intel_iommu: fix missing BQL in pt fast path
In vtd_switch_address_space() we did the memory region switch, however it's possible that the caller of it has not taken the BQL at all. Make sure we have it. CC: Paolo Bonzini <pbonzini@redhat.com> CC: Jason Wang <jasowang@redhat.com> CC: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: NPeter Xu <peterx@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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