Re: [Qemu-devel] [PATCH v8 2/5] Extract some reusable vGIC code

[Pavel Fedin]

 Hello!

> The need to add num_irq to this prototype reveals the ugliness
> of it as an interface.

> I don't think we gain much by making these two functions common,
> and we do get a lot of churn in the existing code below.

 You know, i was also thinking about it. And actually there is a way to resolve 
this: make some common structure holding num_irqs, num_cpus and dev_fd, and 
share it between GICv2 and GICv3 code. But wouldn't this be ugly too? So, i 
decided to make some compromise and leave it this way, at least for now.
 Regarding the latter two functions, i thought that they are useful for future 
live migration, aren't they? 

> It would be much nicer to convert the
> GIC to using named GPIO arrays for its incoming interrupt
> lines, so that you can handle the different cases of SPIs
> and PPIs naturally rather than exposing the awkward mapping
> from multiple different sets of interrupts into a single
> integer space.

 No no, not now. I believe this would require lots if changes in all machne 
models, i'm not ready for this...

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia