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[78.94.0.50]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a568a7e51esm11057004f8f.40.2025.06.16.07.01.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Jun 2025 07:01:30 -0700 (PDT) From: Michal Gorlas Subject: [PATCH v2 0/3] firmware: coreboot: Support for System Management Interrupt (SMI) handling in coreboot payload (MM payload concept) Date: Mon, 16 Jun 2025 16:01:11 +0200 Message-Id: <20250616-coreboot-payload-mm-v2-0-5d679b682e13@9elements.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAKcjUGgC/x3NQQ6DIBCF4auYWReiSLV21Xs0XQCOSgKOGYhpY 7x7ictv8f53QEL2mOBZHcC4++RpLVC3Ctxi1hmFH4tB1eped00rHDFaoiw28wtkRhGj6DqtrNV KPbSBstwYJ/+9qu9P8cQURV4YzdVytCPLptdD3+p60HL2WUZf/oKciYNJrwEDRlxzko4inOcf9 JM//6gAAAA= X-Change-ID: 20250613-coreboot-payload-mm-6642bb42284a To: Tzung-Bi Shih , Brian Norris , Julius Werner Cc: linux-kernel@vger.kernel.org, chrome-platform@lists.linux.dev, Marcello Sylvester Bauer , Michal Gorlas X-Mailer: b4 0.14.2 Hi, This patchset adds support for MM payload when Linux is used as coreboot's payload. The main idea is to delegate higher-level SMM functions to the payload, limiting the coreboot's System Management Mode (SMM) related responsibilities to the minimum of basic SMM setup [1]. This is done by loading a blob with SMI handler to the shared buffer, from which it is copied to SMRAM [2]. The MM payload is still in a Proof of Concept stage, and we are still working on getting the patches needed for coreboot upstreamed, but I would appreciate any feedback that you may have. Thanks, Michal [1]: https://github.com/9elements/LinuxBootSMM/wiki/Proposed-design#current-design-approach---mm-payload [2]: https://github.com/9elements/LinuxBootSMM/wiki/Proof-of-Concept-(PoC) Changes in v2: - merged mm_info into mm_loader - removed mm_loader_exit in favour of allocating memory with devm_*() - added forgotten "\n\t" in trigger_smi() - added gitignore in mm_handler/ - added COREBOOT_PAYLOAD_MM dependency on x86 - error handling for mm_info struct - error handling for shared_buffer - removed whitespace changes in coreboot_table.h - removed INFO level prints --- Michal Gorlas (3): firmware: coreboot: support for parsing SMM related informations from coreboot tables firmware: coreboot: loader for Linux-owned SMI handler firmware: coreboot: Linux-owned SMI handler to be loaded by coreboot drivers/firmware/google/Kconfig | 12 + drivers/firmware/google/Makefile | 11 + drivers/firmware/google/coreboot_table.h | 11 + drivers/firmware/google/mm_blob.S | 20 + drivers/firmware/google/mm_handler/.gitignore | 4 + drivers/firmware/google/mm_handler/Makefile | 51 +++ drivers/firmware/google/mm_handler/handler.lds.S | 46 ++ drivers/firmware/google/mm_handler/mm_handler.S | 510 +++++++++++++++++++++++ drivers/firmware/google/mm_handler/mm_handler.h | 21 + drivers/firmware/google/mm_handler/mm_header.S | 19 + drivers/firmware/google/mm_loader.c | 215 ++++++++++ drivers/firmware/google/mm_payload.h | 58 +++ 12 files changed, 978 insertions(+) --- base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 change-id: 20250613-coreboot-payload-mm-6642bb42284a Best regards, -- Michal Gorlas