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}
16PV_CALLEE_SAVE_REGS_THUNK(__native_queued_spin_unlock);
17
18bool 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}
28PV_CALLEE_SAVE_REGS_THUNK(__native_vcpu_is_preempted);
29
30bool 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
36void __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}