diff --git a/xen/arch/x86/cpu/mwait-idle.c b/xen/arch/x86/cpu/mwait-idle.c
index 9e193155ca..6e65e38ea3 100644
--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -574,6 +574,22 @@ static const struct cpuidle_state avn_cstates[] = {
 	{}
 };
 
+static const struct cpuidle_state knl_cstates[] = {
+	{
+		.name = "C1-KNL",
+		.flags = MWAIT2flg(0x00),
+		.exit_latency = 1,
+		.target_residency = 2,
+	},
+	{
+		.name = "C6-KNL",
+		.flags = MWAIT2flg(0x10) | CPUIDLE_FLAG_TLB_FLUSHED,
+		.exit_latency = 120,
+		.target_residency = 500,
+	},
+	{}
+};
+
 static void mwait_idle(void)
 {
 	unsigned int cpu = smp_processor_id();
@@ -746,6 +762,10 @@ static const struct idle_cpu idle_cpu_avn = {
 	.disable_promotion_to_c1e = 1,
 };
 
+static const struct idle_cpu idle_cpu_knl = {
+	.state_table = knl_cstates,
+};
+
 #define ICPU(model, cpu) \
     { X86_VENDOR_INTEL, 6, model, X86_FEATURE_MONITOR, \
         &idle_cpu_##cpu}
@@ -778,6 +798,7 @@ static const struct x86_cpu_id intel_idle_ids[] __initconst = {
 	ICPU(0x56, bdw),
 	ICPU(0x4e, skl),
 	ICPU(0x5e, skl),
+	ICPU(0x57, knl),
 	{}
 };