Re: [Xen-devel] [PATCH for 4.6] VT-d: Create IOMMU mappings for RMRR regions if shared EPT is not being used

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.08.15 at 11:05, <tiejun.chen@xxxxxxxxx> wrote:
> On 8/27/2015 4:40 PM, Malcolm Crossley wrote:
>> On 27/08/15 03:59, Chen, Tiejun wrote:
>>> This kind of issue is already gone.
>>>
>>> https://www.mail-archive.com/xen-devel@xxxxxxxxxxxxx/msg32464.html 
>>
>> There is a bug in the code you refer to above which results in no IOMMU page 
> table
>> mappings being created if the guest domain is not sharing it's EPT page 
> tables with
>> the IOMMU.
>>
>> set_identity_p2m_entry only configures the EPT page tables and does not 
> configure
>> the IOMMU page tables.
> 
> Okay, I got what you mean.
> 
> Instead, could you insert iommu_{map,unmap_page() into 
> {set,clear}_identity_p2m_entry()? I think this can make 
> {set,clear}_identity_p2m_entry approachable in all circumstances.
> 
> Kevin and Jan,
> 
> Is this fine?

This matches what I've also just suggested in another reply.

Jan


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