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 
__native_queued_spin_unlock(struct qspinlock * lock)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 
pv_is_native_spin_unlock(void)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 
__native_vcpu_is_preempted(long cpu)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 
pv_is_native_vcpu_is_preempted(void)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 
paravirt_set_cap(void)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 }
44