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Allow userspace to write ID_DFR0_EL1, on the condition that only the PerfMon field can be altered and be something that is compatible with what was computed for the AArch64 view of the guest. Reviewed-by: Reiji Watanabe <reijiw@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20221113163832.3154370-13-maz@kernel.org