[PATCH 4/6] mm: New XENMEM, XENMEM_add_to_physmap_gmfn_range

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

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XENMEM_add_to_physmap_gmfn_range is like XENMEM_add_to_physmap on
the gmfn space but the number of pages on which xen will iterate.

Use the 16 bits padding between .domid and .space in struct xen_add_to_physmap
to keep compatibility with older versions.

Signed-off-by: Jean Guyader <jean.guyader@eu.citrix.com>
---
 xen/arch/x86/mm.c           |   22 +++++++++++++++++++++-
 xen/include/public/memory.h |    4 ++++
 2 files changed, 25 insertions(+), 1 deletions(-)


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diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index f75011e..cca64b8 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -4714,9 +4714,29 @@ long arch_memory_op(int op, XEN_GUEST_HANDLE(void) arg)
             return -EPERM;
         }
 
-        xenmem_add_to_physmap(d, xatp);
+        if ( xatp.space != XENMAPSPACE_gmfn_range )
+            xatp.size = 1;
+
+        for ( ; xatp.size > 0; xatp.size-- )
+        {
+            if ( hypercall_preempt_check() )
+            {
+                rc = -EAGAIN;
+                break;
+            }
+            xenmem_add_to_physmap(d, xatp);
+            xatp.idx++;
+            xatp.gpfn++;
+        }
 
         rcu_unlock_domain(d);
+        if ( rc == -EAGAIN )
+        {
+            if ( copy_to_guest(arg, &xatp, 1) )
+                return -EFAULT;
+            rc = hypercall_create_continuation(
+                    __HYPERVISOR_memory_op, "ih", op, arg);
+        }
 
         return rc;
     }
diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h
index 08355e3..8bc8272 100644
--- a/xen/include/public/memory.h
+++ b/xen/include/public/memory.h
@@ -208,10 +208,14 @@ struct xen_add_to_physmap {
     /* Which domain to change the mapping for. */
     domid_t domid;
 
+    /* Number of pages to go through for gmfn_range */
+    uint16_t    size;
+
     /* Source mapping space. */
 #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

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