tcg: reorganize tb_find_physical loop
Put some comments and improve code structure. This should help reading the code. Signed-off-by: NAlex Bennée <alex.bennee@linaro.org> [Sergey Fedorov: provide commit message; bring back resetting of tb_invalidated_flag] Signed-off-by: NSergey Fedorov <sergey.fedorov@linaro.org> Reviewed-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NRichard Henderson <rth@twiddle.net>
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