diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index 92a14a8492052238a2e8dcd31b356e5a585e277b..7181f62e1406b1f02aa44194897236102a8c5736 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -533,6 +533,70 @@ typedef virTypedParameter *virTypedParameterPtr;
 
 /* Management of scheduler parameters */
 
+/**
+ * VIR_DOMAIN_SCHEDULER_CPU_SHARES:
+ *
+ * Macro represents proportional weight of the scheduler used on the
+ * host cpu, when using the posix scheduler, as a ullong.
+ */
+#define VIR_DOMAIN_SCHEDULER_CPU_SHARES "cpu_shares"
+
+/**
+ * VIR_DOMAIN_SCHEDULER_VCPU_PERIOD:
+ *
+ * Macro represents the enforcement period for a quota, in microseconds,
+ * when using the posix scheduler, as a ullong.
+ */
+#define VIR_DOMAIN_SCHEDULER_VCPU_PERIOD "vcpu_period"
+
+/**
+ * VIR_DOMAIN_SCHEDULER_VCPU_QUOTA:
+ *
+ * Macro represents the maximum bandwidth to be used within a period,
+ * when using the posix scheduler, as an llong.
+ */
+#define VIR_DOMAIN_SCHEDULER_VCPU_QUOTA "vcpu_quota"
+
+/**
+ * VIR_DOMAIN_SCHEDULER_WEIGHT:
+ *
+ * Macro represents the relative weight,  when using the credit
+ * scheduler, as a uint.
+ */
+#define VIR_DOMAIN_SCHEDULER_WEIGHT "weight"
+
+/**
+ * VIR_DOMAIN_SCHEDULER_CAP:
+ *
+ * Macro represents the maximum scheduler cap, when using the credit
+ * scheduler, as a uint.
+ */
+#define VIR_DOMAIN_SCHEDULER_CAP "cap"
+
+/**
+ * VIR_DOMAIN_SCHEDULER_RESERVATION:
+ *
+ * Macro represents the scheduler reservation value, when using the
+ * allocation scheduler, as an llong.
+ */
+#define VIR_DOMAIN_SCHEDULER_RESERVATION "reservation"
+
+/**
+ * VIR_DOMAIN_SCHEDULER_LIMIT:
+ *
+ * Macro represents the scheduler limit value, when using the
+ * allocation scheduler, as an llong.
+ */
+#define VIR_DOMAIN_SCHEDULER_LIMIT "limit"
+
+/**
+ * VIR_DOMAIN_SCHEDULER_SHARES:
+ *
+ * Macro represents the scheduler shares value, when using the
+ * allocation scheduler, as an int.
+ */
+#define VIR_DOMAIN_SCHEDULER_SHARES "shares"
+
 /*
  * Fetch scheduler parameters, caller allocates 'params' field of size 'nparams'
  */
@@ -586,15 +650,16 @@ typedef virDomainBlockStatsStruct *virDomainBlockStatsPtr;
 /**
  * VIR_DOMAIN_BLOCK_STATS_FIELD_LENGTH:
  *
- * Macro providing the field length of virDomainBlockStatsFlagsStruct
+ * Macro providing the field length of parameter names when using
+ * virDomainBlockStatsFlags().
  */
-#define VIR_DOMAIN_BLOCK_STATS_FIELD_LENGTH 80
+#define VIR_DOMAIN_BLOCK_STATS_FIELD_LENGTH VIR_TYPED_PARAM_FIELD_LENGTH
 
 /**
  * VIR_DOMAIN_BLOCK_STATS_READ_BYTES:
  *
  * Macro represents the total number of read bytes of the
- * block device.
+ * block device, as an llong.
  */
 #define VIR_DOMAIN_BLOCK_STATS_READ_BYTES "rd_bytes"
 
@@ -602,7 +667,7 @@ typedef virDomainBlockStatsStruct *virDomainBlockStatsPtr;
  * VIR_DOMAIN_BLOCK_STATS_READ_REQ:
  *
  * Macro represents the total read requests of the
- * block device.
+ * block device, as an llong.
  */
 #define VIR_DOMAIN_BLOCK_STATS_READ_REQ "rd_operations"
 
