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intel-iommu: fail MAP notifier without caching mode
Without caching mode, MAP notifier won't work correctly since guest won't send IOTLB update event when it establishes new mappings in the I/O page tables. Let's fail the IOMMU notifiers early instead of misbehaving silently. Reviewed-by: Eric Auger <eric.auger@redhat.com> Tested-by: Viktor Prutyanov <viktor@daynix.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Message-Id: <20230223065924.42503-2-jasowang@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> (cherry picked from commit b8d7827) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
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