[PATCH RFC v4 6/9] target/loongarch: Implement kvm_arch_init_vcpu

[xianglai li <lixianglai@xxxxxxxxxxx>]

From: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>

Implement kvm_arch_init_vcpu interface for loongarch,
in this function, we register VM change state handler.
And when VM state changes to running, the counter value
should be put into kvm to keep consistent with kvm,
and when state change to stop, counter value should be
refreshed from kvm.

Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Cornelia Huck <cohuck@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: "Marc-André Lureau" <marcandre.lureau@xxxxxxxxxx>
Cc: "Daniel P. Berrangé" <berrange@xxxxxxxxxx>
Cc: Thomas Huth <thuth@xxxxxxxxxx>
Cc: "Philippe Mathieu-Daudé" <philmd@xxxxxxxxxx>
Cc: Richard Henderson <richard.henderson@xxxxxxxxxx>
Cc: Peter Maydell <peter.maydell@xxxxxxxxxx>
Cc: Bibo Mao <maobibo@xxxxxxxxxxx>
Cc: Song Gao <gaosong@xxxxxxxxxxx>
Cc: Xiaojuan Yang <yangxiaojuan@xxxxxxxxxxx>
Cc: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>

Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>
Signed-off-by: xianglai li <lixianglai@xxxxxxxxxxx>
---
 target/loongarch/cpu.h        |  2 ++
 target/loongarch/kvm.c        | 23 +++++++++++++++++++++++
 target/loongarch/trace-events |  2 ++
 3 files changed, 27 insertions(+)

diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h
index 2580dc26e1..49edf6b016 100644
--- a/target/loongarch/cpu.h
+++ b/target/loongarch/cpu.h
@@ -382,6 +382,8 @@ struct ArchCPU {
 
     /* 'compatible' string for this CPU for Linux device trees */
     const char *dtb_compatible;
+    /* used by KVM_REG_LOONGARCH_COUNTER ioctl to access guest time counters */
+    uint64_t kvm_state_counter;
 };
 
 #define TYPE_LOONGARCH_CPU "loongarch-cpu"
diff --git a/target/loongarch/kvm.c b/target/loongarch/kvm.c
index 5e3bda444e..9754478e34 100644
--- a/target/loongarch/kvm.c
+++ b/target/loongarch/kvm.c
@@ -443,8 +443,31 @@ int kvm_arch_put_registers(CPUState *cs, int level)
     return ret;
 }
 
+static void kvm_loongarch_vm_stage_change(void *opaque, bool running,
+                                          RunState state)
+{
+    int ret;
+    CPUState *cs = opaque;
+    LoongArchCPU *cpu = LOONGARCH_CPU(cs);
+
+    if (running) {
+        ret = kvm_larch_putq(cs, KVM_REG_LOONGARCH_COUNTER,
+                             &cpu->kvm_state_counter);
+        if (ret < 0) {
+            trace_kvm_failed_put_counter(strerror(errno));
+        }
+    } else {
+        ret = kvm_larch_getq(cs, KVM_REG_LOONGARCH_COUNTER,
+                             &cpu->kvm_state_counter);
+        if (ret < 0) {
+            trace_kvm_failed_get_counter(strerror(errno));
+        }
+    }
+}
+
 int kvm_arch_init_vcpu(CPUState *cs)
 {
+    qemu_add_vm_change_state_handler(kvm_loongarch_vm_stage_change, cs);
     return 0;
 }
 
diff --git a/target/loongarch/trace-events b/target/loongarch/trace-events
index ceba80121b..f801ad7c76 100644
--- a/target/loongarch/trace-events
+++ b/target/loongarch/trace-events
@@ -9,5 +9,7 @@ kvm_failed_get_fpu(const char *msg) "Failed to get fpu from KVM: %s"
 kvm_failed_put_fpu(const char *msg) "Failed to put fpu into KVM: %s"
 kvm_failed_get_mpstate(const char *msg) "Failed to get mp_state from KVM: %s"
 kvm_failed_put_mpstate(const char *msg) "Failed to put mp_state into KVM: %s"
+kvm_failed_get_counter(const char *msg) "Failed to get counter from KVM: %s"
+kvm_failed_put_counter(const char *msg) "Failed to put counter into KVM: %s"
 kvm_failed_get_cpucfg(const char *msg) "Failed to get cpucfg from KVM: %s"
 kvm_failed_put_cpucfg(const char *msg) "Failed to put cpucfg into KVM: %s"
-- 
2.39.1