/*
* assign a specific cpu to a cpupool
* cpupool_lock must be held
*/
static int cpupool_assign_cpu_locked(struct cpupool *c, unsigned int cpu)
{
int ret;
struct cpupool *old;
struct domain *d;
if ( (cpupool_moving_cpu == cpu) && (c != cpupool_cpu_moving) )
return -EBUSY;
old = per_cpu(cpupool, cpu);
per_cpu(cpupool, cpu) = c;
ret = schedule_cpu_switch(cpu, c);
if ( ret )
{
per_cpu(cpupool, cpu) = old;
return ret;
}
cpumask_clear_cpu(cpu, &cpupool_free_cpus);
if (cpupool_moving_cpu == cpu)
{
cpupool_moving_cpu = -1;
cpupool_put(cpupool_cpu_moving);
cpupool_cpu_moving = NULL;
}
cpumask_set_cpu(cpu, c->cpu_valid);
rcu_read_lock(&domlist_read_lock);
for_each_domain_in_cpupool(d, c)
{
domain_update_node_affinity(d);
}
struct vcpu *alloc_vcpu(
struct domain *d, unsigned int vcpu_id, unsigned int cpu_id)
{
struct vcpu *v;
BUG_ON((!is_idle_domain(d) || vcpu_id) && d->vcpu[vcpu_id]);
if ( (v = alloc_vcpu_struct()) == NULL )
return NULL;
v->domain = d;
v->vcpu_id = vcpu_id;
spin_lock_init(&v->virq_lock);
tasklet_init(&v->continue_hypercall_tasklet, NULL, 0);
if ( !zalloc_cpumask_var(&v->cpu_affinity) ||
!zalloc_cpumask_var(&v->cpu_affinity_tmp) ||
!zalloc_cpumask_var(&v->cpu_affinity_saved) ||
!zalloc_cpumask_var(&v->vcpu_dirty_cpumask) )
goto fail_free;
if ( is_idle_domain(d) )
{
v->runstate.state = RUNSTATE_running;
}
else
{
v->runstate.state = RUNSTATE_offline;
v->runstate.state_entry_time = NOW();
set_bit(_VPF_down, &v->pause_flags);
v->vcpu_info = ((vcpu_id < XEN_LEGACY_MAX_VCPUS)
? (vcpu_info_t *)&shared_info(d, vcpu_info[vcpu_id])
: &dummy_vcpu_info);
v->vcpu_info_mfn = INVALID_MFN;
init_waitqueue_vcpu(v);
}
if ( sched_init_vcpu(v, cpu_id) != 0 )
goto fail_wq;
if ( vcpu_initialise(v) != 0 )
{
sched_destroy_vcpu(v);
fail_wq:
destroy_waitqueue_vcpu(v);
fail_free:
free_cpumask_var(v->cpu_affinity);
free_cpumask_var(v->cpu_affinity_tmp);
free_cpumask_var(v->cpu_affinity_saved);
free_cpumask_var(v->vcpu_dirty_cpumask);
free_vcpu_struct(v);
return NULL;
}
d->vcpu[vcpu_id] = v;
if ( vcpu_id != 0 )
{
int prev_id = v->vcpu_id - 1;
while ( (prev_id >= 0) && (d->vcpu[prev_id] == NULL) )
prev_id--;
BUG_ON(prev_id < 0);
v->next_in_list = d->vcpu[prev_id]->next_in_list;
d->vcpu[prev_id]->next_in_list = v;
}
/* Must be called after making new vcpu visible to for_each_vcpu(). */
vcpu_check_shutdown(v);
domain_update_node_affinity(d);
return v;
}
