libxl: make it possible to explicitly specify default sched params

To do so we define a discriminating value which is never a valid real value for
each parameter.

While there:

 - removed libxl_sched_*_domain in favour of libxl_domain_sched_params.
 - use this new functionality for the various xl commands which set sched
   parameters, which saves an explicit read-modify-write in xl.
 - removed call of xc_domain_getinfolist from a few functions which weren't
   actually using the result (looks like a cut and paste error)
 - fix xl which was setting period for a variety of different config keys.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

5 files changed, 142 insertions, 137 deletions

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index d414673558..1b6d178b5a 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -3296,19 +3296,19 @@ libxl_scheduler libxl_get_scheduler(libxl_ctx *ctx)
 }
 
 int libxl_sched_credit_domain_get(libxl_ctx *ctx, uint32_t domid,
-                                  libxl_sched_credit_domain *scinfo)
+                                  libxl_domain_sched_params *scinfo)
 {
     struct xen_domctl_sched_credit sdom;
     int rc;
 
-    libxl_sched_credit_domain_init(scinfo);
-
     rc = xc_sched_credit_domain_get(ctx->xch, domid, &sdom);
     if (rc != 0) {
         LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "getting domain sched credit");
         return ERROR_FAIL;
     }
 
+    libxl_domain_sched_params_init(scinfo);
+    scinfo->sched = LIBXL_SCHEDULER_CREDIT;
     scinfo->weight = sdom.weight;
     scinfo->cap = sdom.cap;
 
@@ -3316,7 +3316,7 @@ int libxl_sched_credit_domain_get(libxl_ctx *ctx, uint32_t domid,
 }
 
 int libxl_sched_credit_domain_set(libxl_ctx *ctx, uint32_t domid,
-                                  libxl_sched_credit_domain *scinfo)
+                                  libxl_domain_sched_params *scinfo)
 {
     struct xen_domctl_sched_credit sdom;
     xc_domaininfo_t domaininfo;
@@ -3330,22 +3330,33 @@ int libxl_sched_credit_domain_set(libxl_ctx *ctx, uint32_t domid,
     if (rc != 1 || domaininfo.domain != domid)
         return ERROR_INVAL;
 
-
-    if (scinfo->weight < 1 || scinfo->weight > 65535) {
-        LIBXL__LOG(ctx, LIBXL__LOG_ERROR,
-            "Cpu weight out of range, valid values are within range from 1 to 65535");
-        return ERROR_INVAL;
+    rc = xc_sched_credit_domain_get(ctx->xch, domid, &sdom);
+    if (rc != 0) {
+        LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "getting domain sched credit");
+        return ERROR_FAIL;
     }
 
-    if (scinfo->cap < 0 || scinfo->cap > (domaininfo.max_vcpu_id + 1) * 100) {
-        LIBXL__LOG(ctx, LIBXL__LOG_ERROR,
-            "Cpu cap out of range, valid range is from 0 to %d for specified number of vcpus",
-            ((domaininfo.max_vcpu_id + 1) * 100));
-        return ERROR_INVAL;
+    if (scinfo->weight != LIBXL_DOMAIN_SCHED_PARAM_WEIGHT_DEFAULT) {
+        if (scinfo->weight < 1 || scinfo->weight > 65535) {
+            LIBXL__LOG(ctx, LIBXL__LOG_ERROR,
+                       "Cpu weight out of range, "
+                       "valid values are within range from 1 to 65535");
+            return ERROR_INVAL;
+        }
+        sdom.weight = scinfo->weight;
     }
 
