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The Linux kernel configuration item CONFIG_MITIGATION_CALL_DEPTH_TRACKING
:
CONFIG_CPU_SUP_INTEL && CONFIG_HAVE_CALL_THUNKS
Compile the kernel with call depth tracking to mitigate the Intel SKL Return-Speculation-Buffer (RSB) underflow issue. The mitigation is off by default and needs to be enabled on the kernel command line via the retbleed=stuff option. For non-affected systems the overhead of this option is marginal as the call depth tracking is using run-time generated call thunks in a compiler generated padding area and call patching. This increases text size by ~5%. For non affected systems this space is unused. On affected SKL systems this results in a significant performance gain over the IBRS mitigation.
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