target/ppc: Add POWER9 DD2.2 model

POWER9 DD2.1 and earlier had significant limitations when running KVM,
including lack of "mixed mode" MMU support (ability to run HPT and RPT
mode on threads of the same core), and a translation prefetch issue
which is worked around by disabling "AIL" mode for the guest.

These processors are not widely available, and it's difficult to deal
with all these quirks in qemu +/- KVM, so create a POWER9 DD2.2 CPU
and make it the default POWER9 CPU.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Message-Id: <20230515160201.394587-1-npiggin@gmail.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>

9 files changed, 30 insertions, 9 deletions

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 11cb48af2f..590fc64b32 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -2171,7 +2171,7 @@ static void pnv_machine_power9_class_init(ObjectClass *oc, void *data)
     };
 
     mc->desc = "IBM PowerNV (Non-Virtualized) POWER9";
-    mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power9_v2.0");
+    mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power9_v2.2");
     compat_props_add(mc->compat_props, phb_compat, G_N_ELEMENTS(phb_compat));
 
     xfc->match_nvt = pnv_match_nvt;
diff --git a/hw/ppc/pnv_core.c b/hw/ppc/pnv_core.c
index 410f31bdf8..0bc3ad41c8 100644
--- a/hw/ppc/pnv_core.c
+++ b/hw/ppc/pnv_core.c
@@ -348,7 +348,7 @@ static const TypeInfo pnv_core_infos[] = {
     DEFINE_PNV_CORE_TYPE(power8, "power8e_v2.1"),
     DEFINE_PNV_CORE_TYPE(power8, "power8_v2.0"),
     DEFINE_PNV_CORE_TYPE(power8, "power8nvl_v1.0"),
-    DEFINE_PNV_CORE_TYPE(power9, "power9_v2.0"),
+    DEFINE_PNV_CORE_TYPE(power9, "power9_v2.2"),
     DEFINE_PNV_CORE_TYPE(power10, "power10_v2.0"),
 };
 
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index b623e23d6c..dcb7f1c70a 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -4631,7 +4631,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
 
     smc->dr_lmb_enabled = true;
     smc->update_dt_enabled = true;
-    mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power9_v2.0");
+    mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power9_v2.2");
     mc->has_hotpluggable_cpus = true;
     mc->nvdimm_supported = true;
     smc->resize_hpt_default = SPAPR_RESIZE_HPT_ENABLED;
diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index 8a4861f45a..9b88dd549a 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -390,6 +390,7 @@ static const TypeInfo spapr_cpu_core_type_infos[] = {
     DEFINE_SPAPR_CPU_CORE_TYPE("power8nvl_v1.0"),
     DEFINE_SPAPR_CPU_CORE_TYPE("power9_v1.0"),
     DEFINE_SPAPR_CPU_CORE_TYPE("power9_v2.0"),
+    DEFINE_SPAPR_CPU_CORE_TYPE("power9_v2.2"),
     DEFINE_SPAPR_CPU_CORE_TYPE("power10_v1.0"),
     DEFINE_SPAPR_CPU_CORE_TYPE("power10_v2.0"),
 #ifdef CONFIG_KVM
diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
index 409f3bf763..7e5fef7c43 100644
--- a/include/hw/ppc/pnv.h
+++ b/include/hw/ppc/pnv.h
@@ -48,7 +48,7 @@ DECLARE_INSTANCE_CHECKER(PnvChip, PNV_CHIP_POWER8,
 DECLARE_INSTANCE_CHECKER(PnvChip, PNV_CHIP_POWER8NVL,
                          TYPE_PNV_CHIP_POWER8NVL)
 
