KVM: nVMX: correctly set tr base on nested vmexit emulation

After commit 21feb4eb64e21f8dc91136b91ee886b978ce6421 tr base is zeroed
during vmexit. Set it to L1's HOST_TR_BASE. This should fix
https://bugzilla.kernel.org/show_bug.cgi?id=60679

Reported-by: Yongjie Ren <yongjie.ren@intel.com>
Reviewed-by: Arthur Chunqi Li <yzt356@gmail.com>
Tested-by: Yongjie Ren <yongjie.ren@intel.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/vmx.c

@@ -8069,7 +8069,7 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
 	seg.base = vmcs12->host_gs_base;
 	vmx_set_segment(vcpu, &seg, VCPU_SREG_GS);
 	seg = (struct kvm_segment) {
-		.base = 0,
+		.base = vmcs12->host_tr_base,
 		.limit = 0x67,
 		.selector = vmcs12->host_tr_selector,
 		.type = 11,