diff options
Diffstat (limited to 'Documentation/admin-guide/hw-vuln/spectre.rst')
| -rw-r--r-- | Documentation/admin-guide/hw-vuln/spectre.rst | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/Documentation/admin-guide/hw-vuln/spectre.rst b/Documentation/admin-guide/hw-vuln/spectre.rst index b70b1d8bd8e657..3cf18e4a1d9ab2 100644 --- a/Documentation/admin-guide/hw-vuln/spectre.rst +++ b/Documentation/admin-guide/hw-vuln/spectre.rst @@ -439,11 +439,11 @@ The possible values in this file are: - System is protected by retpoline * - BHI: BHI_DIS_S - System is protected by BHI_DIS_S - * - BHI: SW loop; KVM SW loop + * - BHI: SW loop, KVM SW loop - System is protected by software clearing sequence * - BHI: Syscall hardening - Syscalls are hardened against BHI - * - BHI: Syscall hardening; KVM: SW loop + * - BHI: Syscall hardening, KVM: SW loop - System is protected from userspace attacks by syscall hardening; KVM is protected by software clearing sequence Full mitigation might require a microcode update from the CPU @@ -666,13 +666,14 @@ kernel command line. of the HW BHI control and the SW BHB clearing sequence. on - unconditionally enable. + (default) Enable the HW or SW mitigation as + needed. off - unconditionally disable. + Disable the mitigation. auto - enable if hardware mitigation - control(BHI_DIS_S) is available, otherwise - enable alternate mitigation in KVM. + Enable the HW mitigation if needed, but + *don't* enable the SW mitigation except for KVM. + The system may be vulnerable. For spectre_v2_user see Documentation/admin-guide/kernel-parameters.txt |