[PATCH 10/11] libxc: add xc_domain_set_max_evtchn()

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

From: David Vrabel <david.vrabel@citrix.com>

Add xc_domain_set_max_evtchn(), a wrapper around the
DOMCTL_set_max_evtchn hypercall.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
---
 tools/libxc/xc_domain.c |   11 +++++++++++
 tools/libxc/xenctrl.h   |   12 ++++++++++++
 2 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index 81316d3..2cea6e3 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -1766,6 +1766,17 @@ int xc_domain_set_virq_handler(xc_interface *xch, uint32_t domid, int virq)
     return do_domctl(xch, &domctl);
 }
 
+int xc_domain_set_max_evtchn(xc_interface *xch, uint32_t domid,
+                             uint32_t max_port)
+{
+    DECLARE_DOMCTL;
+
+    domctl.cmd = XEN_DOMCTL_set_max_evtchn;
+    domctl.domain = domid;
+    domctl.u.set_max_evtchn.max_port = max_port;
+    return do_domctl(xch, &domctl);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index 58d51f3..8cf3f3b 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -847,6 +847,18 @@ int xc_domain_set_access_required(xc_interface *xch,
  */
 int xc_domain_set_virq_handler(xc_interface *xch, uint32_t domid, int virq);
 
+/**
+ * Set the maximum event channel port a domain may bind.
+ *
+ * This does not affect ports that are already bound.
+ *
+ * @param xch a handle to an open hypervisor interface
+ * @param domid the domain id
+ * @param max_port maximum port number
+ */
+int xc_domain_set_max_evtchn(xc_interface *xch, uint32_t domid,
+                             uint32_t max_port);
+
 /*
  * CPUPOOL MANAGEMENT FUNCTIONS
  */
-- 
1.7.2.5