Commit d4baf1a9 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Paolo Bonzini
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KVM: x86: hyper-v: Introduce fast guest_hv_cpuid_has_l2_tlb_flush() check 



Introduce a helper to quickly check if KVM needs to handle VMCALL/VMMCALL
from L2 in L0 to process L2 TLB flush requests.

Reviewed-by: default avatarMaxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: default avatarSean Christopherson <seanjc@google.com>
Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Message-Id: <20221101145426.251680-25-vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent c58a318f

arch/x86/kvm/hyperv.h

+8 −0
Original line number Diff line number Diff line
@@ -174,6 +174,14 @@ static inline void kvm_hv_vcpu_purge_flush_tlb(struct kvm_vcpu *vcpu) 
	kfifo_reset_out(&tlb_flush_fifo->entries);

}



static inline bool guest_hv_cpuid_has_l2_tlb_flush(struct kvm_vcpu *vcpu)

{

	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);



	return hv_vcpu &&

		(hv_vcpu->cpuid_cache.nested_eax & HV_X64_NESTED_DIRECT_FLUSH);

}



static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu)

{

	struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);