[PATCH 4/6] mm: Add new map space for add_to_physmap, XENMAPSPACE_gmfn_range.

[Jean Guyader <jean.guyader@eu.citrix.com>]

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XENMAPSPACE_gmfn_range is like XENMAPSPACE_gmfn but with a size which
is the number of pages on which xen will iterate.

Signed-off-by: Jean Guyader <jean.guyader@eu.citrix.com>
---
 xen/arch/x86/mm.c           |   15 ++++++++++++++-
 xen/include/public/memory.h |    4 ++++
 2 files changed, 18 insertions(+), 1 deletions(-)


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diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index f75011e..77ae77f 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -4629,6 +4629,7 @@ static int xenmem_add_to_physmap(struct domain *d, struct xen_add_to_physmap xat
 
         spin_unlock(&d->grant_table->lock);
         break;
+    case XENMAPSPACE_gmfn_range:
     case XENMAPSPACE_gmfn:
     {
         p2m_type_t p2mt;
@@ -4700,6 +4701,7 @@ long arch_memory_op(int op, XEN_GUEST_HANDLE(void) arg)
     {
         struct xen_add_to_physmap xatp;
         struct domain *d;
+        unsigned int size, i;
 
         if ( copy_from_guest(&xatp, arg, 1) )
             return -EFAULT;
@@ -4714,7 +4716,18 @@ long arch_memory_op(int op, XEN_GUEST_HANDLE(void) arg)
             return -EPERM;
         }
 
-        xenmem_add_to_physmap(d, xatp);
+        size = 1;
+        if ( xatp.space == XENMAPSPACE_gmfn_range )
+        {
+            size = xatp.size;
+        }
+
+        for ( i = 0; i < size; i++ )
+        {
+            xenmem_add_to_physmap(d, xatp);
+            xatp.idx++;
+            xatp.gpfn++;
+        }
 
         rcu_unlock_domain(d);
 
diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h
index 08355e3..860b8c0 100644
--- a/xen/include/public/memory.h
+++ b/xen/include/public/memory.h
@@ -212,6 +212,7 @@ struct xen_add_to_physmap {
 #define XENMAPSPACE_shared_info 0 /* shared info page */
 #define XENMAPSPACE_grant_table 1 /* grant table page */
 #define XENMAPSPACE_gmfn        2 /* GMFN */
+#define XENMAPSPACE_gmfn_range  3 /* GMFN range */
     unsigned int space;
 
 #define XENMAPIDX_grant_table_status 0x80000000
@@ -221,6 +222,9 @@ struct xen_add_to_physmap {
 
     /* GPFN where the source mapping page should appear. */
     xen_pfn_t     gpfn;
+
+    /* Number of page, used for GMFN range */
+    unsigned int size;
 };
 typedef struct xen_add_to_physmap xen_add_to_physmap_t;
 DEFINE_XEN_GUEST_HANDLE(xen_add_to_physmap_t);

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