powerpc/mm/book3s32/kuap.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 #include <asm/kup.h>
   4 #include <asm/smp.h>
   5
   6 struct static_key_false disable_kuap_key;
   7 EXPORT_SYMBOL(disable_kuap_key);
   8
   9 void kuap_lock_all_ool(void)
  10 {
  11         kuap_lock_all();
  12 }
  13 EXPORT_SYMBOL(kuap_lock_all_ool);
  14
  15 void kuap_unlock_all_ool(void)
  16 {
  17         kuap_unlock_all();
  18 }
  19 EXPORT_SYMBOL(kuap_unlock_all_ool);
  20
  21 void setup_kuap(bool disabled)
  22 {
  23         if (!disabled) {
  24                 kuap_lock_all_ool();
  25                 init_mm.context.sr0 |= SR_KS;
  26                 current->thread.sr0 |= SR_KS;
  27         }
  28
  29         if (smp_processor_id() != boot_cpuid)
  30                 return;
  31
  32         if (disabled)
  33                 static_branch_enable(&disable_kuap_key);
  34         else
  35                 pr_info("Activating Kernel Userspace Access Protection\n");
  36 }