[Qemu-devel] [PATCH for-2.13 07/10] spapr: Make a helper to set up cpu entry point state

[David Gibson <david@gibson.dropbear.id.au>]

Under PAPR, only the boot CPU is active when the system starts.  Other cpus
must be explicitly activated using an RTAS call.  The entry state for the
boot and secondary cpus isn't identical, but it has some things in common.
We're going to add a bit more common setup later, too, so to simplify
make a helper which sets up the common entry state for both boot and
secondary cpu threads.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
 hw/ppc/spapr.c                  | 4 +---
 hw/ppc/spapr_cpu_core.c         | 9 +++++++++
 hw/ppc/spapr_rtas.c             | 6 +++---
 include/hw/ppc/spapr_cpu_core.h | 3 +++
 4 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index fbb2c6752c..e0cabfa6ee 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -1536,10 +1536,8 @@ static void spapr_machine_reset(void)
     g_free(fdt);
 
     /* Set up the entry state */
-    first_ppc_cpu->env.gpr[3] = fdt_addr;
+    spapr_cpu_set_entry_state(first_ppc_cpu, SPAPR_ENTRY_POINT, fdt_addr);
     first_ppc_cpu->env.gpr[5] = 0;
-    first_cpu->halted = 0;
-    first_ppc_cpu->env.nip = SPAPR_ENTRY_POINT;
 
     spapr->cas_reboot = false;
 }
diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index b1c3cf11f0..ecd40dbf03 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -80,6 +80,15 @@ static void spapr_cpu_reset(void *opaque)
     env->spr[SPR_AMOR] = 0xffffffffffffffffull;
 }
 
+void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip, target_ulong r3)
+{
+    CPUPPCState *env = &cpu->env;
+
+    env->nip = SPAPR_ENTRY_POINT;
+    env->gpr[3] = r3;
+    CPU(cpu)->halted = 0;
+}
+
 static void spapr_cpu_destroy(PowerPCCPU *cpu)
 {
     qemu_unregister_reset(spapr_cpu_reset, cpu);
diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
index 0ec5fa4cfe..d79aa44467 100644
--- a/hw/ppc/spapr_rtas.c
+++ b/hw/ppc/spapr_rtas.c
@@ -37,6 +37,7 @@
 #include "hw/ppc/spapr.h"
 #include "hw/ppc/spapr_vio.h"
 #include "hw/ppc/spapr_rtas.h"
+#include "hw/ppc/spapr_cpu_core.h"
 #include "hw/ppc/ppc.h"
 #include "hw/boards.h"
 
@@ -173,14 +174,13 @@ static void rtas_start_cpu(PowerPCCPU *cpu_, sPAPRMachineState *spapr,
          * new cpu enters */
         kvm_cpu_synchronize_state(cs);
 
+        spapr_cpu_set_entry_state(cpu, start, r3);
+
         env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 
         /* Enable Power-saving mode Exit Cause exceptions for the new CPU */
         env->spr[SPR_LPCR] |= pcc->lpcr_pm;
 
-        env->nip = start;
-        env->gpr[3] = r3;
-        cs->halted = 0;
         spapr_cpu_set_endianness(cpu);
         spapr_cpu_update_tb_offset(cpu);
 
diff --git a/include/hw/ppc/spapr_cpu_core.h b/include/hw/ppc/spapr_cpu_core.h
index 1a38544706..11cab30838 100644
--- a/include/hw/ppc/spapr_cpu_core.h
+++ b/include/hw/ppc/spapr_cpu_core.h
@@ -12,6 +12,7 @@
 #include "hw/qdev.h"
 #include "hw/cpu/core.h"
 #include "target/ppc/cpu-qom.h"
+#include "target/ppc/cpu.h"
 
 #define TYPE_SPAPR_CPU_CORE "spapr-cpu-core"
 #define SPAPR_CPU_CORE(obj) \
@@ -40,4 +41,6 @@ typedef struct sPAPRCPUCoreClass {
 const char *spapr_get_cpu_core_type(const char *cpu_type);
 void spapr_cpu_core_reset(sPAPRCPUCore *sc);
 
+void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip, target_ulong r3);
+
 #endif
-- 
2.14.3