Re: [PATCH 0/3] Enable asynchronous teardown on s390x hosts

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On 6/21/23 6:54 PM, Jonathon Jongsma wrote:
On 6/13/23 10:42 AM, Boris Fiuczynski wrote:
Update capabilities for QEMU 8.1 on s390x, add a new capability
async-teardown and make use of it when running on s390x hosts to improve
memory reclaiming.

Is this really something that should be enabled unconditionally on all s390x guests, or should it be configured with some domain xml? If there's ever a case where an s390x domain would want this disabled, I think it would have to be configurable. Also, if there is any situation where a domain on a different architecture might want to enable this, that would also require some kind of configurability. At minimum it seems to me that the commit log should have a lot more justification for why this approach is justified.

Jonathon

Jonathon,
thanks for your feedback.

I am unsure where to located such a configuration option in the gust domain XML.

A few thoughts:
1) introduce a new emulator-options element in devices and a run-with child element with a parameter async-teardown, e.g.
...
<devices>
  <emulator>/usr/lib/bin/qemu</emulator>
  <emulator-options>
    <run-with async-teardown='on'/>
  </emulator-options>
</devices>
...

2) introduce a new run-with element with a parameter async-teardown in domain, e.g.

<domain>
  ...
  <run-with async-teardown='on'/>
  ...
</domain>

Any ideas and suggestions are welcome.



Boris Fiuczynski (2):
   qemu: add run-with async-teardown capability
   qemu: enable asynchronous teardown on s390x hosts

Shalini Chellathurai Saroja (1):
   tests: add capabilities for QEMU 8.1.0 on s390x

