libxc: add function to set hypervisor parameters

Add a new libxc function to set hypervisor parameters at runtime
similar to boot time parameters via command line.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index c7710b8f36303ba7eae0a8184eb2b67b37364104..ad5e6b3d773b98b5fd2f786e0a12005e1d0ee2d4 100644 (file)
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -1210,6 +1210,7 @@ int xc_readconsolering(xc_interface *xch,
                        int clear, int incremental, uint32_t *pindex);
 
 int xc_send_debug_keys(xc_interface *xch, char *keys);
+int xc_set_parameters(xc_interface *xch, char *params);
 
 typedef xen_sysctl_physinfo_t xc_physinfo_t;
 typedef xen_sysctl_cputopo_t xc_cputopo_t;

diff --git a/tools/libxc/xc_misc.c b/tools/libxc/xc_misc.c
index 2303293c6c1de9d504d62119a54385c56385a569..7e15e904e3de52c12eec2af8221ab338204dc1d7 100644 (file)
--- a/tools/libxc/xc_misc.c
+++ b/tools/libxc/xc_misc.c
@@ -187,6 +187,27 @@ int xc_send_debug_keys(xc_interface *xch, char *keys)
     return ret;
 }
 
+int xc_set_parameters(xc_interface *xch, char *params)
+{
+    int ret, len = strlen(params);
+    DECLARE_SYSCTL;
+    DECLARE_HYPERCALL_BOUNCE(params, len, XC_HYPERCALL_BUFFER_BOUNCE_IN);
+
+    if ( xc_hypercall_bounce_pre(xch, params) )
+        return -1;
+
+    sysctl.cmd = XEN_SYSCTL_set_parameter;
+    set_xen_guest_handle(sysctl.u.set_parameter.params, params);
+    sysctl.u.set_parameter.size = len;
+    memset(sysctl.u.set_parameter.pad, 0, sizeof(sysctl.u.set_parameter.pad));
+
+    ret = do_sysctl(xch, &sysctl);
+
+    xc_hypercall_bounce_post(xch, params);
+
+    return ret;
+}
+
 int xc_physinfo(xc_interface *xch,
                 xc_physinfo_t *put_info)
 {