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[libvirt] [PATCH v4 00/37] BaselineHypervisorCPU using QEMU QMP exchanges

Some architectures (S390) depend on QEMU to compute baseline CPU model and
expand a models feature set.

Interacting with QEMU requires starting the QEMU process and completing one or
more query-cpu-model-baseline QMP exchanges with QEMU in addition to a
query-cpu-model-expansion QMP exchange to expand all features in the model.

See "s390x CPU models: exposing features" patch set on Qemu-devel for discussion
of QEMU aspects.

This is part of resolution of: https://bugzilla.redhat.com/show_bug.cgi?id=1511999

Version 4 attempts to address all issues from V1,2,3 including making the
QEMU process activation for QMP Queries generic (not specific to capabilities)
and moving that code from qemu_capabilities to qemu_process.

Version 4 greatly expands the number of patches to make the set easier
to review.

The patches to do hypervisor baseline using QEMU are primarily in

The patches to make the process code generic (not capabilities specific)
are mostly in qemu_process.c

Many of the patches are cut / paste of existing code.  The patches that
change functionality are as modular and minimal as possible to make
reviewing easier.

I attempted to make the new qemu_process functions
consistent with the existing domain activation qemu_process functions.

A thread safe library function creates a unique directory under libDir for each QEMU
process (for QMP messaging) to decouple processes in terms of sockets and
file system footprint.

The last patch is based on past discussion of QEMU cpu
expansion only returning migratable features except for one x86 case where
non-migratable features are explicitly requested.  The patch records that features
are migratable based on QEMU only returning migratable features.  The main result
is the CPU xml for S390 CPU's contains the same migratability info the X86 currently
does.  The testcases were updated to reflect the change.

Every patch should compile independently if applied in sequence.


Chris Venteicher (37):
  qemu_monitor: Introduce qemuMonitorCPUModelInfoNew
  qemu_monitor: Introduce qemuMonitorCPUModelInfo / JSON conversion
  qemu_capabilities: Introduce virQEMuCapsMigratablePropsDiff
  qemu_monitor: qemuMonitorGetCPUModelExpansion inputs and outputs
  qemu_process: Move process code from qemu_capabilities to qemu_process
  qemu_process: Use qemuProcess prefix
  qemu_process: Limit qemuProcessNew to const input strings
  qemu_process: Refer to proc not cmd in process code
  qemu_process: Use consistent name for stop process function
  qemu_capabilities: Stop QEMU process before freeing
  qemu_process: Use qemuProcess struct for a single process
  qemu_process: Persist stderr in qemuProcess struct
  qemu_capabilities: Detect caps probe failure by checking monitor ptr
  qemu_process: Introduce qemuProcessStartQmp
  qemu_process: Add debug message in qemuProcessLaunchQmp
  qemu_process: Collect monitor code in single function
  qemu_process: Store libDir in qemuProcess struct
  qemu_process: Setup paths within qemuProcessInitQmp
  qemu_process: Stop retaining Qemu Monitor config in qemuProcess
  qemu_process: Don't open monitor if process failed
  qemu_process: Cleanup qemuProcess alloc function
  qemu_process: Cleanup qemuProcessStopQmp function
  qemu_process: Catch process free before process stop
  qemu_monitor: Make monitor callbacks optional
  qemu_process: Enter QMP command mode when starting QEMU Process
  qemu_process: Use unique directories for QMP processes
  qemu_process: Stop locking QMP process monitor immediately
  qemu_capabilities: Introduce CPUModelInfo to virCPUDef function
  qemu_capabilities: Introduce virCPUDef to CPUModelInfo function
  qemu_monitor: Support query-cpu-model-baseline QMP command
  qemu_driver: Consolidate code to baseline using libvirt
  qemu_driver: Decouple code for baseline using libvirt
  qemu_driver: Identify using libvirt as a distinct way to compute
  qemu_driver: Support baseline calculation using QEMU
  qemu_driver: Support feature expansion via QEMU when baselining cpu
  qemu_driver: Remove unsupported props in expanded hypervisor baseline
  qemu_monitor: Default props to migratable when expanding cpu model

 src/qemu/qemu_capabilities.c                  | 567 ++++++++----------
 src/qemu/qemu_capabilities.h                  |   4 +
 src/qemu/qemu_driver.c                        | 219 ++++++-
 src/qemu/qemu_monitor.c                       | 184 +++++-
 src/qemu/qemu_monitor.h                       |  29 +-
 src/qemu/qemu_monitor_json.c                  | 226 +++++--
 src/qemu/qemu_monitor_json.h                  |  12 +-
 src/qemu/qemu_process.c                       | 359 +++++++++++
 src/qemu/qemu_process.h                       |  37 ++
 tests/cputest.c                               |  11 +-
 .../caps_2.10.0.s390x.xml                     |  60 +-
 .../caps_2.11.0.s390x.xml                     |  58 +-
 .../caps_2.12.0.s390x.xml                     |  56 +-
 .../qemucapabilitiesdata/caps_2.8.0.s390x.xml |  32 +-
 .../qemucapabilitiesdata/caps_2.9.0.s390x.xml |  34 +-
 .../qemucapabilitiesdata/caps_3.0.0.s390x.xml |  64 +-
 tests/qemucapabilitiestest.c                  |   7 +
 17 files changed, 1388 insertions(+), 571 deletions(-)


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