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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: Lan Tianyu <Tianyu.Lan@microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lan Tianyu 2018-12-06 15:34:36 +08:00 committed by Paolo Bonzini
parent a0d4f80344
commit 53963a70ac
1 changed files with 11 additions and 2 deletions
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13
arch/x86/kvm/vmx/vmx.c
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@ -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: