[PATCH v2 3/4] x86: fix "xpti=" and "pv-l1tf=" yet again

["Jan Beulich" <JBeulich@suse.com>]

While commit 2a3b34ec47 ("x86/spec-ctrl: Yet more fixes for xpti=
parsing") indeed fixed "xpti=dom0", it broke "xpti=no-dom0", in that
this then became equivalent to "xpti=no". In particular, the presence
of "xpti=" alone on the command line means nothing as to which default
is to be overridden; "xpti=no-dom0", for example, ought to have no
effect for DomU-s, as this is distinct from both "xpti=no-dom0,domu"
and "xpti=no-dom0,no-domu".

Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
v2: Fix copy-and-paste mistake in parse_pv_l1tf(). Split off log message
    silencing. Re-base over patches splitting opt_{xpti,pv_l1tf}.

--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -232,12 +232,6 @@ static __init int parse_pv_l1tf(const ch
     const char *ss;
     int val, rc = 0;
 
-    /* Inhibit the defaults as an explicit choice has been given. */
-    if ( opt_pv_l1tf_hwdom == -1 )
-        opt_pv_l1tf_hwdom = 0;
-    if ( opt_pv_l1tf_domu == -1 )
-        opt_pv_l1tf_domu = 0;
-
     /* Interpret 'pv-l1tf' alone in its positive boolean form. */
     if ( *s == '\0' )
         opt_pv_l1tf_hwdom = opt_pv_l1tf_domu = 1;
@@ -699,12 +693,6 @@ static __init int parse_xpti(const char
     const char *ss;
     int val, rc = 0;
 
-    /* Inhibit the defaults as an explicit choice has been given. */
-    if ( opt_xpti_hwdom == -1 )
-        opt_xpti_hwdom = 0;
-    if ( opt_xpti_domu == -1 )
-        opt_xpti_domu = 0;
-
     /* Interpret 'xpti' alone in its positive boolean form. */
     if ( *s == '\0' )
         opt_xpti_hwdom = opt_xpti_domu = 1;





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