patches/kernel/0274-x86-feature-Report-presence-of-IBPB-and-IBRS-control.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: Tim Chen <tim.c.chen@linux.intel.com>
   3 Date: Wed, 27 Sep 2017 12:09:14 -0700
   4 Subject: [PATCH] x86/feature: Report presence of IBPB and IBRS control
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 CVE-2017-5753
  10 CVE-2017-5715
  11
  12 Report presence of IBPB and IBRS.
  13
  14 Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
  15 Signed-off-by: Andy Whitcroft <apw@canonical.com>
  16 Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
  17 (cherry picked from commit c41156d893e7f48bebf8d71cfddd39d8fb2724f8)
  18 Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
  19 ---
  20  arch/x86/kernel/cpu/intel.c | 5 +++++
  21  1 file changed, 5 insertions(+)
  22
  23 diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
  24 index dfa90a3a5145..f1d94c73625a 100644
  25 --- a/arch/x86/kernel/cpu/intel.c
  26 +++ b/arch/x86/kernel/cpu/intel.c
  27 @@ -627,6 +627,11 @@ static void init_intel(struct cpuinfo_x86 *c)
  28         init_intel_energy_perf(c);
  29
  30         init_intel_misc_features(c);
  31 +
  32 +       if (boot_cpu_has(X86_FEATURE_SPEC_CTRL))
  33 +                printk_once(KERN_INFO "FEATURE SPEC_CTRL Present\n");
  34 +        else
  35 +                printk_once(KERN_INFO "FEATURE SPEC_CTRL Not Present\n");
  36  }
  37
  38  #ifdef CONFIG_X86_32
  39 --
  40 2.14.2
  41