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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 3/8] [libxc] Domain Groups: libxc handlers for group data
libxc: Augment libxc framework to shuttle group data and commands between xend and the VMM. diff -r ecb6cd61a9cf tools/libxc/Makefile
--- a/tools/libxc/Makefile Tue Feb 20 12:27:03 2007 +0000
+++ b/tools/libxc/Makefile Tue Feb 20 12:59:11 2007 -0500
@@ -7,6 +7,7 @@ CTRL_SRCS-y :=
CTRL_SRCS-y :=
CTRL_SRCS-y += xc_core.c
CTRL_SRCS-y += xc_domain.c
+CTRL_SRCS-y += xc_domain_group.c
CTRL_SRCS-y += xc_evtchn.c
CTRL_SRCS-y += xc_misc.c
CTRL_SRCS-y += xc_acm.c
diff -r ecb6cd61a9cf tools/libxc/xc_domain.c
--- a/tools/libxc/xc_domain.c Tue Feb 20 12:27:03 2007 +0000
+++ b/tools/libxc/xc_domain.c Tue Feb 20 12:59:11 2007 -0500
@@ -191,6 +191,7 @@ int xc_domain_getinfo(int xc_handle,
info->crashed = 1;
}
+ info->grpid = domctl.u.getdomaininfo.group;
info->ssidref = domctl.u.getdomaininfo.ssidref;
info->nr_pages = domctl.u.getdomaininfo.tot_pages;
info->max_memkb = domctl.u.getdomaininfo.max_pages << (PAGE_SHIFT-10);
@@ -201,6 +202,9 @@ int xc_domain_getinfo(int xc_handle,
memcpy(info->handle, domctl.u.getdomaininfo.handle,
sizeof(xen_domain_handle_t));
+
+ memcpy(info->dg_handle, domctl.u.getdomaininfo.dg_handle,
+ sizeof(xen_domain_group_handle_t));
next_domid = (uint16_t)domctl.domain + 1;
info++;
diff -r ecb6cd61a9cf tools/libxc/xc_private.h
--- a/tools/libxc/xc_private.h Tue Feb 20 12:27:03 2007 +0000
+++ b/tools/libxc/xc_private.h Tue Feb 20 12:59:11 2007 -0500
@@ -23,10 +23,12 @@
#ifdef VALGRIND
#define DECLARE_HYPERCALL privcmd_hypercall_t hypercall = { 0 }
#define DECLARE_DOMCTL struct xen_domctl domctl = { 0 }
+#define DECLARE_DOMGRPCTL struct xen_domgrpctl domgrpctl = { 0 }
#define DECLARE_SYSCTL struct xen_sysctl sysctl = { 0 }
#else
#define DECLARE_HYPERCALL privcmd_hypercall_t hypercall
#define DECLARE_DOMCTL struct xen_domctl domctl
+#define DECLARE_DOMGRPCTL struct xen_domgrpctl domgrpctl
#define DECLARE_SYSCTL struct xen_sysctl sysctl
#endif
@@ -118,6 +120,35 @@ static inline int do_domctl(int xc_handl
return ret;
}
+static inline int do_domgrpctl(int xc_handle, struct xen_domgrpctl *domgrpctl)
+{
+ int ret = -1;
+ DECLARE_HYPERCALL;
+
+ domgrpctl->interface_version = XEN_DOMGRPCTL_INTERFACE_VERSION;
+
+ hypercall.op = __HYPERVISOR_domgrpctl;
+ hypercall.arg[0] = (unsigned long)domgrpctl;
+
+ if ( mlock(domgrpctl, sizeof(*domgrpctl)) != 0 )
+ {
+ PERROR("Could not lock memory for Xen hypercall");
+ goto out1;
+ }
+
+ if ( (ret = do_xen_hypercall(xc_handle, &hypercall)) < 0 )
+ {
+ if ( errno == EACCES )
+ DPRINTF("domgrpctl operation failed -- need to"
+ " rebuild the user-space tool set?\n");
+ }
+
+ safe_munlock(domgrpctl, sizeof(*domgrpctl));
+
+ out1:
+ return ret;
+}
+
static inline int do_sysctl(int xc_handle, struct xen_sysctl *sysctl)
{
int ret = -1;
diff -r ecb6cd61a9cf tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h Tue Feb 20 12:27:03 2007 +0000