-#define TYPE_PNV_CHIP_POWER9 PNV_CHIP_TYPE_NAME("power9_v2.0")
+#define TYPE_PNV_CHIP_POWER9 PNV_CHIP_TYPE_NAME("power9_v2.2")
 DECLARE_INSTANCE_CHECKER(PnvChip, PNV_CHIP_POWER9,
                          TYPE_PNV_CHIP_POWER9)
 
diff --git a/target/ppc/cpu-models.c b/target/ppc/cpu-models.c
index 912b037c63..7dbb47de64 100644
--- a/target/ppc/cpu-models.c
+++ b/target/ppc/cpu-models.c
@@ -732,6 +732,8 @@
                 "POWER9 v1.0")
     POWERPC_DEF("power9_v2.0",   CPU_POWERPC_POWER9_DD20,            POWER9,
                 "POWER9 v2.0")
+    POWERPC_DEF("power9_v2.2",   CPU_POWERPC_POWER9_DD22,            POWER9,
+                "POWER9 v2.2")
     POWERPC_DEF("power10_v1.0",  CPU_POWERPC_POWER10_DD1,            POWER10,
                 "POWER10 v1.0")
     POWERPC_DEF("power10_v2.0",  CPU_POWERPC_POWER10_DD20,           POWER10,
@@ -907,7 +909,7 @@ PowerPCCPUAlias ppc_cpu_aliases[] = {
     { "power8e", "power8e_v2.1" },
     { "power8", "power8_v2.0" },
     { "power8nvl", "power8nvl_v1.0" },
-    { "power9", "power9_v2.0" },
+    { "power9", "power9_v2.2" },
     { "power10", "power10_v2.0" },
 #endif
 
diff --git a/target/ppc/cpu-models.h b/target/ppc/cpu-models.h
index a77e036b3a..572b5e553a 100644
--- a/target/ppc/cpu-models.h
+++ b/target/ppc/cpu-models.h
@@ -350,6 +350,7 @@ enum {
     CPU_POWERPC_POWER9_BASE        = 0x004E0000,
     CPU_POWERPC_POWER9_DD1         = 0x004E1100,
     CPU_POWERPC_POWER9_DD20        = 0x004E1200,
+    CPU_POWERPC_POWER9_DD22        = 0x004E1202,
     CPU_POWERPC_POWER10_BASE       = 0x00800000,
     CPU_POWERPC_POWER10_DD1        = 0x00801100,
     CPU_POWERPC_POWER10_DD20       = 0x00801200,
diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c
index 5aa0b3f0f1..05bf73296b 100644
--- a/target/ppc/cpu_init.c
+++ b/target/ppc/cpu_init.c
@@ -6284,9 +6284,26 @@ static bool ppc_pvr_match_power9(PowerPCCPUClass *pcc, uint32_t pvr, bool best)
         return false;
     }
 
-    if ((pvr & 0x0f00) == (pcc->pvr & 0x0f00)) {
-        /* Major DD version matches to power9_v1.0 and power9_v2.0 */
+    if ((pvr & 0x0f00) != (pcc->pvr & 0x0f00)) {
+        /* Major DD version does not match */
+        return false;
+    }
+
+    if ((pvr & 0x0f00) == 0x100) {
+        /* DD1.x always matches power9_v1.0 */
         return true;
+    } else if ((pvr & 0x0f00) == 0x200) {
+        if ((pvr & 0xf) < 2) {
+            /* DD2.0, DD2.1 match power9_v2.0 */
+            if ((pcc->pvr & 0xf) == 0) {
+                return true;
+            }
+        } else {
+            /* DD2.2, DD2.3 match power9_v2.2 */
+            if ((pcc->pvr & 0xf) == 2) {
+                return true;
+            }
+        }
     }
 
     return false;
diff --git a/tests/qtest/device-plug-test.c b/tests/qtest/device-plug-test.c
index abd544b70c..c6f33153eb 100644
--- a/tests/qtest/device-plug-test.c
+++ b/tests/qtest/device-plug-test.c
@@ -175,8 +175,8 @@ static void test_spapr_cpu_unplug_request(void)
 {
     QTestState *qtest;
 
-    qtest = qtest_initf("-cpu power9_v2.0 -smp 1,maxcpus=2 "
-                        "-device power9_v2.0-spapr-cpu-core,core-id=1,id=dev0");
+    qtest = qtest_initf("-cpu power9_v2.2 -smp 1,maxcpus=2 "
+                        "-device power9_v2.2-spapr-cpu-core,core-id=1,id=dev0");
 
     /* similar to test_pci_unplug_request */
     process_device_remove(qtest, "dev0");