[RFC qemu/qemu-server 0/2] qemu: dump and ship CPU model expansions

[Fiona Ebner <f.ebner@proxmox.com>]

Sending this, so Arthur and Erik can look into it for issue #7841.

Having the CPU model expansions readily available makes it possible to
be precise when checking for the presence of certain CPU flags or
properties. For example, the pdpe1gb flag is relevant since OVMF will
limit the phys-bits to 40 without that. Starting a QEMU process to
query this via QMP is too costly in many cases, so qemu-server is
currently limited to use heuristics.

Having the flags can also be useful for the custom CPU model editor to
show what the default value for a given flag and model actually is.

The one for x86_64 is rather large with 1.65 MiB, but it can be loaded
on first use and then cached by the CPUConfig.pm module.

It's important to be aware that some features/flags are gated behind
others, most prominently, the nested virtualization ones.

pve-qemu:

Fiona Ebner (1):
  d/rules: dump and ship CPU model expansions

 debian/cpu-model-expansions-aarch64.json |   220 +
 debian/cpu-model-expansions-x86_64.json  | 51268 +++++++++++++++++++++
 debian/dump-cpu-model-expansions.pl      |    66 +
 debian/rules                             |    10 +
 4 files changed, 51564 insertions(+)
 create mode 100644 debian/cpu-model-expansions-aarch64.json
 create mode 100644 debian/cpu-model-expansions-x86_64.json
 create mode 100755 debian/dump-cpu-model-expansions.pl


qemu-server:

Fiona Ebner (1):
  cpu flags: introduce get_cpu_model_expansions() helper

 src/PVE/QemuServer/CPUFlags.pm | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)


Summary over all repositories:
  5 files changed, 51591 insertions(+), 0 deletions(-)

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