[PATCHv1 2/5] tools/libxc: add xc_domain_get_param() and xc_domain_set_param()

[David Vrabel <david.vrabel@citrix.com>]

These are a thin wrapper around the XEN_DOMCTL_param hypercall.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
---
 tools/libxc/include/xenctrl.h |  5 +++++
 tools/libxc/xc_domain.c       | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 42eafa4..862c748 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -812,6 +812,11 @@ int xc_domain_hvm_setcontext(xc_interface *xch,
 const char *xc_domain_get_native_protocol(xc_interface *xch,
                                           uint32_t domid);
 
+int xc_domain_get_param(xc_interface *xch, unsigned int domid,
+                        uint32_t param, uint64_t *value);
+int xc_domain_set_param(xc_interface *xch, unsigned int domid,
+                        uint32_t param, uint64_t value, uint64_t *old_value);
+
 /**
  * This function returns information about the execution context of a
  * particular vcpu of a domain.
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index 4fa993a..4caa250 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -2574,6 +2574,41 @@ int xc_domain_soft_reset(xc_interface *xch,
     domctl.domain = (domid_t)domid;
     return do_domctl(xch, &domctl);
 }
+
+static int xc_domain_param(xc_interface *xch, unsigned int domid,
+                           uint32_t param, int set, uint64_t *value)
+{
+    int ret;
+    DECLARE_DOMCTL;
+
+    domctl.cmd = XEN_DOMCTL_param;
+    domctl.domain = domid;
+    domctl.u.param.param = param | (set ? XEN_DOMCTL_PARAM_SET : 0);
+    domctl.u.param.value = *value;
+
+    ret = do_domctl(xch, &domctl);
+    if ( ret == 0 )
+        *value = domctl.u.param.value;
+    return ret;
+}
+
+int xc_domain_get_param(xc_interface *xch, unsigned int domid,
+                        uint32_t param, uint64_t *value)
+{
+    return xc_domain_param(xch, domid, param, 0, value);
+}
+
+int xc_domain_set_param(xc_interface *xch, unsigned int domid,
+                        uint32_t param, uint64_t value, uint64_t *old_value)
+{
+    int ret;
+
+    ret = xc_domain_param(xch, domid, param, 1, &value);
+    if ( ret == 0 && old_value )
+        *old_value = value;
+    return ret;
+}
+
 /*
  * Local variables:
  * mode: C
-- 
2.1.4