-    sdom.weight = scinfo->weight;
-    sdom.cap = scinfo->cap;
+    if (scinfo->cap != LIBXL_DOMAIN_SCHED_PARAM_CAP_DEFAULT) {
+        if (scinfo->cap < 0
+            || scinfo->cap > (domaininfo.max_vcpu_id + 1) * 100) {
+            LIBXL__LOG(ctx, LIBXL__LOG_ERROR,
+                "Cpu cap out of range, "
+                "valid range is from 0 to %d for specified number of vcpus",
+                       ((domaininfo.max_vcpu_id + 1) * 100));
+            return ERROR_INVAL;
+        }
+        sdom.cap = scinfo->cap;
+    }
 
     rc = xc_sched_credit_domain_set(ctx->xch, domid, &sdom);
     if ( rc < 0 ) {
@@ -3418,13 +3429,11 @@ int libxl_sched_credit_params_set(libxl_ctx *ctx, uint32_t poolid,
 }
 
 int libxl_sched_credit2_domain_get(libxl_ctx *ctx, uint32_t domid,
-                                   libxl_sched_credit2_domain *scinfo)
+                                   libxl_domain_sched_params *scinfo)
 {
     struct xen_domctl_sched_credit2 sdom;
     int rc;
 
-    libxl_sched_credit2_domain_init(scinfo);
-
     rc = xc_sched_credit2_domain_get(ctx->xch, domid, &sdom);
     if (rc != 0) {
         LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR,
@@ -3432,36 +3441,37 @@ int libxl_sched_credit2_domain_get(libxl_ctx *ctx, uint32_t domid,
         return ERROR_FAIL;
     }
 
+    libxl_domain_sched_params_init(scinfo);
+    scinfo->sched = LIBXL_SCHEDULER_CREDIT2;
     scinfo->weight = sdom.weight;
 
     return 0;
 }
 
 int libxl_sched_credit2_domain_set(libxl_ctx *ctx, uint32_t domid,
-                                   libxl_sched_credit2_domain *scinfo)
+                                   libxl_domain_sched_params *scinfo)
 {
     struct xen_domctl_sched_credit2 sdom;
-    xc_domaininfo_t domaininfo;
     int rc;
 
-    rc = xc_domain_getinfolist(ctx->xch, domid, 1, &domaininfo);
-    if (rc < 0) {
-        LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "getting domain info list");
+    rc = xc_sched_credit2_domain_get(ctx->xch, domid, &sdom);
+    if (rc != 0) {
+        LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR,
+                         "getting domain sched credit2");
         return ERROR_FAIL;
     }
-    if (rc != 1 || domaininfo.domain != domid)
-        return ERROR_INVAL;
-
 
-    if (scinfo->weight < 1 || scinfo->weight > 65535) {
-        LIBXL__LOG_ERRNOVAL(ctx, LIBXL__LOG_ERROR, rc,
-            "Cpu weight out of range, valid values are within range from "
-            "1 to 65535");
-        return ERROR_INVAL;
+    if (scinfo->weight != LIBXL_DOMAIN_SCHED_PARAM_WEIGHT_DEFAULT) {
+        if (scinfo->weight < 1 || scinfo->weight > 65535) {
+            LIBXL__LOG(ctx, LIBXL__LOG_ERROR,
+                       "Cpu weight out of range, "
+                       "valid values are within range from "
+                       "1 to 65535");
+            return ERROR_INVAL;
+        }
+        sdom.weight = scinfo->weight;
     }
 
-    sdom.weight = scinfo->weight;
-
     rc = xc_sched_credit2_domain_set(ctx->xch, domid, &sdom);
     if ( rc < 0 ) {
         LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR,
@@ -3473,7 +3483,7 @@ int libxl_sched_credit2_domain_set(libxl_ctx *ctx, uint32_t domid,
 }
 
 int libxl_sched_sedf_domain_get(libxl_ctx *ctx, uint32_t domid,
-                                libxl_sched_sedf_domain *scinfo)
+                                libxl_domain_sched_params *scinfo)
 {
     uint64_t period;
     uint64_t slice;
@@ -3482,8 +3492,6 @@ int libxl_sched_sedf_domain_get(libxl_ctx *ctx, uint32_t domid,
     uint16_t weight;
     int rc;
 