+++ b/tools/libxc/xenctrl.h Tue Feb 20 12:59:11 2007 -0500
@@ -18,6 +18,7 @@
#include <stdint.h>
#include <xen/xen.h>
#include <xen/domctl.h>
+#include <xen/domgrpctl.h>
#include <xen/sysctl.h>
#include <xen/version.h>
#include <xen/event_channel.h>
@@ -147,6 +148,7 @@ int xc_waitdomain(
typedef struct xc_dominfo {
uint32_t domid;
+ uint32_t grpid;
uint32_t ssidref;
unsigned int dying:1, crashed:1, shutdown:1,
paused:1, blocked:1, running:1,
@@ -159,7 +161,15 @@ typedef struct xc_dominfo {
unsigned int nr_online_vcpus;
unsigned int max_vcpu_id;
xen_domain_handle_t handle;
+ xen_domain_group_handle_t dg_handle;
} xc_dominfo_t;
+
+typedef struct{
+ dgid_t dgid;
+ uint16_t size;
+ domid_t member_list[MAX_GROUP_SIZE];
+ xen_domain_group_handle_t handle;
+} xc_grpinfo_t;
typedef xen_domctl_getdomaininfo_t xc_domaininfo_t;
int xc_domain_create(int xc_handle,
@@ -292,6 +302,27 @@ int xc_domain_getinfo(int xc_handle,
unsigned int max_doms,
xc_dominfo_t *info);
+int xc_domain_group_getinfo(int xc_handle,
+ uint32_t first_dgid,
+ unsigned int max_grps,
+ xc_grpinfo_t *info);
+
+int xc_domain_group_create(int xc_handle,
+ xen_domain_group_handle_t handle,
+ uint32_t *pdgid);
+
+int xc_domain_group_pause(int xc_handle,
+ uint32_t dgid);
+
+int xc_domain_group_unpause(int xc_handle,
+ uint32_t dgid);
+
+int xc_domain_group_destroy(int xc_handle,
+ uint32_t dgid);
+
+int xc_domain_group_join(int xc_handle,
+ uint32_t domid,
+ uint32_t dgid);
/**
* This function will set the execution context for the specified vcpu.
diff -r ecb6cd61a9cf tools/python/xen/lowlevel/xc/xc.c
--- a/tools/python/xen/lowlevel/xc/xc.c Tue Feb 20 12:27:03 2007 +0000
+++ b/tools/python/xen/lowlevel/xc/xc.c Tue Feb 20 12:59:11 2007 -0500
@@ -36,10 +36,6 @@ typedef struct {
int xc_handle;
} XcObject;
-
-static PyObject *dom_op(XcObject *self, PyObject *args,
- int (*fn)(int, uint32_t));
-
static PyObject *pyxc_error_to_exception(void)
{
PyObject *pyerr;
@@ -59,6 +55,21 @@ static PyObject *pyxc_error_to_exception
PyErr_SetObject(xc_error_obj, pyerr);
return NULL;
+}
+
+static PyObject *xcop(XcObject *self, PyObject *args,
+ int (*fn)(int, uint32_t))
+{
+ uint32_t id; /* used for both domid and grpid */
+
+ if (!PyArg_ParseTuple(args, "i", &id))
+ return NULL;
+
+ if (fn(self->xc_handle, id) != 0)
+ return pyxc_error_to_exception();
+
+ Py_INCREF(zero);
+ return zero;
}
static PyObject *pyxc_domain_dumpcore(XcObject *self, PyObject *args)
@@ -147,17 +158,17 @@ static PyObject *pyxc_domain_max_vcpus(X
static PyObject *pyxc_domain_pause(XcObject *self, PyObject *args)
{
- return dom_op(self, args, xc_domain_pause);
+ return xcop(self, args, xc_domain_pause);
}
static PyObject *pyxc_domain_unpause(XcObject *self, PyObject *args)
{
- return dom_op(self, args, xc_domain_unpause);
+ return xcop(self, args, xc_domain_unpause);
}
static PyObject *pyxc_domain_destroy(XcObject *self, PyObject *args)
{
- return dom_op(self, args, xc_domain_destroy);
