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

  • To: xen-users@xxxxxxxxxxxxxxxxxxxx
  • From: Kris Chaplin <kris.chaplin@xxxxxxxxxxxxxxx>
  • Date: Thu, 21 Jan 2021 11:34:26 +0000
  • Delivery-date: Thu, 21 Jan 2021 11:35:26 +0000
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  • List-id: Xen user discussion <xen-users.lists.xenproject.org>

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:

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 

Hope that can help you start even though it does not fully do exactly the stuff 
you want.


Brilliant - thank you.  I'll look into this.  Appreciate the pointers.





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