KVM: X86: Don't use PV TLB flush with dedicated physical CPUs (6beacf74) · Commits · 戴 / test

vCPUs are very unlikely to get preempted when they are the only task running on a CPU. PV TLB flush is slower that the native flush in that case, so disable it. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by:

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

Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:

Radim Krčmář <rkrcmar@redhat.com>

arch/x86/kernel/kvm.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -546,6 +546,7 @@ static void __init kvm_guest_init(void)
		}

		if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
		!kvm_para_has_hint(KVM_HINTS_DEDICATED) &&
		!kvm_para_has_feature(KVM_FEATURE_STEAL_TIME))
		pv_mmu_ops.flush_tlb_others = kvm_flush_tlb_others;

		@@ -640,6 +641,7 @@ static __init int kvm_setup_pv_tlb_flush(void)
		int cpu;

		if (kvm_para_has_feature(KVM_FEATURE_PV_TLB_FLUSH) &&
		!kvm_para_has_hint(KVM_HINTS_DEDICATED) &&
		!kvm_para_has_feature(KVM_FEATURE_STEAL_TIME)) {
		for_each_possible_cpu(cpu) {
		zalloc_cpumask_var_node(per_cpu_ptr(&__pv_tlb_mask, cpu),

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