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The CXL address to device decoding logic is complex because of the need to correctly decode fine grained interleave. The current implementation prevents use with KVM where executed instructions may reside in that memory and gives very slow performance even in TCG. In many real cases non interleaved memory configurations are useful and for those we can use a more conventional memory region alias allowing similar performance to other memory in the system. Whether this fast path is applicable can be established once the full set of HDM decoders has been committed (in whatever order the guest decides to commit them). As such a check is performed on each commit/uncommit of HDM decoder to establish if the alias should be added or removed. Reviewed-by: Li Zhijian <lizhijian@fujitsu.com> Co-developed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Signed-off-by: Jonathan Cameron <jonathan.cameron@huawei.com> Reviewed-by: Gregory Price <gourry@gourry.net> Tested-by: Gregory Price <gourry@gourry.net> Signed-off-by: Alireza Sanaee <alireza.sanaee@huawei.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Message-Id: <20260318171918.146-4-alireza.sanaee@huawei.com>