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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Actually CC'ing xen-devel

On Fri, 11 Dec 2015, Stefano Stabellini wrote:
> 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
> > 
> > 
> 

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