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 -- 1.8.3.1
