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Test that the guest can't write 0 to PERF_CAPABILITIES, can't write the current value, and can't toggle _any_ bits. There is no reason to special case the LBR format. Link: https://lore.kernel.org/r/20230311004618.920745-17-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>