Index: xm_internal.c
===================================================================
RCS file: /data/cvs/libvirt/src/xm_internal.c,v
retrieving revision 1.47
diff -u -p -r1.47 xm_internal.c
--- xm_internal.c	21 Nov 2007 16:31:30 -0000	1.47
+++ xm_internal.c	27 Nov 2007 12:29:21 -0000
@@ -52,6 +52,9 @@
 #include "buf.h"
 #include "uuid.h"
 
+static int xenXMConfigSetString(virConfPtr conf, const char *setting,
+                                const char *str);
+
 typedef struct xenXMConfCache *xenXMConfCachePtr;
 typedef struct xenXMConfCache {
     time_t refreshedAt;
@@ -101,7 +104,7 @@ struct xenUnifiedDriver xenXMDriver = {
     NULL, /* domainRestore */
     NULL, /* domainCoreDump */
     xenXMDomainSetVcpus, /* domainSetVcpus */
-    NULL, /* domainPinVcpu */
+    xenXMDomainPinVcpu, /* domainPinVcpu */
     NULL, /* domainGetVcpus */
     NULL, /* domainGetMaxVcpus */
     xenXMListDefinedDomains, /* listDefinedDomains */
@@ -1215,6 +1218,84 @@ int xenXMDomainSetVcpus(virDomainPtr dom
     return (0);
 }
 
+/**
+ * xenXMDomainPinVcpu:
+ * @domain: pointer to domain object
+ * @vcpu: virtual CPU number (reserved)
+ * @cpumap: pointer to a bit map of real CPUs (in 8-bit bytes)
+ * @maplen: length of cpumap in bytes
+ *
+ * Set the vcpu affinity in config
+ *
+ * Returns 0 for success; -1 (with errno) on error
+ */
+int xenXMDomainPinVcpu(virDomainPtr domain, unsigned int vcpu,
+                       unsigned char *cpumap, int maplen)
+{
+    const char *filename;
+    xenXMConfCachePtr entry;
+    char *mapstr = NULL;
+    char *ranges = NULL;
+    int alloc_sz = 0;
+    int i, j;
+    int len;
+    int ret = -1;
+
+    if ((domain == NULL) || (domain->conn == NULL) || (domain->name == NULL)
+     || (cpumap == NULL) || (maplen < 1) || (maplen > (int)sizeof(cpumap_t))) {
+        xenXMError((domain ? domain->conn : NULL), VIR_ERR_INVALID_ARG,
+                   __FUNCTION__);
+        return (-1);
+    }
+    if (domain->conn->flags & VIR_CONNECT_RO)
+        return (-1);
+    if (domain->id != -1)
+        return (-1);
+
+    if (!(filename = virHashLookup(nameConfigMap, domain->name)))
+        return (-1);
+    if (!(entry = virHashLookup(configCache, filename)))
+        return (-1);
+
+    /* allocate memory for mapstr */
+    alloc_sz = (maplen * 32);
+    mapstr = malloc(alloc_sz);
+    if (mapstr == NULL)
+        return (-1);
+    memset(mapstr, 0, alloc_sz);
+
+    /* from bit map, build character string of mapped CPU numbers */
+    for (i = 0; i < maplen; i++)
+        for (j = 0; j < 8; j++)
+            if (cpumap[i] & (1 << j)) {
+                len = snprintf(mapstr, alloc_sz, "%s%d,", mapstr, (8 * i) + j);
+                if (len >= alloc_sz)
+                    goto cleanup;
+            }
+    mapstr[strlen(mapstr) - 1] = '\0';
+
+    /* convert the mapstr to a range based string */
+    ranges = virConvertCpuSet(domain->conn, mapstr, 0);
+    if (ranges != NULL) {
+        if (xenXMConfigSetString(entry->conf, "cpus", ranges) < 0)
+            goto cleanup;
+    } else
+        if (xenXMConfigSetString(entry->conf, "cpus", mapstr) < 0)
+            goto cleanup;
+
+    if (virConfWriteFile(entry->filename, entry->conf) < 0)
+        goto cleanup;
+
+    ret = 0;
+
+ cleanup:
+    if(mapstr)
+        free(mapstr);
+    if(ranges)
+        free(ranges);
+    return (ret);
+}
+
 /*
  * Find an inactive domain based on its name
  */
Index: xm_internal.h
===================================================================
RCS file: /data/cvs/libvirt/src/xm_internal.h,v
retrieving revision 1.6
diff -u -p -r1.6 xm_internal.h
--- xm_internal.h	14 Nov 2007 11:40:57 -0000	1.6
+++ xm_internal.h	27 Nov 2007 12:29:21 -0000
@@ -45,6 +45,8 @@ int xenXMDomainSetMemory(virDomainPtr do
 int xenXMDomainSetMaxMemory(virDomainPtr domain, unsigned long memory);
 unsigned long xenXMDomainGetMaxMemory(virDomainPtr domain);
 int xenXMDomainSetVcpus(virDomainPtr domain, unsigned int vcpus);
+int xenXMDomainPinVcpu(virDomainPtr domain, unsigned int vcpu,
+                       unsigned char *cpumap, int maplen);
 virDomainPtr xenXMDomainLookupByName(virConnectPtr conn, const char *domname);
 virDomainPtr xenXMDomainLookupByUUID(virConnectPtr conn,
 				     const unsigned char *uuid);