+ return xcop(self, args, xc_domain_destroy);
}
static PyObject *pyxc_domain_shutdown(XcObject *self, PyObject *args)
@@ -176,7 +187,7 @@ static PyObject *pyxc_domain_shutdown(Xc
static PyObject *pyxc_domain_resume(XcObject *self, PyObject *args)
{
- return dom_op(self, args, xc_domain_resume);
+ return xcop(self, args, xc_domain_resume);
}
static PyObject *pyxc_vcpu_setaffinity(XcObject *self,
@@ -295,11 +306,15 @@ static PyObject *pyxc_domain_getinfo(XcO
for ( i = 0 ; i < nr_doms; i++ )
{
PyObject *pyhandle = PyList_New(sizeof(xen_domain_handle_t));
+ PyObject *pydg_handle = PyList_New(sizeof(xen_domain_group_handle_t));
for ( j = 0; j < sizeof(xen_domain_handle_t); j++ )
PyList_SetItem(pyhandle, j, PyInt_FromLong(info[i].handle[j]));
+ for ( j = 0; j < sizeof(xen_domain_group_handle_t); j++ )
+ PyList_SetItem(pydg_handle, j,
PyInt_FromLong(info[i].dg_handle[j]));
info_dict = Py_BuildValue("{s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i,s:i"
- ",s:l,s:L,s:l,s:i,s:i}",
+ ",s:i,s:l,s:L,s:l,s:i,s:i}",
"domid", info[i].domid,
+ "dgid", info[i].grpid,
"online_vcpus", info[i].nr_online_vcpus,
"max_vcpu_id", info[i].max_vcpu_id,
"hvm", info[i].hvm,
@@ -315,6 +330,7 @@ static PyObject *pyxc_domain_getinfo(XcO
"ssidref", info[i].ssidref,
"shutdown_reason", info[i].shutdown_reason);
PyDict_SetItemString(info_dict, "handle", pyhandle);
+ PyDict_SetItemString(info_dict, "dg_handle", pydg_handle);
Py_DECREF(pyhandle);
PyList_SetItem(list, i, info_dict);
}
@@ -936,21 +952,6 @@ static PyObject *pyxc_domain_set_time_of
return zero;
}
-static PyObject *dom_op(XcObject *self, PyObject *args,
- int (*fn)(int, uint32_t))
-{
- uint32_t dom;
-
- if (!PyArg_ParseTuple(args, "i", &dom))
- return NULL;
-
- if (fn(self->xc_handle, dom) != 0)
- return pyxc_error_to_exception();
-
- Py_INCREF(zero);
- return zero;
-}
-
#ifdef __powerpc__
static PyObject *pyxc_alloc_real_mode_area(XcObject *self,
PyObject *args,
@@ -1013,6 +1014,148 @@ static PyObject *pyxc_prose_build(XcObje
}
#endif /* powerpc */
+#define EXTRACT_DOM_LIST(list_name, dict) \
+ dom_list = PyList_New(0); \
+ for ( j = 0; j < info[i].size; j++ ) \
+ PyList_Append(dom_list, PyInt_FromLong(info[i].list_name[j]));\
+ PyDict_SetItemString(dict, #list_name, dom_list); \
+ Py_DECREF(dom_list);
+
+static PyObject *pyxc_domain_group_getinfo(XcObject *self,
+ PyObject *args,
+ PyObject *kwds)
+{
+ PyObject *list, *info_dict, *dom_list, *pyhandle;
+
+ uint32_t first_grp = 0;
+ /* max_grps is unrealistically large and causes a large heap allocation
+ for the duration of this function that, in the vast majority of cases,
+ will be very sparsely populated with information about real groups.
+
+ Leaving this alone for now to keep an equal limit on max number of
+ groups in both the VMM and the control stack.
+
+ Could add a new case to the domain group control hypercall to return
+ the current number of groups instead of assuming the worst case...
