KVM: X86: Avoid traversing all the cpus for pv tlb flush when steal time is disabled

Avoid traversing all the cpus for pv tlb flush when steal time
is disabled since pv tlb flush depends on the field in steal time
for shared data.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim KrÄmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index ee7d5c951864a1554cf44459b5fb1d6a3e27a557..bc1a27280c4bf77899afad4b85bf53212d385cab 100644 (file)
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -545,7 +545,8 @@ static void __init kvm_guest_init(void)
                pv_time_ops.steal_clock = kvm_steal_clock;
        }
 
-       if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH))
+       if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
+           !kvm_para_has_feature(KVM_FEATURE_STEAL_TIME))
                pv_mmu_ops.flush_tlb_others = kvm_flush_tlb_others;
 
        if (kvm_para_has_feature(KVM_FEATURE_PV_EOI))
@@ -633,7 +634,8 @@ static __init int kvm_setup_pv_tlb_flush(void)
 {
        int cpu;
 
-       if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH)) {
+       if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
+           !kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
                for_each_possible_cpu(cpu) {
                        zalloc_cpumask_var_node(per_cpu_ptr(&__pv_tlb_mask, cpu),
                                GFP_KERNEL, cpu_to_node(cpu));