[PULL,19/35] hw/ppc: Reset timebase facilities on machine reset

Commit Message

Cédric Le Goater Sept. 4, 2023, 9:06 a.m. UTC

From: Nicholas Piggin <[e-mail]>

Lower interrupts, delete timers, and set time facility registers
back to initial state on machine reset.

This is not so important for record-replay since timebase and
decrementer are migrated, but it gives a cleaner reset state.

Cc: Mark Cave-Ayland <[e-mail]>
Cc: BALATON Zoltan <[e-mail]>
Signed-off-by: Nicholas Piggin <[e-mail]>
Signed-off-by: Cédric Le Goater <[e-mail]>
---
 include/hw/ppc/ppc.h    |  3 ++-
 hw/ppc/mac_oldworld.c   |  1 +
 hw/ppc/pegasos2.c       |  1 +
 hw/ppc/pnv_core.c       |  2 ++
 hw/ppc/ppc.c            | 46 +++++++++++++++++++++++------------------
 hw/ppc/prep.c           |  1 +
 hw/ppc/spapr_cpu_core.c |  2 ++
 7 files changed, 35 insertions(+), 21 deletions(-)

Patch

diff --git a/include/hw/ppc/ppc.h b/include/hw/ppc/ppc.h
index e095c002dc24..17a8dfc10715 100644
--- a/include/hw/ppc/ppc.h
+++ b/include/hw/ppc/ppc.h
@@ -54,7 +54,8 @@  struct ppc_tb_t {
                                                */
 
 uint64_t cpu_ppc_get_tb(ppc_tb_t *tb_env, uint64_t vmclk, int64_t tb_offset);
-clk_setup_cb cpu_ppc_tb_init (CPUPPCState *env, uint32_t freq);
+void cpu_ppc_tb_init(CPUPPCState *env, uint32_t freq);
+void cpu_ppc_tb_reset(CPUPPCState *env);
 void cpu_ppc_tb_free(CPUPPCState *env);
 void cpu_ppc_hdecr_init(CPUPPCState *env);
 void cpu_ppc_hdecr_exit(CPUPPCState *env);
diff --git a/hw/ppc/mac_oldworld.c b/hw/ppc/mac_oldworld.c
index 510ff0eaaf93..9acc7adfc925 100644
--- a/hw/ppc/mac_oldworld.c
+++ b/hw/ppc/mac_oldworld.c
@@ -81,6 +81,7 @@  static void ppc_heathrow_reset(void *opaque)
 {
     PowerPCCPU *cpu = opaque;
 
+    cpu_ppc_tb_reset(&cpu->env);
     cpu_reset(CPU(cpu));
 }
 
diff --git a/hw/ppc/pegasos2.c b/hw/ppc/pegasos2.c
index 075367d94d00..bd397cf2b5c5 100644
--- a/hw/ppc/pegasos2.c
+++ b/hw/ppc/pegasos2.c
@@ -99,6 +99,7 @@  static void pegasos2_cpu_reset(void *opaque)
         cpu->env.gpr[1] = 2 * VOF_STACK_SIZE - 0x20;
         cpu->env.nip = 0x100;
     }
+    cpu_ppc_tb_reset(&cpu->env);
 }
 
 static void pegasos2_pci_irq(void *opaque, int n, int level)
diff --git a/hw/ppc/pnv_core.c b/hw/ppc/pnv_core.c
index 9b39d527de96..8c7afe037f00 100644
--- a/hw/ppc/pnv_core.c
+++ b/hw/ppc/pnv_core.c
@@ -61,6 +61,8 @@  static void pnv_core_cpu_reset(PnvCore *pc, PowerPCCPU *cpu)
     hreg_compute_hflags(env);
     ppc_maybe_interrupt(env);
 
+    cpu_ppc_tb_reset(env);
+
     pcc->intc_reset(pc->chip, cpu);
 }
 
diff --git a/hw/ppc/ppc.c b/hw/ppc/ppc.c
index d9a1cfbf91fe..f391acc39e11 100644
--- a/hw/ppc/ppc.c
+++ b/hw/ppc/ppc.c
@@ -944,23 +944,6 @@  void cpu_ppc_store_purr(CPUPPCState *env, uint64_t value)
                      &tb_env->purr_offset, value);
 }
 
