arch/x86/kernel/paravirt-spinlocks.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Split spinlock implementation out into its own file, so it can be
   4  * compiled in a FTRACE-compatible way.
   5  */
   6 #include <linux/spinlock.h>
   7 #include <linux/export.h>
   8 #include <linux/jump_label.h>
   9
  10 #include <asm/paravirt.h>
  11
  12 __visible void __native_queued_spin_unlock(struct qspinlock *lock)
  13 {
  14         native_queued_spin_unlock(lock);
  15 }
  16 PV_CALLEE_SAVE_REGS_THUNK(__native_queued_spin_unlock);
  17
  18 bool pv_is_native_spin_unlock(void)
  19 {
  20         return pv_ops.lock.queued_spin_unlock.func ==
  21                 __raw_callee_save___native_queued_spin_unlock;
  22 }
  23
  24 __visible bool __native_vcpu_is_preempted(long cpu)
  25 {
  26         return false;
  27 }
  28 PV_CALLEE_SAVE_REGS_THUNK(__native_vcpu_is_preempted);
  29
  30 bool pv_is_native_vcpu_is_preempted(void)
  31 {
  32         return pv_ops.lock.vcpu_is_preempted.func ==
  33                 __raw_callee_save___native_vcpu_is_preempted;
  34 }
  35
  36 void __init paravirt_set_cap(void)
  37 {
  38         if (!pv_is_native_spin_unlock())
  39                 setup_force_cpu_cap(X86_FEATURE_PVUNLOCK);
  40
  41         if (!pv_is_native_vcpu_is_preempted())
  42                 setup_force_cpu_cap(X86_FEATURE_VCPUPREEMPT);
  43 }