From: Meng Zhuo <mengzhuo@iscas.ac.cn>

This patch adds max_satp_mode from host kvm cpu setting.

Tested on: Milkv Megrez (Eswin 7700x)

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2931
Signed-off-by: Meng Zhuo <mengzhuo@iscas.ac.cn>
Message-ID: <20250606034250.181707-1-mengzhuo@iscas.ac.cn>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
 target/riscv/kvm/kvm-cpu.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index e1a04be20f..502d33f404 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -999,6 +999,19 @@ static void kvm_riscv_destroy_scratch_vcpu(KVMScratchCPU *scratch)
     close(scratch->kvmfd);
 }
 
+static void kvm_riscv_init_max_satp_mode(RISCVCPU *cpu, KVMScratchCPU *kvmcpu)
+{
+    struct kvm_one_reg reg;
+    int ret;
+
+    reg.id = RISCV_CONFIG_REG(satp_mode);
+    reg.addr = (uint64_t)&cpu->cfg.max_satp_mode;
+    ret = ioctl(kvmcpu->cpufd, KVM_GET_ONE_REG, &reg);
+    if (ret != 0) {
+        error_report("Unable to retrieve satp mode from host, error %d", ret);
+    }
+}
+
 static void kvm_riscv_init_machine_ids(RISCVCPU *cpu, KVMScratchCPU *kvmcpu)
 {
     struct kvm_one_reg reg;
@@ -1302,6 +1315,7 @@ static void riscv_init_kvm_registers(Object *cpu_obj)
     kvm_riscv_init_machine_ids(cpu, &kvmcpu);
     kvm_riscv_init_misa_ext_mask(cpu, &kvmcpu);
     kvm_riscv_init_cfg(cpu, &kvmcpu);
+    kvm_riscv_init_max_satp_mode(cpu, &kvmcpu);
 
     kvm_riscv_destroy_scratch_vcpu(&kvmcpu);
 }
@@ -1985,7 +1999,7 @@ static bool kvm_cpu_realize(CPUState *cs, Error **errp)
         }
     }
 
-   return true;
+    return true;
 }
 
 void riscv_kvm_cpu_finalize_features(RISCVCPU *cpu, Error **errp)
-- 
2.50.0