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Wed, 07 Jan 2026 08:29:26 -0800 (PST) From: joaopeixoto@osyx.tech To: linux-kernel@vger.kernel.org Cc: ajd@linux.ibm.com, alex@ghiti.fr, aou@eecs.berkeley.edu, bagasdotme@gmail.com, catalin.marinas@arm.com, conor+dt@kernel.org, corbet@lwn.net, dan.j.williams@intel.com, davidmcerdeira@osyx.tech, devicetree@vger.kernel.org, dev@kael-k.io, gregkh@linuxfoundation.org, haren@linux.ibm.com, heiko@sntech.de, joaopeixoto@osyx.tech, jose@osyx.tech, kever.yang@rock-chips.com, krzk+dt@kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, maddy@linux.ibm.com, mani@kernel.org, nathan@kernel.org, neil.armstrong@linaro.org, palmer@dabbelt.com, pjw@kernel.org, prabhakar.mahadev-lad.rj@bp.renesas.com, robh@kernel.org, will@kernel.org Subject: [PATCH v2 0/6] virt: Add Bao hypervisor IPC and I/O dispatcher drivers Date: Wed, 7 Jan 2026 16:28:23 +0000 Message-ID: <20260107162829.416885-1-joaopeixoto@osyx.tech> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251224135217.25350-1-joaopeixoto@osyx.tech> References: <20251224135217.25350-1-joaopeixoto@osyx.tech> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: João Peixoto This series introduces support for Bao hypervisor guest-side drivers under drivers/virt/bao, along with the associated Device Tree bindings, UAPI headers, and MAINTAINERS entries. Bao is a lightweight static-partitioning hypervisor for embedded and safety-critical systems. This series adds: - Bao IPC shared memory driver: Enables Linux guests to communicate with each other via shared memory regions. - Bao I/O Dispatcher driver: Allows Bao VMs to share I/O devices using device paravirtualization (VirtIO). Key updates in this version to align with upstream requirements: 1. Switched to misc device API: Removed all cdev, class, and alloc_chrdev_region code in favor of misc_register() for simpler, standard device management. 2. Clean kernel style and formatting: All code passes checkpatch.pl, with consistent variable declaration, function naming, and comment style. 3. Architecture abstraction: Consolidated ARM, ARM64, and RISC-V hypercall logic into architecture-specific headers, removing in-driver #ifdefs. 4. Commit messages: Now concise and Linux-kernel-style, describing behavior and impact clearly. 5. Device Tree compliance: Fixed all make dt_binding_check errors to ensure DT binding correctness. This series has been validated on Linux guests running under Bao hypervisor, confirming correct initialization, IPC shared-memory read/write operations, and I/O Dispatcher functionality for backend VMs. Feedback and review from maintainers of virtualization, architecture-specific code (ARM, ARM64, RISC-V), Device Tree bindings, and UAPI are welcome. João Peixoto (6): dt-bindings: Add Bao IPC shared memory driver binding virt: bao: Add Bao IPC shared memory driver dt-bindings: Add Bao I/O dispatcher driver binding virt: bao: Add Bao I/O dispatcher driver virt: bao: Move BAO_IPCSHMEM_HYPERCALL_ID to common header MAINTAINERS: Add entries for Bao hypervisor drivers, headers, and DT bindings .../bindings/bao/bao,io-dispatcher.yaml | 75 ++++ .../devicetree/bindings/bao/bao,ipcshmem.yaml | 82 ++++ .../devicetree/bindings/vendor-prefixes.yaml | 2 + .../userspace-api/ioctl/ioctl-number.rst | 2 + MAINTAINERS | 13 + arch/arm/include/asm/bao.h | 60 +++ arch/arm64/include/asm/bao.h | 60 +++ arch/riscv/include/asm/bao.h | 60 +++ drivers/virt/Kconfig | 2 + drivers/virt/Makefile | 2 + drivers/virt/bao/Kconfig | 5 + drivers/virt/bao/Makefile | 4 + drivers/virt/bao/io-dispatcher/Kconfig | 15 + drivers/virt/bao/io-dispatcher/Makefile | 4 + drivers/virt/bao/io-dispatcher/bao_drv.h | 361 ++++++++++++++++ drivers/virt/bao/io-dispatcher/dm.c | 405 ++++++++++++++++++ drivers/virt/bao/io-dispatcher/driver.c | 185 ++++++++ drivers/virt/bao/io-dispatcher/intc.c | 64 +++ drivers/virt/bao/io-dispatcher/io_client.c | 405 ++++++++++++++++++ .../virt/bao/io-dispatcher/io_dispatcher.c | 179 ++++++++ drivers/virt/bao/io-dispatcher/ioeventfd.c | 323 ++++++++++++++ drivers/virt/bao/io-dispatcher/irqfd.c | 314 ++++++++++++++ drivers/virt/bao/ipcshmem/Kconfig | 8 + drivers/virt/bao/ipcshmem/Makefile | 3 + drivers/virt/bao/ipcshmem/ipcshmem.c | 252 +++++++++++ include/linux/bao.h | 44 ++ include/uapi/linux/bao.h | 98 +++++ 27 files changed, 3027 insertions(+) create mode 100644 Documentation/devicetree/bindings/bao/bao,io-dispatcher.yaml create mode 100644 Documentation/devicetree/bindings/bao/bao,ipcshmem.yaml create mode 100644 arch/arm/include/asm/bao.h create mode 100644 arch/arm64/include/asm/bao.h create mode 100644 arch/riscv/include/asm/bao.h create mode 100644 drivers/virt/bao/Kconfig create mode 100644 drivers/virt/bao/Makefile create mode 100644 drivers/virt/bao/io-dispatcher/Kconfig create mode 100644 drivers/virt/bao/io-dispatcher/Makefile create mode 100644 drivers/virt/bao/io-dispatcher/bao_drv.h create mode 100644 drivers/virt/bao/io-dispatcher/dm.c create mode 100644 drivers/virt/bao/io-dispatcher/driver.c create mode 100644 drivers/virt/bao/io-dispatcher/intc.c create mode 100644 drivers/virt/bao/io-dispatcher/io_client.c create mode 100644 drivers/virt/bao/io-dispatcher/io_dispatcher.c create mode 100644 drivers/virt/bao/io-dispatcher/ioeventfd.c create mode 100644 drivers/virt/bao/io-dispatcher/irqfd.c create mode 100644 drivers/virt/bao/ipcshmem/Kconfig create mode 100644 drivers/virt/bao/ipcshmem/Makefile create mode 100644 drivers/virt/bao/ipcshmem/ipcshmem.c create mode 100644 include/linux/bao.h create mode 100644 include/uapi/linux/bao.h -- 2.43.0