-    libxl_sched_sedf_domain_init(scinfo);
-
     rc = xc_sedf_domain_get(ctx->xch, domid, &period, &slice, &latency,
                             &extratime, &weight);
     if (rc != 0) {
@@ -3491,6 +3499,8 @@ int libxl_sched_sedf_domain_get(libxl_ctx *ctx, uint32_t domid,
         return ERROR_FAIL;
     }
 
+    libxl_domain_sched_params_init(scinfo);
+    scinfo->sched = LIBXL_SCHEDULER_SEDF;
     scinfo->period = period / 1000000;
     scinfo->slice = slice / 1000000;
     scinfo->latency = latency / 1000000;
@@ -3501,24 +3511,37 @@ int libxl_sched_sedf_domain_get(libxl_ctx *ctx, uint32_t domid,
 }
 
 int libxl_sched_sedf_domain_set(libxl_ctx *ctx, uint32_t domid,
-                                libxl_sched_sedf_domain *scinfo)
+                                libxl_domain_sched_params *scinfo)
 {
-    xc_domaininfo_t domaininfo;
-    int rc;
+    uint64_t period;
+    uint64_t slice;
+    uint64_t latency;
+    uint16_t extratime;
+    uint16_t weight;
 
-    rc = xc_domain_getinfolist(ctx->xch, domid, 1, &domaininfo);
-    if (rc < 0) {
-        LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "getting domain info list");
+    int ret;
+
+    ret = xc_sedf_domain_get(ctx->xch, domid, &period, &slice, &latency,
+                            &extratime, &weight);
+    if (ret != 0) {
+        LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "getting domain sched sedf");
         return ERROR_FAIL;
     }
-    if (rc != 1 || domaininfo.domain != domid)
-        return ERROR_INVAL;
 
+    if (scinfo->period != LIBXL_DOMAIN_SCHED_PARAM_PERIOD_DEFAULT)
+        period = scinfo->period * 1000000;
+    if (scinfo->slice != LIBXL_DOMAIN_SCHED_PARAM_SLICE_DEFAULT)
+        slice = scinfo->slice * 1000000;
+    if (scinfo->latency != LIBXL_DOMAIN_SCHED_PARAM_LATENCY_DEFAULT)
+        latency = scinfo->latency * 1000000;
+    if (scinfo->extratime != LIBXL_DOMAIN_SCHED_PARAM_EXTRATIME_DEFAULT)
+        extratime = scinfo->extratime;
+    if (scinfo->weight != LIBXL_DOMAIN_SCHED_PARAM_WEIGHT_DEFAULT)
+        weight = scinfo->weight;
 
-    rc = xc_sedf_domain_set(ctx->xch, domid, scinfo->period * 1000000,
-                            scinfo->slice * 1000000, scinfo->latency * 1000000,
-                            scinfo->extratime, scinfo->weight);
-    if ( rc < 0 ) {
+    ret = xc_sedf_domain_set(ctx->xch, domid, period, slice, latency,
+                            extratime, weight);
+    if ( ret < 0 ) {
         LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "setting domain sched sedf");
         return ERROR_FAIL;
     }
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index 1e1ffa121c..78fb5afc1a 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -768,23 +768,33 @@ int libxl_set_vcpuonline(libxl_ctx *ctx, uint32_t domid, libxl_cpumap *cpumap);
 
 libxl_scheduler libxl_get_scheduler(libxl_ctx *ctx);
 