@@ -610,7 +675,7 @@ typedef virDomainBlockStatsStruct *virDomainBlockStatsPtr;
  * VIR_DOMAIN_BLOCK_STATS_READ_TOTAL_TIMES:
  *
  * Macro represents the total time spend on cache reads in
- * nano-seconds of the block device.
+ * nano-seconds of the block device, as an llong.
  */
 #define VIR_DOMAIN_BLOCK_STATS_READ_TOTAL_TIMES "rd_total_times"
 
@@ -618,7 +683,7 @@ typedef virDomainBlockStatsStruct *virDomainBlockStatsPtr;
  * VIR_DOMAIN_BLOCK_STATS_WRITE_BYTES:
  *
  * Macro represents the total number of write bytes of the
- * block device.
+ * block device, as an llong.
  */
 #define VIR_DOMAIN_BLOCK_STATS_WRITE_BYTES "wr_bytes"
 
@@ -626,7 +691,7 @@ typedef virDomainBlockStatsStruct *virDomainBlockStatsPtr;
  * VIR_DOMAIN_BLOCK_STATS_WRITE_REQ:
  *
  * Macro represents the total write requests of the
- * block device.
+ * block device, as an llong.
  */
 #define VIR_DOMAIN_BLOCK_STATS_WRITE_REQ "wr_operations"
 
@@ -634,7 +699,7 @@ typedef virDomainBlockStatsStruct *virDomainBlockStatsPtr;
  * VIR_DOMAIN_BLOCK_STATS_WRITE_TOTAL_TIMES:
  *
  * Macro represents the total time spend on cache writes in
- * nano-seconds of the block device.
+ * nano-seconds of the block device, as an llong.
  */
 #define VIR_DOMAIN_BLOCK_STATS_WRITE_TOTAL_TIMES "wr_total_times"
 
@@ -642,7 +707,7 @@ typedef virDomainBlockStatsStruct *virDomainBlockStatsPtr;
  * VIR_DOMAIN_BLOCK_STATS_FLUSH_REQ:
  *
  * Macro represents the total flush requests of the
- * block device.
+ * block device, as an llong.
  */
 #define VIR_DOMAIN_BLOCK_STATS_FLUSH_REQ "flush_operations"
 
@@ -650,14 +715,14 @@ typedef virDomainBlockStatsStruct *virDomainBlockStatsPtr;
  * VIR_DOMAIN_BLOCK_STATS_FLUSH_TOTAL_TIMES:
  *
  * Macro represents the total time spend on cache flushing in
- * nano-seconds of the block device.
+ * nano-seconds of the block device, as an llong.
  */
 #define VIR_DOMAIN_BLOCK_STATS_FLUSH_TOTAL_TIMES "flush_total_times"
 
 /**
  * VIR_DOMAIN_BLOCK_STATS_ERRS:
  *
- * In Xen this returns the mysterious 'oo_req'
+ * In Xen this returns the mysterious 'oo_req', as an llong.
  */
 #define VIR_DOMAIN_BLOCK_STATS_ERRS "errs"
 
@@ -1136,7 +1201,7 @@ char *                  virDomainGetSchedulerType(virDomainPtr domain,
  * VIR_DOMAIN_BLKIO_WEIGHT:
  *
  * Macro for the Blkio tunable weight: it represents the io weight
- * the guest can use.
+ * the guest can use, as a uint.
  */
 
 #define VIR_DOMAIN_BLKIO_WEIGHT "weight"
@@ -1163,7 +1228,7 @@ int     virDomainGetBlkioParameters(virDomainPtr domain,
  * VIR_DOMAIN_MEMORY_HARD_LIMIT:
  *
  * Macro for the memory tunable hard_limit: it represents the maximum memory
- * the guest can use.
+ * the guest can use, as a ullong.
  */
 
 #define VIR_DOMAIN_MEMORY_HARD_LIMIT "hard_limit"
@@ -1172,7 +1237,7 @@ int     virDomainGetBlkioParameters(virDomainPtr domain,
  * VIR_DOMAIN_MEMORY_SOFT_LIMIT:
  *
  * Macro for the memory tunable soft_limit: it represents the memory upper
- * limit enforced during memory contention.
+ * limit enforced during memory contention, as a ullong.
  */
 
