Re: [PATCH v2] port/xen: map memory directly in privcmd PRIVCMD_MMAPBATCH

[Cherry G. Mathew <cherry%zyx.in@localhost>]

>>>>> "Roger" == Roger Pau Monne <roger.pau%citrix.com@localhost> writes:

    Roger> Cherry G.Mathew wrote:
    >>>>>>> "Roger" == Roger Pau Monne<roger.pau%citrix.com@localhost> writes:
    >> 
    Roger> Cherry G.Mathew wrote:
    >> >>>>>>> "Roger" == Roger Pau Monne<roger.pau%citrix.com@localhost> 
writes:
    >> >> I'm still missing something here, but I think something is not
    >> >> right here. I *think* qemu or NetBSD is mixing up the guest's
    >> >> gmfns (pfns) and dom0 mfns here.
    >> >>
    >> >> - qemu queries the hypervisor for the guest pfn (aka gmfn)
    >> via: >> [1] xc_get_hvm_param(xen_xc, xen_domid, >>
    >> HVM_PARAM_IOREQ_PFN,&ioreq_pfn);
    >> 
    Roger> With this call we get a set of gfns of the guest.
    >> 
    >> what are "gfns" ? Are they mfns (ie; the fns go into the page
    >> tables) or gmfns (what the guest *thinks* goes into page tables)
    >> ?

    Roger> They are gmfns.

Ok, that makes a *lot* of sense now :-)

But it doesn't answer my question of how pmap_kenter_ma() works, since
it's entering a mfn into the pmap VA. Where does this gmfn->mfn (or
P->M) translation take place ?

-- 
Cherry