Re: [Xen-devel] Why does xc_map_foreign_range() refuse to map pfns below 1M from a domU

[Mihai DonÈu <mihai.dontu@xxxxxxxxx>]

On Wed, 4 Dec 2013 15:19:54 +0100 Tomasz Wroblewski wrote:
> > Razvan and I are working together to find a solution to this. I took
> > your patch for a spin and while that code path is taken when
> > invoking xc_map_foreign_range(), the call still fails with EINVAL.
> > I haven't yet determined if the call stops in the domU kernel or it
> > reaches xen and gets terminated there. I've tried this on Ubuntu's
> > 3.8. on top of XenServer's xen-4.3.1.
> >
> 
> Not sure why the patch doesn't work for you (you applied it to domU
> kernel which ties to map, right?), but before we applied this, the
> EINVAL was coming from hypervisor's HYPERVISOR_mmu_update in
> xen_remap_domain_mfn_range(), since the PTE constructed by
> xen_make_pte was invalid for the other domain.
> > Thanks,
> >
> 

I'm sorry, I take back what I said before. The patch works OK, I just
interpreted the results wrong (some pages really _are_ unaccessible,
even from dom0). Thank you for all your help. :-)

-- 
Mihai DonÈu

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