Re: [Xen-devel] question about ept_set_entry

["Zhang, Chunyu" <zhangcy@xxxxxxxxxxxxxx>]

hi jan
>>>> On 29.04.16 at 11:14, <zhangcy@xxxxxxxxxxxxxx> wrote:
>> hi all
>> 
>> in
>> - p2m-ept.c
>>   - ept_set_entry
>> 
>> i see code about iommu,
>> those code  for what?
>
>For keeping the IOMMU translation tables in sync with the CPU ones?
got it, thanks.
i will check IOMMU translation.
>But perhaps I'm simply not understanding what you try to get at...
i only want to know the  purpose of those code.
>
>Jan
>
>> -----
>> 
>>     if ( rc == 0 && p2m_is_hostp2m(p2m) && need_iommu(d) &&
>>          need_modify_vtd_table )
>>     {
>>         if ( iommu_hap_pt_share )
>>             iommu_pte_flush(d, gfn, &ept_entry->epte, order, 
>> vtd_pte_present);
>>         else
>>         {
>>             if ( iommu_flags )
>>                 for ( i = 0; i < (1 << order); i++ )
>>                     iommu_map_page(d, gfn + i, mfn_x(mfn) + i, iommu_flags);
>>             else
>>                 for ( i = 0; i < (1 << order); i++ )
>>                     iommu_unmap_page(d, gfn + i);
>>         }
>>     }
>> 
>> 
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>> --------------
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>
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>
>

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