[PATCH v2 0/6] virt: Add Bao hypervisor IPC and I/O dispatcher drivers

[joaopeixoto at osyx.tech]

From: João Peixoto <joaopeixoto at osyx.tech>

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