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

[Borislav Petkov]

From: Emanuel Czirai <icanrealizeum@xxxxxxxxx>

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 in that case. It is simple enough.

Signed-off-by: Emanuel Czirai <icanrealizeum@xxxxxxxxx>
Cc: Yaowu Xu <yaowu@xxxxxxxxxx>
[ Write commit message. ]
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
---
 arch/x86/kernel/cpu/amd.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index f5c69d8974e1..eaf938e9df88 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -669,6 +669,14 @@ static void init_amd_gh(struct cpuinfo_x86 *c)
 		set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH);
 }
 
+static void init_amd_ln(struct cpuinfo_x86 *c)
+{
+#define MSR_AMD64_DE_CFG		0xC0011029
+
+	/* Apply erratum 665 fix to machines without a BIOS fix.  */
+	msr_set_bit(MSR_AMD64_DE_CFG, 31);
+}
+
 static void init_amd_bd(struct cpuinfo_x86 *c)
 {
 	u64 value;
@@ -726,6 +734,7 @@ 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;
 	}
 
-- 
2.8.4