x86/spectre_v2: Print what options are available.

Orabug: 27477743
CVE: CVE-2017-5715

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>

diff --git a/arch/x86/kernel/cpu/bugs_64.c b/arch/x86/kernel/cpu/bugs_64.c
index dd4581ef6acfbf61d073e4100d999f3944ccfcbe..763ada9dcab0146bb6d14b2b409fde0594e78fbb 100644 (file)
--- a/arch/x86/kernel/cpu/bugs_64.c
+++ b/arch/x86/kernel/cpu/bugs_64.c
@@ -330,6 +330,10 @@ retpoline_auto:
                mode = retp_compiler() ? SPECTRE_V2_RETPOLINE_GENERIC :
                                         SPECTRE_V2_RETPOLINE_MINIMAL;
 
+               pr_info("Options: %s%s\n",
+                       check_ibrs_inuse() ? "IBRS " : "",
+                       retp_compiler() ? "retpoline" : "");
+
                /* IBRS available. Lets see if we are compiled with retpoline. */
                if (check_ibrs_inuse() && !retp_compiler()) {
                        mode = SPECTRE_V2_IBRS;