[Qemu-devel] PCI: how handle multifunction / compound devices best?

[Gerd Hoffmann <kraxel@redhat.com>]

  Hi folks,

I'm still looking for a sane way to handle multifunction pci devices,
specifically a EHCI USB controller with UHCI companion controllers.

Here comes a small (incomplete[1]) two patch series to make the issue
more clear.  The first patch adds a function which creates all devices
with the properties set as needed.  The second patch adds a '-usb2'
switch to windup this in a user-friendly way.

Adding a -usb2 switch sucks though.  I'd prefer to have some way to
create such devices via -device, but without asking the user to create
all functions individually on the command line, i.e. have something
along the lines of ...

 qemu -device ich9-usb,slot=08

... instead of ...

 qemu \
  -device ich9-usb-ehci1,addr=08.7,multifunction=on,id=ehci \
  -device ich9-usb-uhci1,addr=08.0,multifunction=on,masterbus=ehci.0,firstport=0 \
  -device ich9-usb-uhci2,addr=08.1,multifunction=on,masterbus=ehci.0,firstport=2 \
  -device ich9-usb-uhci3,addr=08.2,multifunction=on,masterbus=ehci.0,firstport=4

Suggestions?

cheers,
  Gerd

[1] full series @ http://www.kraxel.org/cgit/qemu/log/?h=usb.18

Gerd Hoffmann (2):
  usb: add ich9_ehci_with_companion_init()
  usb: windup ich9_ehci_with_companion_init via -usb2 switch.

 hw/pc_piix.c    |   14 ++++++++++----
 hw/usb-ehci.c   |   49 +++++++++++++++++++++++++++++++++++++++++++++++++
 hw/usb.h        |    3 +++
 qemu-options.hx |   13 +++++++++++--
 vl.c            |    3 +++
 5 files changed, 76 insertions(+), 6 deletions(-)