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[v2,0/2] nubus: add nubus-virtio-mmio device

Message ID 20240108192013.272112-1-mark.cave-ayland@ilande.co.uk (mailing list archive)
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Series nubus: add nubus-virtio-mmio device | expand

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Mark Cave-Ayland Jan. 8, 2024, 7:20 p.m. UTC 
This series introduces a new nubus-virtio-mmio device which can be plugged into
the q800 machine to enable a 68k Classic MacOS guest to access virtio devices
such as virtio-9p-device (host filesharing), virtio-gpu (extended framebuffer
support) and virtio-tablet-device (absolute positioning).

Once the nubus-virtio-mmio device has been plugged into the q800 machine, virtio
devices can be accessed by a Classic MacOS guest using the drivers from the
classicvirtio project at https://github.com/elliotnunn/classicvirtio.

The nubus-virtio-mmio device is purposefully designed to be similar to the
virtio-mmio interface used by the existing 68k virt machine, making use of a
similar memory layout and the goldfish PIC for simple interrupt management. The
main difference is that only a single goldfish PIC is used, however that still
allows up to 32 virtio devices to be connected using a single nubus card.

Patch 1 fixes an alignment bug in the existing nubus-device Declaration ROM code
whereby some ROM images could trigger an assert() in QEMU, whilst patch 2 adds
the nubus-virtio-mmio device itself.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

v2:
- Rebase onto master
- Adjust comment in patch 1 as suggested by Phil


Mark Cave-Ayland (2):
  nubus-device: round Declaration ROM memory region address to
    qemu_target_page_size()
  nubus: add nubus-virtio-mmio device

 hw/nubus/meson.build                 |   1 +
 hw/nubus/nubus-device.c              |  16 +++--
 hw/nubus/nubus-virtio-mmio.c         | 102 +++++++++++++++++++++++++++
 include/hw/nubus/nubus-virtio-mmio.h |  36 ++++++++++
 4 files changed, 151 insertions(+), 4 deletions(-)
 create mode 100644 hw/nubus/nubus-virtio-mmio.c
 create mode 100644 include/hw/nubus/nubus-virtio-mmio.h