Enable the KVM emulated watchdog if KVM supports (use the
capability enablement in watchdog handler). Also watchdog exit
(KVM_EXIT_WATCHDOG) handling is added.
Watchdog state machine is cleared whenever VM state changes to running.
This is to handle the cases like return from debug halt etc.
Signed-off-by: Bharat Bhushan <bharat.bhus...@freescale.com>
---
hw/ppc_booke.c | 48 ++++++++++++++++++++++++++++++++++++-
target-ppc/kvm.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++
target-ppc/kvm_ppc.h | 17 +++++++++++++
3 files changed, 128 insertions(+), 1 deletions(-)
diff --git a/hw/ppc_booke.c b/hw/ppc_booke.c
index 25a4e91..a6adca9 100644
--- a/hw/ppc_booke.c
+++ b/hw/ppc_booke.c
@@ -28,7 +28,7 @@
#include "nvram.h"
#include "qemu/log.h"
#include "loader.h"
-
+#include "kvm_ppc.h"
/* Timer Control Register */
@@ -210,7 +210,9 @@ void store_booke_tsr(CPUPPCState *env, target_ulong val)
{
PowerPCCPU *cpu = ppc_env_get_cpu(env);
+ kvmppc_sync_get_timer_regs(cpu);
env->spr[SPR_BOOKE_TSR] &= ~val;
+ kvmppc_sync_set_timer_regs(cpu);
booke_update_irq(cpu);
}
@@ -220,8 +222,10 @@ void store_booke_tcr(CPUPPCState *env, target_ulong val)
ppc_tb_t *tb_env = env->tb_env;
booke_timer_t *booke_timer = tb_env->opaque;
+ kvmppc_sync_get_timer_regs(cpu);
tb_env = env->tb_env;
env->spr[SPR_BOOKE_TCR] = val;
+ kvmppc_sync_set_timer_regs(cpu);
booke_update_irq(cpu);
@@ -237,13 +241,42 @@ void store_booke_tcr(CPUPPCState *env, target_ulong val)
}
+/*
+ * This function will be called whenever the CPU state changes.
+ * CPU states are defined "typedef enum RunState".
+ * Regarding timer, When CPU state changes to running after debug halt
+ * or similar cases which takes time then in between final watchdog
+ * expiry happenes. This will cause exit to QEMU and configured watchdog
+ * action will be taken. To avoid this we always clear the watchdog state when
+ * state changes to running.
+ */
+static void cpu_state_change_handler(void *opaque, int running, RunState state)
+{
+ PowerPCCPU *cpu = opaque;
+ CPUPPCState *env = &cpu->env;
+
+ if (!running) {
+ return;
+ }
+
+ /*
+ * Clear watchdog interrupt condition by clearing TSR.
+ */
+ store_booke_tsr(env, TSR_ENW | TSR_WIS | TSR_WRS_MASK);
+}
+
static void ppc_booke_timer_reset_handle(void *opaque)
{
PowerPCCPU *cpu = opaque;
CPUPPCState *env = &cpu->env;
+ /*
+ * No need to call kvmppc_sync_get_timer_regs() as all cpu registers
+ * will be synchronized before calling the reset handlers.
+ */
env->spr[SPR_BOOKE_TSR] = 0;
env->spr[SPR_BOOKE_TCR] = 0;
+ kvmppc_sync_set_timer_regs(cpu);
booke_update_irq(cpu);
}
@@ -252,6 +285,7 @@ void ppc_booke_timers_init(PowerPCCPU *cpu, uint32_t freq,
uint32_t flags)
{
ppc_tb_t *tb_env;
booke_timer_t *booke_timer;
+ int ret = 0;
tb_env = g_malloc0(sizeof(ppc_tb_t));
booke_timer = g_malloc0(sizeof(booke_timer_t));
@@ -269,5 +303,17 @@ void ppc_booke_timers_init(PowerPCCPU *cpu, uint32_t freq,
uint32_t flags)
booke_timer->wdt_timer =
qemu_new_timer_ns(vm_clock, &booke_wdt_cb, cpu);
+ ret = kvmppc_booke_watchdog_enable(cpu);
+
+ if (ret) {
+ /* TODO: Start the QEMU emulated watchdog if not running on KVM.
+ * Also start the QEMU emulated watchdog if KVM does not support
+ * emulated watchdog or somehow it is not enabled (supported but
+ * not enabled is though some bug and requires debugging :)).
