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

[Stefano Stabellini]

On Tue, 8 Dec 2015, Gerd Hoffmann wrote:
>   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 ...).

I for one don't have a setup to be able to test this at the moment. But
I would appreciate if this kind of changes were Tested-by Tiejun Chen.


> 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
> 
>