+ */
+ int max_grps = NULL_GROUP_ID+1, nr_grps, i, j;
+ xc_grpinfo_t *info;
+
+ static char *kwd_list[] = { "first_grp", "max_grps", NULL };
+
+ /* pull values from python args */
+ if ( !PyArg_ParseTupleAndKeywords(args, kwds, "|ii", kwd_list,
+ &first_grp, &max_grps) )
+ return NULL;
+
+ /* alloc space for the group info and ask Xen (via libxc) for the info */
+ if ( (info = malloc(max_grps * sizeof(xc_grpinfo_t))) == NULL )
+ return PyErr_NoMemory();
+ nr_grps = xc_domain_group_getinfo(self->xc_handle, first_grp, max_grps,
+ info);
+
+ if (nr_grps < 0) {
+ free(info);
+ return PyErr_SetFromErrno(xc_error_obj);
+ }
+
+ /* iterate over the returned groups and
+ put the returned values into python objects */
+ list = PyList_New(nr_grps);
+ for ( i = 0 ; i < nr_grps; i++ ) {
+ /* extract group ID and size */
+ info_dict = Py_BuildValue(
+ "{s:i,s:i}",
+ "dgid", info[i].dgid,
+ "size", info[i].size);
+
+ EXTRACT_DOM_LIST(member_list, info_dict);
+
+ /* extract the group's handle */
+ pyhandle = PyList_New(sizeof(xen_domain_group_handle_t));
+ for ( j = 0; j < sizeof(xen_domain_group_handle_t); j++ )
+ PyList_SetItem(pyhandle, j, PyInt_FromLong(info[i].handle[j]));
+ PyDict_SetItemString(info_dict, "dg_handle", pyhandle);
+ Py_DECREF(pyhandle);
+
+ PyList_SetItem(list, i, info_dict);
+ }
+
+ free(info);
+
+ return list;
+}
+
+static PyObject *pyxc_domain_group_create(XcObject *self,
+ PyObject *args,
+ PyObject *kwds)
+{
+ uint32_t dgid = 0;
+ int i;
+ PyObject *pyhandle = NULL;
+ xen_domain_group_handle_t handle = {
+ 0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe, 0xef,
+ 0xde, 0xad, 0xbe, 0xef, 0xde, 0xad, 0xbe, 0xef };
+
+ static char *kwd_list[] = { "handle", NULL };
+
+ if ( !PyArg_ParseTupleAndKeywords(args, kwds, "|O", kwd_list,
+ &pyhandle))
+ return NULL;
+
+ if ( pyhandle != NULL )
+ {
+ if ( !PyList_Check(pyhandle) ||
+ (PyList_Size(pyhandle) != sizeof(xen_domain_group_handle_t)) )
+ goto out_exception;
+
+ for ( i = 0; i < sizeof(xen_domain_group_handle_t); i++ )
+ {
+ PyObject *p = PyList_GetItem(pyhandle, i);
+ if ( !PyInt_Check(p) )
+ goto out_exception;
+ handle[i] = (uint8_t)PyInt_AsLong(p);
+ }
+ } else
+ goto out_exception;
+
+ if ( (xc_domain_group_create(self->xc_handle, handle, &dgid)) < 0 )
+ return PyErr_SetFromErrno(xc_error_obj);
+
+ return PyInt_FromLong(dgid);
+
+out_exception:
+ errno = EINVAL;
+ PyErr_SetFromErrno(xc_error_obj);
+ return NULL;
+}
+
+static PyObject *pyxc_domain_group_pause(XcObject *self, PyObject *args)
+{
+ return xcop(self, args, xc_domain_group_pause);
+}
+
+static PyObject *pyxc_domain_group_unpause(XcObject *self, PyObject *args)
+{
+ return xcop(self, args, xc_domain_group_unpause);
+}
+
+static PyObject *pyxc_domain_group_destroy(XcObject *self, PyObject *args)
+{
+ return xcop(self, args, xc_domain_group_destroy);
+}
+
+static PyObject *pyxc_domain_group_join(XcObject *self, PyObject *args)
+{
+ uint32_t dgid, domid;
+ if (!PyArg_ParseTuple(args, "ii", &domid, &dgid))
+ return NULL;
+ if (xc_domain_group_join(self->xc_handle, domid, dgid) != 0)
+ return PyErr_SetFromErrno(xc_error_obj);
+ Py_INCREF(zero);
+ return zero;
+}
+
static PyMethodDef pyxc_methods[] = {
{ "handle",
(PyCFunction)pyxc_handle,
@@ -1027,6 +1170,13 @@ static PyMethodDef pyxc_methods[] = {
" dom [int, 0]: Domain identifier to use (allocated if
zero).\n"
"Returns: [int] new domain identifier; -1 on error.\n" },
+ { "domain_group_create",
+ (PyCFunction)pyxc_domain_group_create,