+ */
+ }
+
+ qemu_add_vm_change_state_handler(cpu_state_change_handler, cpu);
+
qemu_register_reset(ppc_booke_timer_reset_handle, cpu);
}
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
index 4846acf..1c65478 100644
--- a/target-ppc/kvm.c
+++ b/target-ppc/kvm.c
@@ -36,6 +36,7 @@
#include "hw/sysbus.h"
#include "hw/spapr.h"
#include "hw/spapr_vio.h"
+#include "hw/watchdog.h"
//#define DEBUG_KVM
@@ -61,6 +62,7 @@ static int cap_ppc_smt;
static int cap_ppc_rma;
static int cap_spapr_tce;
static int cap_hior;
+static int cap_ppc_watchdog;
/* XXX We have a race condition where we actually have a level triggered
* interrupt, but the infrastructure can't expose that yet, so the guest
@@ -90,6 +92,7 @@ int kvm_arch_init(KVMState *s)
cap_ppc_rma = kvm_check_extension(s, KVM_CAP_PPC_RMA);
cap_spapr_tce = kvm_check_extension(s, KVM_CAP_SPAPR_TCE);
cap_hior = kvm_check_extension(s, KVM_CAP_PPC_HIOR);
+ cap_ppc_watchdog = kvm_check_extension(s, KVM_CAP_PPC_BOOKE_WATCHDOG);
if (!cap_interrupt_level) {
fprintf(stderr, "KVM: Couldn't find level irq capability. Expect the "
@@ -816,6 +819,61 @@ static int kvmppc_handle_dcr_write(CPUPPCState *env,
uint32_t dcrn, uint32_t dat
return 0;
}
+void kvmppc_sync_get_timer_regs(PowerPCCPU *cpu)
+{
+ CPUPPCState *env = &cpu->env;
+
+ if (kvm_enabled()) {
+ cpu_synchronize_state(env);
+ }
+}
+
+int kvmppc_sync_set_timer_regs(PowerPCCPU *cpu)
+{
+ CPUState *cs = CPU(cpu);
+ CPUPPCState *env = &cpu->env;
+ struct kvm_sregs sregs;
+ int ret;
+
+ if (!kvm_enabled() || !cap_booke_sregs) {
+ return -1;
+ }
+
+ sregs.u.e.tsr = env->spr[SPR_BOOKE_TSR];
+ sregs.u.e.tcr = env->spr[SPR_BOOKE_TCR];
+ sregs.u.e.update_special = KVM_SREGS_E_BASE | KVM_SREGS_E_UPDATE_TSR;
+
+ ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
+
+ return ret;
+}
+
+int kvmppc_booke_watchdog_enable(PowerPCCPU *cpu)
+{
+ CPUState *cs = CPU(cpu);
+ struct kvm_enable_cap encap = {};
+ int ret;
+
+ if (!kvm_enabled()) {
+ return -1;
+ }
+
+ if (!cap_ppc_watchdog) {
+ printf("warning: KVM does not support watchdog");
+ return -1;
+ }
+
+ encap.cap = KVM_CAP_PPC_BOOKE_WATCHDOG;
+ ret = kvm_vcpu_ioctl(cs, KVM_ENABLE_CAP, &encap);
+ if (ret < 0) {
+ fprintf(stderr, "%s: couldn't enable KVM_CAP_PPC_BOOKE_WATCHDOG: %s\n",
+ __func__, strerror(-ret));
+ return ret;
+ }
+
+ return ret;
+}
+
int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
{
PowerPCCPU *cpu = POWERPC_CPU(cs);
@@ -845,6 +903,12 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
ret = 0;
break;
#endif
+ case KVM_EXIT_WATCHDOG:
+ dprintf("handle watchdog expiry\n");
+ watchdog_perform_action();
+ ret = 0;
+ break;
+
default:
fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);
ret = -1;
diff --git a/target-ppc/kvm_ppc.h b/target-ppc/kvm_ppc.h
index 4b21723..8ae8fd8 100644
--- a/target-ppc/kvm_ppc.h
+++ b/target-ppc/kvm_ppc.h
@@ -26,6 +26,9 @@ int kvmppc_get_hypercall(CPUPPCState *env, uint8_t *buf, int
buf_len);
int kvmppc_set_interrupt(PowerPCCPU *cpu, int irq, int level);
void kvmppc_set_papr(PowerPCCPU *cpu);
int kvmppc_smt_threads(void);
+void kvmppc_sync_get_timer_regs(PowerPCCPU *cpu);
+int kvmppc_sync_set_timer_regs(PowerPCCPU *cpu);
+int kvmppc_booke_watchdog_enable(PowerPCCPU *cpu);
#ifndef CONFIG_USER_ONLY
off_t kvmppc_alloc_rma(const char *name, MemoryRegion *sysmem);
void *kvmppc_create_spapr_tce(uint32_t liobn, uint32_t window_size, int *pfd);
@@ -86,6 +89,20 @@ static inline int kvmppc_smt_threads(void)
return 1;
}
+static inline void kvmppc_sync_get_timer_regs(PowerPCCPU *cpu)
+{
+}
+
+static inline int kvmppc_sync_set_timer_regs(PowerPCCPU *cpu)
+{
+ return 0;
+}
+
+static inline int kvmppc_booke_watchdog_enable(PowerPCCPU *cpu)
+{
+ return -1;
+}
+
#ifndef CONFIG_USER_ONLY
static inline off_t kvmppc_alloc_rma(const char *name, MemoryRegion *sysmem)
{
--
1.7.0.4
