Re: all class init functions for all types in QEMU are called in select_machine(). Expected?

[Paolo Bonzini]

On 12/03/21 10:58, Claudio Fontana wrote:
> Not really, but I have been using the accel class init function on x86 to 
> register the TCG OPS,
>
> and this instead requires a bit more thought for ARM,
>
> because we currently register for the ARM M Profile the TCG Ops at 
> arm_v7m_class_init time,
> which is called already at select_machine() time,
>
> so when we select the accelerator, and we call the tcg_cpu_class_init, we run 
> the risk of overriding the existing tcg_ops
>
> Ideas? Looks horrible?

Not horrible, but wrong.  The class_init function must be idempotent: 
classes have no side effect until they're instantiated (and even then, 
usually we delay that to later, e.g. realized for devices or complete 
for user-creatable objects).

Why can't you register ops in the machine init function for the accelerator?

Paolo