Re: [PATCH v3 4/9] target/loongarch: Implement kvm get/set registers

[gaosong]

在 2023/12/28 下午4:40, Tianrui Zhao 写道:

+static int kvm_loongarch_get_regs_fp(CPUState *cs)
+{
+    int ret, i;
+    struct kvm_fpu fpu;
+
+    LoongArchCPU *cpu = LOONGARCH_CPU(cs);
+    CPULoongArchState *env = &cpu->env;
+
+    ret = kvm_vcpu_ioctl(cs, KVM_GET_FPU, &fpu);
+    if (ret < 0) {
+        trace_kvm_failed_get_fpu(strerror(errno));
+        return ret;
+    }
+
+    env->fcsr0 = fpu.fcsr;
+    for (i = 0; i < 32; i++) {
+        env->fpr[i].vreg.UD[0] = fpu.fpr[i].val64[0];
+    }
+    for (i = 0; i < 8; i++) {
+        env->cf[i] = fpu.fcc & 0xFF;
+        fpu.fcc = fpu.fcc >> 8;
+    }
+

Use  write_fcc(env, fpu.fcc)

+    return ret;
+}
+
+static int kvm_loongarch_put_regs_fp(CPUState *cs)
+{
+    int ret, i;
+    struct kvm_fpu fpu;
+
+    LoongArchCPU *cpu = LOONGARCH_CPU(cs);
+    CPULoongArchState *env = &cpu->env;
+
+    fpu.fcsr = env->fcsr0;
+    fpu.fcc = 0;
+    for (i = 0; i < 32; i++) {
+        fpu.fpr[i].val64[0] = env->fpr[i].vreg.UD[0];
+    }
+
+    for (i = 0; i < 8; i++) {
+        fpu.fcc |= env->cf[i] << (8 * i);
+    }
+

Use fpu.fcc = read_fcc(env)

+    ret = kvm_vcpu_ioctl(cs, KVM_SET_FPU, &fpu);
+    if (ret < 0) {
+        trace_kvm_failed_put_fpu(strerror(errno));
+    }
+
+    return ret;
+}