-
-int libxl_sched_credit_domain_get(libxl_ctx *ctx, uint32_t domid,
-                                  libxl_sched_credit_domain *scinfo);
-int libxl_sched_credit_domain_set(libxl_ctx *ctx, uint32_t domid,
-                                  libxl_sched_credit_domain *scinfo);
+/* Per-scheduler parameters */
 int libxl_sched_credit_params_get(libxl_ctx *ctx, uint32_t poolid,
                                   libxl_sched_credit_params *scinfo);
 int libxl_sched_credit_params_set(libxl_ctx *ctx, uint32_t poolid,
                                   libxl_sched_credit_params *scinfo);
+
+/* Scheduler Per-domain parameters */
+
+#define LIBXL_DOMAIN_SCHED_PARAM_WEIGHT_DEFAULT    -1
+#define LIBXL_DOMAIN_SCHED_PARAM_CAP_DEFAULT       -1
+#define LIBXL_DOMAIN_SCHED_PARAM_PERIOD_DEFAULT    -1
+#define LIBXL_DOMAIN_SCHED_PARAM_SLICE_DEFAULT     -1
+#define LIBXL_DOMAIN_SCHED_PARAM_LATENCY_DEFAULT   -1
+#define LIBXL_DOMAIN_SCHED_PARAM_EXTRATIME_DEFAULT -1
+
+int libxl_sched_credit_domain_get(libxl_ctx *ctx, uint32_t domid,
+                                  libxl_domain_sched_params *scinfo);
+int libxl_sched_credit_domain_set(libxl_ctx *ctx, uint32_t domid,
+                                  libxl_domain_sched_params *scinfo);
 int libxl_sched_credit2_domain_get(libxl_ctx *ctx, uint32_t domid,
-                                   libxl_sched_credit2_domain *scinfo);
+                                   libxl_domain_sched_params *scinfo);
 int libxl_sched_credit2_domain_set(libxl_ctx *ctx, uint32_t domid,
-                                   libxl_sched_credit2_domain *scinfo);
+                                   libxl_domain_sched_params *scinfo);
 int libxl_sched_sedf_domain_get(libxl_ctx *ctx, uint32_t domid,
-                                libxl_sched_sedf_domain *scinfo);
+                                libxl_domain_sched_params *scinfo);
 int libxl_sched_sedf_domain_set(libxl_ctx *ctx, uint32_t domid,
-                                libxl_sched_sedf_domain *scinfo);
+                                libxl_domain_sched_params *scinfo);
 int libxl_send_trigger(libxl_ctx *ctx, uint32_t domid,
                        libxl_trigger trigger, uint32_t vcpuid);
 int libxl_send_sysrq(libxl_ctx *ctx, uint32_t domid, char sysrq);
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index bbf1af833a..7741c9fdbd 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -45,34 +45,26 @@ libxl_domain_type libxl__domain_type(libxl__gc *gc, uint32_t domid)
 int libxl__sched_set_params(libxl__gc *gc, uint32_t domid,
                             libxl_domain_sched_params *scparams)
 {
-    libxl_ctx *ctx = libxl__gc_owner(gc);
-    libxl_scheduler sched;
-    libxl_sched_sedf_domain sedf_info;
-    libxl_sched_credit_domain credit_info;
-    libxl_sched_credit2_domain credit2_info;
+    libxl_scheduler sched = scparams->sched;
     int ret;
 
-    sched = libxl_get_scheduler (ctx);
+    if (sched == LIBXL_SCHEDULER_UNKNOWN)
+        sched = libxl__domain_scheduler(gc, domid);
+
     switch (sched) {
     case LIBXL_SCHEDULER_SEDF:
-      sedf_info.period = scparams->period;
-      sedf_info.slice = scparams->slice;
-      sedf_info.latency = scparams->latency;
-      sedf_info.extratime = scparams->extratime;
-      sedf_info.weight = scparams->weight;
-      ret=libxl_sched_sedf_domain_set(ctx, domid, &sedf_info);
-      break;
+        ret=libxl_sched_sedf_domain_set(CTX, domid, scparams);
+        break;
     case LIBXL_SCHEDULER_CREDIT:
-      credit_info.weight = scparams->weight;
-      credit_info.cap = scparams->cap;
-      ret=libxl_sched_credit_domain_set(ctx, domid, &credit_info);
-      break;
+        ret=libxl_sched_credit_domain_set(CTX, domid, scparams);
+        break;
     case LIBXL_SCHEDULER_CREDIT2:
-      credit2_info.weight = scparams->weight;
-      ret=libxl_sched_credit2_domain_set(ctx, domid, &credit2_info);
-      break;
+        ret=libxl_sched_credit2_domain_set(CTX, domid, scparams);
+        break;
     default:
-      ret=-1;
+        LOG(ERROR, "Unknown scheduler");
+        ret=ERROR_INVAL;
+        break;
     }
     return ret;
 }
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 053ddc6651..a77bbf722d 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -225,12 +225,13 @@ libxl_domain_create_info = Struct("domain_create_info",[
 MemKB = UInt(64, init_val = "LIBXL_MEMKB_DEFAULT")
 
