Re: Armv8A - use of Xen and hypervisor EL2 translation tables to extend bridge address span

[Kris Chaplin <kris.chaplin@xxxxxxxxxxxxxxx>]

Hello Bertrand


> You will need to implement a driver in Xen to do that and catch some accesses 
> and play with mappings inside Xen.
> There is not something doing exactly that in Xen but you could look at what the 
> vPCI driver for Arm under development right now is doing:
> https://gitlab.com/xen-project/fusa/xen-integration/-/tree/integration/pci-passthrough
>
> In this the vpci is catching accesses from guest to the pci configuration space 
> and is emulating them.
>
> You might find some other examples of parts of Xen doing things like that in 
> other places (like the GIC driver emulating accesses to part of the interrupt 
> controller).
>
> Hope that can help you start even though it does not fully do exactly the stuff 
> you want.
>
> Cheers
> Bertrand
Brilliant - thank you.  I'll look into this.  Appreciate the pointers.


Regards

Kris