 #define VIR_DOMAIN_MEMORY_SOFT_LIMIT "soft_limit"
@@ -1181,7 +1246,7 @@ int     virDomainGetBlkioParameters(virDomainPtr domain,
  * VIR_DOMAIN_MEMORY_MIN_GUARANTEE:
  *
  * Macro for the memory tunable min_guarantee: it represents the minimum
- * memory guaranteed to be reserved for the guest.
+ * memory guaranteed to be reserved for the guest, as a ullong.
  */
 
 #define VIR_DOMAIN_MEMORY_MIN_GUARANTEE "min_guarantee"
@@ -1190,7 +1255,7 @@ int     virDomainGetBlkioParameters(virDomainPtr domain,
  * VIR_DOMAIN_MEMORY_SWAP_HARD_LIMIT:
  *
  * Macro for the swap tunable swap_hard_limit: it represents the maximum swap
- * plus memory the guest can use. This limit has to be more than
+ * plus memory the guest can use, as a ullong. This limit has to be more than
  * VIR_DOMAIN_MEMORY_HARD_LIMIT.
  */
 
diff --git a/src/esx/esx_driver.c b/src/esx/esx_driver.c
index dfeef8533239a53f3297b8f6a1b43f7916dfbe96..7cff9c2103a45867f8f5320e7dfc999fc0fd25ff 100644
--- a/src/esx/esx_driver.c
+++ b/src/esx/esx_driver.c
@@ -3661,7 +3661,7 @@ esxDomainGetSchedulerParametersFlags(virDomainPtr domain,
         if (STREQ(dynamicProperty->name, "config.cpuAllocation.reservation") &&
             ! (mask & (1 << 0))) {
             snprintf (params[i].field, VIR_TYPED_PARAM_FIELD_LENGTH, "%s",
-                      "reservation");
+                      VIR_DOMAIN_SCHEDULER_RESERVATION);
 
             params[i].type = VIR_TYPED_PARAM_LLONG;
 
@@ -3677,7 +3677,7 @@ esxDomainGetSchedulerParametersFlags(virDomainPtr domain,
                          "config.cpuAllocation.limit") &&
                    ! (mask & (1 << 1))) {
             snprintf (params[i].field, VIR_TYPED_PARAM_FIELD_LENGTH, "%s",
-                      "limit");
+                      VIR_DOMAIN_SCHEDULER_LIMIT);
 
             params[i].type = VIR_TYPED_PARAM_LLONG;
 
@@ -3693,7 +3693,7 @@ esxDomainGetSchedulerParametersFlags(virDomainPtr domain,
                          "config.cpuAllocation.shares") &&
                    ! (mask & (1 << 2))) {
             snprintf (params[i].field, VIR_TYPED_PARAM_FIELD_LENGTH, "%s",
-                      "shares");
+                      VIR_DOMAIN_SCHEDULER_SHARES);
 
             params[i].type = VIR_TYPED_PARAM_INT;
 
@@ -3783,7 +3783,7 @@ esxDomainSetSchedulerParametersFlags(virDomainPtr domain,
     }
 
     for (i = 0; i < nparams; ++i) {
-        if (STREQ (params[i].field, "reservation") &&
+        if (STREQ (params[i].field, VIR_DOMAIN_SCHEDULER_RESERVATION) &&
             params[i].type == VIR_TYPED_PARAM_LLONG) {
             if (esxVI_Long_Alloc(&spec->cpuAllocation->reservation) < 0) {
                 goto cleanup;
@@ -3797,7 +3797,7 @@ esxDomainSetSchedulerParametersFlags(virDomainPtr domain,
             }
 
             spec->cpuAllocation->reservation->value = params[i].value.l;
-        } else if (STREQ (params[i].field, "limit") &&
+        } else if (STREQ (params[i].field, VIR_DOMAIN_SCHEDULER_LIMIT) &&
                    params[i].type == VIR_TYPED_PARAM_LLONG) {
             if (esxVI_Long_Alloc(&spec->cpuAllocation->limit) < 0) {
                 goto cleanup;
@@ -3812,7 +3812,7 @@ esxDomainSetSchedulerParametersFlags(virDomainPtr domain,
             }
 
