RE: [Xen-devel] [PATCH 4/5] VT-d support for PV guests

[Espen Skoglund <espen.skoglund@xxxxxxxxxxxxx>]

[Allen M Kay]
> -    if ( iommu_enabled && is_hvm_domain(d) )
> +    if ( iommu_enabled && (is_hvm_domain(d) || need_iommu(d)) )

> I thought PV guests don't have p2m page table.  Why do you need to
> modify set_p2m_entry() for VT-d PV guest support?

If only HVM guests have a p2m page table then why was the
is_hvm_domain() check there is the first place?  Can't you also have
PV guests with shadow page tables, and don't such guests also use p2m?

I haven't looked into shadow PT support, so I would really like to
have an answer on this one.

        eSk



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