target/ppc/spapr: Enable the large decrementer for pseries-4.0

Enable the large decrementer by default for the pseries-4.0 machine type.
It is disabled again by default_caps_with_cpu() for pre-POWER9 cpus
since they don't support the large decrementer.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Message-Id: <20190301024317.22137-4-sjitindarsingh@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 6b54ad260a542bb95b4b4617b4c439c603a3d762..8e24d7dc50248933f209dd8384ccb541c094423b 100644 (file)
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -4311,7 +4311,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
     smc->default_caps.caps[SPAPR_CAP_IBS] = SPAPR_CAP_BROKEN;
     smc->default_caps.caps[SPAPR_CAP_HPT_MAXPAGESIZE] = 16; /* 64kiB */
     smc->default_caps.caps[SPAPR_CAP_NESTED_KVM_HV] = SPAPR_CAP_OFF;
-    smc->default_caps.caps[SPAPR_CAP_LARGE_DECREMENTER] = SPAPR_CAP_OFF;
+    smc->default_caps.caps[SPAPR_CAP_LARGE_DECREMENTER] = SPAPR_CAP_ON;
     spapr_caps_add_properties(smc, &error_abort);
     smc->irq = &spapr_irq_xics;
     smc->dr_phb_enabled = true;
@@ -4387,6 +4387,7 @@ static void spapr_machine_3_1_class_options(MachineClass *mc)
     mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power8_v2.0");
     smc->update_dt_enabled = false;
     smc->dr_phb_enabled = false;
+    smc->default_caps.caps[SPAPR_CAP_LARGE_DECREMENTER] = SPAPR_CAP_OFF;
 }
 
 DEFINE_SPAPR_MACHINE(3_1, "3.1", false);

diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c
index 942ac8ebbe5b22d92099dd4006304074d51a9f03..faab472d06f6deaf59ddad5fa61054b6a563372c 100644 (file)
--- a/hw/ppc/spapr_caps.c
+++ b/hw/ppc/spapr_caps.c
@@ -541,6 +541,11 @@ static sPAPRCapabilities default_caps_with_cpu(sPAPRMachineState *spapr,
 
     caps = smc->default_caps;
 
+    if (!ppc_type_check_compat(cputype, CPU_POWERPC_LOGICAL_3_00,
+                               0, spapr->max_compat_pvr)) {
+        caps.caps[SPAPR_CAP_LARGE_DECREMENTER] = SPAPR_CAP_OFF;
+    }
+
     if (!ppc_type_check_compat(cputype, CPU_POWERPC_LOGICAL_2_07,
                                0, spapr->max_compat_pvr)) {
         caps.caps[SPAPR_CAP_HTM] = SPAPR_CAP_OFF;