[Qemu-devel] [PATCH 0/7] igd passthrough chipset tweaks

[Gerd Hoffmann]

  Hi,

We have some code in our tree to support pci passthrough of intel
graphics devices (igd) on xen, which requires some chipset tweaks
for (a) the host bridge and (b) the lpc/isa-bridge to meat the
expectations of the guest driver.  For kvm we need pretty much
the same, also the requirements for vgpu (xengt/kvmgt) are very
simliar.

This patch series tackles (a) only, (b) will follow later.  It
wires up the igd-passthru machine option for tcg/kvm too, moves
the code to its own file so it is nicely separated, fixes a bunch
of issues and finally adds q35 support.

This patch series has seen very light testing, basically doing
lspci in the guest to check whenever pci config space got updated
correctly.  Trying actual device assignment needs more pieces
being in place.  But I suspect even that is more testing than
the code has seen on xen so far (see patch #6 ...).

cheers,
  Gerd

Gerd Hoffmann (7):
  pc: wire up TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE for !xen
  pc: move igd support code to igd.c
  igd: switch TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE to realize
  igd: TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE: call parent realize
  igd: use defines for standard pci config space offsets
  igd: revamp host config read
  igd: add q35 support

 hw/i386/pc_piix.c         |  11 ++--
 hw/pci-host/Makefile.objs |   3 ++
 hw/pci-host/igd.c         | 132 ++++++++++++++++++++++++++++++++++++++++++++++
 hw/pci-host/piix.c        |  88 -------------------------------
 hw/pci-host/q35.c         |   6 ++-
 5 files changed, 145 insertions(+), 95 deletions(-)
 create mode 100644 hw/pci-host/igd.c

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1.8.3.1