libxl: enable per-VCPU extratime flag for RTDS

Modify libxl_vcpu_sched_params_get/set and sched_rtds_vcpu_get/set
functions to support per-VCPU extratime flag

Signed-off-by: Meng Xu <mengxu@cis.upenn.edu>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Dario Faggioli <raistlin@linux.it>

tools/libxl/libxl.h

@@ -256,6 +256,12 @@
  */
 #define LIBXL_HAVE_SCHED_RTDS_VCPU_PARAMS 1
 
+/*
+ * LIBXL_HAVE_SCHED_RTDS_VCPU_EXTRA indicates RTDS scheduler
+ * now supports per-vcpu extratime settings.
+ */
+#define LIBXL_HAVE_SCHED_RTDS_VCPU_EXTRA 1
+
 /*
  * libxl_domain_build_info has the arm.gic_version field.
  */

tools/libxl/libxl_sched.c

@@ -532,6 +532,8 @@ static int sched_rtds_vcpu_get(libxl__gc *gc, uint32_t domid,
     for (i = 0; i < num_vcpus; i++) {
         scinfo->vcpus[i].period = vcpus[i].u.rtds.period;
         scinfo->vcpus[i].budget = vcpus[i].u.rtds.budget;
+        scinfo->vcpus[i].extratime =
+                !!(vcpus[i].u.rtds.flags & XEN_DOMCTL_SCHEDRT_extra);
         scinfo->vcpus[i].vcpuid = vcpus[i].vcpuid;
     }
     rc = 0;
@@ -579,6 +581,8 @@ static int sched_rtds_vcpu_get_all(libxl__gc *gc, uint32_t domid,
     for (i = 0; i < num_vcpus; i++) {
         scinfo->vcpus[i].period = vcpus[i].u.rtds.period;
         scinfo->vcpus[i].budget = vcpus[i].u.rtds.budget;
+        scinfo->vcpus[i].extratime =
+                !!(vcpus[i].u.rtds.flags & XEN_DOMCTL_SCHEDRT_extra);
         scinfo->vcpus[i].vcpuid = vcpus[i].vcpuid;
     }
     rc = 0;
@@ -628,6 +632,10 @@ static int sched_rtds_vcpu_set(libxl__gc *gc, uint32_t domid,
         vcpus[i].vcpuid = scinfo->vcpus[i].vcpuid;
         vcpus[i].u.rtds.period = scinfo->vcpus[i].period;
         vcpus[i].u.rtds.budget = scinfo->vcpus[i].budget;
+        if (scinfo->vcpus[i].extratime)
+            vcpus[i].u.rtds.flags |= XEN_DOMCTL_SCHEDRT_extra;
+        else
+            vcpus[i].u.rtds.flags &= ~XEN_DOMCTL_SCHEDRT_extra;
     }
 
     r = xc_sched_rtds_vcpu_set(CTX->xch, domid,
@@ -676,6 +684,10 @@ static int sched_rtds_vcpu_set_all(libxl__gc *gc, uint32_t domid,
         vcpus[i].vcpuid = i;
         vcpus[i].u.rtds.period = scinfo->vcpus[0].period;
         vcpus[i].u.rtds.budget = scinfo->vcpus[0].budget;
+        if (scinfo->vcpus[0].extratime)
+            vcpus[i].u.rtds.flags |= XEN_DOMCTL_SCHEDRT_extra;
+        else
+            vcpus[i].u.rtds.flags &= ~XEN_DOMCTL_SCHEDRT_extra;
     }
 
     r = xc_sched_rtds_vcpu_set(CTX->xch, domid,
@@ -726,6 +738,11 @@ static int sched_rtds_domain_set(libxl__gc *gc, uint32_t domid,
         sdom.period = scinfo->period;
     if (scinfo->budget != LIBXL_DOMAIN_SCHED_PARAM_BUDGET_DEFAULT)
         sdom.budget = scinfo->budget;
+    /* Set extratime by default */
+    if (scinfo->extratime)
+        sdom.flags |= XEN_DOMCTL_SCHEDRT_extra;
+    else
+        sdom.flags &= ~XEN_DOMCTL_SCHEDRT_extra;
     if (sched_rtds_validate_params(gc, sdom.period, sdom.budget))
         return ERROR_INVAL;
 

tools/libxl/libxl_types.idl

@@ -421,14 +421,14 @@ libxl_domain_sched_params = Struct("domain_sched_params",[
     ("cap",          integer, {'init_val': 'LIBXL_DOMAIN_SCHED_PARAM_CAP_DEFAULT'}),
     ("period",       integer, {'init_val': 'LIBXL_DOMAIN_SCHED_PARAM_PERIOD_DEFAULT'}),
     ("budget",       integer, {'init_val': 'LIBXL_DOMAIN_SCHED_PARAM_BUDGET_DEFAULT'}),
+    ("extratime",    integer, {'init_val': 'LIBXL_DOMAIN_SCHED_PARAM_EXTRATIME_DEFAULT'}),
 
-    # The following three parameters ('slice', 'latency' and 'extratime') are deprecated,
+    # The following three parameters ('slice' and 'latency') are deprecated,
     # and will have no effect if used, since the SEDF scheduler has been removed.
-    # Note that 'period' was an SDF parameter too, but it is still effective as it is
-    # now used (together with 'budget') by the RTDS scheduler.
+    # Note that 'period' and 'extratime' was an SDF parameter too, but it is still effective
+    # as they are now used (together with 'budget') by the RTDS scheduler.
     ("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'}),
     ])
 
 libxl_vnode_info = Struct("vnode_info", [