void l4x_evict_tasks(struct task_struct *exclude)
{
struct task_struct *p;
int cnt = 0;
rcu_read_lock();
for_each_process(p) {
l4_cap_idx_t t;
struct mm_struct *mm;
if (p == exclude)
continue;
task_lock(p);
mm = p->mm;
if (!mm) {
task_unlock(p);
continue;
}
t = ACCESS_ONCE(mm->context.task);
if (l4_is_invalid_cap(t)) {
task_unlock(p);
continue;
}
if (down_read_trylock(&mm->mmap_sem)) {
struct vm_area_struct *vma;
for (vma = mm->mmap; vma; vma = vma->vm_next)
if (vma->vm_flags & VM_LOCKED) {
t = L4_INVALID_CAP;
break;
}
up_read(&mm->mmap_sem);
if (!vma)
if (cmpxchg(&mm->context.task, t, L4_INVALID_CAP) != t)
t = L4_INVALID_CAP;
} else
t = L4_INVALID_CAP;
task_unlock(p);
if (!l4_is_invalid_cap(t)) {
l4lx_task_delete_task(t);
l4lx_task_number_free(t);
if (++cnt > 10)
break;
}
}
rcu_read_unlock();
if (cnt == 0)
pr_info_ratelimited("l4x-evict: Found no process to free.\n");
}
int l4x_kvm_destroy_vm(struct kvm *kvm)
{
printk("%s: cap = %08lx\n", __func__, kvm->arch.l4vmcap);
if (!l4lx_task_delete_task(kvm->arch.l4vmcap, 1)) {
printk("%s: kvm task destruction failed cap=%08lx\n",
__func__, kvm->arch.l4vmcap);
l4lx_task_number_free(kvm->arch.l4vmcap);
return -ENOENT;
}
l4lx_task_number_free(kvm->arch.l4vmcap);
return 0;
}
void destroy_context(struct mm_struct *mm)
{
l4_cap_idx_t task_id;
destroy_context_origarch(mm);
if (!mm || !mm->context.task ||
l4_is_invalid_cap(task_id = mm->context.task))
return;
if (l4lx_task_delete_task(task_id))
do_exit(9);
mm->context.task = L4_INVALID_CAP;
l4lx_task_number_free(task_id);
}