+ METH_VARARGS | METH_KEYWORDS, "\n"
+ "Create a new domain group.\n"
+ " grp [int, 0]: Domain group identifier to use (allocated if
zero).\n"
+ "Returns: [int] new domain group identifier; -1 on error.\n" },
+
{ "domain_max_vcpus",
(PyCFunction)pyxc_domain_max_vcpus,
METH_VARARGS, "\n"
@@ -1050,6 +1200,13 @@ static PyMethodDef pyxc_methods[] = {
" dom [int]: Identifier of domain to be paused.\n\n"
"Returns: [int] 0 on success; -1 on error.\n" },
+ { "domain_group_pause",
+ (PyCFunction)pyxc_domain_group_pause,
+ METH_VARARGS, "\n"
+ "Temporarily pause execution of all domains in a group.\n"
+ " grp [int]: Identifier of domain group to be paused.\n\n"
+ "Returns: [int] 0 on success; -1 on error.\n" },
+
{ "domain_unpause",
(PyCFunction)pyxc_domain_unpause,
METH_VARARGS, "\n"
@@ -1057,11 +1214,25 @@ static PyMethodDef pyxc_methods[] = {
" dom [int]: Identifier of domain to be unpaused.\n\n"
"Returns: [int] 0 on success; -1 on error.\n" },
+ { "domain_group_unpause",
+ (PyCFunction)pyxc_domain_group_unpause,
+ METH_VARARGS, "\n"
+ "(Re)start execution of all domains in a group.\n"
+ " grp [int]: Identifier of domain group to be unpaused.\n\n"
+ "Returns: [int] 0 on success; -1 on error.\n" },
+
{ "domain_destroy",
(PyCFunction)pyxc_domain_destroy,
METH_VARARGS, "\n"
"Destroy a domain.\n"
" dom [int]: Identifier of domain to be destroyed.\n\n"
+ "Returns: [int] 0 on success; -1 on error.\n" },
+
+ { "domain_group_destroy",
+ (PyCFunction)pyxc_domain_group_destroy,
+ METH_VARARGS, "\n"
+ "Destroy an empty domain group.\n"
+ " grp [int]: Identifier of domain group to be destroyed.\n\n"
"Returns: [int] 0 on success; -1 on error.\n" },
{ "domain_resume",
@@ -1129,6 +1300,20 @@ static PyMethodDef pyxc_methods[] = {
" shutdown_reason [int]: Numeric code from guest OS, explaining "
"reason why it shut itself down.\n" },
+ { "domain_group_getinfo",
+ (PyCFunction)pyxc_domain_group_getinfo,
+ METH_VARARGS | METH_KEYWORDS, "\n"
+ "Get information regarding a set of domain groups.\n"
+ " first_grp [int, 0]: First domain to retrieve info about.\n"
+ " max_grps [int, 1024]: Maximum number of domains to retrieve info"
+ " about.\n\n"
+ "Returns: [list of dicts] if list length is less than 'max_grps'\n"
+ " parameter then there was an error, or the end of the\n"
+ " group-id space was reached.\n"
+ " grp [int]: Id of group to which this info pertains\n"
+ " size [int]: Number of domains in this group\n"
+ " member_list [int array]: Unordered list of member Ids\n"},
+
{ "vcpu_getinfo",
(PyCFunction)pyxc_vcpu_getinfo,
METH_VARARGS | METH_KEYWORDS, "\n"
@@ -1337,6 +1522,14 @@ static PyMethodDef pyxc_methods[] = {
METH_VARARGS, "\n"
"Set a domain's time offset to Dom0's localtime\n"
" dom [int]: Domain whose time offset is being set.\n"
+ "Returns: [int] 0 on success; -1 on error.\n" },
+
+ { "domain_group_join",
+ (PyCFunction)pyxc_domain_group_join,
+ METH_VARARGS, "\n"
+ "Request that the given domain join the supplied group.\n"
+ " dom [int]: Identifier of domain joining group.\n"
+ " grp [int]: Identifier of group the given domain is joining.\n"
"Returns: [int] 0 on success; -1 on error.\n" },
#ifdef __powerpc__
diff -r ecb6cd61a9cf tools/libxc/xc_domain_group.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/libxc/xc_domain_group.c Tue Feb 20 12:59:11 2007 -0500
@@ -0,0 +1,100 @@
+/******************************************************************************
+ * xc_domain_group.c
+ *
+ * API for manipulating and obtaining information on domain groups.
