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-rw-r--r--Documentation/admin-guide/hw-vuln/spectre.rst22
1 files changed, 9 insertions, 13 deletions
diff --git a/Documentation/admin-guide/hw-vuln/spectre.rst b/Documentation/admin-guide/hw-vuln/spectre.rst
index 9edb2860a..e0a1be97f 100644
--- a/Documentation/admin-guide/hw-vuln/spectre.rst
+++ b/Documentation/admin-guide/hw-vuln/spectre.rst
@@ -439,12 +439,12 @@ 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
- - System is protected from userspace attacks by syscall hardening; KVM is protected by software clearing sequence
+ * - BHI: Vulnerable
+ - System is vulnerable to BHI
+ * - BHI: Vulnerable, KVM: SW loop
+ - System is vulnerable; KVM is protected by software clearing sequence
Full mitigation might require a microcode update from the CPU
vendor. When the necessary microcode is not available, the kernel will
@@ -661,18 +661,14 @@ kernel command line.
spectre_bhi=
[X86] Control mitigation of Branch History Injection
- (BHI) vulnerability. Syscalls are hardened against BHI
- regardless of this setting. This setting affects the deployment
+ (BHI) vulnerability. This setting affects the deployment
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.
- auto
- enable if hardware mitigation
- control(BHI_DIS_S) is available, otherwise
- enable alternate mitigation in KVM.
+ Disable the mitigation.
For spectre_v2_user see Documentation/admin-guide/kernel-parameters.txt