Re: [Xen-devel] [PATCH 1/5] xen: improve changes to xen_add_to_physmap

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Sat, 11 Aug 2012, Mukesh Rathor wrote:
> On Mon, 6 Aug 2012 15:12:01 +0100
> Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> 
> > This is an incremental patch on top of
> > c0bc926083b5987a3e9944eec2c12ad0580100e2: in order to retain binary
> > compatibility, it is better to introduce foreign_domid as part of a
> > union containing both size and foreign_domid.
> > 
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> > ---
> >  xen/include/public/memory.h |   11 +++++++----
> >  1 files changed, 7 insertions(+), 4 deletions(-)
> > 
> > diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h
> > index b2adfbe..b0af2fd 100644
> > --- a/xen/include/public/memory.h
> > +++ b/xen/include/public/memory.h
> > @@ -208,8 +208,12 @@ struct xen_add_to_physmap {
> >      /* Which domain to change the mapping for. */
> >      domid_t domid;
> >  
> > -    /* Number of pages to go through for gmfn_range */
> > -    uint16_t    size;
> > +    union {
> > +        /* Number of pages to go through for gmfn_range */
> > +        uint16_t    size;
> > +        /* IFF gmfn_foreign */
> > +        domid_t foreign_domid;
> > +    };
> >  
> >      /* Source mapping space. */
> >  #define XENMAPSPACE_shared_info  0 /* shared info page */
> > @@ -217,8 +221,7 @@ struct xen_add_to_physmap {
> >  #define XENMAPSPACE_gmfn         2 /* GMFN */
> >  #define XENMAPSPACE_gmfn_range   3 /* GMFN range */
> >  #define XENMAPSPACE_gmfn_foreign 4 /* GMFN from another guest */
> > -    uint16_t space;
> > -    domid_t foreign_domid; /* IFF gmfn_foreign */
> > +    unsigned int space;
> >  
> >  #define XENMAPIDX_grant_table_status 0x80000000
> >  
> 
> Is this the final version? I don't see it in today's xen unstable tree!
> I have this in my tree:
> 
> struct xen_add_to_physmap {
>     /* Which domain to change the mapping for. */
>     domid_t domid;
> 
>     /* Number of pages to go through for gmfn_range */
>     uint16_t    size;
> 
>     /* Source mapping space. */
> #define XENMAPSPACE_shared_info 0 /* shared info page */
> #define XENMAPSPACE_grant_table 1 /* grant table page */
> #define XENMAPSPACE_gmfn        2 /* GMFN */
> #define XENMAPSPACE_gmfn_range  3 /* GMFN range */
> #define XENMAPSPACE_gmfn_foreign 4 /* GMFN from another guest */
>     uint16_t space;
>     domid_t foreign_domid;         /* IFF XENMAPSPACE_gmfn_foreign */

We are still discussing how the final version should actually look like
but the last patch I sent is this one (for the for-4.3 tree):

http://marc.info/?l=xen-devel&m=134460098420461

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