  src/qemu/qemu_capabilities.c                  |     2 +
  src/qemu/qemu_capabilities.h                  |     1 +
  src/qemu/qemu_command.c                       |    15 +
  tests/domaincapsdata/qemu_8.1.0.s390x.xml     |   284 +
  .../caps_8.1.0_s390x.replies                  | 34594 ++++++++++++++++
  .../qemucapabilitiesdata/caps_8.1.0_s390x.xml |  3719 ++
  .../caps_8.1.0_x86_64.xml                     |     1 +
  .../qemuhotplug-base-ccw-live+ccw-virtio.xml  |     1 -
  ...ith-2-ccw-virtio+ccw-virtio-1-explicit.xml |     1 -
  ...with-2-ccw-virtio+ccw-virtio-1-reverse.xml |     1 -
  ...otplug-base-ccw-live-with-2-ccw-virtio.xml |     1 -
  ...-with-ccw-virtio+ccw-virtio-2-explicit.xml |     1 -
  ...-ccw-live-with-ccw-virtio+ccw-virtio-2.xml |     1 -
  ...uhotplug-base-ccw-live-with-ccw-virtio.xml |     1 -
  .../qemuhotplug-base-ccw-live.xml             |     1 -
  .../balloon-ccw-deflate.s390x-latest.args     |     3 +-
  .../console-sclp.s390x-latest.args            |     7 +-
  .../console-virtio-ccw.s390x-latest.args      |     9 +-
  .../cpu-s390-features.s390x-latest.args       |     1 +
  .../cpu-s390-zEC12.s390x-latest.args          |     1 +
  ...default-video-type-s390x.s390x-latest.args |     5 +-
  .../disk-error-policy-s390x.s390x-latest.args |     7 +-
  .../disk-virtio-ccw-many.s390x-latest.args    |    11 +-
  .../disk-virtio-ccw.s390x-latest.args         |     7 +-
  .../disk-virtio-s390-zpci.s390x-latest.args   |     7 +-
  .../fs9p-ccw.s390x-latest.args                |    11 +-
  ...tdev-scsi-vhost-scsi-ccw.s390x-latest.args |     9 +-
  ...tdev-subsys-mdev-vfio-ap.s390x-latest.args |     5 +-
  ...ubsys-mdev-vfio-ccw-boot.s390x-latest.args |     5 +-
  ...dev-subsys-mdev-vfio-ccw.s390x-latest.args |     5 +-
  ...o-zpci-autogenerate-fids.s390x-latest.args |    11 +-
  ...o-zpci-autogenerate-uids.s390x-latest.args |    11 +-
  ...v-vfio-zpci-autogenerate.s390x-latest.args |     7 +-
  ...dev-vfio-zpci-boundaries.s390x-latest.args |    15 +-
  ...vfio-zpci-ccw-memballoon.s390x-latest.args |     9 +-
  ...io-zpci-multidomain-many.s390x-latest.args |    35 +-
  .../hostdev-vfio-zpci.s390x-latest.args       |     7 +-
  .../input-virtio-ccw.s390x-latest.args        |    11 +-
  ...othreads-virtio-scsi-ccw.s390x-latest.args |     9 +-
  .../launch-security-s390-pv.s390x-latest.args |     7 +-
  ...chine-aeskeywrap-off-cap.s390x-latest.args |     3 +-
  ...hine-aeskeywrap-off-caps.s390x-latest.args |     3 +-
  ...achine-aeskeywrap-on-cap.s390x-latest.args |     3 +-
  ...chine-aeskeywrap-on-caps.s390x-latest.args |     3 +-
  ...chine-deakeywrap-off-cap.s390x-latest.args |     3 +-
  ...hine-deakeywrap-off-caps.s390x-latest.args |     3 +-
  ...achine-deakeywrap-on-cap.s390x-latest.args |     3 +-
  ...chine-deakeywrap-on-caps.s390x-latest.args |     3 +-
  ...achine-keywrap-none-caps.s390x-latest.args |     3 +-
  .../machine-keywrap-none.s390x-latest.args    |     3 +-
  ...machine-loadparm-hostdev.s390x-latest.args |     5 +-
  ...multiple-disks-nets-s390.s390x-latest.args |    15 +-
  ...achine-loadparm-net-s390.s390x-latest.args |     7 +-
  .../machine-loadparm-s390.s390x-latest.args   |     5 +-
  .../net-virtio-ccw.s390x-latest.args          |    11 +-
  .../no-async-teardown-s390x.s390x-6.0.0.args  |    32 +
  .../no-async-teardown-s390x.xml               |    18 +
  ...low-bogus-usb-controller.s390x-latest.args |    11 +-
  ...390-allow-bogus-usb-none.s390x-latest.args |    11 +-
  ...t-cpu-kvm-ccw-virtio-2.7.s390x-latest.args |     3 +-
  ...t-cpu-kvm-ccw-virtio-4.2.s390x-latest.args |     5 +-
  ...t-cpu-tcg-ccw-virtio-2.7.s390x-latest.args |     3 +-
  ...t-cpu-tcg-ccw-virtio-4.2.s390x-latest.args |     3 +-
  .../s390-panic-missing.s390x-latest.args      |     7 +-
  .../s390-panic-no-address.s390x-latest.args   |     7 +-
  .../s390-serial-2.s390x-latest.args           |     5 +-
  .../s390-serial-console.s390x-latest.args     |     3 +-
  .../s390-serial.s390x-latest.args             |     3 +-
  .../s390x-ccw-graphics.s390x-latest.args      |    23 +-
  .../s390x-ccw-headless.s390x-latest.args      |    17 +-
  .../vhost-vsock-ccw-auto.s390x-latest.args    |     7 +-
  .../vhost-vsock-ccw-iommu.s390x-latest.args   |     7 +-
  .../vhost-vsock-ccw.s390x-latest.args         |     7 +-
  .../video-virtio-gpu-ccw.s390x-latest.args    |     9 +-
  .../virtio-rng-ccw.s390x-latest.args          |    11 +-
  .../watchdog-diag288.s390x-latest.args        |     7 +-
  tests/qemuxml2argvtest.c                      |     2 +
  77 files changed, 38916 insertions(+), 197 deletions(-)
  create mode 100644 tests/domaincapsdata/qemu_8.1.0.s390x.xml
  create mode 100644 tests/qemucapabilitiesdata/caps_8.1.0_s390x.replies
  create mode 100644 tests/qemucapabilitiesdata/caps_8.1.0_s390x.xml
  create mode 100644 tests/qemuxml2argvdata/no-async-teardown-s390x.s390x-6.0.0.args
  create mode 100644 tests/qemuxml2argvdata/no-async-teardown-s390x.xml




--
Mit freundlichen Grüßen/Kind regards
   Boris Fiuczynski

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