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[78.94.0.50]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a561a3ce6bsm2078875f8f.49.2025.06.12.07.06.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Jun 2025 07:06:26 -0700 (PDT) From: Michal Gorlas To: Tzung-Bi Shih , Brian Norris , Julius Werner Cc: marcello.bauer@9elements.com, Michal Gorlas , chrome-platform@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v1 0/3] firmware: coreboot: Support for System Management Interrupt (SMI) handling in coreboot payload (MM payload concept) Date: Thu, 12 Jun 2025 16:05:47 +0200 Message-ID: X-Mailer: git-send-email 2.49.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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) 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 | 12 + drivers/firmware/google/coreboot_table.h | 34 +- drivers/firmware/google/mm_blob.S | 20 + drivers/firmware/google/mm_handler/Makefile | 51 ++ .../firmware/google/mm_handler/handler.lds.S | 46 ++ .../firmware/google/mm_handler/mm_handler.S | 510 ++++++++++++++++++ .../firmware/google/mm_handler/mm_handler.h | 21 + .../firmware/google/mm_handler/mm_header.S | 19 + drivers/firmware/google/mm_info.c | 63 +++ drivers/firmware/google/mm_loader.c | 186 +++++++ drivers/firmware/google/mm_payload.h | 58 ++ 12 files changed, 1020 insertions(+), 12 deletions(-) create mode 100644 drivers/firmware/google/mm_blob.S create mode 100644 drivers/firmware/google/mm_handler/Makefile create mode 100644 drivers/firmware/google/mm_handler/handler.lds.S create mode 100644 drivers/firmware/google/mm_handler/mm_handler.S create mode 100644 drivers/firmware/google/mm_handler/mm_handler.h create mode 100644 drivers/firmware/google/mm_handler/mm_header.S create mode 100644 drivers/firmware/google/mm_info.c create mode 100644 drivers/firmware/google/mm_loader.c create mode 100644 drivers/firmware/google/mm_payload.h -- 2.49.0