 libxl_domain_sched_params = Struct("domain_sched_params",[
-    ("weight",       integer),
-    ("cap",          integer),
-    ("period",       integer),
-    ("slice",        integer),
-    ("latency",      integer),
-    ("extratime",    integer),
+    ("sched",        libxl_scheduler),
+    ("weight",       integer, {'init_val': 'LIBXL_DOMAIN_SCHED_PARAM_WEIGHT_DEFAULT'}),
+    ("cap",          integer, {'init_val': 'LIBXL_DOMAIN_SCHED_PARAM_CAP_DEFAULT'}),
+    ("period",       integer, {'init_val': 'LIBXL_DOMAIN_SCHED_PARAM_PERIOD_DEFAULT'}),
+    ("slice",        integer, {'init_val': 'LIBXL_DOMAIN_SCHED_PARAM_SLICE_DEFAULT'}),
+    ("latency",      integer, {'init_val': 'LIBXL_DOMAIN_SCHED_PARAM_LATENCY_DEFAULT'}),
+    ("extratime",    integer, {'init_val': 'LIBXL_DOMAIN_SCHED_PARAM_EXTRATIME_DEFAULT'}),
     ], dir=DIR_IN)
 
 libxl_domain_build_info = Struct("domain_build_info",[
@@ -426,28 +427,11 @@ libxl_cputopology = Struct("cputopology", [
     ("node", uint32),
     ], dir=DIR_OUT)
 
-libxl_sched_credit_domain = Struct("sched_credit_domain", [
-    ("weight", integer),
-    ("cap", integer),
-    ])
-
 libxl_sched_credit_params = Struct("sched_credit_params", [
     ("tslice_ms", integer),
     ("ratelimit_us", integer),
     ], dispose_fn=None)
 
-libxl_sched_credit2_domain = Struct("sched_credit2_domain", [
-    ("weight", integer),
-    ])
-
-libxl_sched_sedf_domain = Struct("sched_sedf_domain", [
-    ("period", integer),
-    ("slice", integer),
-    ("latency", integer),
-    ("extratime", integer),
-    ("weight", integer),
-    ])
-
 libxl_domain_remus_info = Struct("domain_remus_info",[
     ("interval",     integer),
     ("blackhole",    bool),
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index be3661f64d..df0926393f 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -630,7 +630,8 @@ static void parse_config_data(const char *config_source,
     if (blkdev_start)
         b_info->blkdev_start = strdup(blkdev_start);
 
-    /* the following is the actual config parsing with overriding values in the structures */
+    /* the following is the actual config parsing with overriding
+     * values in the structures */
     if (!xlu_cfg_get_long (config, "cpu_weight", &l, 0))
         b_info->sched_params.weight = l;
     if (!xlu_cfg_get_long (config, "cap", &l, 0))
@@ -638,11 +639,11 @@ static void parse_config_data(const char *config_source,
     if (!xlu_cfg_get_long (config, "period", &l, 0))
         b_info->sched_params.period = l;
     if (!xlu_cfg_get_long (config, "slice", &l, 0))
-        b_info->sched_params.period = l;
+        b_info->sched_params.slice = l;
     if (!xlu_cfg_get_long (config, "latency", &l, 0))
-        b_info->sched_params.period = l;
+        b_info->sched_params.latency = l;
     if (!xlu_cfg_get_long (config, "extratime", &l, 0))
-        b_info->sched_params.period = l;
+        b_info->sched_params.extratime = l;
 
     if (!xlu_cfg_get_long (config, "vcpus", &l, 0)) {
         b_info->max_vcpus = l;
@@ -4362,7 +4363,7 @@ int main_sharing(int argc, char **argv)
     return 0;
 }
 
