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QEMU SMMUv3 currently reports no SubstreamID support, forcing SSID to zero. This prevents accelerated use cases such as Shared Virtual Addressing (SVA), which require multiple Stage-1 context descriptors indexed by SubstreamID. Add a new "ssidsize" property to explicitly configure the number of bits used for SubstreamIDs. A value greater than zero enables SubstreamID support and advertises PASID capability to the vIOMMU. The requested SSIDSIZE is validated against host SMMUv3 capabilities and is only supported when accel=on. Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Nicolin Chen <nicolinc@nvidia.com> Tested-by: Eric Auger <eric.auger@redhat.com> Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org> Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com> Message-id: 20260126104342.253965-38-skolothumtho@nvidia.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>