[Xen-devel] [PATCH v2 RFC 2/3] xen: provide empty stubs for guest_physmap_(un)pin_range on arm and x86

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

guest_physmap_pin_range pins a range of guest pages so that they p2m
mappings won't be changed.
guest_physmap_unpin_range unpins the previously pinned pages.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 xen/include/asm-arm/mm.h  |   12 ++++++++++++
 xen/include/asm-x86/p2m.h |   12 ++++++++++++
 2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
index 5e7c5a3..d88fa6c 100644
--- a/xen/include/asm-arm/mm.h
+++ b/xen/include/asm-arm/mm.h
@@ -319,6 +319,18 @@ void free_init_memory(void);
 
 int guest_physmap_mark_populate_on_demand(struct domain *d, unsigned long gfn,
                                           unsigned int order);
+static inline int guest_physmap_pin_range(struct domain *d,
+                                          xen_pfn_t gpfn,
+                                          unsigned int order)
+{
+    return -ENOSYS;
+}
+static inline int guest_physmap_unpin_range(struct domain *d,
+                                            xen_pfn_t gpfn,
+                                            unsigned int order)
+{
+    return -ENOSYS;
+}
 
 extern void put_page_type(struct page_info *page);
 static inline void put_page_and_type(struct page_info *page)
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index 43583b2..afc7738 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -492,6 +492,18 @@ void guest_physmap_remove_page(struct domain *d,
 /* Set a p2m range as populate-on-demand */
 int guest_physmap_mark_populate_on_demand(struct domain *d, unsigned long gfn,
                                           unsigned int order);
+static inline int guest_physmap_pin_range(struct domain *d,
+                                          xen_pfn_t gpfn,
+                                          unsigned int order)
+{
+    return -ENOSYS;
+}
+int guest_physmap_unpin_range(struct domain *d,
+                              xen_pfn_t gpfn,
+                              unsigned int order)
+{
+    return -ENOSYS;
+}
 
 /* Change types across all p2m entries in a domain */
 void p2m_change_entry_type_global(struct domain *d, 
-- 
1.7.2.5


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