Commit af9d544a authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Sean Christopherson
Browse files

KVM: x86: Introduce helper to handle Hyper-V paravirt TLB flush requests 



As a preparation to making Hyper-V emulation optional, introduce a helper
to handle pending KVM_REQ_HV_TLB_FLUSH requests.

No functional change intended.

Reviewed-by: default avatarMaxim Levitsky <mlevitsk@redhat.com>
Tested-by: default avatarJeremi Piotrowski <jpiotrowski@linux.microsoft.com>
Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20231205103630.1391318-8-vkuznets@redhat.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent e7ad84db

arch/x86/kvm/hyperv.h

+13 −0
Original line number Diff line number Diff line
@@ -247,6 +247,19 @@ static inline int kvm_hv_verify_vp_assist(struct kvm_vcpu *vcpu) 
	return kvm_hv_get_assist_page(vcpu);

}



static inline void kvm_hv_nested_transtion_tlb_flush(struct kvm_vcpu *vcpu,

						     bool tdp_enabled)

{

	/*

	 * KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or

	 * L2's VP_ID upon request from the guest. Make sure we check for

	 * pending entries in the right FIFO upon L1/L2 transition as these

	 * requests are put by other vCPUs asynchronously.

	 */

	if (to_hv_vcpu(vcpu) && tdp_enabled)

		kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu);

}



int kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu);



#endif

arch/x86/kvm/svm/nested.c

+2 −8
Original line number Diff line number Diff line
@@ -487,14 +487,8 @@ static void nested_save_pending_event_to_vmcb12(struct vcpu_svm *svm, 


static void nested_svm_transition_tlb_flush(struct kvm_vcpu *vcpu)

{

	/*

	 * KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or

	 * L2's VP_ID upon request from the guest. Make sure we check for

	 * pending entries in the right FIFO upon L1/L2 transition as these

	 * requests are put by other vCPUs asynchronously.

	 */

	if (to_hv_vcpu(vcpu) && npt_enabled)

		kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu);

	/* Handle pending Hyper-V TLB flush requests */

	kvm_hv_nested_transtion_tlb_flush(vcpu, npt_enabled);



	/*

	 * TODO: optimize unconditional TLB flush/MMU sync.  A partial list of

arch/x86/kvm/vmx/nested.c

+2 −8
Original line number Diff line number Diff line
@@ -1139,14 +1139,8 @@ static void nested_vmx_transition_tlb_flush(struct kvm_vcpu *vcpu, 
{

	struct vcpu_vmx *vmx = to_vmx(vcpu);



	/*

	 * KVM_REQ_HV_TLB_FLUSH flushes entries from either L1's VP_ID or

	 * L2's VP_ID upon request from the guest. Make sure we check for

	 * pending entries in the right FIFO upon L1/L2 transition as these

	 * requests are put by other vCPUs asynchronously.

	 */

	if (to_hv_vcpu(vcpu) && enable_ept)

		kvm_make_request(KVM_REQ_HV_TLB_FLUSH, vcpu);

	/* Handle pending Hyper-V TLB flush requests */

	kvm_hv_nested_transtion_tlb_flush(vcpu, enable_ept);



	/*

	 * If vmcs12 doesn't use VPID, L1 expects linear and combined mappings