             spec->cpuAllocation->limit->value = params[i].value.l;
-        } else if (STREQ (params[i].field, "shares") &&
+        } else if (STREQ (params[i].field, VIR_DOMAIN_SCHEDULER_SHARES) &&
                    params[i].type == VIR_TYPED_PARAM_INT) {
             if (esxVI_SharesInfo_Alloc(&sharesInfo) < 0 ||
                 esxVI_Int_Alloc(&sharesInfo->shares) < 0) {
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index d324632b2b7b36c42c3bceffaa9e32bf93896593..8d3547b92c1c9046e51d845874aac138f9c6eed0 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -3645,17 +3645,20 @@ libxlDomainGetSchedulerParametersFlags(virDomainPtr dom,
 
     params[0].value.ui = sc_info.weight;
     params[0].type = VIR_TYPED_PARAM_UINT;
-    if (virStrcpyStatic(params[0].field, "weight") == NULL) {
+    if (virStrcpyStatic(params[0].field,
+                        VIR_DOMAIN_SCHEDULER_WEIGHT) == NULL) {
         libxlError(VIR_ERR_INTERNAL_ERROR,
-                   "%s", _("Field weight too long for destination"));
+                   _("Field name '%s' too long"),
+                   VIR_DOMAIN_SCHEDULER_WEIGHT);
         goto cleanup;
     }
 
     params[1].value.ui = sc_info.cap;
     params[1].type = VIR_TYPED_PARAM_UINT;
-    if (virStrcpyStatic(params[1].field, "cap") == NULL) {
+    if (virStrcpyStatic(params[1].field, VIR_DOMAIN_SCHEDULER_CAP) == NULL) {
         libxlError(VIR_ERR_INTERNAL_ERROR,
-                   "%s", _("Field cap too long for destination"));
+                   _("Field name '%s' too long"),
+                   VIR_DOMAIN_SCHEDULER_CAP);
         goto cleanup;
     }
 
@@ -3730,7 +3733,7 @@ libxlDomainSetSchedulerParametersFlags(virDomainPtr dom,
     for (i = 0; i < nparams; ++i) {
         virTypedParameterPtr param = &params[i];
 
-        if (STREQ(param->field, "weight")) {
+        if (STREQ(param->field, VIR_DOMAIN_SCHEDULER_WEIGHT)) {
             if (param->type != VIR_TYPED_PARAM_UINT) {
                 libxlError(VIR_ERR_INVALID_ARG, "%s",
                            _("invalid type for weight tunable, expected a 'uint'"));
@@ -3738,7 +3741,7 @@ libxlDomainSetSchedulerParametersFlags(virDomainPtr dom,
             }
             sc_info.weight = params[i].value.ui;
 
-        } else if (STREQ(param->field, "cap")) {
+        } else if (STREQ(param->field, VIR_DOMAIN_SCHEDULER_CAP)) {
             if (param->type != VIR_TYPED_PARAM_UINT) {
                 libxlError(VIR_ERR_INVALID_ARG, "%s",
                            _("invalid type for cap tunable, expected a 'uint'"));
diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index 3af7a300850ae3641a77282729a7b39703a07f1a..9c89c41c12b6f88062138da88bdae3efbefc0fbc 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -2524,7 +2524,7 @@ lxcSetSchedulerParametersFlags(virDomainPtr domain,
     for (i = 0; i < nparams; i++) {
         virTypedParameterPtr param = &params[i];
 
