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Improve guest tracing #723
Description
The following issue is a follow-up ticket to track some remaining comments from the PR #695
- it would be neat to think about changing the exit ABI so that when tracing is enabled we always bring along a trace structure in some extra registers and can coalesce the exits.
- produce a separate file with call site -> string message mappings, and only record the call site number in the buffer
- check tracing output for expected values
- reconsider the
flushmacro - Unify the hypervisors registers with the
read_trace_reqto not have yet another type that represents registers - Check whether the TraceBuffer generic parameter could be replaced by a closure to improve perf
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