KVM: MMU: Initialize base_role for tdp mmus

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index ea6063d..b77a5ba 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2885,6 +2885,7 @@
 {
 	struct kvm_mmu *context = vcpu->arch.walk_mmu;
 
+	context->base_role.word = 0;
 	context->new_cr3 = nonpaging_new_cr3;
 	context->page_fault = tdp_page_fault;
 	context->free = nonpaging_free;