-        if (STRNEQ(param->field, "cpu_shares")) {
+        if (STRNEQ(param->field, VIR_DOMAIN_SCHEDULER_CPU_SHARES)) {
             lxcError(VIR_ERR_INVALID_ARG,
                      _("Invalid parameter `%s'"), param->field);
             goto cleanup;
@@ -2603,7 +2603,8 @@ lxcGetSchedulerParametersFlags(virDomainPtr domain,
     if (virCgroupGetCpuShares(group, &val) != 0)
         goto cleanup;
     params[0].value.ul = val;
-    if (virStrcpyStatic(params[0].field, "cpu_shares") == NULL) {
+    if (virStrcpyStatic(params[0].field,
+                        VIR_DOMAIN_SCHEDULER_CPU_SHARES) == NULL) {
         lxcError(VIR_ERR_INTERNAL_ERROR,
                  "%s", _("Field cpu_shares too big for destination"));
         goto cleanup;
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 3194e6b90c827c7be169e0185f8a1bd9383360c7..5e49ff458b5edf3836322b2eeda29dfe8a7b51ae 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -6297,7 +6297,8 @@ static int qemuDomainSetMemoryParameters(virDomainPtr dom,
             }
         } else if (STREQ(param->field, VIR_DOMAIN_MEMORY_MIN_GUARANTEE)) {
             qemuReportError(VIR_ERR_INVALID_ARG,
-                            _("Memory tunable `%s' not implemented"), param->field);
+                            _("Memory tunable `%s' not implemented"),
+                            param->field);
             ret = -1;
         } else {
             qemuReportError(VIR_ERR_INVALID_ARG,
@@ -6696,7 +6697,7 @@ static int qemuSetSchedulerParametersFlags(virDomainPtr dom,
     for (i = 0; i < nparams; i++) {
         virTypedParameterPtr param = &params[i];
 
-        if (STREQ(param->field, "cpu_shares")) {
+        if (STREQ(param->field, VIR_DOMAIN_SCHEDULER_CPU_SHARES)) {
             if (param->type != VIR_TYPED_PARAM_ULLONG) {
                 qemuReportError(VIR_ERR_INVALID_ARG, "%s",
                                 _("invalid type for cpu_shares tunable, expected a 'ullong'"));
@@ -6717,7 +6718,7 @@ static int qemuSetSchedulerParametersFlags(virDomainPtr dom,
             if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
                 vmdef->cputune.shares = params[i].value.ul;
             }
-        } else if (STREQ(param->field, "vcpu_period")) {
+        } else if (STREQ(param->field, VIR_DOMAIN_SCHEDULER_VCPU_PERIOD)) {
             if (param->type != VIR_TYPED_PARAM_ULLONG) {
                 qemuReportError(VIR_ERR_INVALID_ARG, "%s",
                                 _("invalid type for vcpu_period tunable,"
@@ -6737,7 +6738,7 @@ static int qemuSetSchedulerParametersFlags(virDomainPtr dom,
             if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
                 vmdef->cputune.period = params[i].value.ul;
             }
-        } else if (STREQ(param->field, "vcpu_quota")) {
+        } else if (STREQ(param->field, VIR_DOMAIN_SCHEDULER_VCPU_QUOTA)) {
             if (param->type != VIR_TYPED_PARAM_LLONG) {
                 qemuReportError(VIR_ERR_INVALID_ARG, "%s",
                                 _("invalid type for vcpu_quota tunable,"
@@ -6981,11 +6982,11 @@ qemuGetSchedulerParametersFlags(virDomainPtr dom,
 out:
     params[0].value.ul = shares;
     params[0].type = VIR_TYPED_PARAM_ULLONG;
-    /* XXX make these field names public in libvirt.h */
-    if (virStrcpyStatic(params[0].field, "cpu_shares") == NULL) {
+    if (virStrcpyStatic(params[0].field,
+                        VIR_DOMAIN_SCHEDULER_CPU_SHARES) == NULL) {
         qemuReportError(VIR_ERR_INTERNAL_ERROR,
                         _("Field name '%s' too long"),
-                        "cpu_shares");
+                        VIR_DOMAIN_SCHEDULER_CPU_SHARES);
         goto cleanup;
     }
 
