From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH v1 1/8]: PVH  basic and hader file changes
Date: Wed, 26 Sep 2012 10:33:17 -0400
Message-ID: <20120926143317.GA24866@phenom.dumpdata.com>
References: <20120921121511.30001c08@mantra.us.oracle.com>
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To: Mukesh Rathor <mukesh.rathor@oracle.com>
Cc: "Xen-devel@lists.xensource.com" <Xen-devel@lists.xensource.com>, Ian Campbell <Ian.Campbell@citrix.com>, "stefano.stabellini@eu.citrix.com" <stefano.stabellini@eu.citrix.com>
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> diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
> index eac3ce1..f150fa1c 100644
> --- a/include/xen/interface/memory.h
> +++ b/include/xen/interface/memory.h
> @@ -163,11 +163,22 @@ struct xen_add_to_physmap {
>      /* Which domain to change the mapping for. */
>      domid_t domid;
>  
> +    union {
> +        /* Number of pages to go through for gmfn_range */
> +        uint16_t    size;
> +	/* IFF XENMAPSPACE_gmfn_foreign */
> +        domid_t foreign_domid;
> +    } u;
>      /* Source mapping space. */

So found out why it crashed on PVHVM. If you rebase your patch
on top of  b58aaa4b0b3506c094308342d746f600468c63d9

Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Date:   Mon Aug 6 15:27:24 2012 +0100

    xen: update xen_add_to_physmap interface
    
    Update struct xen_add_to_physmap to be in sync with Xen's version of the
    structure.
    The size field was introduced by:
    
    changeset:   24164:707d27fe03e7
    user:        Jean Guyader <jean.guyader@eu.citrix.com>
    date:        Fri Nov 18 13:42:08 2011 +0000
    summary:     mm: New XENMEM space, XENMAPSPACE_gmfn_range
    
    According to the comment:
    
    "This new field .size is located in the 16 bits padding between .domid
    and .space in struct xen_add_to_physmap to stay compatible with older
    versions."
    
    Changes in v2:
    
    - remove erroneous comment in the commit message.
    
    Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

the merge ends up looking like this:
@ -166,11 +166,22 @@ struct xen_add_to_physmap {
     /* 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 XENMAPSPACE_gmfn_foreign */
+        domid_t foreign_domid;
+    } u;

Grrrr..