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guest_owns_fp_regs() will be used to check fpsimd state ownership across kvm/arm64. Therefore, move it to kvm_host.h to widen its scope. Moreover, the host state is not per-vcpu anymore, the vcpu parameter isn't used, so remove it as well. No functional change intended. Signed-off-by: Fuad Tabba <tabba@google.com> Reviewed-by: Mark Brown <broonie@kernel.org> Acked-by: Oliver Upton <oliver.upton@linux.dev> Link: https://lore.kernel.org/r/20240423150538.2103045-3-tabba@google.com Signed-off-by: Marc Zyngier <maz@kernel.org>