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Introduce a KVM selftest to check the hypercall interface for arm64 platforms. The test validates the user-space' [GET|SET]_ONE_REG interface to read/write the psuedo-firmware registers as well as its effects on the guest upon certain configurations. Signed-off-by: Raghavendra Rao Ananta <rananta@google.com> Reviewed-by: Gavin Shan <gshan@redhat.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220502233853.1233742-9-rananta@google.com