PoD memory 8/9: libxc interface

Implement libxc interface to PoD functionality:
* Add xc_hvm_build_target_mem(), which takes both memsize and target.
Memsize is the total memory, allocated in PoD pages and reported in
the e820; target is the size of the cache.  If these are the same, the
normal funcitonality is called.  (So you can use the same function to
build always, and it will decide whether to use PoD or not.)
* Add xc_domain_memory_[gs]et_pod_target(), which sets and/or returns
information about the PoD cache and p2m entries.

Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/tools/libxc/xc_private.c b/tools/libxc/xc_private.c
index b37978afe8..5990415d9e 100644
--- a/tools/libxc/xc_private.c
+++ b/tools/libxc/xc_private.c
@@ -323,6 +323,14 @@ int xc_memory_op(int xc_handle,
             goto out1;
         }
         break;
+    case XENMEM_set_pod_target:
+    case XENMEM_get_pod_target:
+        if ( lock_pages(arg, sizeof(struct xen_pod_target)) )
+        {
+            PERROR("Could not lock");
+            goto out1;
+        }
+        break;
     }
 
     ret = do_xen_hypercall(xc_handle, &hypercall);
@@ -355,6 +363,10 @@ int xc_memory_op(int xc_handle,
     case XENMEM_maximum_gpfn:
         unlock_pages(arg, sizeof(domid_t));
         break;
+    case XENMEM_set_pod_target:
+    case XENMEM_get_pod_target:
+        unlock_pages(arg, sizeof(struct xen_pod_target));
+        break;
     }
 
  out1: