below(first 5 changes specially)
> for qtee service discovery.
> - https://lore.kernel.org/lkml/20261015-qcom_uefisecapp_migrate_qcomtee-v5-0-1460691b35d3@oss.qualcomm.com/
> 
> Tested on Glymur-crd target with tpm2-tools utility.
> 
> Validations:
> - Get capabilities
> - Random number generator
> - RSA key creation, encryption and decryption.
> 
> Signed-off-by: Kuldeep Singh <kuldeep.singh@oss.qualcomm.com>
> ---
> Changes in v4:
> - Add new line before goto label(Jarkko).
> - Link to v3: https://patch.msgid.link/20261015-tpm_qcom_driver-v3-0-247c8e50250e@qti.qualcomm.com
> 
> Changes in v3:
> - Merge tpm_qcom.h into tpm_qcom.c(Amir comments)
> - Update return values of functions and drop certain error prints.
> - Define locality_arg as default value.
> - Add Jarkko's tag on all but drop from 2/3 as significant changes done.
> - Link to v2: https://patch.msgid.link/20260907-tpm_qcom_driver-v2-0-71a6b1752da8@oss.qualcomm.com
> 
> Changes in v2:
> - Use QCOMTEE_TPM_UID as 81 for service discovery in patch 1.
> - Use FIELD_GET, zero initialised array and log improvement (Konrad)
> - Improve commit title and other fixes (Jarkko)
> - Split MAINTAINERS entry as separate patch.
> - Link to v1: https://patch.msgid.link/20260831-tpm_qcom_driver-v1-0-6f16fa6924fa@oss.qualcomm.com
> 
> To: Amirreza Zarrabi <amirreza.zarrabi@oss.qualcomm.com>
> To: Jens Wiklander <jenswi@kernel.org>
> To: Sumit Garg <sumit.garg@kernel.org>
> To: Peter Huewe <peterhuewe@gmx.de>
> To: Jarkko Sakkinen <jarkko@kernel.org>
> To: Jason Gunthorpe <jgg@ziepe.ca>
> To: Kuldeep Singh <kuldeep.singh@oss.qualcomm.com>
> Cc: linux-arm-msm@vger.kernel.org
> Cc: op-tee@lists.trustedfirmware.org
> Cc: linux-kernel@vger.kernel.org
> Cc: linux-integrity@vger.kernel.org
> 
> ---
> Kuldeep Singh (3):
>       tee: qcomtee: Register qcom.tz.tpm service for discovery
>       tpm: Introduce Qualcomm TPM driver
>       MAINTAINERS: Add Qualcomm TPM driver entry
> 
>  MAINTAINERS                       |   6 +
>  drivers/char/tpm/Kconfig          |   9 +
>  drivers/char/tpm/Makefile         |   1 +
>  drivers/char/tpm/tpm_qcom.c       | 414 ++++++++++++++++++++++++++++++++++++++
>  drivers/tee/qcomtee/call.c        |   4 +-
>  drivers/tee/qcomtee/qcomtee_msg.h |   2 +
>  6 files changed, 435 insertions(+), 1 deletion(-)
> ---
> base-commit: 2efb7a11f1aa4d2dc285fe2680cca22cb9f72f64
> change-id: 20260831-tpm_qcom_driver-d21c720e73b2
> prerequisite-change-id: 20260408-qcom_uefisecapp_migrate_qcomtee-13869d45e014:v5
> prerequisite-patch-id: faf4520d818abf0d7533f71d9c8b9a8aade34626
> prerequisite-patch-id: b487dfe2fbc076f4815dc6c73b9e68b0b78c961f
> prerequisite-patch-id: 9f2c4ee37ba173bdc860f253d44974379f2cf125
> prerequisite-patch-id: e86905ac6289821db30fd9a17f73e276e0a88363
> prerequisite-patch-id: 8777bfa2ef8344715bf972d049acb0a6ef49b136
> prerequisite-patch-id: 1c7f946e770a1cbc1599f9571282c9265a6af9cd
> prerequisite-patch-id: 7be993abea2ca36057d9352381a5890f50996dda
> 
> Best regards,
> --  
> Kuldeep Singh <kuldeep.singh@oss.qualcomm.com>
> 

Applying this pulls tons of TEE patches:

Applying: tee: qcomtee: Track the object invocation context
Applying: tee: Add kernel client object invoke helper
Applying: tee: qcomtee: Allow object invokes from kernel clients
Applying: tee: Export uuidv5 generation for TEE backends
Applying: tee: qcomtee: Add support for registering QTEE services on TEE bus
Applying: firmware: qcom: Add support for TEE based EFI-var client driver
Applying: arm64: defconfig: Enable UefiSecApp TEE client driver for Qualcomm SoCs
Applying: tee: qcomtee: Register qcom.tz.tpm service for discovery
Applying: tpm: Introduce Qualcomm TPM driver
Applying: MAINTAINERS: Add Qualcomm TPM driver entry

Br, Jarkko