Commit 53963a70 authored by Lan Tianyu's avatar Lan Tianyu Committed by Paolo Bonzini
Browse files

KVM/VMX: Check ept_pointer before flushing ept tlb 



This patch is to initialize ept_pointer to INVALID_PAGE and check it
before flushing ept tlb. If ept_pointer is invalid, bypass the flush
request.

Signed-off-by: default avatarLan Tianyu <Tianyu.Lan@microsoft.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent a0d4f803

arch/x86/kvm/vmx/vmx.c

+11 −2
Original line number Diff line number Diff line
@@ -423,11 +423,18 @@ static int vmx_hv_remote_flush_tlb(struct kvm *kvm) 
	/*

	 * FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE hypercall needs the address of the

	 * base of EPT PML4 table, strip off EPT configuration information.

	 * If ept_pointer is invalid pointer, bypass the flush request.

	 */

	if (to_kvm_vmx(kvm)->ept_pointers_match != EPT_POINTERS_MATCH) {

		kvm_for_each_vcpu(i, vcpu, kvm)

		kvm_for_each_vcpu(i, vcpu, kvm) {

			u64 ept_pointer = to_vmx(vcpu)->ept_pointer;



			if (!VALID_PAGE(ept_pointer))

				continue;



			ret |= hyperv_flush_guest_mapping(

				to_vmx(kvm_get_vcpu(kvm, i))->ept_pointer & PAGE_MASK);

				ept_pointer & PAGE_MASK);

		}

	} else {

		ret = hyperv_flush_guest_mapping(

				to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer & PAGE_MASK);
@@ -6433,6 +6440,8 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id) 
	vmx->pi_desc.nv = POSTED_INTR_VECTOR;

	vmx->pi_desc.sn = 1;



	vmx->ept_pointer = INVALID_PAGE;



	return &vmx->vcpu;



free_vmcs:

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