aboutsummaryrefslogtreecommitdiff
path: root/target-ppc/translate_init.c
diff options
context:
space:
mode:
authorAlexey Kardashevskiy <aik@ozlabs.ru>2014-05-23 12:26:56 +1000
committerAlexander Graf <agraf@suse.de>2014-06-16 13:24:38 +0200
commit2a48d99335c572b0d3da59c1387ad131ea6ee590 (patch)
treea4fae45358817a2a74dbfc8a85d29809e3d44c03 /target-ppc/translate_init.c
parent82677ed2f5d700d2344689bea30d75887f9a8cf4 (diff)
spapr: Limit threads per core according to current compatibility mode
This puts a limit to the number of threads per core based on the current compatibility mode. Although PowerISA specs do not specify the maximum threads per core number, the linux guest still expects that PowerISA2.05-compatible CPU supports only 2 threads per core as this is what POWER6 (2.05 compliant CPU) implements, the same is for POWER7 (2.06, 4 threads) and POWER8 (2.07, 8 threads). This calls spapr_fixup_cpu_smt_dt() with the maximum allowed number of threads which affects ibm,ppc-interrupt-server#s and ibm,ppc-interrupt-gserver#s properties. The number of CPU nodesremains unchanged. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc/translate_init.c')
-rw-r--r--target-ppc/translate_init.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index faac74a33c..56d3b97368 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -8921,6 +8921,33 @@ static void ppc_cpu_unrealizefn(DeviceState *dev, Error **errp)
}
}
+int ppc_get_compat_smt_threads(PowerPCCPU *cpu)
+{
+ int ret = smp_threads;
+ PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
+
+ switch (cpu->cpu_version) {
+ case CPU_POWERPC_LOGICAL_2_05:
+ ret = 2;
+ break;
+ case CPU_POWERPC_LOGICAL_2_06:
+ ret = 4;
+ break;
+ case CPU_POWERPC_LOGICAL_2_07:
+ ret = 8;
+ break;
+ default:
+ if (pcc->pcr_mask & PCR_COMPAT_2_06) {
+ ret = 4;
+ } else if (pcc->pcr_mask & PCR_COMPAT_2_05) {
+ ret = 2;
+ }
+ break;
+ }
+
+ return MIN(ret, smp_threads);
+}
+
int ppc_set_compat(PowerPCCPU *cpu, uint32_t cpu_version)
{
int ret = 0;