File 5ac63737-x86-log-XPTI-enabled-status.patch of Package xen.7317

# Commit 442b303cdaf7d774c0be8096fe5dbab68701abd3
# Date 2018-04-05 15:48:23 +0100
# Author Jan Beulich <JBeulich@suse.com>
# Committer Andrew Cooper <andrew.cooper3@citrix.com>
x86: log XPTI enabled status

At the same time also report the state of the two defined
ARCH_CAPABILITIES MSR bits. To avoid further complicating the
conditional around that printk(), drop it (it's a debug level one only
anyway).

Issue the main message without any XENLOG_*, and also drop XENLOG_INFO
from the respective BTI message, to make sure they're visible at default
log level also in release builds.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Tested-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>

--- a/xen/arch/x86/smpboot.c
+++ b/xen/arch/x86/smpboot.c
@@ -739,7 +739,7 @@ static int clone_mapping(const void *ptr
     return 0;
 }
 
-static __read_mostly int8_t opt_xpti = -1;
+int8_t __read_mostly opt_xpti = -1;
 boolean_param("xpti", opt_xpti);
 DEFINE_PER_CPU(root_pgentry_t *, root_pgt);
 
--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -20,6 +20,7 @@
 #include <xen/errno.h>
 #include <xen/lib.h>
 
+#include <asm/msr.h>
 #include <asm/processor.h>
 #include <asm/spec_ctrl.h>
 
@@ -67,31 +68,32 @@ custom_param("bti", parse_bti);
 static void __init print_details(enum ind_thunk thunk)
 {
     unsigned int _7d0 = 0, e8b = 0, tmp;
+    uint64_t caps = 0;
 
     /* Collect diagnostics about available mitigations. */
     if ( boot_cpu_data.cpuid_level >= 7 )
         cpuid_count(7, 0, &tmp, &tmp, &tmp, &_7d0);
     if ( cpuid_eax(0x80000000) >= 0x80000008 )
         cpuid(0x80000008, &tmp, &e8b, &tmp, &tmp);
+    if ( _7d0 & cpufeat_mask(X86_FEATURE_ARCH_CAPS) )
+        rdmsrl(MSR_ARCH_CAPABILITIES, caps);
 
     printk(XENLOG_DEBUG "Speculative mitigation facilities:\n");
 
     /* Hardware features which pertain to speculative mitigations. */
-    if ( (_7d0 & (cpufeat_mask(X86_FEATURE_IBRSB) |
-                  cpufeat_mask(X86_FEATURE_STIBP))) ||
-         (e8b & cpufeat_mask(X86_FEATURE_IBPB)) )
-        printk(XENLOG_DEBUG "  Hardware features:%s%s%s\n",
-               (_7d0 & cpufeat_mask(X86_FEATURE_IBRSB)) ? " IBRS/IBPB" : "",
-               (_7d0 & cpufeat_mask(X86_FEATURE_STIBP)) ? " STIBP"     : "",
-               (e8b  & cpufeat_mask(X86_FEATURE_IBPB))  ? " IBPB"      : "");
+    printk(XENLOG_DEBUG "  Hardware features:%s%s%s%s%s\n",
+           (_7d0 & cpufeat_mask(X86_FEATURE_IBRSB)) ? " IBRS/IBPB" : "",
+           (_7d0 & cpufeat_mask(X86_FEATURE_STIBP)) ? " STIBP"     : "",
+           (e8b  & cpufeat_mask(X86_FEATURE_IBPB))  ? " IBPB"      : "",
+           (caps & ARCH_CAPABILITIES_IBRS_ALL)      ? " IBRS_ALL"  : "",
+           (caps & ARCH_CAPABILITIES_RDCL_NO)       ? " RDCL_NO"   : "");
 
     /* Compiled-in support which pertains to BTI mitigations. */
 #ifdef CONFIG_INDIRECT_THUNK
     printk(XENLOG_DEBUG "  Compiled-in support: INDIRECT_THUNK\n");
 #endif
 
-    printk(XENLOG_INFO
-           "BTI mitigations: Thunk %s, Others:%s%s%s%s\n",
+    printk("BTI mitigations: Thunk %s, Others:%s%s%s%s\n",
            thunk == THUNK_NONE      ? "N/A" :
            thunk == THUNK_RETPOLINE ? "RETPOLINE" : "?",
            default_xen_ibrs > 0     ? " IBRS+" :
@@ -99,6 +101,8 @@ static void __init print_details(enum in
            opt_ibpb                 ? " IBPB"  : "",
            default_xen_rsb & XEN_RSB_NATIVE ? " RSB_NATIVE" : "",
            default_xen_rsb & XEN_RSB_VMEXIT ? " RSB_VMEXIT" : "");
+
+    printk("XPTI: %s\n", opt_xpti ? "enabled" : "disabled");
 }
 
 void __init init_speculation_mitigations(void)
--- a/xen/include/asm-x86/spec_ctrl.h
+++ b/xen/include/asm-x86/spec_ctrl.h
@@ -25,6 +25,7 @@
 
 void init_speculation_mitigations(void);
 
+extern int8_t opt_xpti;
 extern bool_t opt_ibpb;
 extern int8_t default_xen_ibrs;
 extern uint8_t default_xen_rsb;