qemu/target-loongarch-fix-vcpu-reset-command-word-issue.patch

From 655073e4e179e601e35a444f585d8e2049df97f5 Mon Sep 17 00:00:00 2001
From: Xianglai Li <lixianglai@loongson.cn>
Date: Wed, 5 Feb 2025 19:56:54 +0800
Subject: [PATCH] target/loongarch: fix vcpu reset command word issue

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 <lixianglai@loongson.cn>
---
 target/loongarch/cpu.c     | 2 +-
 target/loongarch/kvm/kvm.c | 9 ++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index ee764f0bc7..570ce8be3b 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -638,8 +638,8 @@ static void loongarch_cpu_realizefn(DeviceState *dev, Error **errp)
 
     loongarch_cpu_register_gdb_regs_for_features(cs);
 
-    cpu_reset(cs);
     qemu_init_vcpu(cs);
+    cpu_reset(cs);
 
     lacc->parent_realize(dev, errp);
 }
diff --git a/target/loongarch/kvm/kvm.c b/target/loongarch/kvm/kvm.c
index 0acdd5c4c1..277210ca04 100644
--- a/target/loongarch/kvm/kvm.c
+++ b/target/loongarch/kvm/kvm.c
@@ -590,9 +590,16 @@ 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: %s",
+                     strerror(errno));
+        exit(EXIT_FAILURE);
+    }
 }
 
 static int kvm_loongarch_get_mpstate(CPUState *cs)
-- 
2.41.0.windows.1