File 5bb60c12-x86-split-opt_xpti.patch of Package xen.10697

References: bsc#1105528

# Commit 51e0cb45932d80d4eeb59994ee2c3f3c597b0212
# Date 2018-10-04 14:48:18 +0200
# Author Jan Beulich <jbeulich@suse.com>
# Committer Jan Beulich <jbeulich@suse.com>
x86: split opt_xpti

Use separate tracking variables for the hardware domain and DomU-s.

No functional change intended.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -395,8 +395,8 @@ static void set_domain_xpti(struct domai
     }
     else
     {
-        d->arch.pv_domain.xpti = opt_xpti & (is_hardware_domain(d)
-                                             ? OPT_XPTI_DOM0 : OPT_XPTI_DOMU);
+        d->arch.pv_domain.xpti = is_hardware_domain(d) ? opt_xpti_hwdom
+                                                       : opt_xpti_domu;
 
         if ( use_invpcid && cpu_has_pcid )
             switch ( opt_pcid )
--- a/xen/arch/x86/flushtlb.c
+++ b/xen/arch/x86/flushtlb.c
@@ -184,7 +184,7 @@ void flush_area_local(const void *va, un
                  */
                 invpcid_flush_one(PCID_PV_PRIV, addr);
                 invpcid_flush_one(PCID_PV_USER, addr);
-                if ( opt_xpti )
+                if ( opt_xpti_hwdom || opt_xpti_domu )
                 {
                     invpcid_flush_one(PCID_PV_PRIV | PCID_PV_XPTI, addr);
                     invpcid_flush_one(PCID_PV_USER | PCID_PV_XPTI, addr);
--- a/xen/arch/x86/smpboot.c
+++ b/xen/arch/x86/smpboot.c
@@ -766,7 +766,7 @@ static int setup_cpu_root_pgt(unsigned i
     unsigned int off;
     int rc;
 
-    if ( !opt_xpti )
+    if ( !opt_xpti_hwdom && !opt_xpti_domu )
         return 0;
 
     rpt = alloc_xen_pagetable();
--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -99,8 +99,10 @@ static int __init parse_spec_ctrl(char *
 
             opt_eager_fpu = 0;
 
-            if ( opt_xpti < 0 )
-                opt_xpti = 0;
+            if ( opt_xpti_hwdom < 0 )
+                opt_xpti_hwdom = 0;
+            if ( opt_xpti_domu < 0 )
+                opt_xpti_domu = 0;
 
             if ( opt_smt < 0 )
                 opt_smt = 1;
@@ -281,15 +283,16 @@ static void __init print_details(enum in
            opt_eager_fpu                 ? " EAGER_FPU"     : "");
 
     printk("  XPTI (64-bit PV only): Dom0 %s, DomU %s\n",
-           opt_xpti & OPT_XPTI_DOM0 ? "enabled" : "disabled",
-           opt_xpti & OPT_XPTI_DOMU ? "enabled" : "disabled");
+           opt_xpti_hwdom ? "enabled" : "disabled",
+           opt_xpti_domu  ? "enabled" : "disabled");
 
     printk("  PV L1TF shadowing: Dom0 %s, DomU %s\n",
            opt_pv_l1tf & OPT_PV_L1TF_DOM0  ? "enabled"  : "disabled",
            opt_pv_l1tf & OPT_PV_L1TF_DOMU  ? "enabled"  : "disabled");
 }
 
-int8_t __read_mostly opt_xpti = -1;
+int8_t __read_mostly opt_xpti_hwdom = -1;
+int8_t __read_mostly opt_xpti_domu = -1;
 
 static __init void xpti_init_default(uint64_t caps)
 {
@@ -297,9 +300,19 @@ static __init void xpti_init_default(uin
         caps = ARCH_CAPABILITIES_RDCL_NO;
 
     if ( caps & ARCH_CAPABILITIES_RDCL_NO )
-        opt_xpti = 0;
+    {
+        if ( opt_xpti_hwdom < 0 )
+            opt_xpti_hwdom = 0;
+        if ( opt_xpti_domu < 0 )
+            opt_xpti_domu = 0;
+    }
     else
-        opt_xpti = OPT_XPTI_DOM0 | OPT_XPTI_DOMU;
+    {
+        if ( opt_xpti_hwdom < 0 )
+            opt_xpti_hwdom = 1;
+        if ( opt_xpti_domu < 0 )
+            opt_xpti_domu = 1;
+    }
 }
 
 static __init int parse_xpti(char *s)
@@ -308,12 +321,14 @@ static __init int parse_xpti(char *s)
     int val, rc = 0;
 
     /* Inhibit the defaults as an explicit choice has been given. */
-    if ( opt_xpti == -1 )
-        opt_xpti = 0;
+    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 = OPT_XPTI_DOM0 | OPT_XPTI_DOMU;
+        opt_xpti_hwdom = opt_xpti_domu = 1;
 
     do {
         ss = strchr(s, ',');
@@ -323,22 +338,20 @@ static __init int parse_xpti(char *s)
         switch ( parse_bool(s) )
         {
         case 0:
-            opt_xpti = 0;
+            opt_xpti_hwdom = opt_xpti_domu = 0;
             break;
 
         case 1:
-            opt_xpti = OPT_XPTI_DOM0 | OPT_XPTI_DOMU;
+            opt_xpti_hwdom = opt_xpti_domu = 1;
             break;
 
         default:
             if ( !strcmp(s, "default") )
-                opt_xpti = -1;
+                opt_xpti_hwdom = opt_xpti_domu = -1;
             else if ( (val = parse_boolean("dom0", s, ss)) >= 0 )
-                opt_xpti = (opt_xpti & ~OPT_XPTI_DOM0) |
-                           (val ? OPT_XPTI_DOM0 : 0);
+                opt_xpti_hwdom = val;
             else if ( (val = parse_boolean("domu", s, ss)) >= 0 )
-                opt_xpti = (opt_xpti & ~OPT_XPTI_DOMU) |
-                           (val ? OPT_XPTI_DOMU : 0);
+                opt_xpti_domu = val;
             else
                 rc = -EINVAL;
             break;
@@ -647,8 +660,7 @@ void __init init_speculation_mitigations
     /* (Re)init BSP state now that default_xen_* have been calculated. */
     init_shadow_spec_ctrl_state();
 
-    if ( opt_xpti == -1 )
-        xpti_init_default(caps);
+    xpti_init_default(caps);
 
     l1tf_calculations(caps);
 
--- a/xen/include/asm-x86/spec_ctrl.h
+++ b/xen/include/asm-x86/spec_ctrl.h
@@ -35,9 +35,7 @@ extern bool_t bsp_delay_spec_ctrl;
 extern int8_t default_xen_spec_ctrl;
 extern uint8_t default_xen_rsb;
 
-extern int8_t opt_xpti;
-#define OPT_XPTI_DOM0  0x01
-#define OPT_XPTI_DOMU  0x02
+extern int8_t opt_xpti_hwdom, opt_xpti_domu;
 
 extern int8_t opt_pv_l1tf;
 #define OPT_PV_L1TF_DOM0  0x01