[PATCH 5/9] xen: introduce assign_pages_nr

[Penny Zheng]

Introduce new interface assign_pages_nr to deal with when page number is
not in a power-of-two, which will save the trouble each time user needs
to split the size in a power of 2 to use assign_pages.

Signed-off-by: Penny Zheng <penny.zh...@arm.com>
---
changes v2:
- introduce new interface assign_pages_nr
---
 xen/common/page_alloc.c | 26 +++++++++++++++++---------
 xen/include/xen/mm.h    | 10 ++++++++--
 2 files changed, 25 insertions(+), 11 deletions(-)

diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 8c00262c04..e244d2e52e 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -2301,14 +2301,14 @@ void init_domheap_pages(paddr_t ps, paddr_t pe)
 }
 
 
-int assign_pages(
+int assign_pages_nr(
     struct domain *d,
     struct page_info *pg,
-    unsigned int order,
+    unsigned int nr_pfns,
     unsigned int memflags)
 {
     int rc = 0;
-    unsigned long i;
+    unsigned int i;
 
     spin_lock(&d->page_alloc_lock);
 
@@ -2324,7 +2324,7 @@ int assign_pages(
     {
         unsigned int extra_pages = 0;
 
-        for ( i = 0; i < (1ul << order); i++ )
+        for ( i = 0; i < nr_pfns; i++ )
         {
             ASSERT(!(pg[i].count_info & ~PGC_extra));
             if ( pg[i].count_info & PGC_extra )
@@ -2333,18 +2333,18 @@ int assign_pages(
 
         ASSERT(!extra_pages ||
                ((memflags & MEMF_no_refcount) &&
-                extra_pages == 1u << order));
+                extra_pages == nr_pfns));
     }
 #endif
 
     if ( pg[0].count_info & PGC_extra )
     {
-        d->extra_pages += 1u << order;
+        d->extra_pages += nr_pfns;
         memflags &= ~MEMF_no_refcount;
     }
     else if ( !(memflags & MEMF_no_refcount) )
     {
-        unsigned int tot_pages = domain_tot_pages(d) + (1 << order);
+        unsigned int tot_pages = domain_tot_pages(d) + nr_pfns;
 
         if ( unlikely(tot_pages > d->max_pages) )
         {
@@ -2356,10 +2356,10 @@ int assign_pages(
     }
 
     if ( !(memflags & MEMF_no_refcount) &&
-         unlikely(domain_adjust_tot_pages(d, 1 << order) == (1 << order)) )
+         unlikely(domain_adjust_tot_pages(d, nr_pfns) == nr_pfns) )
         get_knownalive_domain(d);
 
-    for ( i = 0; i < (1 << order); i++ )
+    for ( i = 0; i < nr_pfns; i++ )
     {
         ASSERT(page_get_owner(&pg[i]) == NULL);
         page_set_owner(&pg[i], d);
@@ -2374,6 +2374,14 @@ int assign_pages(
     return rc;
 }
 
+int assign_pages(
+    struct domain *d,
+    struct page_info *pg,
+    unsigned int order,
+    unsigned int memflags)
+{
+    return assign_pages_nr(d, pg, (1U << order), memflags);
+}
 
 struct page_info *alloc_domheap_pages(
     struct domain *d, unsigned int order, unsigned int memflags)
diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index df25e55966..25d970e857 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -131,12 +131,18 @@ int query_page_offline(mfn_t mfn, uint32_t *status);
 
 void heap_init_late(void);
 
-int assign_pages(
+int assign_pages_nr(
     struct domain *d,
     struct page_info *pg,
-    unsigned int order,
+    unsigned int nr_pfns,
     unsigned int memflags);
 
+ int assign_pages(
+     struct domain *d,
+     struct page_info *pg,
+     unsigned int order,
+     unsigned int memflags);
+
 /* Dump info to serial console */
 void arch_dump_shared_mem_info(void);
 
-- 
2.25.1