-static int sched_credit_domain_get(int domid, libxl_sched_credit_domain *scinfo)
+static int sched_credit_domain_get(int domid, libxl_domain_sched_params *scinfo)
 {
     int rc;
 
@@ -4373,7 +4374,7 @@ static int sched_credit_domain_get(int domid, libxl_sched_credit_domain *scinfo)
     return rc;
 }
 
-static int sched_credit_domain_set(int domid, libxl_sched_credit_domain *scinfo)
+static int sched_credit_domain_set(int domid, libxl_domain_sched_params *scinfo)
 {
     int rc;
 
@@ -4409,7 +4410,7 @@ static int sched_credit_params_get(int poolid, libxl_sched_credit_params *scinfo
 static int sched_credit_domain_output(int domid)
 {
     char *domname;
-    libxl_sched_credit_domain scinfo;
+    libxl_domain_sched_params scinfo;
     int rc;
 
     if (domid < 0) {
@@ -4426,7 +4427,7 @@ static int sched_credit_domain_output(int domid)
         scinfo.weight,
         scinfo.cap);
     free(domname);
-    libxl_sched_credit_domain_dispose(&scinfo);
+    libxl_domain_sched_params_dispose(&scinfo);
     return 0;
 }
 
@@ -4452,7 +4453,7 @@ static int sched_credit_pool_output(uint32_t poolid)
 }
 
 static int sched_credit2_domain_get(
-    int domid, libxl_sched_credit2_domain *scinfo)
+    int domid, libxl_domain_sched_params *scinfo)
 {
     int rc;
 
@@ -4464,7 +4465,7 @@ static int sched_credit2_domain_get(
 }
 
 static int sched_credit2_domain_set(
-    int domid, libxl_sched_credit2_domain *scinfo)
+    int domid, libxl_domain_sched_params *scinfo)
 {
     int rc;
 
@@ -4479,7 +4480,7 @@ static int sched_credit2_domain_output(
     int domid)
 {
     char *domname;
-    libxl_sched_credit2_domain scinfo;
+    libxl_domain_sched_params scinfo;
     int rc;
 
     if (domid < 0) {
@@ -4495,12 +4496,12 @@ static int sched_credit2_domain_output(
         domid,
         scinfo.weight);
     free(domname);
-    libxl_sched_credit2_domain_dispose(&scinfo);
+    libxl_domain_sched_params_dispose(&scinfo);
     return 0;
 }
 
 static int sched_sedf_domain_get(
-    int domid, libxl_sched_sedf_domain *scinfo)
+    int domid, libxl_domain_sched_params *scinfo)
 {
     int rc;
 
@@ -4512,7 +4513,7 @@ static int sched_sedf_domain_get(
 }
 
 static int sched_sedf_domain_set(
-    int domid, libxl_sched_sedf_domain *scinfo)
+    int domid, libxl_domain_sched_params *scinfo)
 {
     int rc;
 
@@ -4526,7 +4527,7 @@ static int sched_sedf_domain_output(
     int domid)
 {
     char *domname;
-    libxl_sched_sedf_domain scinfo;
+    libxl_domain_sched_params scinfo;
     int rc;
 
     if (domid < 0) {
@@ -4547,7 +4548,7 @@ static int sched_sedf_domain_output(
         scinfo.extratime,
         scinfo.weight);
     free(domname);
-    libxl_sched_sedf_domain_dispose(&scinfo);
+    libxl_domain_sched_params_dispose(&scinfo);
     return 0;
 }
 
@@ -4624,7 +4625,6 @@ static int sched_domain_output(libxl_scheduler sched, int (*output)(int),
  */
 int main_sched_credit(int argc, char **argv)
 {
-    libxl_sched_credit_domain scinfo;
     const char *dom = NULL;
     const char *cpupool = NULL;
     int weight = 256, cap = 0, opt_w = 0, opt_c = 0;
@@ -4699,7 +4699,7 @@ int main_sched_credit(int argc, char **argv)
     }
 
     if (opt_s) {
-        libxl_sched_credit_params  scparam;
+        libxl_sched_credit_params scparam;
         uint32_t poolid = 0;
 
         if (cpupool) {
@@ -4735,20 +4735,19 @@ int main_sched_credit(int argc, char **argv)
     } else {
         find_domain(dom);
 
