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 ee7d5c9..bc1a272 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));