Re: [Xen-devel] [PATCH v2 0/2] Support of RO MMCFG access for PVH/HVMlite dom0s

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 18/12/15 10:11, Jan Beulich wrote:
>>>> On 17.12.15 at 21:22, <boris.ostrovsky@xxxxxxxxxx> wrote:
>> * Left non-MMCFG RO accesses unhandled (we havent't encountered those 
>> accesses
>>   yet with PVH dom0 and it's probably better to fault on them and investigate
>>   whether they are guest's issues).
> I seriously question this being a good approach,

I concur.  All accesses should be terminated somehow, even if this is
the hypervisor dropping writes and completing reads with ~0's.

This is the expected behaviour from the x86 architecture.

~Andrew

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