[PATCH 0/8] pci/iommu: Fail early if vfio-pci detected before vIOMMU

[Peter Xu <peterx@redhat.com>]

This series overrides one previous patchset:

https://lore.kernel.org/qemu-devel/20210818194217.110451-1-peterx@redhat.com/

I started from v1 because obviously it's completely different way of doing the
same thing, hence versioning upon it would be weird.

Patches 1-7 are majorly cleanups for current pci code to finally provide a
clean way to loop over all the pci devices on the system.

Patch 8 uses the last helper pci_for_each_device_all() to loop over all the
devices during x86 vIOMMU realize() function to fail early if e.g. vfio-pci
devices are detected.  Although this is not exactly what Igor suggested but it
should be mostly the same approach, so I kept the Suggested-by credit.

Please review, thanks.

Peter Xu (8):
  pci: Define pci_bus_dev_fn type
  pci: Export pci_for_each_device_under_bus*()
  pci: Use pci_for_each_device_under_bus*()
  pci: Define pci_bus_fn/pci_bus_ret_fn type
  pci: Add pci_for_each_root_bus()
  pci: Use pci_for_each_root_bus() in current code
  pci: Add pci_for_each_device_all()
  x86-iommu: Fail early if vIOMMU specified after vfio-pci

 hw/arm/virt-acpi-build.c   | 31 ++++++---------
 hw/i386/acpi-build.c       | 39 +++++--------------
 hw/i386/x86-iommu.c        | 18 +++++++++
 hw/pci/pci.c               | 77 +++++++++++++++++++++++++++++---------
 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/pci/pci.h       | 28 +++++++++-----
 11 files changed, 132 insertions(+), 97 deletions(-)

-- 
2.32.0