diff options
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index a3c31b784edc..948707a3615e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2564,15 +2564,14 @@ config MITIGATION_CALL_DEPTH_TRACKING default y help 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. + SKL Return-Stack-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. config CALL_THUNKS_DEBUG bool "Enable call thunks and call depth tracking debugging" |