x86/AMD: Apply erratum 665 on machines without a BIOS fix

[ Upstream commit d1992996753132e2dafe955cccb2fb0714d3cfc4 ]

AMD F12h machines have an erratum which can cause DIV/IDIV to behave
unpredictably. The workaround is to set MSRC001_1029[31] but sometimes
there is no BIOS update containing that workaround so let's do it
ourselves unconditionally. It is simple enough.

[ Borislav: Wrote commit message. ]

Signed-off-by: Emanuel Czirai <icanrealizeum@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Yaowu Xu <yaowu@google.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20160902053550.18097-1-bp@alien8.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 813d29d00a175cccecc0d673b1f94a817addbbd7..a86afc3741dcef035f7865b204b2975afd89685d 100644 (file)
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -603,6 +603,17 @@ static void init_amd_gh(struct cpuinfo_x86 *c)
                set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH);
 }
 
+#define MSR_AMD64_DE_CFG       0xC0011029
+
+static void init_amd_ln(struct cpuinfo_x86 *c)
+{
+       /*
+        * Apply erratum 665 fix unconditionally so machines without a BIOS
+        * fix work.
+        */
+       msr_set_bit(MSR_AMD64_DE_CFG, 31);
+}
+
 static void init_amd_bd(struct cpuinfo_x86 *c)
 {
        u64 value;
@@ -672,6 +683,7 @@ static void init_amd(struct cpuinfo_x86 *c)
        case 6:    init_amd_k7(c); break;
        case 0xf:  init_amd_k8(c); break;
        case 0x10: init_amd_gh(c); break;
+       case 0x12: init_amd_ln(c); break;
        case 0x15: init_amd_bd(c); break;
        }