Re: [Xen-devel] question about ept_set_entry

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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?
But perhaps I'm simply not understanding what you try to get at...

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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