[PATCH v3 0/2] pci: slot_reserved_mask improvements

[Chuck Zmudzinski <brchuckz@xxxxxxx>]

This patch series consists of two patches. The first provides accessor
functions in pci.h to avoid direct access of slot_reserved_mask
according to the comment at the top of include/hw/pci/pci_bus.h. No
functional change is intended with this patch.

The second patch replaces slot_reserved_mask with two new masks,
slot_reserved_auto_mask and slot_reserved_manual_mask so the current
behavior of reserving slot 2 for the Intel IGD for the xenfv machine
will be ignored if an administrator manually configures a device to use
the reserved slot.

The current behavior of always reserving slots in the sun4u machine is
preserved by this patch series; the patch series only changes how
slot_reserved_mask works in the xenfv machine. Although the patch
series can affect xenfv machines configured for igd-passthru if an
administrator assigns some of the pci slot addresses manually, it
does not affect the libxl default configuration for igd-passthru because
libxl uses automatic slot assignment by default.

Testing:
   - Tested xenfv/igd with both manual and auto slot allocation - behaves as 
expected
   - Verified that qemu-system-sparc64 still compiles with the patches to 
sun4u.c
   - xen4u machine not tested -- Mark, can you do this?

Link: 
https://lore.kernel.org/qemu-devel/20230106064838-mutt-send-email-mst@xxxxxxxxxx/

Chuck Zmudzinski (2):
  pci: avoid accessing slot_reserved_mask directly outside of pci.c
  pci: introduce slot_reserved_auto_mask and slot_reserved_manual_mask

Changelog

v3: Re-work second patch in response to comments/discussion of v2

v2: Add first patch and cover letter to make this a 2-patch series
    Make changes to the second patch (see second patch for changelog)

 hw/pci/pci.c             | 32 +++++++++++++++++++++++++++-----
 hw/sparc64/sun4u.c       |  7 +++----
 hw/xen/xen_pt.c          |  7 +++----
 include/hw/pci/pci.h     |  3 +++
 include/hw/pci/pci_bus.h |  3 ++-
 5 files changed, 38 insertions(+), 14 deletions(-)

-- 
2.39.2