[Xen-devel] [PATCH v2 4/4] x86: support "pv-l1tf=default"

["Jan Beulich" <JBeulich@xxxxxxxx>]

Just like the otherwise similar "xpti=" allows for, to revert back to
built-in defaults.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v2: Split out into separate patch.

--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -1604,7 +1604,7 @@ certain you don't plan on having PV gues
 turning it off can reduce the attack surface.
 
 ### pv-l1tf (x86)
-> `= List of [ <bool>, dom0=<bool>, domu=<bool> ]`
+> `= List of [ default, <bool>, dom0=<bool>, domu=<bool> ]`
 
 > Default: `false` on believed-unaffected hardware, or in pv-shim mode.
 >          `domu`  on believed-affected hardware.
--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -252,7 +252,9 @@ static __init int parse_pv_l1tf(const ch
             break;
 
         default:
-            if ( (val = parse_boolean("dom0", s, ss)) >= 0 )
+            if ( !strcmp(s, "default") )
+                opt_pv_l1tf_hwdom = opt_pv_l1tf_domu = -1;
+            else if ( (val = parse_boolean("dom0", s, ss)) >= 0 )
                 opt_pv_l1tf_hwdom = val;
             else if ( (val = parse_boolean("domu", s, ss)) >= 0 )
                 opt_pv_l1tf_domu = val;





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