KVM: X86: Avoid traversing all the cpus for pv tlb flush when steal time is disabled (4f2f61fc) · Commits · 戴 / test

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 KrÄmÃ¡Å™ <rkrcmar@redhat.com> Signed-off-by:

Wanpeng Li <wanpengli@tencent.com> Signed-off-by:

Paolo Bonzini <pbonzini@redhat.com>

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));

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