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The KVM CPU hangs if there are not multiple event queues when more than one CPU is created. Since GPUFS primarily relies on the KVM CPU, support for multiple event queues is needed. Some GPU libraries, such as AMD Research's ATMI library, assume more than one CPU. This changeset adds support for multiple CPUs and was tested for up to four CPUs. Change-Id: Ia354e02209d0fa18195f3ad44f4fb1d58e93b5ca Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/65131 Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com> Maintainer: Matt Sinclair <mattdsinclair@gmail.com> Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>