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>
---
v5:
- Revert " Enbale watchdog support only when user specifies watchdog-action"
- Moved the logic into hw/ppc_booke.c
v4: Enbale watchdog support only when user specifies watchdog-action
Earlier this was [3/3] of the patch series. Now because i separated
linux-header updation in separate patch, so this become [4/4]
v3:
- TSR clearing is removed in whatchdog exit handling as this is
no more needed.
v2:
- Merged ([PATCH 3/4] Watchdog exit handling support) and
([PATCH 4/4] Enable to use kvm emulated watchdog)
- Clear watchdog state machine when VM state changes to running.
hw/ppc.h | 2 +
hw/ppc_booke.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
target-ppc/kvm.c | 12 ++++++++-
3 files changed, 84 insertions(+), 1 deletions(-)
diff --git a/hw/ppc.h b/hw/ppc.h
index 2f3ea27..3672fe8 100644
--- a/hw/ppc.h
+++ b/hw/ppc.h
@@ -44,6 +44,8 @@ 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);
+extern int cap_ppc_watchdog;
+extern int cap_booke_sregs;
/* Embedded PowerPC DCR management */
typedef uint32_t (*dcr_read_cb)(void *opaque, int dcrn);
typedef void (*dcr_write_cb)(void *opaque, int dcrn, uint32_t val);
diff --git a/hw/ppc_booke.c b/hw/ppc_booke.c
index 837a5b6..f18df74 100644
--- a/hw/ppc_booke.c
+++ b/hw/ppc_booke.c
@@ -21,6 +21,8 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
+#include "sysemu.h"
+#include "kvm.h"
#include "hw.h"
#include "ppc.h"
#include "qemu-timer.h"
@@ -203,6 +205,11 @@ static void booke_wdt_cb(void *opaque)
booke_timer->wdt_timer);
}
+static void ppc_booke_watchdog_clear_tsr(CPUPPCState *env, target_ulong tsr)
+{
+ env->spr[SPR_BOOKE_TSR] = tsr & ~(TSR_ENW | TSR_WIS | TSR_WRS_MASK);
+}
+
void store_booke_tsr(CPUPPCState *env, target_ulong val)
{
env->spr[SPR_BOOKE_TSR] &= ~val;
@@ -241,6 +248,64 @@ static void ppc_booke_timer_reset_handle(void *opaque)
booke_update_irq(env);
}
+static void cpu_state_change_handler(void *opaque, int running, RunState state)
+{
+ CPUPPCState *env = opaque;
+
+ struct kvm_sregs sregs;
+
+ if (!running) {
+ return;
+ }
+
+ /*
+ * Clear watchdog interrupt condition by clearing TSR.
+ * Similar logic needed to be implemented for watchdog
+ * emulation in qemu.
+ */
+
+ if (!kvm_enabled()) {
+ /* FIXME: add handling for qemu emulated case */
+ return;
+ }
+
+ if (cap_booke_sregs && cap_ppc_watchdog) {
+ kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
+
+ /* Clear TSR.ENW, TSR.WIS and TSR.WRS */
+ ppc_booke_watchdog_clear_tsr(env, sregs.u.e.tsr);
+ sregs.u.e.tsr = env->spr[SPR_BOOKE_TSR];
+ sregs.u.e.update_special = KVM_SREGS_E_UPDATE_TSR;
+
+ kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs);
+ }
+}
+
+static int kvm_booke_watchdog_enable(CPUPPCState *env)
+{
+ int ret;
+ struct kvm_enable_cap encap = {};
+
+ if (!kvm_enabled()) {
+ return 0;
+ }
+
+ if (!cap_ppc_watchdog) {
+ printf("warning: KVM does not support watchdog");
+ return 0;
+ }
+
+ encap.cap = KVM_CAP_PPC_BOOKE_WATCHDOG;
+ ret = kvm_vcpu_ioctl(env, 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;
+}
+
void ppc_booke_timers_init(CPUPPCState *env, uint32_t freq, uint32_t flags)
{
ppc_tb_t *tb_env;
@@ -262,5 +327,11 @@ void ppc_booke_timers_init(CPUPPCState *env, uint32_t
freq, uint32_t flags)
booke_timer->wdt_timer =
qemu_new_timer_ns(vm_clock, &booke_wdt_cb, env);
+ if (kvm_enabled()) {
+ kvm_booke_watchdog_enable(env);
+ }
+
+ qemu_add_vm_change_state_handler(cpu_state_change_handler, env);
+
qemu_register_reset(ppc_booke_timer_reset_handle, env);
}
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
index 829e180..b1c23fd 100644
--- a/target-ppc/kvm.c
+++ b/target-ppc/kvm.c
@@ -32,6 +32,7 @@
#include "device_tree.h"
#include "hw/sysbus.h"
#include "hw/spapr.h"
+#include "hw/watchdog.h"
#include "hw/sysbus.h"
#include "hw/spapr.h"
@@ -56,10 +57,11 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
static int cap_interrupt_unset = false;
static int cap_interrupt_level = false;
static int cap_segstate;
-static int cap_booke_sregs;
+int cap_booke_sregs;
static int cap_ppc_smt;
static int cap_ppc_rma;
static int cap_spapr_tce;
+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
@@ -86,6 +88,7 @@ int kvm_arch_init(KVMState *s)
cap_ppc_smt = kvm_check_extension(s, KVM_CAP_PPC_SMT);
cap_ppc_rma = kvm_check_extension(s, KVM_CAP_PPC_RMA);
cap_spapr_tce = kvm_check_extension(s, KVM_CAP_SPAPR_TCE);
+ 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 "
@@ -769,6 +772,13 @@ int kvm_arch_handle_exit(CPUPPCState *env, struct kvm_run
*run)
ret = 1;
break;
#endif
+#ifdef KVM_EXIT_WATCHDOG
+ case KVM_EXIT_WATCHDOG:
+ dprintf("handle watchdog expiry\n");
+ watchdog_perform_action();
+ ret = 0;
+ break;
+#endif
default:
fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);
ret = -1;
--
1.7.0.4
