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| author |   Liu Song <liusong@linux.alibaba.com> | 2022-08-26 19:40:50 +0800 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2022-09-09 19:02:22 +0100 |
| commit | 877ace9eab7de032f954533afd5d1ecd0cf62eaf (patch) | |
| tree | 8bf06a8f23f1aeb42a3f1a2c1867d22b5da34466 /Documentation/admin-guide | |
| parent | arm64: run softirqs on the per-CPU IRQ stack (diff) | |
| download | linux-dev-877ace9eab7de032f954533afd5d1ecd0cf62eaf.tar.xz linux-dev-877ace9eab7de032f954533afd5d1ecd0cf62eaf.zip | |
arm64: spectre: increase parameters that can be used to turn off bhb mitigation individually
In our environment, it was found that the mitigation BHB has a great
impact on the benchmark performance. For example, in the lmbench test,
the "process fork && exit" test performance drops by 20%.
So it is necessary to have the ability to turn off the mitigation
individually through cmdline, thus avoiding having to compile the
kernel by adjusting the config.
Signed-off-by: Liu Song <liusong@linux.alibaba.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/1661514050-22263-1-git-send-email-liusong@linux.alibaba.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 426fa892d311..a1e88e90e94f 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3207,6 +3207,7 @@ spectre_v2_user=off [X86] spec_store_bypass_disable=off [X86,PPC] ssbd=force-off [ARM64] + nospectre_bhb [ARM64] l1tf=off [X86] mds=off [X86] tsx_async_abort=off [X86] @@ -3631,6 +3632,10 @@ vulnerability. System may allow data leaks with this option. + nospectre_bhb [ARM64] Disable all mitigations for Spectre-BHB (branch + history injection) vulnerability. System may allow data leaks + with this option. + nospec_store_bypass_disable [HW] Disable all mitigations for the Speculative Store Bypass vulnerability |