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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 18.12.15 at 14:53, <boris.ostrovsky@xxxxxxxxxx> wrote:
> On 12/18/2015 08:02 AM, Andrew Cooper wrote:
>> 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.
> 
> OK, I'll add that in.
> 
> To answer Jan's question, I did try 'vga=keep' and that worked fine.

Interesting. Does your system not load/use a DRM driver for the
card? Or is the driver so minimalistic that no extended config
space write ever occurs?

Jan


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