+ *
+ * Chris Bookholt (hap10@xxxxxxxxxxxxxx)
+ */
+
+#include "xc_private.h"
+#include <xen/memory.h>
+
+int xc_domain_group_create(int xc_handle,
+ xen_domain_group_handle_t handle,
+ uint32_t *pdgid)
+{
+ int err;
+ DECLARE_DOMGRPCTL;
+ domgrpctl.cmd = XEN_DOMGRPCTL_creategrp;
+ memcpy(domgrpctl.u.create_grp.handle, handle,
+ sizeof(xen_domain_group_handle_t));
+
+ err = do_domgrpctl(xc_handle, &domgrpctl);
+ if (err)
+ return err;
+
+ *pdgid = (uint16_t)domgrpctl.u.get_grp_info.dgid;
+ return 0;
+}
+
+int xc_domain_group_pause(int xc_handle, uint32_t dgid)
+{
+ DECLARE_DOMGRPCTL;
+ domgrpctl.cmd = XEN_DOMGRPCTL_pausegrp;
+ domgrpctl.u.pause_grp.dgid = (dgid_t) dgid;
+ return do_domgrpctl(xc_handle, &domgrpctl);
+}
+
+int xc_domain_group_unpause(int xc_handle, uint32_t dgid)
+{
+ DECLARE_DOMGRPCTL;
+ domgrpctl.cmd = XEN_DOMGRPCTL_unpausegrp;
+ domgrpctl.u.unpause_grp.dgid = (dgid_t) dgid;
+ return do_domgrpctl(xc_handle, &domgrpctl);
+}
+
+int xc_domain_group_destroy(int xc_handle, uint32_t dgid)
+{
+ DECLARE_DOMGRPCTL;
+ domgrpctl.cmd = XEN_DOMGRPCTL_destroygrp;
+ domgrpctl.u.destroy_grp.dgid = (dgid_t) dgid;
+ return do_domgrpctl(xc_handle, &domgrpctl);
+}
+
+int xc_domain_group_join(int xc_handle, uint32_t domid, uint32_t dgid)
+{
+ DECLARE_DOMGRPCTL;
+ domgrpctl.cmd = XEN_DOMGRPCTL_joingrp;
+ domgrpctl.u.join_grp.domid = (domid_t) domid;
+ domgrpctl.u.join_grp.dgid = (dgid_t) dgid;
+ return do_domgrpctl(xc_handle, &domgrpctl);
+}
+
+#define TRANSFER_LIST_TO_INFO(list_name) \
+ memcpy(info->list_name, domgrpctl.u.get_grp_info.list_name, \
+ MAX_GROUP_SIZE*sizeof(domid_t));
+
+int xc_domain_group_getinfo(int xc_handle, uint32_t first_dgid,
+ unsigned int max_grps, xc_grpinfo_t * info)
+{
+ unsigned int nr_grps;
+ uint32_t next_dgid = first_dgid;
+ DECLARE_DOMGRPCTL;
+ int rc = 0;
+
+ memset(info, 0, max_grps * sizeof(xc_grpinfo_t));
+
+ for (nr_grps = 0; nr_grps < max_grps; nr_grps++) {
+ domgrpctl.cmd = XEN_DOMGRPCTL_getgrpinfo;
+ domgrpctl.u.get_grp_info.dgid = (dgid_t) next_dgid;
+
+ rc = do_domgrpctl(xc_handle, &domgrpctl);
+ if (rc < 0)
+ break;
+
+ info->dgid = (uint16_t) domgrpctl.u.get_grp_info.dgid;
+ info->size = (uint16_t) domgrpctl.u.get_grp_info.size;
+
+ TRANSFER_LIST_TO_INFO(member_list);
+ memcpy(info->handle, domgrpctl.u.get_grp_info.handle,
+ sizeof(xen_domain_group_handle_t));
+
+ next_dgid = (uint16_t) domgrpctl.u.get_grp_info.dgid + 1;
+ info++;
+ }
+
+ if (!nr_grps)
+ return rc;
+
+ return nr_grps;
+}
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