[Xen-devel] [PATCH for-4.12 v2 3/7] xen/arm: p2m: Introduce an helper to allocate the root page-table

[Julien Grall <julien.grall@xxxxxxx>]

A follow-up patch will require to allocate the root page-table without
having a domain in hand.

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Reviewed-by: Andrii Anisov <andrii_anisov@xxxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

---
    Changes in v2:
        - Add Andrii's and Stefano's reviewed-by
---
 xen/arch/arm/p2m.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 38bfa9964f..9844bfb936 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -1353,21 +1353,29 @@ int guest_physmap_remove_page(struct domain *d, gfn_t 
gfn, mfn_t mfn,
     return p2m_remove_mapping(d, gfn, (1 << page_order), mfn);
 }
 
-static int p2m_alloc_table(struct domain *d)
+static struct page_info *p2m_allocate_root(void)
 {
-    struct p2m_domain *p2m = p2m_get_hostp2m(d);
     struct page_info *page;
     unsigned int i;
 
     page = alloc_domheap_pages(NULL, P2M_ROOT_ORDER, 0);
     if ( page == NULL )
-        return -ENOMEM;
+        return NULL;
 
     /* Clear both first level pages */
     for ( i = 0; i < P2M_ROOT_PAGES; i++ )
         clear_and_clean_page(page + i);
 
-    p2m->root = page;
+    return page;
+}
+
+static int p2m_alloc_table(struct domain *d)
+{
+    struct p2m_domain *p2m = p2m_get_hostp2m(d);
+
+    p2m->root = p2m_allocate_root();
+    if ( !p2m->root )
+        return -ENOMEM;
 
     p2m->vttbr = generate_vttbr(p2m->vmid, page_to_mfn(p2m->root));
 
-- 
2.11.0


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