Re: [Xen-devel] [v6][PATCH 0/7] xen: reserve RMRR to avoid conflicting MMIO/RAM

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.09.14 at 03:38, <tiejun.chen@xxxxxxxxx> wrote:
> On 2014/9/11 5:44, Tian, Kevin wrote:
>>> From: Chen, Tiejun
>>> Sent: Tuesday, September 09, 2014 10:50 PM
>>>
>>
>> currently the confliction is detected absolutely. Do we need a way to allow
>> the confliction if there is no device assigned at all?
> 
> How to handle a hot-plug case when guest already boot? I think it may 
> not be worth distinguishing such fine gain, things will be becoming 
> complicated.

In that case hotplug should fail. I'm very much in agreement with
Kevin that an override should be possible if there's any risk of the
detection done now could cause problems on certain systems (as
pointed out before, I'm mainly concerned about RMRRs being
defined in regions that overlap where the guest's BIOS wants to
be placed).

Jan


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