[libvirt] [PATCH 0/8] Add iSCSI hostdev pass-through device

[John Ferlan]

https://bugzilla.redhat.com/show_bug.cgi?id=957293

Allow iSCSI <hostdev/> devices to be added similarly to the existing
<disk/> devices.  Initially do a little bit of refactoring of the
hostdev subsys structures to make it easier to model an iSCSI hostdev
after the SCSI scsi_host.  Although the bulk of the non-structure
changes are "technically unnecessary", it just looked nicer to see
{usb|pci|scsi}src rather than the longer "->source.subsys.u.{usb|pci|scsi}"
in many places in the code.

The end result is the guest will have /dev/sdX devices created.

I have run this code through my Coverity environment and will be
running the virttest suite over the weekend.

Patches 1-3 are repetitive moves of the various hostdev subsys types
(USB, PCI, and SCSI) into separate typedefs and then modifying code use
the Ptr instead of the long union path to each field.  I think I got
most, but I'm sure there's still a few that could be cleaned up or
that were added since I started this.

Patch 4 more or less redoes patch 3 and I suppose could be combined. I
left it separate because it's showing the progression to patch 6. This
patch uses 'scsihost' to reference the specific portions while still
using 'scsisrc' to reference the shared portion (which is only sgio).

Patch 5 adds a virConnectPtr since patch 6 will need a way to get the
secret value for the iSCSI secret/auth in qemuBuildSCSIHostdevDrvStr.

Patch 6 adds the qemu code to handle a new hostdev protocol type
VIR_DOMAIN_HOSTDEV_SCSI_PROTOCOL_TYPE_ISCSI. The code will mimic the
network disk (VIR_STORAGE_NET_PROTOCOL_ISCSI) code when making decisions.
The new 'scsisrc' field 'protocol' will be the decision point. The
default of VIR_DOMAIN_HOSTDEV_SCSI_PROTOCOL_TYPE_NONE was chosen
over TYPE_SCSI_HOST. The changes were made in this order to reduce
the size of the patch when the XML is added (patch 8). Most of the
code was done inline using the iscsisrc->protocol (when the iSCSI code
had nothing to do). The remaining changes refactored code into "SCSIHost" 
and "SCSIiSCSI" to process the differences.

Patch 7 just refactors domain_conf to add what will be a common routine
to handle the "<host/>" element network disks.  The iSCSI code will
reuse the code to have it's own element.

Patch 8 adds the XML, schema, and updates the docs to describe the
<hostdev/> entry as well as of course adding new tests.  The tests
are a copy/merge of the scsi_host and network iscsi tests to define
and describe the expected model.

John Ferlan (8):
  hostdev: Introduce virDomainHostdevSubsysUSB
  hostdev: Introduce virDomainHostdevSubsysPCI
  hostdev: Introduce virDomainHostdevSubsysSCSI
  hostdev: Introduce virDomainHostdevSubsysSCSIHost
  Add virConnectPtr for qemuBuildSCSIHostdevDrvStr
  hostdev: Introduce virDomainHostdevSubsysSCSIiSCSI
  domain_conf: Common routine to handle network storage host xml def
  hostdev: Add iSCSI hostdev XML

 docs/formatdomain.html.in                          | 142 +++++--
 docs/schemas/domaincommon.rng                      |  46 +-
 src/conf/domain_audit.c                            |  38 +-
 src/conf/domain_conf.c                             | 463 +++++++++++++++------
 src/conf/domain_conf.h                             |  80 +++-
 src/libxl/libxl_conf.c                             |   9 +-
 src/libxl/libxl_domain.c                           |   5 +-
 src/libxl/libxl_driver.c                           |  34 +-
 src/lxc/lxc_cgroup.c                               |   4 +-
 src/lxc/lxc_controller.c                           |  10 +-
 src/lxc/lxc_driver.c                               |  16 +-
 src/qemu/qemu_cgroup.c                             |  69 +--
 src/qemu/qemu_command.c                            | 158 ++++---
 src/qemu/qemu_command.h                            |   5 +-
 src/qemu/qemu_conf.c                               |  20 +-
 src/qemu/qemu_driver.c                             |   6 +-
 src/qemu/qemu_hotplug.c                            |  93 +++--
 src/qemu/qemu_hotplug.h                            |   9 +-
 src/security/security_apparmor.c                   |  33 +-
 src/security/security_dac.c                        |  66 +--
 src/security/security_selinux.c                    |  64 +--
 src/security/virt-aa-helper.c                      |   5 +-
 src/util/virhostdev.c                              | 295 +++++++------
 .../qemuxml2argv-hostdev-scsi-lsi-iscsi-auth.args  |  14 +
 .../qemuxml2argv-hostdev-scsi-lsi-iscsi-auth.xml   |  46 ++
 .../qemuxml2argv-hostdev-scsi-lsi-iscsi.args       |  14 +
 .../qemuxml2argv-hostdev-scsi-lsi-iscsi.xml        |  40 ++
 ...emuxml2argv-hostdev-scsi-virtio-iscsi-auth.args |  16 +
 ...qemuxml2argv-hostdev-scsi-virtio-iscsi-auth.xml |  46 ++
 .../qemuxml2argv-hostdev-scsi-virtio-iscsi.args    |  16 +
 .../qemuxml2argv-hostdev-scsi-virtio-iscsi.xml     |  40 ++
 tests/qemuxml2argvtest.c                           |  16 +
 tests/qemuxml2xmltest.c                            |   5 +
 33 files changed, 1317 insertions(+), 606 deletions(-)
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-lsi-iscsi-auth.args
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-lsi-iscsi-auth.xml
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-lsi-iscsi.args
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-lsi-iscsi.xml
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-virtio-iscsi-auth.args
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-virtio-iscsi-auth.xml
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-virtio-iscsi.args
 create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-hostdev-scsi-virtio-iscsi.xml

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1.9.3