…xplicitly default the field value if it is not set

Signed-off-by: Misha Sakhnov <[email protected]>

…nd mark vmSpec.Guest.CPUs.Min as online during the boot

Signed-off-by: Misha Sakhnov <[email protected]>

Signed-off-by: Misha Sakhnov <[email protected]>

introduce separate CPU scaling flow based on the vmSpec.cpuScalingMode

If vmSpec.cpuScalingMode is equal to `qmp_scaling` the logic of the
scaling is preserved as before:

- Scale, if required the amount of CPUs using qmp commands.
- If it is required to scale cgroups, call vm-runner /cpu_change endpoint

if vmSpec.cpuScalingMode is equal to `cpuSysfsStateScaling` all cpu
scaling requests go directly to the vm-runner /cpu_change, which in
that configuration goes to the neonvm-daemon to reconcile required
amount of online CPUs.

Value `cpuSysfsStateScaling` also modifies the qemu and the kernel
arguments to enable plug all CPUs but mark as online only first one.

Signed-off-by: Misha Sakhnov <[email protected]>

pass cpuScalingMode as argument to the vm-runner
rename arguments, constants and functions here and there
drop unused code
move default cpu scaling mode to controller argument

Signed-off-by: Misha Sakhnov <[email protected]>

Co-authored-by: Oleg Vasilev <[email protected]>

Signed-off-by: Misha Sakhnov <[email protected]>

Signed-off-by: Misha Sakhnov <[email protected]>

Co-authored-by: Oleg Vasilev <[email protected]>

Signed-off-by: Misha Sakhnov <[email protected]>

change CpuScalingMode to be a enum type
drop obsolete comments

Signed-off-by: Misha Sakhnov <[email protected]>

Improve readability in pkg/neonvm/controllers/vm_controller_cpu_scaling.go
by adding empty lines and comments

Signed-off-by: Misha Sakhnov <[email protected]>

Change scaling logic to work with ranges instead of slices
Split sys fs scaling struture to allow unit testing
Add unit tests for the main reconcilation logic

Signed-off-by: Misha Sakhnov <[email protected]>

Get current state through aggregated /cpu/online file
instead of using per-cpu files

Signed-off-by: Misha Sakhnov <[email protected]>

Co-authored-by: Em Sharnoff <[email protected]>
Signed-off-by: Misha Sakhnov <[email protected]>

Change cpuscaling logic to work with collection of IDs

Signed-off-by: Misha Sakhnov <[email protected]>

Co-authored-by: Oleg Vasilev <[email protected]>