x86/spec-ctrl: Print all AMD speculative hints/features

We already print Intel features that aren't yet implemented/used, so be
consistent on AMD too.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
(cherry picked from commit 3d189f16a11d5a209fb47fa3635847608d43745c)
[Forward port over XSA-398]

diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c
index be3528c28ebb9217e2967da92ce9b79fb01494e6..0cc9b3fed52c9fb7b3820463fbaa9ca296f2492a 100644 (file)
--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -326,7 +326,7 @@ static void __init print_details(enum ind_thunk thunk, uint64_t caps)
      * Hardware read-only information, stating immunity to certain issues, or
      * suggestions of which mitigation to use.
      */
-    printk("  Hardware hints:%s%s%s%s%s%s%s%s%s%s\n",
+    printk("  Hardware hints:%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
            (caps & ARCH_CAPS_RDCL_NO)                        ? " RDCL_NO"        : "",
            (caps & ARCH_CAPS_IBRS_ALL)                       ? " IBRS_ALL"       : "",
            (caps & ARCH_CAPS_RSBA)                           ? " RSBA"           : "",
@@ -337,16 +337,23 @@ static void __init print_details(enum ind_thunk thunk, uint64_t caps)
            (caps & ARCH_CAPS_TAA_NO)                         ? " TAA_NO"         : "",
            (caps & ARCH_CAPS_SBDR_SSDP_NO)                   ? " SBDR_SSDP_NO"   : "",
            (caps & ARCH_CAPS_FBSDP_NO)                       ? " FBSDP_NO"       : "",
-           (caps & ARCH_CAPS_PSDP_NO)                        ? " PSDP_NO"        : "");
+           (caps & ARCH_CAPS_PSDP_NO)                        ? " PSDP_NO"        : "",
+           (e8b  & cpufeat_mask(X86_FEATURE_IBRS_ALWAYS))    ? " IBRS_ALWAYS"    : "",
+           (e8b  & cpufeat_mask(X86_FEATURE_STIBP_ALWAYS))   ? " STIBP_ALWAYS"   : "",
+           (e8b  & cpufeat_mask(X86_FEATURE_IBRS_FAST))      ? " IBRS_FAST"      : "",
+           (e8b  & cpufeat_mask(X86_FEATURE_IBRS_SAME_MODE)) ? " IBRS_SAME_MODE" : "");
 
     /* Hardware features which need driving to mitigate issues. */
-    printk("  Hardware features:%s%s%s%s%s%s%s%s%s%s%s\n",
+    printk("  Hardware features:%s%s%s%s%s%s%s%s%s%s%s%s\n",
            (e8b  & cpufeat_mask(X86_FEATURE_IBPB)) ||
            (_7d0 & cpufeat_mask(X86_FEATURE_IBRSB))          ? " IBPB"           : "",
+           (e8b  & cpufeat_mask(X86_FEATURE_IBRS)) ||
            (_7d0 & cpufeat_mask(X86_FEATURE_IBRSB))          ? " IBRS"           : "",
+           (e8b  & cpufeat_mask(X86_FEATURE_AMD_STIBP)) ||
            (_7d0 & cpufeat_mask(X86_FEATURE_STIBP))          ? " STIBP"          : "",
            (e8b  & cpufeat_mask(X86_FEATURE_AMD_SSBD)) ||
            (_7d0 & cpufeat_mask(X86_FEATURE_SSBD))           ? " SSBD"           : "",
+           (e8b  & cpufeat_mask(X86_FEATURE_PSFD))           ? " PSFD"           : "",
            (_7d0 & cpufeat_mask(X86_FEATURE_L1D_FLUSH))      ? " L1D_FLUSH"      : "",
            (_7d0 & cpufeat_mask(X86_FEATURE_MD_CLEAR))       ? " MD_CLEAR"       : "",
            (_7d0 & cpufeat_mask(X86_FEATURE_SRBDS_CTRL))     ? " SRBDS_CTRL"     : "",
@@ -367,14 +374,19 @@ static void __init print_details(enum ind_thunk thunk, uint64_t caps)
                "\n");
 
     /* Settings for Xen's protection, irrespective of guests. */
-    printk("  Xen settings: BTI-Thunk %s, SPEC_CTRL: %s%s%s, Other:%s%s%s%s%s\n",
+    printk("  Xen settings: BTI-Thunk %s, SPEC_CTRL: %s%s%s%s, Other:%s%s%s%s%s\n",
            thunk == THUNK_NONE      ? "N/A" :
            thunk == THUNK_RETPOLINE ? "RETPOLINE" :
            thunk == THUNK_LFENCE    ? "LFENCE" :
            thunk == THUNK_JMP       ? "JMP" : "?",
-           !boot_cpu_has(X86_FEATURE_IBRSB)          ? "No" :
+           (!boot_cpu_has(X86_FEATURE_IBRSB) &&
+            !boot_cpu_has(X86_FEATURE_IBRS))         ? "No" :
            (default_xen_spec_ctrl & SPEC_CTRL_IBRS)  ? "IBRS+" :  "IBRS-",
-           !boot_cpu_has(X86_FEATURE_SSBD)           ? "" :
+           (!boot_cpu_has(X86_FEATURE_STIBP) &&
+            !boot_cpu_has(X86_FEATURE_AMD_STIBP))    ? "" :
+           (default_xen_spec_ctrl & SPEC_CTRL_STIBP) ? " STIBP+" : " STIBP-",
+           (!boot_cpu_has(X86_FEATURE_SSBD) &&
+            !boot_cpu_has(X86_FEATURE_AMD_SSBD))     ? "" :
            (default_xen_spec_ctrl & SPEC_CTRL_SSBD)  ? " SSBD+" : " SSBD-",
            !(caps & ARCH_CAPS_TSX_CTRL)              ? "" :
            (opt_tsx & 1)                             ? " TSX+" : " TSX-",