[PATCH v4 12/12] target/riscv: Support virtual time context synchronization

[Yifei Jiang <jiangyifei@xxxxxxxxxx>]

Add virtual time context description to vmstate_kvmtimer. After cpu being
loaded, virtual time context is updated to KVM.

Signed-off-by: Yifei Jiang <jiangyifei@xxxxxxxxxx>
Signed-off-by: Mingwang Li <limingwang@xxxxxxxxxx>
Reviewed-by: Anup Patel <anup.patel@xxxxxxx>
Reviewed-by: Alistair Francis <alistair.francis@xxxxxxx>
---
 target/riscv/machine.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/target/riscv/machine.c b/target/riscv/machine.c
index ad8248ebfd..95eb82792a 100644
--- a/target/riscv/machine.c
+++ b/target/riscv/machine.c
@@ -164,6 +164,35 @@ static const VMStateDescription vmstate_pointermasking = {
     }
 };
 
+static bool kvmtimer_needed(void *opaque)
+{
+    return kvm_enabled();
+}
+
+static int cpu_post_load(void *opaque, int version_id)
+{
+    RISCVCPU *cpu = opaque;
+    CPURISCVState *env = &cpu->env;
+
+    env->kvm_timer_dirty = true;
+    return 0;
+}
+
+static const VMStateDescription vmstate_kvmtimer = {
+    .name = "cpu/kvmtimer",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = kvmtimer_needed,
+    .post_load = cpu_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT64(env.kvm_timer_time, RISCVCPU),
+        VMSTATE_UINT64(env.kvm_timer_compare, RISCVCPU),
+        VMSTATE_UINT64(env.kvm_timer_state, RISCVCPU),
+
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 const VMStateDescription vmstate_riscv_cpu = {
     .name = "cpu",
     .version_id = 3,
@@ -218,6 +247,7 @@ const VMStateDescription vmstate_riscv_cpu = {
         &vmstate_hyper,
         &vmstate_vector,
         &vmstate_pointermasking,
+        &vmstate_kvmtimer,
         NULL
     }
 };
-- 
2.19.1