[pve-devel] [PATCH v9 0/6] Add basics for custom CPU models

[Stefan Reiter]

Based on the RFC and following on- and off-list discussion about custom CPU
models [0].

In essence, this revised patch allows a user to specify custom CPU models in
/etc/pve/cpu-models.conf (section-config style [1]), where VMs using that CPU
model inherit details from the definition. This removes any fragile
"auto-magical" CPU flag detection, while still giving the user a way to create
VMs with the best possible subset of CPU features maintaining live-migration
compatibility.

Includes the infrastructure for broadcasting supported CPU flags for each
cluster-node via the key-value store - this is not necessary for the
custom-cpu feature in particular, but I think could prove useful for
implementing the GUI part (e.g. show the user which flags are supported on which
nodes).

v8 -> v9:
* rebase remaining patches on master

v7 -> v8:
* rebase on master, fix tests now using +pve0
* fixed nits noted by Thomas
* moved live-migration/snapshot patches forward to avoid temporary breakage
* fix CPU hotplug with custom CPUs
* guard mkdir with check_cfs_is_mounted and also run before write
* fix rebase-error in cfg2cmd tests (getaddrinfo_all)
* dropped applied patches


< see [2] for older history >


[0]: https://pve.proxmox.com/pipermail/pve-devel/2019-July/038268.html
[1]: e.g.:
cpu-model: custom-cpu-name
    host-phys-bits 1
    flags +aes;+avx;+avx2
    reported-model kvm64
[2] https://pve.proxmox.com/pipermail/pve-devel/2020-January/041278.html


qemu-server: Stefan Reiter (6):
  Include "-cpu" parameter with live-migration
  Include "-cpu" parameter with snapshots/suspend
  Add helpers to better structure CPU option handling
  Rework get_cpu_options and allow custom CPU models
  fix #2318: allow phys-bits and host-phys-bits CPU settings
  cfg2cmd: add test cases for custom CPU models

 PVE/API2/Qemu.pm                              |   9 +-
 PVE/QemuConfig.pm                             |  34 ++-
 PVE/QemuMigrate.pm                            |  21 ++
 PVE/QemuServer.pm                             |  41 ++-
 PVE/QemuServer/CPUConfig.pm                   | 281 ++++++++++++++----
 test/cfg2cmd/custom-cpu-model-defaults.conf   |   8 +
 .../custom-cpu-model-defaults.conf.cmd        |  24 ++
 test/cfg2cmd/custom-cpu-model.conf            |   8 +
 test/cfg2cmd/custom-cpu-model.conf.cmd        |  27 ++
 test/cfg2cmd/i440fx-win10-hostpci.conf.cmd    |   2 +-
 test/cfg2cmd/minimal-defaults.conf.cmd        |   2 +-
 test/cfg2cmd/pinned-version.conf.cmd          |   2 +-
 .../q35-linux-hostpci-multifunction.conf.cmd  |   2 +-
 test/cfg2cmd/q35-linux-hostpci.conf.cmd       |   2 +-
 test/cfg2cmd/q35-win10-hostpci.conf.cmd       |   2 +-
 test/cfg2cmd/simple1.conf.cmd                 |   2 +-
 test/cfg2cmd/spice-enhancments.conf.cmd       |   2 +-
 test/cfg2cmd/spice-linux-4.1.conf.cmd         |   2 +-
 test/cfg2cmd/spice-usb3.conf.cmd              |   2 +-
 test/cfg2cmd/spice-win.conf.cmd               |   2 +-
 test/run_config2command_tests.pl              |  23 ++
 21 files changed, 416 insertions(+), 82 deletions(-)
 create mode 100644 test/cfg2cmd/custom-cpu-model-defaults.conf
 create mode 100644 test/cfg2cmd/custom-cpu-model-defaults.conf.cmd
 create mode 100644 test/cfg2cmd/custom-cpu-model.conf
 create mode 100644 test/cfg2cmd/custom-cpu-model.conf.cmd

-- 
2.26.0