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, 3 insertions, 2 deletions

diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index 591be0ee1934..d494799aafcd 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -74,14 +74,13 @@ static struct equiv_cpu_entry *equiv_cpu_table;
 static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
 {
         struct cpuinfo_x86 *c = &cpu_data(cpu);
-        u32 dummy;
 
         if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
                 pr_warning("CPU%d: family %d not supported\n", cpu, c->x86);
                 return -1;
         }
 
-        rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy);
+        csig->rev = c->microcode;
         pr_info("CPU%d: patch_level=0x%08x\n", cpu, csig->rev);
 
         return 0;
@@ -130,6 +129,7 @@ static int apply_microcode_amd(int cpu)
         int cpu_num = raw_smp_processor_id();
         struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
         struct microcode_amd *mc_amd = uci->mc;
+        struct cpuinfo_x86 *c = &cpu_data(cpu);
 
         /* We should bind the task to the CPU */
         BUG_ON(cpu_num != cpu);
@@ -150,6 +150,7 @@ static int apply_microcode_amd(int cpu)
 
         pr_info("CPU%d: new patch_level=0x%08x\n", cpu, rev);
         uci->cpu_sig.rev = rev;
+        c->microcode = rev;
 
         return 0;
 }