[xen stable-4.9] x86: split opt_xpti

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[xen stable-4.9] x86: split opt_xpti

patchbot
commit 273cc99e393c0111c41e5ab8a4d92dc2d0eba374
Author:     Jan Beulich <[hidden email]>
AuthorDate: Mon Nov 5 15:18:25 2018 +0100
Commit:     Jan Beulich <[hidden email]>
CommitDate: Mon Nov 5 15:18:25 2018 +0100

    x86: split opt_xpti
   
    Use separate tracking variables for the hardware domain and DomU-s.
   
    No functional change intended.
   
    Signed-off-by: Jan Beulich <[hidden email]>
    Acked-by: Andrew Cooper <[hidden email]>
    master commit: 51e0cb45932d80d4eeb59994ee2c3f3c597b0212
    master date: 2018-10-04 14:48:18 +0200
---
 xen/arch/x86/domain.c           |  4 ++--
 xen/arch/x86/spec_ctrl.c        | 52 +++++++++++++++++++++++++----------------
 xen/include/asm-x86/spec_ctrl.h |  4 +---
 3 files changed, 35 insertions(+), 25 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 5058c984c3..622422234f 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -731,8 +731,8 @@ int arch_domain_create(struct domain *d, unsigned int domcr_flags,
         /* 64-bit PV guest by default. */
         d->arch.is_32bit_pv = d->arch.has_32bit_shinfo = 0;
 
-        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 ( !is_pv_32bit_domain(d) && use_invpcid && cpu_has_pcid )
             switch ( opt_pcid )
diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c
index 559f2bd806..afa9602580 100644
--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -117,8 +117,10 @@ static int __init parse_spec_ctrl(char *s)
 
             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;
@@ -326,8 +328,8 @@ static void __init print_details(enum ind_thunk thunk, uint64_t caps)
            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",
@@ -640,7 +642,8 @@ static __init void l1tf_calculations(uint64_t caps)
                                             : (3ul << (paddr_bits - 2))));
 }
 
-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)
 {
@@ -648,9 +651,19 @@ static __init void xpti_init_default(uint64_t caps)
         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)
@@ -659,12 +672,14 @@ 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, ',');
@@ -674,22 +689,20 @@ 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 if ( *s )
                 rc = -EINVAL;
             break;
@@ -845,10 +858,9 @@ void __init init_speculation_mitigations(void)
     if ( default_xen_spec_ctrl )
         setup_force_cpu_cap(X86_FEATURE_SC_MSR_IDLE);
 
-    if ( opt_xpti == -1 )
-        xpti_init_default(caps);
+    xpti_init_default(caps);
 
-    if ( opt_xpti == 0 )
+    if ( !opt_xpti_hwdom && !opt_xpti_domu )
         setup_force_cpu_cap(X86_FEATURE_NO_XPTI);
     else
         setup_clear_cpu_cap(X86_FEATURE_NO_XPTI);
diff --git a/xen/include/asm-x86/spec_ctrl.h b/xen/include/asm-x86/spec_ctrl.h
index 8f8aad40bb..1b29f45b1b 100644
--- a/xen/include/asm-x86/spec_ctrl.h
+++ b/xen/include/asm-x86/spec_ctrl.h
@@ -35,9 +35,7 @@ extern bool bsp_delay_spec_ctrl;
 extern uint8_t default_xen_spec_ctrl;
 extern uint8_t default_spec_ctrl_flags;
 
-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
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.9

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