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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

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.

~Andrew

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