[PATCH v2] x86/idle: Implement support for Meteor Lake

[Alex XZ Cypher Zero <me@xxxxxxxxx>]

Adds support for Meteor Lake C-states, following the reference implementation 
in Linux.

Signed-off-by: Alex XZ Cypher Zero <me@xxxxxxxxx>
---
 xen/arch/x86/cpu/mwait-idle.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/xen/arch/x86/cpu/mwait-idle.c b/xen/arch/x86/cpu/mwait-idle.c
index 5e98011bfd..1e90806c70 100644
--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -678,6 +678,28 @@ static struct cpuidle_state __read_mostly adl_l_cstates[] 
= {
        {}
 };
 
+static struct cpuidle_state __read_mostly mtl_l_cstates[] = {
+       {
+               .name = "C1E",
+               .flags = MWAIT2flg(0x01),
+               .exit_latency = 1,
+               .target_residency = 1,
+       },
+       {
+               .name = "C6",
+               .flags = MWAIT2flg(0x20) | CPUIDLE_FLAG_TLB_FLUSHED,
+               .exit_latency = 140,
+               .target_residency = 420
+       },
+       {
+               .name = "C10",
+               .flags = MWAIT2flg(0x60) | CPUIDLE_FLAG_TLB_FLUSHED,
+               .exit_latency = 310,
+               .target_residency = 930
+       },
+       {}
+};
+
 static struct cpuidle_state __read_mostly spr_cstates[] = {
        {
                .name = "C1",
@@ -1083,6 +1105,10 @@ static struct idle_cpu __read_mostly idle_cpu_adl_l = {
        .state_table = adl_l_cstates,
 };
 
+static struct idle_cpu __read_mostly idle_cpu_mtl_l = {
+       .state_table = mtl_l_cstates,
+};
+
 static struct idle_cpu __read_mostly idle_cpu_spr = {
        .state_table = spr_cstates,
        .c1e_promotion = C1E_PROMOTION_DISABLE,
@@ -1148,6 +1174,7 @@ static const struct x86_cpu_id intel_idle_ids[] 
__initconstrel = {
        ICPU(ICELAKE_D,                 icx),
        ICPU(ALDERLAKE,                 adl),
        ICPU(ALDERLAKE_L,               adl_l),
+       ICPU(METEORLAKE_L,              mtl_l),
        ICPU(SAPPHIRERAPIDS_X,          spr),
        ICPU(ATOM_GOLDMONT,             bxt),
        ICPU(ATOM_GOLDMONT_PLUS,        bxt),
-- 
2.50.0