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Sat, 14 Nov 2026 17:34:59 -0800 (PST) Received: from sid-dev-env.cgrhrlrrq2nuffriizdlnb1x4b.xx.internal.cloudapp.net ([4.155.54.158]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ee0f75dde9sm23671935ad.22.2026.11.14.17.34.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Nov 2026 17:34:58 -0800 (PST) From: Siddharth Chintamaneni To: Peter Huewe , Jarkko Sakkinen Cc: Jason Gunthorpe , Sudeep Holla , Yeoreum Yun , Stuart Yoder , apais@microsoft.com, rachelmenge@linux.microsoft.com, hargar@linux.microsoft.com, linux-integrity@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Siddharth Chintamaneni Subject: [PATCH v3 0/4] tpm: Cache ACPI TPM2 start method and gate tpm_crb_ffa probe Date: Sun, 15 Nov 2026 01:34:52 +0000 Message-ID: <20261115013456.212141-1-sidchintamaneni@gmail.com> X-Mailer: git-send-email 2.43.0 X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261114_173500_735342_1557B394 X-CRM114-Status: UNSURE ( 9.85 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.1 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 This series caches the ACPI TPM2 start method in tpm_init() and uses the cached tpm2_acpi_start_method value across tpm_crb_ffa, tpm_tis, and tpm_crb. Patch 1 caches the ACPI TPM2 start method once in tpm_init() into tpm2_acpi_start_method (defaulting to ACPI_TPM2_NOT_ALLOWED when absent or invalid) and logs it when a TPM2 ACPI table is present. Patch 2 checks tpm2_acpi_start_method in tpm_crb_ffa_probe() and returns -ENODEV unless ACPI advertises ACPI_TPM2_CRB_WITH_ARM_FFA, skipping FF-A probing on non-FF-A platforms while keeping modular tpm_crb/tpm_crb_ffa loading intact. Patches 3 and 4 update tpm_tis and tpm_crb to use the cached tpm2_acpi_start_method value directly. Changes in v3: - Log tpm2_acpi_start_method in tpm_init() after acpi_put_table() and use a single-line acpi_get_table() call with typeof(tbl->header) cast (Jarkko Sakkinen). - Remove check_acpi_tpm2() in tpm_tis and open-code the check in tpm_tis_init(), dropping dev_err() and returning -ENODEV (Jarkko Sakkinen). - Remove priv->sm and local sm in tpm_crb, use tpm2_acpi_start_method throughout, drop the probe dev_err() messages, and return -ENODEV (Jarkko Sakkinen). Changes in v2: - Expand into a 4-patch series caching tpm2_acpi_start_method in tpm_init() and converting tpm_crb_ffa, tpm_tis, and tpm_crb to use it (Jarkko Sakkinen). - Move the tpm_crb_ffa start_method check from module_init into tpm_crb_ffa_probe() so tpm_crb.ko and tpm_crb_ffa.ko still load cleanly on non-FF-A systems when built as modules. v2: https://lore.kernel.org/linux-integrity/20261114193434.117714-1-sidchintamaneni@gmail.com/ v1: https://lore.kernel.org/linux-integrity/20261112233807.70664-1-sidchintamaneni@gmail.com/ Jarkko Sakkinen (1): tpm: Cache TPM2 start method Siddharth Chintamaneni (3): tpm: tpm_crb_ffa: Only probe when ACPI TPM2 uses FF-A tpm: tpm_tis: Use cached tpm2_acpi_start_method tpm: tpm_crb: Use cached tpm2_acpi_start_method drivers/char/tpm/tpm-interface.c | 21 ++++++++ drivers/char/tpm/tpm.h | 1 + drivers/char/tpm/tpm_crb.c | 82 +++++++++++++++----------------- drivers/char/tpm/tpm_crb_ffa.c | 5 ++ drivers/char/tpm/tpm_tis.c | 45 +++--------------- 5 files changed, 71 insertions(+), 83 deletions(-) base-commit: 7e52fc165aa50e70e8df3c879d04fc0ff1673d4a -- 2.45.4