@@ -6995,10 +6996,11 @@ out:
         if (*nparams > saved_nparams) {
             params[1].value.ul = period;
             params[1].type = VIR_TYPED_PARAM_ULLONG;
-            if (virStrcpyStatic(params[1].field, "vcpu_period") == NULL) {
+            if (virStrcpyStatic(params[1].field,
+                                VIR_DOMAIN_SCHEDULER_VCPU_PERIOD) == NULL) {
                 qemuReportError(VIR_ERR_INTERNAL_ERROR,
                                 _("Field name '%s' too long"),
-                                "vcpu_period");
+                                VIR_DOMAIN_SCHEDULER_VCPU_PERIOD);
                 goto cleanup;
             }
             saved_nparams++;
@@ -7007,10 +7009,11 @@ out:
         if (*nparams > saved_nparams) {
             params[2].value.ul = quota;
             params[2].type = VIR_TYPED_PARAM_LLONG;
-            if (virStrcpyStatic(params[2].field, "vcpu_quota") == NULL) {
+            if (virStrcpyStatic(params[2].field,
+                                VIR_DOMAIN_SCHEDULER_VCPU_QUOTA) == NULL) {
                 qemuReportError(VIR_ERR_INTERNAL_ERROR,
                                 _("Field name '%s' too long"),
-                                "vcpu_quota");
+                                VIR_DOMAIN_SCHEDULER_VCPU_QUOTA);
                 goto cleanup;
             }
             saved_nparams++;
diff --git a/src/test/test_driver.c b/src/test/test_driver.c
index 326409da0f3f3d96b16a7c9d1253fc1260f3f08d..4e1973adb69164dfb764ddeb85d4056dcd4e05e5 100644
--- a/src/test/test_driver.c
+++ b/src/test/test_driver.c
@@ -2713,7 +2713,7 @@ testDomainGetSchedulerParamsFlags(virDomainPtr domain,
         testError(VIR_ERR_INVALID_ARG, "%s", _("Invalid parameter count"));
         goto cleanup;
     }
-    strcpy(params[0].field, "weight");
+    strcpy(params[0].field, VIR_DOMAIN_SCHEDULER_WEIGHT);
     params[0].type = VIR_TYPED_PARAM_UINT;
     /* XXX */
     /*params[0].value.ui = privdom->weight;*/
@@ -2759,7 +2759,7 @@ testDomainSetSchedulerParamsFlags(virDomainPtr domain,
     }
 
     for (i = 0; i < nparams; i++) {
-        if (STRNEQ(params[i].field, "weight")) {
+        if (STRNEQ(params[i].field, VIR_DOMAIN_SCHEDULER_WEIGHT)) {
             testError(VIR_ERR_INVALID_ARG, "field");
             goto cleanup;
         }
diff --git a/src/xen/xen_hypervisor.c b/src/xen/xen_hypervisor.c
index 58ae6a3edb35ef3ecadff5c4e0d5aea8b36c2295..f1a8e68bca7c5804dae48c13e69b077027cd07c6 100644
--- a/src/xen/xen_hypervisor.c
+++ b/src/xen/xen_hypervisor.c
@@ -1203,9 +1203,6 @@ xenHypervisorGetSchedulerType(virDomainPtr domain, int *nparams)
     return schedulertype;
 }
 
-static const char *str_weight = "weight";
-static const char *str_cap = "cap";
-
 /**
  * xenHypervisorGetSchedulerParameters:
  * @domain: pointer to the Xen Hypervisor block
@@ -1291,17 +1288,21 @@ xenHypervisorGetSchedulerParameters(virDomainPtr domain,
                 if (ret < 0)
                     return(-1);
 
-                if (virStrcpyStatic(params[0].field, str_weight) == NULL) {
+                if (virStrcpyStatic(params[0].field,
+                                    VIR_DOMAIN_SCHEDULER_WEIGHT) == NULL) {
                     virXenError(VIR_ERR_INTERNAL_ERROR,
-                                "Weight %s too big for destination", str_weight);
+                                "Weight %s too big for destination",
+                                VIR_DOMAIN_SCHEDULER_WEIGHT);
                     return -1;
                 }
                 params[0].type = VIR_TYPED_PARAM_UINT;
                 params[0].value.ui = op_dom.u.getschedinfo.u.credit.weight;
 
