diff options
Diffstat (limited to 'arch/x86/kvm/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index fd6012eef9c9..2ce9da58611e 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -51,7 +51,12 @@ extern bool itlb_multihit_kvm_mitigation; static int __read_mostly nx_huge_pages = -1; +#ifdef CONFIG_PREEMPT_RT +/* Recovery can cause latency spikes, disable it for PREEMPT_RT. */ +static uint __read_mostly nx_huge_pages_recovery_ratio = 0; +#else static uint __read_mostly nx_huge_pages_recovery_ratio = 60; +#endif static int set_nx_huge_pages(const char *val, const struct kernel_param *kp); static int set_nx_huge_pages_recovery_ratio(const char *val, const struct kernel_param *kp); @@ -6280,14 +6285,13 @@ static int set_nx_huge_pages(const char *val, const struct kernel_param *kp) if (new_val != old_val) { struct kvm *kvm; - int idx; mutex_lock(&kvm_lock); list_for_each_entry(kvm, &vm_list, vm_list) { - idx = srcu_read_lock(&kvm->srcu); + mutex_lock(&kvm->slots_lock); kvm_mmu_zap_all_fast(kvm); - srcu_read_unlock(&kvm->srcu, idx); + mutex_unlock(&kvm->slots_lock); wake_up_process(kvm->arch.nx_lpage_recovery_thread); } |
