Re: [Xen-devel] [v6][PATCH 2/2] xen:vtd: missing RMRR mapping while share EPT

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

Jan Beulich wrote on 2014-09-24:
>>>> On 24.09.14 at 10:53, <tiejun.chen@xxxxxxxxx> wrote:
>> On 2014/9/24 16:47, Jan Beulich wrote:
>>>>>> On 24.09.14 at 10:35, <tiejun.chen@xxxxxxxxx> wrote:
>>>> In tools stack, how can we get ultimate e820 table built by hvmloader?
>>> 
>>> What is this needed for?
>> 
>> I mean in case of a hotplug after the migration, we should check any
>> overlap with current existing RAM/MMIO, right? So we need to know
>> current existing guest RAM/MMIO layout since this ultimate e820
>> table is just built by hvmloader, not in xen internal.
> 
> Actually I think we'd be better off not complicating the tool stack
> for this - with proper checking for collisions in the P2M updates, the
> assignment ought to fail without the tool stack doing anything.

How do the checking in P2M updates? Only hvmloader knows whether the RMRR 
region is reserved. If we want do the check in hypervisor, we need to report 
those info to hypervisor. 

> 
> Jan


Best regards,
Yang



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