[libvirt] [PATCH v7 00/14] PCI passthrough support on s390

Yi Min Zhao zyimin at linux.ibm.com
Fri Oct 19 03:40:06 UTC 2018 

Abstract
========
The PCI representation in QEMU has 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, a new element of
PCI address is introduced. It has two optional attributes, @uid and
@fid. For example:
  <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'>
      <zpci uid='0x0003' fid='0x00000027'/>
    </address>
  </hostdev>

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.

zPCI address as an extension of the PCI address 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 zPCI 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.

Code Base
=========
commit in master:
3a1cdb06fd conf: Fix bug in finding alloc through matching vcpus

Change Log
==========
v6->v7:
1. Optimize some functions' names and code logic.
2. Fixup build error.
3. Add negative test case for patch 9.
4. Use virXMLFormatElement() in virDomainDeviceInfoFormat().

v5->v6:
1. Modify zPCI XML definition.
2. Optimize the logic of zPCI address assignment and reservation.
3. Add extension flag into PCI address structure.
4. Update commit messages.

v4->v5:
1. Update the version number.
2. Fixup code style error.
3. Separate qemu code into single patch.
4. Rebase the patches to the new code of master branch.

v3->v4:
1. Update docs.
2. Format code style.
3. Optimize zPCI support check.
4. Move the check of zPCI defined in xml but unsupported by Qemu to
   qemuDomainDeviceDefValidate().
5. Change zpci address member of PCI address struct from pointer to
   instance.
6. Modify zpci address definition principle. Currently the user must
   either define both of uid and fid or not.

v2->v3:
1. Revise code style.
2. Update test cases.
3. Introduce qemuDomainCollectPCIAddressExtension() to collect PCI
   extension addresses.
4. Introduce virDeviceInfoPCIAddressExtensionPresent() to check if zPCI
   address exists.
5. Optimize zPCI address check logic.
6. Optimize passed parameters of zPCI addr alloc/release/reserve functions.
7. Report enum range error in qemuDomainDeviceSupportZPCI().
8. Update commit messages.

v1->v2:
1. Separate test commit and merge testcases into corresponding commits that
   introduce the functionalities firstly.
2. Spare some checks for zpci device.
3. Add vsock and controller support.
4. Add uin32 type schema.
5. Rename zpciuid and zpcifid to zpci_uid and zpci_fid.
6. Always return multibus support on S390.

Yi Min Zhao (14):
  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
  conf: Introduce address caching for PCI extensions
  conf: use virXMLFormatElement() in virDomainDeviceInfoFormat()
  conf: Introduce parser, formatter for uid and fid
  qemu: Add zPCI address definition check
  conf: Allocate/release 'uid' and 'fid' in PCI address
  qemu: Generate and use zPCI device in QEMU command line
  qemu: Add hotpluging support for PCI devices on S390 guests
  docs: Add 'uid' and 'fid' information
  news: Update news for PCI address extension attributes

 cfg.mk                                        |   1 +
 docs/formatdomain.html.in                     |  10 +-
 docs/news.xml                                 |  11 +
 docs/schemas/basictypes.rng                   |  27 ++
 docs/schemas/domaincommon.rng                 |   1 +
 src/bhyve/bhyve_device.c                      |   3 +-
 src/conf/device_conf.c                        |  69 ++++
 src/conf/device_conf.h                        |   7 +
 src/conf/domain_addr.c                        | 340 +++++++++++++++++-
 src/conf/domain_addr.h                        |  27 +-
 src/conf/domain_conf.c                        |  50 ++-
 src/libvirt_private.syms                      |   7 +
 src/qemu/qemu_capabilities.c                  |   6 +
 src/qemu/qemu_capabilities.h                  |   1 +
 src/qemu/qemu_command.c                       | 104 ++++++
 src/qemu/qemu_command.h                       |   2 +
 src/qemu/qemu_domain.c                        |  37 ++
 src/qemu/qemu_domain_address.c                | 205 ++++++++++-
 src/qemu/qemu_hotplug.c                       | 160 ++++++++-
 src/util/virpci.c                             |  26 ++
 src/util/virpci.h                             |  15 +
 .../caps_2.10.0.s390x.xml                     |   1 +
 .../caps_2.11.0.s390x.xml                     |   1 +
 .../caps_2.12.0.s390x.xml                     |   1 +
 .../qemucapabilitiesdata/caps_2.7.0.s390x.xml |   1 +
 .../qemucapabilitiesdata/caps_2.8.0.s390x.xml |   1 +
 .../qemucapabilitiesdata/caps_2.9.0.s390x.xml |   1 +
 .../qemucapabilitiesdata/caps_3.0.0.s390x.xml |   1 +
 .../disk-virtio-s390-zpci.args                |  26 ++
 .../disk-virtio-s390-zpci.xml                 |  19 +
 .../hostdev-vfio-zpci-autogenerate.args       |  25 ++
 .../hostdev-vfio-zpci-autogenerate.xml        |  18 +
 .../hostdev-vfio-zpci-boundaries.args         |  29 ++
 .../hostdev-vfio-zpci-boundaries.xml          |  30 ++
 .../hostdev-vfio-zpci-multidomain-many.args   |  39 ++
 .../hostdev-vfio-zpci-multidomain-many.xml    |  79 ++++
 .../hostdev-vfio-zpci-wrong-arch.xml          |  34 ++
 tests/qemuxml2argvdata/hostdev-vfio-zpci.args |  25 ++
 tests/qemuxml2argvdata/hostdev-vfio-zpci.xml  |  21 ++
 tests/qemuxml2argvtest.c                      |  22 ++
 .../disk-virtio-s390-zpci.xml                 |  31 ++
 .../hostdev-vfio-zpci-autogenerate.xml        |  34 ++
 .../hostdev-vfio-zpci-boundaries.xml          |  48 +++
 .../hostdev-vfio-zpci-multidomain-many.xml    |  97 +++++
 .../qemuxml2xmloutdata/hostdev-vfio-zpci.xml  |  32 ++
 tests/qemuxml2xmltest.c                       |  17 +
 46 files changed, 1707 insertions(+), 35 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-wrong-arch.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-autogenerate.xml
 create mode 100644 tests/qemuxml2xmloutdata/hostdev-vfio-zpci-boundaries.xml
 create mode 100644 tests/qemuxml2xmloutdata/hostdev-vfio-zpci-multidomain-many.xml
 create mode 100644 tests/qemuxml2xmloutdata/hostdev-vfio-zpci.xml

-- 
Yi Min

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