[Qemu-devel] [PATCH v5 0/1] s390 pci infrastructure modeling

[Yi Min Zhao <zyimin@linux.vnet.ibm.com>]

From: Yi Min Zhao <zyimin@linux.vnet.ibm.com>

This patch extends the current s390 pci implementation to provide more 
flexibility in configuration of s390 specific device handling.

For each vfio pci device, I create a zpci device to store s390 specific
informations. And attach all of these special zpci devices to the s390 
facility bus. A zpci device references the corresponding PCI device via
device id. 

The new design allows to define multiple host bridges, each host bridge
could hold 32 zpci devices at most. Add a new property named index to 
s390-pcihost device and must assign a unique value to it in qemu command
line.

The topology for this implementation could be:

  dev: s390-pcihost, id ""
    index=1
    bus: pci.0
      type PCI
      dev: vfio-pci, id "vpci1"
        host = "0000:00:00.0"
	......
      dev: vfio-pci, id "vpci2"
        host = "0001:00:00.0"
	......
  dev: s390-pci-facility, id ""
    bus: s390-pci-fac-bus.0
      type s390-pci-fac-bus
      dev: zpci, id "zpci1"
        fid = 1 (0x1)
        uid = 2 (0x2)
        pci_id = "vpci1"
      dev: zpci, id "zpci2"
        fid = 6 (0x6)
        uid = 7 (0x7)
        pci_id = "vpci2"

To make the review easier, I keep all of the old names, such as 
S390PCIBusDevice to name a zpci device. I will make a cleanup 
patch later to change these names to a more suitable name.

Comparing to v4, this patch does the following change:
1.Add index property to s390-pcihost device.
2.Add index to s390PCIBusDevice. Its value is assigned by logical
  OR s390-pcihost device's index and pci slot.
3.Add three usable macros to get zpci index and s390pcihost index.
4.Add a bool member to s390PCIBustDevice named "available" to judge
  whether the relationship of zpci and vfio pci is established. 
  This change fixed a bug generated by previous code in case that
  only define zpci device and then hot unplug it will fail.
5.Rework s390_pci_find_dev_by_idx function.
6.Rework s390_pci_device_hot_unplug_request function to be more
  stable.
7.Rework s390_pci_device_unrealize function to make the process of
  pci device unplug more logical and stable. 

Comparing to v3, this patch does the following change:
1.Exchange vfio-pci and zpci definitions. Define zpci device firstly
  then define vfio-pci device.
2.Unplug either vfio-pci device or zpci device can remove both of them.

Yi Min Zhao (1):
  s390x: pci infrastructure modeling

 hw/s390x/s390-pci-bus.c    |  379 ++++++++++++++++++++++++++++++++++----------
 hw/s390x/s390-pci-bus.h    |   54 ++++++-
 hw/s390x/s390-pci-inst.c   |   80 ++++++----
 hw/s390x/s390-virtio-ccw.c |    5 +-
 4 files changed, 392 insertions(+), 126 deletions(-)

-- 
1.7.9