Re: [Xen-devel] [v3][PATCH 1/1] xen:vtd: missing RMRR mapping while share EPT

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

Jan Beulich wrote on 2014-07-25:
>>>> On 25.07.14 at 02:56, <yang.z.zhang@xxxxxxxxx> wrote:
>> Jan Beulich wrote on 2014-07-24:
>>>>>> On 24.07.14 at 13:35, <tim@xxxxxxx> wrote:
>>>> (BTW, I think this patch can go in as-is, and the address-space
>>>> clash be fixed up separately.)
>>> 
>>> Not sure - I agree it shouldn't make things worse except when there
>>> is an RMRR but the device doesn't actually access it (i.e. would be
>>> fine without this patch). But I'm not sure committing half
>>> solutions is really appropriate for not really pressing issues.
>> 
>> I think we are talking two issues. The address-apace clash has
>> nothing to do with the issue this patch tries to fix. We will work
>> out another patch to fix it as Tim suggested.
> 
> No, we aren't: This patch _introduces_ the address space clash.

In non-sharept case, do we reserve the RMRR in e820 table? If not, the guest 
may use it as DMA buffer and it actually the same problem we are talking here. 

> 
> Jan


Best regards,
Yang



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