cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

paravirt-spinlocks.c (1038B)

      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}