-static void cpu_ppc_set_tb_clk (void *opaque, uint32_t freq)
-{
-    CPUPPCState *env = opaque;
-    PowerPCCPU *cpu = env_archcpu(env);
-    ppc_tb_t *tb_env = env->tb_env;
-
-    tb_env->tb_freq = freq;
-    tb_env->decr_freq = freq;
-    /* There is a bug in Linux 2.4 kernels:
-     * if a decrementer exception is pending when it enables msr_ee at startup,
-     * it's not ready to handle it...
-     */
-    _cpu_ppc_store_decr(cpu, 0xFFFFFFFF, 0xFFFFFFFF, 32);
-    _cpu_ppc_store_hdecr(cpu, 0xFFFFFFFF, 0xFFFFFFFF, 32);
-    cpu_ppc_store_purr(env, 0x0000000000000000ULL);
-}
-
 static void timebase_save(PPCTimebase *tb)
 {
     uint64_t ticks = cpu_get_host_ticks();
@@ -1062,7 +1045,7 @@  const VMStateDescription vmstate_ppc_timebase = {
 };
 
 /* Set up (once) timebase frequency (in Hz) */
-clk_setup_cb cpu_ppc_tb_init (CPUPPCState *env, uint32_t freq)
+void cpu_ppc_tb_init(CPUPPCState *env, uint32_t freq)
 {
     PowerPCCPU *cpu = env_archcpu(env);
     ppc_tb_t *tb_env;
@@ -1083,9 +1066,32 @@  clk_setup_cb cpu_ppc_tb_init (CPUPPCState *env, uint32_t freq)
     } else {
         tb_env->hdecr_timer = NULL;
     }
-    cpu_ppc_set_tb_clk(env, freq);
 
-    return &cpu_ppc_set_tb_clk;
+    tb_env->tb_freq = freq;
+    tb_env->decr_freq = freq;
+}
+
+void cpu_ppc_tb_reset(CPUPPCState *env)
+{
+    PowerPCCPU *cpu = env_archcpu(env);
+    ppc_tb_t *tb_env = env->tb_env;
+
+    timer_del(tb_env->decr_timer);
+    ppc_set_irq(cpu, PPC_INTERRUPT_DECR, 0);
+    tb_env->decr_next = 0;
+    if (tb_env->hdecr_timer != NULL) {
+        timer_del(tb_env->hdecr_timer);
+        ppc_set_irq(cpu, PPC_INTERRUPT_HDECR, 0);
+        tb_env->hdecr_next = 0;
+    }
+
+    /* There is a bug in Linux 2.4 kernels:
+     * if a decrementer exception is pending when it enables msr_ee at startup,
+     * it's not ready to handle it...
+     */
+    cpu_ppc_store_decr(env, -1);
+    cpu_ppc_store_hdecr(env, -1);
+    cpu_ppc_store_purr(env, 0x0000000000000000ULL);
 }
 
 void cpu_ppc_tb_free(CPUPPCState *env)
diff --git a/hw/ppc/prep.c b/hw/ppc/prep.c
index d9231c731775..f6fd35fcb9e3 100644
--- a/hw/ppc/prep.c
+++ b/hw/ppc/prep.c
@@ -67,6 +67,7 @@  static void ppc_prep_reset(void *opaque)
     PowerPCCPU *cpu = opaque;
 
     cpu_reset(CPU(cpu));
+    cpu_ppc_tb_reset(&cpu->env);
 }
 
 
diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index b482d9754a1f..91fae56573ee 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -74,6 +74,8 @@  static void spapr_reset_vcpu(PowerPCCPU *cpu)
 
     kvm_check_mmu(cpu, &error_fatal);
 
+    cpu_ppc_tb_reset(env);
+
     spapr_irq_cpu_intc_reset(spapr, cpu);
 }