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Commit 4f2f61fc authored by Wanpeng Li's avatar Wanpeng Li Committed by Paolo Bonzini
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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: default avatarWanpeng Li <wanpengli@tencent.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent afdc3f58

arch/x86/kernel/kvm.c

+4 −2
Original line number Diff line number Diff line
@@ -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));