-                if (virStrcpyStatic(params[1].field, str_cap) == NULL) {
+                if (virStrcpyStatic(params[1].field,
+                                    VIR_DOMAIN_SCHEDULER_CAP) == NULL) {
                     virXenError(VIR_ERR_INTERNAL_ERROR,
-                                "Cap %s too big for destination", str_cap);
+                                "Cap %s too big for destination",
+                                VIR_DOMAIN_SCHEDULER_CAP);
                     return -1;
                 }
                 params[1].type = VIR_TYPED_PARAM_UINT;
@@ -1402,7 +1403,7 @@ xenHypervisorSetSchedulerParameters(virDomainPtr domain,
 
             for (i = 0; i < nparams; i++) {
                 memset(&buf, 0, sizeof(buf));
-                if (STREQ (params[i].field, str_weight) &&
+                if (STREQ (params[i].field, VIR_DOMAIN_SCHEDULER_WEIGHT) &&
                     params[i].type == VIR_TYPED_PARAM_UINT) {
                     val = params[i].value.ui;
                     if ((val < 1) || (val > USHRT_MAX)) {
@@ -1411,7 +1412,7 @@ xenHypervisorSetSchedulerParameters(virDomainPtr domain,
                         return(-1);
                     }
                     op_dom.u.getschedinfo.u.credit.weight = val;
-                } else if (STREQ (params[i].field, str_cap) &&
+                } else if (STREQ (params[i].field, VIR_DOMAIN_SCHEDULER_CAP) &&
                     params[i].type == VIR_TYPED_PARAM_UINT) {
                     val = params[i].value.ui;
                     if (val >= USHRT_MAX) {
diff --git a/src/xen/xend_internal.c b/src/xen/xend_internal.c
index fa39e8b26d851a2cc1f81ddb6ba008d05ff12e7a..4fcc628970bbe84d454599d86ab4efc71f19a3ed 100644
--- a/src/xen/xend_internal.c
+++ b/src/xen/xend_internal.c
@@ -3554,9 +3554,6 @@ error:
 
 }
 
-static const char *str_weight = "weight";
-static const char *str_cap = "cap";
-
 /**
  * xenDaemonGetSchedulerParameters:
  * @domain: pointer to the Domain block
@@ -3635,18 +3632,21 @@ xenDaemonGetSchedulerParameters(virDomainPtr domain,
                 goto error;
             }
 
-            if (virStrcpyStatic(params[0].field, str_weight) == NULL) {
+            if (virStrcpyStatic(params[0].field,
+                                VIR_DOMAIN_SCHEDULER_WEIGHT) == NULL) {
                 virXendError(VIR_ERR_INTERNAL_ERROR,
                              _("Weight %s too big for destination"),
-                             str_weight);
+                             VIR_DOMAIN_SCHEDULER_WEIGHT);
                 goto error;
             }
             params[0].type = VIR_TYPED_PARAM_UINT;
             params[0].value.ui = sexpr_int(root, "domain/cpu_weight");
 
-            if (virStrcpyStatic(params[1].field, str_cap) == NULL) {
+            if (virStrcpyStatic(params[1].field,
+                                VIR_DOMAIN_SCHEDULER_CAP) == NULL) {
                 virXendError(VIR_ERR_INTERNAL_ERROR,
-                             _("Cap %s too big for destination"), str_cap);
+                             _("Cap %s too big for destination"),
+                             VIR_DOMAIN_SCHEDULER_CAP);
                 goto error;
             }
             params[1].type = VIR_TYPED_PARAM_UINT;
@@ -3727,10 +3727,10 @@ xenDaemonSetSchedulerParameters(virDomainPtr domain,
             memset(&buf_weight, 0, VIR_UUID_BUFLEN);
             memset(&buf_cap, 0, VIR_UUID_BUFLEN);
             for (i = 0; i < nparams; i++) {
-                if (STREQ (params[i].field, str_weight) &&
+                if (STREQ (params[i].field, VIR_DOMAIN_SCHEDULER_WEIGHT) &&
                     params[i].type == VIR_TYPED_PARAM_UINT) {
                     snprintf(buf_weight, sizeof(buf_weight), "%u", params[i].value.ui);
-                } else if (STREQ (params[i].field, str_cap) &&
+                } else if (STREQ (params[i].field, VIR_DOMAIN_SCHEDULER_CAP) &&
                     params[i].type == VIR_TYPED_PARAM_UINT) {
                     snprintf(buf_cap, sizeof(buf_cap), "%u", params[i].value.ui);
                 } else {