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Implement a log buffer to store log messages. #52

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Implement a log buffer to store log messages. #52

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Commits on Oct 18, 2024

  1. utils: Add a StringRingBuffer implementation 

    The log buffer is implemented using a ring buffer that contains the
characters within log entries. This patch introduces a generic
StringRingBuffer that can be used for safely managing the contents of
strings within a ring buffer that is suitable for use with the log
buffer. This separates the ring buffer implementation from the log and
allows implementation of ring buffer specific unit testing, which is
included within this patch.

Signed-off-by: Vasant Karasulli <[email protected]>
Signed-off-by: Roy Hopkins <[email protected]>
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    vsntk18 committed Oct 18, 2024
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  2. Implement a log buffer which stores all log messages in memory 

    This log buffer is based on the string ring buffer in
utils/StringRingBuffer.

Signed-off-by: Vasant Karasulli <[email protected]>
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    vsntk18 committed Oct 18, 2024
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  3. Implement a percpu line buffer to store the individual log messages 

    Each individual log message gets written into the global log buffer
from the percpu line buffer.

Signed-off-by: Vasant Karasulli <[email protected]>
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    vsntk18 committed Oct 18, 2024
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  4. Initialize log buffer and migrate it from stage2 to svsm kernel 

    Introduce a new struct MigrateInfo which contains the data to
be migrated from stage2 to svsm kernel.

Signed-off-by: Vasant Karasulli <[email protected]>
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    vsntk18 committed Oct 18, 2024
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  5. Add a feature named enable-console-log 

    This feature can be used to enable printing log messages to
console in addition to storing them in the log buffer.

Use ENABLE_CONSOLE_LOG=1 to enable this feature. By default,
this feature is disabled for release builds and enabled for
debug builds.

Signed-off-by: Vasant Karasulli <[email protected]>
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    vsntk18 committed Oct 18, 2024
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  6. log_buffer: add unit tests to test the functionality 

    Test the log_buffer by calling methods like write_log()
and read_log().

Signed-off-by: Vasant Karasulli <[email protected]>
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    vsntk18 committed Oct 18, 2024
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