[Xen-devel] [PATCH v3 2/3] x86/mm: Introduce altp2m_set_entry_by_page_order

[Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>]

This patch moves common code from p2m_set_altp2m_mem_access() and
p2m_change_altp2m_gfn() into one function

Signed-off-by: Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/mm/mem_access.c |  2 +-
 xen/include/asm-x86/p2m.h    | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/mm/mem_access.c b/xen/arch/x86/mm/mem_access.c
index bf67ddb15a..6a22512555 100644
--- a/xen/arch/x86/mm/mem_access.c
+++ b/xen/arch/x86/mm/mem_access.c
@@ -279,7 +279,7 @@ int p2m_set_altp2m_mem_access(struct domain *d, struct 
p2m_domain *hp2m,
         gfn_t gfn2 = _gfn(gfn_l & mask);
         mfn_t mfn2 = _mfn(mfn_x(mfn) & mask);
 
-        /* Note: currently it is not safe to remap to a shared entry */
+       /* Note: currently it is not safe to remap to a shared entry */
         if ( t != p2m_ram_rw )
             return -ESRCH;
 
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index 6de1546d76..90a6c135a7 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -467,6 +467,17 @@ static inline mfn_t altp2m_get_gfn_type_access(
     return mfn;
 }
 
+static inline int altp2m_set_entry_by_page_order(
+    struct p2m_domain *ap2m, unsigned long gfn,  mfn_t mfn,
+    unsigned int page_order, p2m_type_t t, p2m_access_t a)
+{
+    unsigned long mask = ~((1UL << page_order) - 1);
+    gfn_t gfn2 = _gfn(gfn & mask);
+    mfn_t mfn2 = _mfn(mfn_x(mfn) & mask);
+
+    return ap2m->set_entry(ap2m, gfn2, mfn2, page_order, t, a, 1);
+}
+
 /* Syntactic sugar: most callers will use one of these. */
 #define get_gfn(d, g, t)         get_gfn_type((d), (g), (t), P2M_ALLOC)
 #define get_gfn_query(d, g, t)   get_gfn_type((d), (g), (t), 0)
-- 
2.17.1

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