[PATCH V2] target/loongarch: fix vcpu reset command word issue

[Xianglai Li]

When the KVM_REG_LOONGARCH_VCPU_RESET command word
is sent to the kernel through the kvm_set_one_reg interface,
the parameter source needs to be a legal address,
otherwise the kernel will return an error and the command word
will fail to be sent.

Signed-off-by: Xianglai Li <lixiang...@loongson.cn>
---
Cc: Bibo Mao <maob...@loongson.cn>
Cc: Philippe Mathieu-Daudé <phi...@linaro.org>
Cc: Song Gao <gaos...@loongson.cn>
Cc: Xianglai Li <lixiang...@loongson.cn>

CHANGE:
V2<-V1:
  1.Sets the initial value of the variable and
  adds a function return value judgment and prints a log

 target/loongarch/kvm/kvm.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/target/loongarch/kvm/kvm.c b/target/loongarch/kvm/kvm.c
index a3f55155b0..3f499e60ab 100644
--- a/target/loongarch/kvm/kvm.c
+++ b/target/loongarch/kvm/kvm.c
@@ -581,9 +581,14 @@ static int kvm_loongarch_get_lbt(CPUState *cs)
 void kvm_arch_reset_vcpu(CPUState *cs)
 {
     CPULoongArchState *env = cpu_env(cs);
+    int ret = 0;
+    uint64_t unused = 0;
 
     env->mp_state = KVM_MP_STATE_RUNNABLE;
-    kvm_set_one_reg(cs, KVM_REG_LOONGARCH_VCPU_RESET, 0);
+    ret = kvm_set_one_reg(cs, KVM_REG_LOONGARCH_VCPU_RESET, &unused);
+    if (ret) {
+        error_report("Failed to set KVM_REG_LOONGARCH_VCPU_RESET");
+    }
 }
 
 static int kvm_loongarch_get_mpstate(CPUState *cs)
-- 
2.39.1