[PATCH v2 0/5] pci/iommu: Fail early if vfio-pci detected before vIOMMU

[Peter Xu <peterx@redhat.com>]

Note that patch 1-4 are cleanups for pci subsystem, and patch 5 is a fix to
fail early for mis-ordered qemu cmdline on vfio and vIOMMU.  Logically they
should be posted separately and they're not directly related, however to make
it still correlated to v1 I kept them in the same patchset.

In this version I used pre_plug() hook for q35 to detect the ordering issue as
Igor suggested, meanwhile it's done via object_resolve_path_type() rather than
scanning the pci bus as Michael suggested.

Please review, thanks.

v2 changelog:
- Picked up r-b where I can
- Merged patch 1 & 4, 2 & 3, 5 & 6
- s/pci_root_bus_args/PCIRootBusArgs/ [David, Michael]
- Replace "void* " with "void *" in pci.h [Phil]
- Dropped "pci: Add pci_for_each_device_all()"
- Dropped "x86-iommu: Fail early if vIOMMU specified after vfio-pci"
- Added "qom: object_child_foreach_recursive_type()"
- Added "pc/q35: Add pre-plug hook for x86-iommu"

v1: https://lore.kernel.org/qemu-devel/20211021104259.57754-1-peterx@redhat.com/

Peter Xu (5):
  pci: Define pci_bus_dev_fn/pci_bus_fn/pci_bus_ret_fn
  pci: Export pci_for_each_device_under_bus*()
  qom: object_child_foreach_recursive_type()
  pci: Add pci_for_each_root_bus()
  pc/q35: Add pre-plug hook for x86-iommu

 hw/arm/virt-acpi-build.c    | 31 ++++++++--------------
 hw/i386/acpi-build.c        | 39 +++++++---------------------
 hw/i386/pc.c                |  4 +++
 hw/i386/x86-iommu.c         | 14 ++++++++++
 hw/pci/pci.c                | 52 +++++++++++++++++++++++++------------
 hw/pci/pcie.c               |  4 +--
 hw/ppc/spapr_pci.c          | 12 ++++-----
 hw/ppc/spapr_pci_nvlink2.c  |  7 +++--
 hw/ppc/spapr_pci_vfio.c     |  4 +--
 hw/s390x/s390-pci-bus.c     |  5 ++--
 hw/xen/xen_pt.c             |  4 +--
 include/hw/i386/x86-iommu.h |  8 ++++++
 include/hw/pci/pci.h        | 26 ++++++++++++-------
 include/qom/object.h        | 20 ++++++++++++++
 qom/object.c                | 27 +++++++++++++++++++
 15 files changed, 160 insertions(+), 97 deletions(-)

-- 
2.32.0