From: Juergen Gross <jgross@suse.com>
Date: Wed, 2 Oct 2019 07:27:28 +0000 (+0200)
Subject: xen/sched: add support for multiple vcpus per sched unit where missing
X-Git-Tag: temptemp~1299
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=f16c4ced3f1b28b6b452f7a40572a4a093efc6ff;p=people%2Fhx242%2Fxen.git

xen/sched: add support for multiple vcpus per sched unit where missing

In several places there is support for multiple vcpus per sched unit
missing. Add that missing support (with the exception of initial
allocation) and missing helpers for that.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Dario Faggioli <dfaggioli@suse.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
---

diff --git a/xen/common/domain.c b/xen/common/domain.c
index a9882509ed..93aa856bcb 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -1273,7 +1273,10 @@ int vcpu_reset(struct vcpu *v)
     v->async_exception_mask = 0;
     memset(v->async_exception_state, 0, sizeof(v->async_exception_state));
 #endif
-    v->affinity_broken = 0;
+    if ( v->affinity_broken & VCPU_AFFINITY_OVERRIDE )
+        vcpu_temporary_affinity(v, NR_CPUS, VCPU_AFFINITY_OVERRIDE);
+    if ( v->affinity_broken & VCPU_AFFINITY_WAIT )
+        vcpu_temporary_affinity(v, NR_CPUS, VCPU_AFFINITY_WAIT);
     clear_bit(_VPF_blocked, &v->pause_flags);
     clear_bit(_VPF_in_reset, &v->pause_flags);
 
diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index 9c1b044b49..3094ff6838 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -252,8 +252,9 @@ static inline void vcpu_runstate_change(
     s_time_t delta;
     struct sched_unit *unit = v->sched_unit;
 
-    ASSERT(v->runstate.state != new_state);
     ASSERT(spin_is_locked(get_sched_res(v->processor)->schedule_lock));
+    if ( v->runstate.state == new_state )
+        return;
 
     vcpu_urgent_count_update(v);
 
@@ -1729,14 +1730,14 @@ static void sched_switch_units(struct sched_resource *sr,
              (next->vcpu_list->runstate.state == RUNSTATE_runnable) ?
              (now - next->state_entry_time) : 0, prev->next_time);
 
-    ASSERT(prev->vcpu_list->runstate.state == RUNSTATE_running);
+    ASSERT(unit_running(prev));
 
     TRACE_4D(TRC_SCHED_SWITCH, prev->domain->domain_id, prev->unit_id,
              next->domain->domain_id, next->unit_id);
 
     sched_unit_runstate_change(prev, false, now);
 
-    ASSERT(next->vcpu_list->runstate.state != RUNSTATE_running);
+    ASSERT(!unit_running(next));
     sched_unit_runstate_change(next, true, now);
 
     /*
@@ -1858,7 +1859,7 @@ void sched_context_switched(struct vcpu *vprev, struct vcpu *vnext)
             while ( atomic_read(&next->rendezvous_out_cnt) )
                 cpu_relax();
     }
-    else if ( vprev != vnext )
+    else if ( vprev != vnext && sched_granularity == 1 )
         context_saved(vprev);
 }
 
diff --git a/xen/include/xen/sched-if.h b/xen/include/xen/sched-if.h
index 7e568a9d9f..983f2ece83 100644
--- a/xen/include/xen/sched-if.h
+++ b/xen/include/xen/sched-if.h
@@ -81,6 +81,11 @@ static inline bool is_unit_online(const struct sched_unit *unit)
     return false;
 }
 
+static inline unsigned int unit_running(const struct sched_unit *unit)
+{
+    return unit->runstate_cnt[RUNSTATE_running];
+}
+
 /* Returns true if at least one vcpu of the unit is runnable. */
 static inline bool unit_runnable(const struct sched_unit *unit)
 {
@@ -126,7 +131,16 @@ static inline bool unit_runnable_state(const struct sched_unit *unit)
 static inline void sched_set_res(struct sched_unit *unit,
                                  struct sched_resource *res)
 {
-    unit->vcpu_list->processor = res->master_cpu;
+    unsigned int cpu = cpumask_first(res->cpus);
+    struct vcpu *v;
+
+    for_each_sched_unit_vcpu ( unit, v )
+    {
+        ASSERT(cpu < nr_cpu_ids);
+        v->processor = cpu;
+        cpu = cpumask_next(cpu, res->cpus);
+    }
+
     unit->res = res;
 }