x86, microcode, AMD: Add microcode revision to /proc/cpuinfo

Enable microcode revision output for AMD after 506ed6b53e00 ("x86,
intel: Output microcode revision in /proc/cpuinfo") did it for Intel.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index b13ed393dfce..d898fab0e125 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -412,6 +412,8 @@ static void __cpuinit early_init_amd_mc(struct cpuinfo_x86 *c)
 
 static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
 {
+        u32 dummy;
+
         early_init_amd_mc(c);
 
         /*
@@ -442,6 +444,8 @@ static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
         }
 #endif
 
+        rdmsr_safe(MSR_AMD64_PATCH_LEVEL, &c->microcode, &dummy);
+
         /* We need to do the following only once */
         if (c != &boot_cpu_data)
                 return;