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Re: [Xen-devel] Why does xc_map_foreign_range() refuse to map pfns below 1M from a domU
On Wed, 2013-12-04 at 12:14 +0000, Jan Beulich wrote:
> >>> On 04.12.13 at 13:01, Tomasz Wroblewski <tomasz.wroblewski@xxxxxxxxxx>
> >>> wrote:
> > On 12/04/2013 12:36 PM, Jan Beulich wrote:
> >> But that's a fundamental thing to explain. As Ian says - foreign PFNs
> >> shouldn't make it here, or else how do you know how to translate
> >> them to MFNs (as you can't consult the local P2M table to do so)?
> >>
> > I was under the impression that the translation is done inside in xen
> > inside
> > HYPERVISOR_mmu_update,
>
> That hypercall does translation only for auto-translated guests,
> which a normal PV one clearly isn't.
When mapping a foreign owned page it is the remote owners mode which
matters though, isn't it?
Ian.
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