The PCI representation in QEMU has recently been extended for S390
allowing configuration of zPCI attributes like uid (user-defined
identifier) and fid (PCI function identifier).
The details can be found here:
https://lists.gnu.org/archive/html/qemu-devel/2016-06/msg07262.html

To support the new zPCI feature of the S390 platform, two new XML
attributes, @uid and @fid, are introduced for device addresses of type
'pci', i.e.:
  <hostdev mode='subsystem' type='pci'>
    <driver name='vfio'/>
    <source>
      <address domain='0x0001' bus='0x00' slot='0x00' function='0x0'/>
    </source>
    <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'
      uid='0x0003' fid='0x00000027'/>
  </hostdev>

uid and fid are optional attributes. If they are defined by the user,
unique values within the guest domain must be used. If they are not
specified and the architecture requires them, they are automatically
generated with non-conflicting values.

Current implementation is the most seamless one for the user as it
unites the address specific data of a PCI device on one XML element.
It could accommodate both specifying our special parameters (uid and fid)
and re-using standard statements (domain, bus, slot and function) for
PCI devices. User can still specify bus/slot/function for the virtualized
PCI devices in the XML.

Thus uid/fid act as an extension to the PCI address and are stored in
a new structure 'virZPCIDeviceAddress' which is a member of common PCI
Address structure. Additionally, two hashtables are used for assignment
and reservation of uid/fid.

In support of extending the PCI address, a new PCI address extension flag is
introduced. This extension flag allows is not only dedicated for the S390
platform but also other architectures needing certain extensions to PCI
address space.

Yi Min Zhao (13):
  conf: Add definitions for 'uid' and 'fid' PCI address attributes
  qemu: Introduce zPCI capability
  conf: Introduce a new PCI address extension flag
  qemu: Enable PCI multi bus for S390 guests
  qemu: Auto add pci-root for s390/s390x guests
  qemu: Generate and use zPCI device in QEMU command line
  qemu: Add hotpluging support for PCI devices on S390 guests
  conf: Introduce parser, formatter for uid and fid
  conf: Introduce address caching for PCI extensions
  conf: Allocate/release 'uid' and 'fid' in PCI address
  tests: Add new tests for zPCI
  docs: Add 'uid' and 'fid' information
  news: Update news for PCI address extension attributes

 docs/formatdomain.html.in                          |   9 +-
 docs/news.xml                                      |  11 +
 docs/schemas/basictypes.rng                        |  28 ++
 docs/schemas/domaincommon.rng                      |   1 +
 src/conf/device_conf.c                             |  74 +++++
 src/conf/device_conf.h                             |   1 +
 src/conf/domain_addr.c                             | 346 +++++++++++++++++++++
 src/conf/domain_addr.h                             |  29 ++
 src/conf/domain_conf.c                             |   4 +
 src/libvirt_private.syms                           |   4 +
 src/qemu/qemu_capabilities.c                       |   5 +
 src/qemu/qemu_capabilities.h                       |   1 +
 src/qemu/qemu_command.c                            | 104 +++++++
 src/qemu/qemu_command.h                            |   4 +
 src/qemu/qemu_domain.c                             |   1 +
 src/qemu/qemu_domain_address.c                     | 183 ++++++++++-
 src/qemu/qemu_hotplug.c                            | 175 ++++++++++-
 src/util/virpci.h                                  |  13 +
 tests/qemucapabilitiesdata/caps_2.10.0.s390x.xml   |   1 +
 tests/qemucapabilitiesdata/caps_2.11.0.s390x.xml   |   1 +
 tests/qemucapabilitiesdata/caps_2.12.0.s390x.xml   |   1 +
 tests/qemucapabilitiesdata/caps_2.7.0.s390x.xml    |   1 +
 tests/qemucapabilitiesdata/caps_2.8.0.s390x.xml    |   1 +
 tests/qemucapabilitiesdata/caps_2.9.0.s390x.xml    |   1 +
 tests/qemuxml2argvdata/disk-virtio-s390-zpci.args  |  27 ++
 tests/qemuxml2argvdata/disk-virtio-s390-zpci.xml   |  17 +
 .../hostdev-vfio-zpci-autogenerate.args            |  24 ++
 .../hostdev-vfio-zpci-autogenerate.xml             |  18 ++
 .../hostdev-vfio-zpci-boundaries.args              |  27 ++
 .../hostdev-vfio-zpci-boundaries.xml               |  26 ++
 .../hostdev-vfio-zpci-multidomain-many.args        |  38 +++
 .../hostdev-vfio-zpci-multidomain-many.xml         |  67 ++++
 tests/qemuxml2argvdata/hostdev-vfio-zpci.args      |  24 ++
 tests/qemuxml2argvdata/hostdev-vfio-zpci.xml       |  19 ++
 tests/qemuxml2argvtest.c                           |  21 ++
 tests/qemuxml2xmloutdata/disk-virtio-s390-zpci.xml |  29 ++
 tests/qemuxml2xmloutdata/hostdev-vfio-zpci.xml     |  30 ++
 tests/qemuxml2xmltest.c                            |   3 +
 38 files changed, 1347 insertions(+), 22 deletions(-)
 create mode 100644 tests/qemuxml2argvdata/disk-virtio-s390-zpci.args
 create mode 100644 tests/qemuxml2argvdata/disk-virtio-s390-zpci.xml
 create mode 100644 tests/qemuxml2argvdata/hostdev-vfio-zpci-autogenerate.args
 create mode 100644 tests/qemuxml2argvdata/hostdev-vfio-zpci-autogenerate.xml
 create mode 100644 tests/qemuxml2argvdata/hostdev-vfio-zpci-boundaries.args
 create mode 100644 tests/qemuxml2argvdata/hostdev-vfio-zpci-boundaries.xml
 create mode 100644 tests/qemuxml2argvdata/hostdev-vfio-zpci-multidomain-many.args
 create mode 100644 tests/qemuxml2argvdata/hostdev-vfio-zpci-multidomain-many.xml
 create mode 100644 tests/qemuxml2argvdata/hostdev-vfio-zpci.args
 create mode 100644 tests/qemuxml2argvdata/hostdev-vfio-zpci.xml
 create mode 100644 tests/qemuxml2xmloutdata/disk-virtio-s390-zpci.xml
 create mode 100644 tests/qemuxml2xmloutdata/hostdev-vfio-zpci.xml

-- 
2.16.3

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