-        rc = sched_credit_domain_get(domid, &scinfo);
-        if (rc)
-            return -rc;
-
         if (!opt_w && !opt_c) { /* output credit scheduler info */
             sched_credit_domain_output(-1);
             return -sched_credit_domain_output(domid);
         } else { /* set credit scheduler paramaters */
+            libxl_domain_sched_params scinfo;
+            libxl_domain_sched_params_init(&scinfo);
+            scinfo.sched = LIBXL_SCHEDULER_CREDIT;
             if (opt_w)
                 scinfo.weight = weight;
             if (opt_c)
                 scinfo.cap = cap;
             rc = sched_credit_domain_set(domid, &scinfo);
-            libxl_sched_credit_domain_dispose(&scinfo);
+            libxl_domain_sched_params_dispose(&scinfo);
             if (rc)
                 return -rc;
         }
@@ -4759,7 +4758,6 @@ int main_sched_credit(int argc, char **argv)
 
 int main_sched_credit2(int argc, char **argv)
 {
-    libxl_sched_credit2_domain scinfo;
     const char *dom = NULL;
     const char *cpupool = NULL;
     int weight = 256, opt_w = 0;
@@ -4814,18 +4812,17 @@ int main_sched_credit2(int argc, char **argv)
     } else {
         find_domain(dom);
 
-        rc = sched_credit2_domain_get(domid, &scinfo);
-        if (rc)
-            return -rc;
-
         if (!opt_w) { /* output credit2 scheduler info */
             sched_credit2_domain_output(-1);
             return -sched_credit2_domain_output(domid);
         } else { /* set credit2 scheduler paramaters */
+            libxl_domain_sched_params scinfo;
+            libxl_domain_sched_params_init(&scinfo);
+            scinfo.sched = LIBXL_SCHEDULER_CREDIT2;
             if (opt_w)
                 scinfo.weight = weight;
             rc = sched_credit2_domain_set(domid, &scinfo);
-            libxl_sched_credit2_domain_dispose(&scinfo);
+            libxl_domain_sched_params_dispose(&scinfo);
             if (rc)
                 return -rc;
         }
@@ -4836,7 +4833,6 @@ int main_sched_credit2(int argc, char **argv)
 
 int main_sched_sedf(int argc, char **argv)
 {
-    libxl_sched_sedf_domain scinfo;
     const char *dom = NULL;
     const char *cpupool = NULL;
     int period = 0, opt_p = 0;
@@ -4919,15 +4915,15 @@ int main_sched_sedf(int argc, char **argv)
     } else {
         find_domain(dom);
 
-        rc = sched_sedf_domain_get(domid, &scinfo);
-        if (rc)
-            return -rc;
-
         if (!opt_p && !opt_s && !opt_l && !opt_e && !opt_w) {
             /* output sedf scheduler info */
             sched_sedf_domain_output(-1);
             return -sched_sedf_domain_output(domid);
         } else { /* set sedf scheduler paramaters */
+            libxl_domain_sched_params scinfo;
+            libxl_domain_sched_params_init(&scinfo);
+            scinfo.sched = LIBXL_SCHEDULER_SEDF;
+
             if (opt_p) {
                 scinfo.period = period;
                 scinfo.weight = 0;
@@ -4946,7 +4942,7 @@ int main_sched_sedf(int argc, char **argv)
                 scinfo.slice = 0;
             }
             rc = sched_sedf_domain_set(domid, &scinfo);
-            libxl_sched_sedf_domain_dispose(&scinfo);
+            libxl_domain_sched_params_dispose(&scinfo);
             if (rc)
                 return -rc;
         }