Re: [Xen-devel] passthrough

[Andrii Anisov <andrii_anisov@xxxxxxxx>]

Dear John,


I would speak about XEN on ARM further.

Basically you need a passthrough in XEN terms in case you want a bus 
initiator (i.e. DMA capable) device to be assigned to DomU.
For a passive device it's pretty enough to assign MMIO ranges and 
interrupts using guest domain config. The pitfall here is that a device 
tree generated for guest domain by xen tools will not have any assigned 
device specific nodes.
But a setup with earlyprintk from one guest into the second console of a 
Salvator-X board is pretty straightforward. Something more complex will 
require additional hacks.

On 23.05.17 15:53, George John wrote:
> Thanks for the reply. we are using renesas rcar h3 board. Does it 
> supports?
XEN passthrough functionality relies on IOMMU. The R-Car Gen3 SoCs have 
a custom IOMMU named IPMMU. XEN does not support IPMMU yet.
--

*Andrii Anisov*



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