Re: [Xen-ia64-devel][PATCH][VTD] small patches for VTD

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On Thu, Oct 23, 2008 at 10:31:20AM +0800, Xu, Anthony wrote:
> Iommu_un/map_page does nothing for PV domain.
> Why is there a race?

Oh sorry. I'm not very familiar with iommu code (yet).
My understanding is
  iommu_domain_init() is called unconditionaly by arch_domain_create()
  so that platform_ops is initialized.
  iommu_(un)map_page() checks iommu_enabled and whether platform_ops is
  initialized. Thus iommu_(un)map_page() manipulates iommu page table
  even for PV domain.

Clearly I'm missing something important. Could you enlighten me?

thanks,
-- 
yamahata

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