[PATCH V2 2/9] xentrace: Support for ARM platform

[Benjamin Sanda <ben.sanda@dornerworks.com>]

Modified xenmem_add_to_physmap_one() to provide support for xentrace
on the ARM platform. Checks for DOMID_XEN added via new function,
get_pg_owner, ported and commonized from x86 code base. This provides
correct calls to rcu_lock_domain() when DOMID_XEN is requested.

Signed-off-by: Benjamin Sanda <ben.sanda@dornerworks.com>

---
Changed since v1:

  * Moved get_pg_owner() from the arch specific mm.c source files into
    the common page_alloc.c source. This was done as get_pg_owner() is
    now needed by both architectures and is essentially identical in
    both.
  * Moved put_pg_owner from the arch specific mm.c source files into
    the common page_alloc.c source to make available to all platforms.
  * Removed DOMID_XEN check from page_to_mfn(page) call in
    xenmem_add_to_physmap_one() per review comment (check considered
    to be in excess of need).
  * Removed forward declare of get_pg_owner from mm.c (arm) as it is
    now in the mm.h common header.
---
 xen/arch/arm/mm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 81f9e2e..19d6c2c 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1099,7 +1099,8 @@ int xenmem_add_to_physmap_one(
     {
         struct domain *od;
         p2m_type_t p2mt;
-        od = rcu_lock_domain_by_any_id(foreign_domid);
+        od = get_pg_owner(foreign_domid);
+
         if ( od == NULL )
             return -ESRCH;
 
-- 
2.5.0


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