xen/arm: p2m: Introduce a helper to check if an entry is a superpage

Use the level and the entry to know whether an entry is a superpage.
A superpage can only happen below level 3.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Tested-by: Tamas K Lengyel <tamas@tklengyel.com>

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index c5695efb88bf15902e52f25a23ec5c78abf5d76e..02ee9c117698793f596b4a1505f7b7768e2bcf34 100644 (file)
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -57,6 +57,11 @@ static inline bool_t p2m_mapping(lpae_t pte)
     return p2m_valid(pte) && !pte.p2m.table;
 }
 
+static inline bool p2m_is_superpage(lpae_t pte, unsigned int level)
+{
+    return (level < 3) && p2m_mapping(pte);
+}
+
 static inline void p2m_write_lock(struct p2m_domain *p2m)
 {
     write_lock(&p2m->lock);