Re: [PATCH v5 2/5] target/loongarch: Add default cpucfg3 with LA464 CPU

[gaosong]

在 2026/2/25 上午9:41, Bibo Mao 写道:

The features shown in cpucfg3 mostly are relative with cache capability,
QEMU does not support cache emulation and discard these features.
However it will be better if it is the same with host machine.

Here add default cpucfg3 feature information with LA464 CPU.

Signed-off-by: Bibo Mao <maob...@loongson.cn>
---
  target/loongarch/cpu.c | 16 ++++++++++++++++
  1 file changed, 16 insertions(+)

Reviewed-by: Song Gao <gaos...@loongson.cn>

Thanks.
Song Gao

diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index f04558027d..93980e62a3 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -321,6 +321,22 @@ static void loongarch_la464_initfn(Object *obj)
      data = FIELD_DP32(data, CPUCFG2, LAM, 1);
      env->cpucfg[2] = data;

+ data = 0;

+    data = FIELD_DP32(data, CPUCFG3, CCDMA, 1);
+    data = FIELD_DP32(data, CPUCFG3, UCACC, 1);
+    data = FIELD_DP32(data, CPUCFG3, LLEXC, 1);
+    data = FIELD_DP32(data, CPUCFG3, SCDLY, 1);
+    data = FIELD_DP32(data, CPUCFG3, LLDBAR, 1);
+    data = FIELD_DP32(data, CPUCFG3, ITLBHMC, 1);
+    data = FIELD_DP32(data, CPUCFG3, ICHMC, 1);
+    data = FIELD_DP32(data, CPUCFG3, SPW_LVL, 4);
+    data = FIELD_DP32(data, CPUCFG3, SPW_HP_HF, 1);
+    if (kvm_enabled()) {
+        data = FIELD_DP32(data, CPUCFG3, RVA, 1);
+        data = FIELD_DP32(data, CPUCFG3, RVAMAX, 7);
+    }
+    env->cpucfg[3] = data;
+
      env->cpucfg[4] = 100 * 1000 * 1000; /* Crystal frequency */

data = 0;