[Xen-devel] [PATCH for-4.12 v2 1/8] xen/page_alloc: Move get_pg_owner()/put_pg_owner() from x86 to common code

[Julien Grall <julien.grall@xxxxxxx>]

From: Benjamin Sanda <ben.sanda@xxxxxxxxxxxxxxx>

get_pg_owner() and put_pg_owner() will be necessary in a follow-up
commit to support xentrace on Arm. So move the helper to common code.

Signed-off-by: Benjamin Sanda <ben.sanda@xxxxxxxxxxxxxxx>
[julien: Rework commit title / turn put_pg_owner to a macro]
Signed-off-by: Julien Grall <julien.grall@xxxxxxx>

---
    Changes in v2:
        - Move get_pg_owner()/put_pg_owner() in sched.h
        - Turn put_pg_owner() to a static inline
---
 xen/arch/x86/mm.c       | 42 ------------------------------------------
 xen/common/page_alloc.c | 38 ++++++++++++++++++++++++++++++++++++++
 xen/include/xen/sched.h |  8 ++++++++
 3 files changed, 46 insertions(+), 42 deletions(-)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 1431f347f3..08f34722c2 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -3089,48 +3089,6 @@ static int vcpumask_to_pcpumask(
     }
 }
 
-static struct domain *get_pg_owner(domid_t domid)
-{
-    struct domain *pg_owner = NULL, *curr = current->domain;
-
-    if ( likely(domid == DOMID_SELF) )
-    {
-        pg_owner = rcu_lock_current_domain();
-        goto out;
-    }
-
-    if ( unlikely(domid == curr->domain_id) )
-    {
-        gdprintk(XENLOG_WARNING, "Cannot specify itself as foreign domain\n");
-        goto out;
-    }
-
-    switch ( domid )
-    {
-    case DOMID_IO:
-        pg_owner = rcu_lock_domain(dom_io);
-        break;
-    case DOMID_XEN:
-        pg_owner = rcu_lock_domain(dom_xen);
-        break;
-    default:
-        if ( (pg_owner = rcu_lock_domain_by_id(domid)) == NULL )
-        {
-            gdprintk(XENLOG_WARNING, "Unknown domain d%d\n", domid);
-            break;
-        }
-        break;
-    }
-
- out:
-    return pg_owner;
-}
-
-static void put_pg_owner(struct domain *pg_owner)
-{
-    rcu_unlock_domain(pg_owner);
-}
-
 long do_mmuext_op(
     XEN_GUEST_HANDLE_PARAM(mmuext_op_t) uops,
     unsigned int count,
diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 2c6509e3a0..edb93b8ada 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -146,6 +146,7 @@
 #include <asm/guest.h>
 #include <asm/p2m.h>
 #include <asm/setup.h> /* for highmem_start only */
+#include <asm/paging.h>
 #else
 #define p2m_pod_offline_or_broken_hit(pg) 0
 #define p2m_pod_offline_or_broken_replace(pg) BUG_ON(pg != NULL)
@@ -2509,6 +2510,43 @@ static __init int register_heap_trigger(void)
 }
 __initcall(register_heap_trigger);
 
+struct domain *get_pg_owner(domid_t domid)
+{
+    struct domain *pg_owner = NULL, *curr = current->domain;
+
+    if ( likely(domid == DOMID_SELF) )
+    {
+        pg_owner = rcu_lock_current_domain();
+        goto out;
+    }
+
+    if ( unlikely(domid == curr->domain_id) )
+    {
+        gdprintk(XENLOG_WARNING, "Cannot specify itself as foreign domain\n");
+        goto out;
+    }
+
+    switch ( domid )
+    {
+    case DOMID_IO:
+        pg_owner = rcu_lock_domain(dom_io);
+        break;
+    case DOMID_XEN:
+        pg_owner = rcu_lock_domain(dom_xen);
+        break;
+    default:
+        if ( (pg_owner = rcu_lock_domain_by_id(domid)) == NULL )
+        {
+            gdprintk(XENLOG_WARNING, "Unknown domain d%d\n", domid);
+            break;
+        }
+        break;
+    }
+
+ out:
+    return pg_owner;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 0309c1f2a0..4956a7716c 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -599,6 +599,14 @@ static inline struct domain *rcu_lock_current_domain(void)
 }
 
 struct domain *get_domain_by_id(domid_t dom);
+
+struct domain *get_pg_owner(domid_t domid);
+
+static inline void put_pg_owner(struct domain *pg_owner)
+{
+    rcu_unlock_domain(pg_owner);
+}
+
 void domain_destroy(struct domain *d);
 int domain_kill(struct domain *d);
 int domain_shutdown(struct domain *d, u8 reason);
-- 
2.11.0


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