[Xen-devel] Re: [PATCH][VTD] fixing vt-d/ept page table sharing in xen-4.1

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 20.08.11 at 03:47, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> wrote:
> Tim/Keir,
> 
> Attached is a patch for fixing VT-d/EPT sharing issue in xen-4.1-testing.  It 
> is base on Tim's patch with the following changes:
> 
> 1) moving "d->arch.paging.mode = mode | PG_HAP_enable" before calling 
> p2m_alloc_table().  Otherwise, the call to iommu_use_hap_pt() in 
> iommu_set_pgd() will not return TRUE.

Wouldn't you need to revert this change in the error paths that sit
between the new and old places of where this happens/happened?

And is it certain that setting this earlier won't confuse other code?

Jan


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