[Xen-devel] [PATCH v4 5/9] libxc: support XEN_DOMCTL_devour

[Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>]

Introduce new xc_domain_devour() function to support XEN_DOMCTL_devour.

Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
 tools/libxc/include/xenctrl.h | 14 ++++++++++++++
 tools/libxc/xc_domain.c       | 13 +++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 0ad8b8d..a789de3 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -558,6 +558,20 @@ int xc_domain_unpause(xc_interface *xch,
 int xc_domain_destroy(xc_interface *xch,
                       uint32_t domid);
 
+/**
+ * This function sets a 'recipient' domain for a domain (when the source domain
+ * releases memory it is being reassigned to the recipient domain instead of
+ * being freed) and kills the original domain. The destination domain is 
supposed
+ * to have enough max_mem and no pages assigned.
+ *
+ * @parm xch a handle to an open hypervisor interface
+ * @parm domid the source domain id
+ * @parm recipient the destrination domain id
+ * @return 0 on success, -1 on failure
+ */
+int xc_domain_devour(xc_interface *xch,
+                     uint32_t domid, uint32_t recipient);
+
 
 /**
  * This function resumes a suspended domain. The domain should have
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index b864872..5949725 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -122,6 +122,19 @@ int xc_domain_destroy(xc_interface *xch,
     return ret;
 }
 
+int xc_domain_devour(xc_interface *xch, uint32_t domid, uint32_t recipient)
+{
+    int ret;
+    DECLARE_DOMCTL;
+    domctl.cmd = XEN_DOMCTL_devour;
+    domctl.domain = (domid_t)domid;
+    domctl.u.devour.recipient = (domid_t)recipient;
+    do {
+        ret = do_domctl(xch, &domctl);
+    } while ( ret && (errno == EAGAIN) );
+    return ret;
+}
+
 int xc_domain_shutdown(xc_interface *xch,
                        uint32_t domid,
                        int reason)
-- 
1.9.3


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