[Qemu-devel] [PATCH 0/3] Towards vfio-base VGA device assignment

[Alex Williamson]

This is the companion series to the vfio-pci kernel series for VGA
support.  Combined, these don't do as much as you'd hope.  Patch 1
is simpy a header update for the matching vfio kernel changes.
Patch 2 is the meat of the changes, enabling vfio-pci to claim access
to VGA ranges and pass them through to the kernel.  The last patch
is a hard coded hack specific to my system and only known to be
needed on a Radeon HD5450 where there seems to be a backdoor for the
VGA BIOS to find the physical address of the device (physical devices
is at 0x4000, virtual device is at 0xc000).

With this and the kernel patch, some devices are able to get through
VGA bios execution.  The HD5450 can even sync the monitor and show the
correct thing on the screen if you run something that uses VGA graphic
mode.  Seabios seems to think VBE works, but for some reason VGA text
mode doesn't work, the monitor turns off.  So, like the kernel side,
I'm posting these for archival purposes and with hopes that someone
may have some ideas on what's still missing.  Thanks,

Alex

---

Alex Williamson (3):
      qemu: [NOT FOR COMMIT] Update linux headers for vfio VGA
      vfio-pci: [NOT FOR COMMIT] Add support for VGA MMIO and I/O port access
      vfio-pci: [NOT FOR COMMIT] Hack around HD5450 I/O port backdoor


 hw/vfio_pci.c                        |  182 ++++++++++++++++++++++++++++++++++
 linux-headers/asm-powerpc/kvm.h      |   86 ++++++++++++++++
 linux-headers/asm-powerpc/kvm_para.h |   13 +-
 linux-headers/linux/kvm.h            |   21 +++-
 linux-headers/linux/kvm_para.h       |    6 +
 linux-headers/linux/vfio.h           |    9 +-
 linux-headers/linux/virtio_config.h  |    6 +
 linux-headers/linux/virtio_ring.h    |    6 +
 8 files changed, 305 insertions(+), 24 deletions(-)