linux-kernel - Re: [Xen-devel] [PATCH 4/5] xen: arm: implement remap interfaces needed for privcmd mappings.

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Date:	Wed, 24 Oct 2012 17:07:46 -0700
From:	Mukesh Rathor <mukesh.rathor@...cle.com>
To:	Mukesh Rathor <mukesh.rathor@...cle.com>
Cc:	Ian Campbell <ian.campbell@...rix.com>,
	xen-devel <xen-devel@...ts.xen.org>,
	Stefano Stabellini <stefano.stabellini@...rix.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [Xen-devel] [PATCH 4/5] xen: arm: implement remap interfaces
 needed for privcmd mappings.

On Wed, 24 Oct 2012 16:44:11 -0700
Mukesh Rathor <mukesh.rathor@...cle.com> wrote:

> >  
> >  #ifndef HYPERVISOR_VIRT_START
> > diff --git a/include/xen/interface/memory.h
> > b/include/xen/interface/memory.h index ad0dff5..5de2b36 100644
> > --- a/include/xen/interface/memory.h
> > +++ b/include/xen/interface/memory.h
> > @@ -188,6 +188,24 @@ DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
> >  /*** REMOVED ***/
> >  /*#define XENMEM_translate_gpfn_list  8*/
> >  
> > +#define XENMEM_add_to_physmap_range 23
> > +struct xen_add_to_physmap_range {
> > +    /* Which domain to change the mapping for. */
> > +    domid_t domid;
> > +    uint16_t space; /* => enum phys_map_space */
> > +
> > +    /* Number of pages to go through */
> > +    uint16_t size;
> > +    domid_t foreign_domid; /* IFF gmfn_foreign */
> > +
> > +    /* Indexes into space being mapped. */
> > +    GUEST_HANDLE(xen_ulong_t) idxs;
> > +
> > +    /* GPFN in domid where the source mapping page should appear.
> > */
> > +    GUEST_HANDLE(xen_pfn_t) gpfns;
> 
> 
> Looking at your arm implementation in xen, doesn't look like you are
> expecting idxs and gpfns to be contigous. In that case, shouldn't idxs
> and gpfns be pointers, ie, they are sent down as arrays? Or does
> GUEST_HANDLE do that, I can't seem to find where it's defined quickly.

Never mind, I see it got corrected to XEN_GUEST_HANDLE in staging tree.
Still doesn't compile tho:

public/memory.h:246: error: expected specifier-qualifier-list before
‘__guest_handle_xen_ulong_t’

I'll figure it out.

thanks,
Mukesh
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