[Qemu-devel] [PATCH 5/5] hpet: run on dedicate thread

[Liu Ping Fan <qemulist@gmail.com>]

migration is not supported yet.

Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
---
 hw/timer/hpet.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/hw/timer/hpet.c b/hw/timer/hpet.c
index ae54b87..8e32e36 100644
--- a/hw/timer/hpet.c
+++ b/hw/timer/hpet.c
@@ -91,6 +91,10 @@ typedef struct HPETState {
     uint32_t intcap;
     HPETTimer timer[HPET_MAX_TIMERS];
     bool dedicate_mode;
+    AioContext *ctx;
+    bool created;
+    bool stop;
+    QemuThread t;
 
     /* Memory-mapped, software visible registers */
     uint64_t capability;        /* capabilities */
@@ -702,6 +706,16 @@ static const MemoryRegionOps hpet_ram_ops = {
     .endianness = DEVICE_NATIVE_ENDIAN,
 };
 
+static void *hpet_work_thread(void *opaque)
+{
+    HPETState *hpet = opaque;
+
+    while (!hpet->stop) {
+        aio_poll(hpet->ctx, true);
+    }
+    return NULL;
+}
+
 static void hpet_reset(DeviceState *d)
 {
     HPETState *s = HPET(d);
@@ -732,6 +746,11 @@ static void hpet_reset(DeviceState *d)
 
     /* to document that the RTC lowers its output on reset as well */
     s->rtc_irq_level = 0;
+    if (!s->created) {
+        s->created = true;
+        qemu_thread_create(&s->t, hpet_work_thread, s, QEMU_THREAD_JOINABLE);
+    }
+
 }
 
 static void hpet_handle_legacy_irq(void *opaque, int n, int level)
@@ -788,10 +807,20 @@ static void hpet_realize(DeviceState *dev, Error **errp)
     } else if (s->num_timers > HPET_MAX_TIMERS) {
         s->num_timers = HPET_MAX_TIMERS;
     }
+    s->dedicate_mode = kvm_irqfds_enabled() ? true : false;
+    if (s->dedicate_mode) {
+        s->ctx = aio_context_new();
+    }
     for (i = 0; i < HPET_MAX_TIMERS; i++) {
         timer = &s->timer[i];
-        timer->qemu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, hpet_timer, timer);
         timer->tn = i;
+        if (s->dedicate_mode) {
+            timer->qemu_timer = aio_timer_new(s->ctx, QEMU_CLOCK_VIRTUAL,
+                        SCALE_NS, hpet_timer, timer);
+        } else {
+            timer->qemu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
+                        hpet_timer, timer);
+        }
         timer->state = s;
     }
 
-- 
1.8.1.4