@@ -410,6 +410,8 @@ static void riscv_max_cpu_init(Object *obj)
CPURISCVState *env = &cpu->env;
RISCVMXL mlx = MXL_RV64;
+ cpu->cfg.mmu = true;
+
#ifdef TARGET_RISCV32
mlx = MXL_RV32;
#endif
@@ -424,7 +426,11 @@ static void riscv_max_cpu_init(Object *obj)
#if defined(TARGET_RISCV64)
static void rv64_base_cpu_init(Object *obj)
{
- CPURISCVState *env = &RISCV_CPU(obj)->env;
+ RISCVCPU *cpu = RISCV_CPU(obj);
+ CPURISCVState *env = &cpu->env;
+
+ cpu->cfg.mmu = true;
+
/* We set this in the realise function */
riscv_cpu_set_misa(env, MXL_RV64, 0);
/* Set latest version of privileged specification */
@@ -542,13 +548,18 @@ static void rv64_veyron_v1_cpu_init(Object *obj)
static void rv128_base_cpu_init(Object *obj)
{
+ RISCVCPU *cpu = RISCV_CPU(obj);
+ CPURISCVState *env = &cpu->env;
+
if (qemu_tcg_mttcg_enabled()) {
/* Missing 128-bit aligned atomics */
error_report("128-bit RISC-V currently does not work with Multi "
"Threaded TCG. Please use: -accel tcg,thread=single");
exit(EXIT_FAILURE);
}
- CPURISCVState *env = &RISCV_CPU(obj)->env;
+
+ cpu->cfg.mmu = true;
+
/* We set this in the realise function */
riscv_cpu_set_misa(env, MXL_RV128, 0);
/* Set latest version of privileged specification */
@@ -560,7 +571,11 @@ static void rv128_base_cpu_init(Object *obj)
#else
static void rv32_base_cpu_init(Object *obj)
{
- CPURISCVState *env = &RISCV_CPU(obj)->env;
+ RISCVCPU *cpu = RISCV_CPU(obj);
+ CPURISCVState *env = &cpu->env;
+
+ cpu->cfg.mmu = true;
+
/* We set this in the realise function */
riscv_cpu_set_misa(env, MXL_RV32, 0);
/* Set latest version of privileged specification */
@@ -1431,6 +1446,19 @@ const RISCVCPUMultiExtConfig riscv_cpu_deprecated_exts[] = {
DEFINE_PROP_END_OF_LIST(),
};
+static bool riscv_cpu_is_vendor(Object *obj)
+{
+ return !riscv_cpu_is_generic(obj);
+}
+
+static void cpu_set_prop_err(RISCVCPU *cpu, const char *propname,
+ Error **errp)
+{
+ g_autofree char *cpuname = riscv_cpu_get_name(cpu);
+ error_setg(errp, "CPU '%s' does not allow changing the value of '%s'",
+ cpuname, propname);
+}
+
static void prop_pmu_num_set(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
@@ -1468,8 +1496,37 @@ const PropertyInfo prop_pmu_num = {
.set = prop_pmu_num_set,
};
+static void prop_mmu_set(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ RISCVCPU *cpu = RISCV_CPU(obj);
+ bool value;
+
+ visit_type_bool(v, name, &value, errp);
+
+ if (cpu->cfg.mmu != value && riscv_cpu_is_vendor(obj)) {
+ cpu_set_prop_err(cpu, "mmu", errp);
+ return;
+ }
+
+ cpu->cfg.mmu = value;
+}
+
+static void prop_mmu_get(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ bool value = RISCV_CPU(obj)->cfg.mmu;
+
+ visit_type_bool(v, name, &value, errp);
+}
+
+const PropertyInfo prop_mmu = {
+ .name = "mmu",
+ .get = prop_mmu_get,
+ .set = prop_mmu_set,
+};
+
Property riscv_cpu_options[] = {
- DEFINE_PROP_BOOL("mmu", RISCVCPU, cfg.mmu, true),
DEFINE_PROP_BOOL("pmp", RISCVCPU, cfg.pmp, true),
DEFINE_PROP_STRING("priv_spec", RISCVCPU, cfg.priv_spec),
@@ -1491,6 +1548,8 @@ static Property riscv_cpu_properties[] = {
MAKE_64BIT_MASK(3, 16)),
{.name = "pmu-num", .info = &prop_pmu_num}, /* Deprecated */
+ {.name = "mmu", .info = &prop_mmu},
+
#ifndef CONFIG_USER_ONLY
DEFINE_PROP_UINT64("resetvec", RISCVCPU, env.resetvec, DEFAULT_RSTVEC),
#endif
Commit 7f0bdfb5bfc ("target/riscv/cpu.c: remove cfg setup from riscv_cpu_init()") already did some of the work by making some cpu_init() functions to explictly enable their own 'mmu' default. The generic CPUs didn't get update by that commit, so they are still relying on the defaults set by the 'mmu' option. But having 'mmu' and 'pmp' being default=true will force CPUs that doesn't implement these options to set them to 'false' in their cpu_init(), which isn't ideal. We'll move 'mmu' to riscv_cpu_properties[] without any defaults, i.e. the default will be 'false'. Compensate it by manually setting 'mmu = true' to the generic CPUs that requires it. Implement a setter for it to forbid the 'mmu' setting to be changed for vendor CPUs. This will allow the option to exist for all CPUs and, at the same time, protect vendor CPUs from undesired changes: $ ./build/qemu-system-riscv64 -M virt -cpu sifive-e51,mmu=true qemu-system-riscv64: can't apply global sifive-e51-riscv-cpu.mmu=true: CPU 'sifive-e51' does not allow changing the value of 'mmu' Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> --- target/riscv/cpu.c | 67 +++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 63 insertions(+), 4 deletions(-)