[Qemu-devel] [PULL 08/62] target/ppc/spapr: Enable the large decrementer for pseries-4.0

[David Gibson]

From: Suraj Jitindar Singh <address@hidden>

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 <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: David Gibson <address@hidden>
---
 hw/ppc/spapr.c      | 3 ++-
 hw/ppc/spapr_caps.c | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 6b54ad260a..8e24d7dc50 100644
--- 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 942ac8ebbe..faab472d06 100644
--- 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;
-- 
2.20.1