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-rw-r--r--docs/misc/xen-command-line.markdown10
1 files changed, 10 insertions, 0 deletions
diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown
index 1f3faaa6de..7ceaa3b555 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -126,6 +126,16 @@ Override Xen's logic for choosing the APIC driver. By default, if
there are more than 8 CPUs, Xen will switch to `bigsmp` over
`default`.
+### allow\_unsafe
+> `= <boolean>`
+
+Force boot on potentially unsafe systems. By default Xen will refuse to boot on
+systems with the following errata:
+
+* AMD Erratum 121. Processors with this erratum are subject to a guest
+ triggerable Denial of Service. Override only if you trust all of your PV
+ guests.
+
### apic\_verbosity
> `= verbose | debug`