[Qemu-devel] [PATCH v2]booke: timer: Deactivate timer for target_bit above 61

[Bharat Bhushan]

QEMU timer supports a maximum timer of INT64_MAX. So starting timer only for
time which is calculated using target_bit < 62 and deactivate/stop timer if
the target bit is above 61.

This patch also fix the time calculation from target_bit.
The code was doing (1 << (target_bit + 1)) while this
should be (1ULL << (target_bit + 1)).

Signed-off-by: Bharat Bhushan <address@hidden>
---
v1->v2
 - Added "booke: timer:" in patch subject

 hw/ppc/ppc_booke.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/hw/ppc/ppc_booke.c b/hw/ppc/ppc_booke.c
index e41b036..f4eda15 100644
--- a/hw/ppc/ppc_booke.c
+++ b/hw/ppc/ppc_booke.c
@@ -133,9 +133,15 @@ static void booke_update_fixed_timer(CPUPPCState         
*env,
     ppc_tb_t *tb_env = env->tb_env;
     uint64_t lapse;
     uint64_t tb;
-    uint64_t period = 1 << (target_bit + 1);
+    uint64_t period;
     uint64_t now;
 
+    /* Deactivate timer for target_bit > 61 */
+    if (target_bit > 61)
+        return; 
+
+    period = 1ULL << (target_bit + 1);
+
     now = qemu_get_clock_ns(vm_clock);
     tb  = cpu_ppc_get_tb(tb_env, now, tb_env->tb_offset);
 
-- 
1.7.0.4