[Qemu-devel] [PATCH V6 0/2] hw/pci: reserve IO and mem for pci-2-pci bridges with no devices attached

[Marcel Apfelbaum]

v5 -> v6:
 - Minor, fixed a typo in the subject

v4 -> v5
 - Addressed Michael S. Tsirkin's comments (patch 2/2):
   - Open-coded pci_config_is_reserved() method.

v3 -> v4:
 - Addressed Kevin O'Connor's comments:
   - Refactored a for loop in patch 1/2.
 - Addressed Michael S. Tsirkin's comments (patch 2/2):
   - Removed not needed method
   - Test only base registers (dropped limits tests)
   - Renamed a helper method
   - Used 0xFF to test if the memory is reserved
   - Simplified code in pci_bridge_has_region
 - I did keep the code that restores base's address as I don't want
   to modify the registers in a 'query' method. (as replied on the mail thread)

v2 -> v3:
 - Addressed Michael S. Tsirkin's comments:
   - I/O and Prefetchable Memory are optional. Do not allocate ranges
     if they are not implemented (2/2).
 - Note that 2/2 patch can be seen as a separate fix. However, it
   is related to ranges reservation.

v1 -> v2:
 - Thanks Gerd Hoffmann for the review.
 - Addressed Michael S. Tsirkin's comments:
   - Limit capabilities query to 256 iterations, to make sure we
     don't get into an infinite loop with a broken device.


If a pci-2-pci bridge supports hot-plug functionality but there are no devices
connected to it, reserve IO/mem in order to be able to attach devices
later. Do not waste space, use minimum allowed.

Marcel Apfelbaum (2):
  hw/pci: reserve IO and mem for pci-2-pci bridges with no devices
    attached
  hw/pci: check if pci2pci bridges implement optional limit registers

 src/fw/pciinit.c | 12 +++++-------
 src/hw/pci.c     | 45 +++++++++++++++++++++++++++++++++++++++++++++
 src/hw/pci.h     | 10 ++++++++++
 3 files changed, 60 insertions(+), 7 deletions(-)

-- 
1.8.3.1