diff --git a/target/loongarch/kvm/kvm.c b/target/loongarch/kvm/kvm.c
index 48cdb78a4c..0b72883ec9 100644
--- a/target/loongarch/kvm/kvm.c
+++ b/target/loongarch/kvm/kvm.c
@@ -725,7 +725,7 @@ static int kvm_loongarch_get_cpucfg(CPUState *cs)
 static int kvm_check_cpucfg2(CPUState *cs)
 {
     int ret;
-    uint64_t val;
+    uint64_t val = 0;
     struct kvm_device_attr attr = {
         .group = KVM_LOONGARCH_VCPU_CPUCFG,
         .attr = 2,
@@ -736,8 +736,17 @@ static int kvm_check_cpucfg2(CPUState *cs)
     ret = kvm_vcpu_ioctl(cs, KVM_HAS_DEVICE_ATTR, &attr);
 
     if (!ret) {
-        kvm_vcpu_ioctl(cs, KVM_GET_DEVICE_ATTR, &attr);
-        env->cpucfg[2] &= val;
+        /*
+         * The &= mask is best-effort feature negotiation. If HAS succeeded,
+         * a GET failure is most likely a copy_{from,to}_user issue; warn and
+         * keep the cpucfg2 the guest already has rather than failing the sync.
+         */
+        int r = kvm_vcpu_ioctl(cs, KVM_GET_DEVICE_ATTR, &attr);
+        if (r) {
+            warn_report("CPUCFG2: KVM_GET_DEVICE_ATTR: %s", strerror(errno));
+        } else {
+            env->cpucfg[2] &= val;
+        }
 
         if (FIELD_EX32(env->cpucfg[2], CPUCFG2, FP)) {
             /* The FP minimal version is 1. */