Re: [Xen-devel] PCI-passthrough for 32 bit guests and high MMIO addresses

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.11.14 at 16:01, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 21/11/14 14:54, Jan Beulich wrote:
>>>>> On 21.11.14 at 15:39, <JGross@xxxxxxxx> wrote:
>>> Trying to do PCI-passthrough with a 32-bit pv-domain I passed the
>>> wrong device to the domain. The MMIO address was too large for a
>>> MFN of a 32-bit system (it was 380003200000-3800036fffff).
>>>
>>> Instead of rejecting the operation Xen tried to perform it resulting
>>> in a (quite understandable) failure in the domU.
>>>
>>> I think either the hypervisor or the tools should refuse to do
>>> PCI-passthrough in this case.
>> What's wrong with this large an address?
> 
> It is wider than 44 bits, so doesn't fit in a 32bit pfn for p2m/m2p
> update operations.

MMIO regions don't go into these tables.

Jan


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