add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/tools/perf/Documentation/perf-kvm.txt
..
..
@@ -68,10 +68,11 @@
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 -------
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 -i::
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 --input=<path>::
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-        Input file name.
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+        Input file name, for the 'report', 'diff' and 'buildid-list' subcommands.
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 -o::
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 --output=<path>::
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-        Output file name.
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+        Output file name, for the 'record' subcommand. Doesn't work with 'report',
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+        just redirect the output to a file when using 'report'.
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 --host::
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         Collect host side performance profile.
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 --guest::