[RFC][v3][PATCH 2/6] xen:x86: introduce a new hypercall to get RMRR mappings

[Tiejun Chen <tiejun.chen@intel.com>]

We need this new hypercall to get RMRR mapping for VM.

Signed-off-by: Tiejun Chen <tiejun.chen@intel.com>
---
 xen/arch/x86/x86_64/compat/mm.c |  9 +++++++++
 xen/include/public/memory.h     | 14 +++++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/x86_64/compat/mm.c b/xen/arch/x86/x86_64/compat/mm.c
index 69c6195..ff16f17 100644
--- a/xen/arch/x86/x86_64/compat/mm.c
+++ b/xen/arch/x86/x86_64/compat/mm.c
@@ -132,6 +132,15 @@ int compat_arch_memory_op(unsigned long cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
         break;
     }
 
+    case XENMEM_reserved_device_memory_map:
+    {
+        /* Currently we just need to cover RMRR. */
+        if ( copy_to_guest(arg, &rmrr_maps, 1) )
+            return -EFAULT;
+
+        return 0;
+    }
+
     case XENMEM_machphys_mapping:
     {
         struct domain *d = current->domain;
diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h
index 2c57aa0..13e539f 100644
--- a/xen/include/public/memory.h
+++ b/xen/include/public/memory.h
@@ -523,7 +523,19 @@ DEFINE_XEN_GUEST_HANDLE(xen_mem_sharing_op_t);
 
 #endif /* defined(__XEN__) || defined(__XEN_TOOLS__) */
 
-/* Next available subop number is 26 */
+/*
+ * Some devices may reserve some range.
+ *
+ * Currently we just have RMRR
+ * - Reserved memory Region Reporting Structure,
+ * So returns the RMRR memory map as it was when the domain
+ * was started.
+ */
+#define XENMEM_reserved_device_memory_map   26
+typedef struct xen_memory_map xen_rmrr_memory_map_t;
+DEFINE_XEN_GUEST_HANDLE(xen_rmrr_memory_map_t);
+
+/* Next available subop number is 27 */
 
 #endif /* __XEN_PUBLIC_MEMORY_H__ */
 
-- 
1.9.1