[RFC PATCH v1] powerpc/prom_init: disable XIVE in Secure VM.

[Cédric Le Goater]

[ ... ] 

>> yes because you also need to share the XIVE TIMA and ESB pages mapped 
>> in xive_native_esb_fault() and xive_native_tima_fault(). 
> 
> These pages belong to the xive memory slot right? If that is the case,
> they are implicitly shared. The Ultravisor will set them up to be
> shared. The guest kernel should not be doing anything.
> 
> We still need some fixes in KVM and Ultravisor to correctly map the
> hardware pages to GPA ranges of the xive memory slot. Work is in progress...

ok. Since this is already done for KVM, I suppose it's not too hard. 
the VMA has VM_IO | VM_PFNMAP flags.

Otherwise you could still pick up the XIVE ESB and TIMA HW MMIO ranges 
in OPAL and brutally declare the whole as shared, if that's possible.

C.