Re: Adding new custom devices to Xen via QEMU

[David Vrabel <david.vrabel@citrix.com>]

On 30/09/16 14:35, Jason Dickens wrote:
> Hi Wei,
> 
> Thanks for the response. It make sense to me that if the device were on
> the PCI bus (or other such bus, e.g. USB) that it could be discovered,
> at least by an OS. Its something to consider. I should mention that our
> guest VM doesn't actually use an OS.
> 
> However, the device is not implemented that as PCI it is simply memory
> mapped. Technically, in QEMU is has type ISA because it was derived as a
> modification of the TPM device. Is it possible something is lacking in
> the QEMU model that Xen needs but KVM doesn't?
> If the answer is that Xen should not need modification for any new
> devices then this gives me hope.  You've also inspired some things to
> try, like whether or not smaller modifications to the TPM device work.
> One change that is significant to mention is that the physical address
> range use is anomalous, by which I mean it not in the normal device range.

Does device MMIO overlap with guest RAM?  If so, you'll need to
unpopulate the RAM first.

David

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