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authorAndrew Jones <drjones@redhat.com>2019-10-24 14:18:02 +0200
committerPeter Maydell <peter.maydell@linaro.org>2019-10-24 17:16:29 +0100
commit8def1d2c1f1afcd4883bc95db81ccbe121343d9d (patch)
tree6d6f078490c7132cfd4e254942f5151bcd69104e
parent7e719039540797715296a595fd20bd4dffdd5a5c (diff)
downloadqemu-arm-8def1d2c1f1afcd4883bc95db81ccbe121343d9d.tar.gz
target/arm: Allow SVE to be disabled via a CPU property
Since 97a28b0eeac14 ("target/arm: Allow VFP and Neon to be disabled via a CPU property") we can disable the 'max' cpu model's VFP and neon features, but there's no way to disable SVE. Add the 'sve=on|off' property to give it that flexibility. We also rename cpu_max_get/set_sve_vq to cpu_max_get/set_sve_max_vq in order for them to follow the typical *_get/set_<property-name> pattern. Signed-off-by: Andrew Jones <drjones@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Eric Auger <eric.auger@redhat.com> Tested-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Reviewed-by: Beata Michalska <beata.michalska@linaro.org> Message-id: 20191024121808.9612-4-drjones@redhat.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r--target/arm/cpu.c3
-rw-r--r--target/arm/cpu64.c52
-rw-r--r--target/arm/monitor.c2
-rw-r--r--tests/arm-cpu-features.c1
4 files changed, 49 insertions, 9 deletions
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index ab3e1a0361..72a27ec4b0 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -200,7 +200,8 @@ static void arm_cpu_reset(CPUState *s)
env->cp15.cpacr_el1 = deposit64(env->cp15.cpacr_el1, 16, 2, 3);
env->cp15.cptr_el[3] |= CPTR_EZ;
/* with maximum vector length */
- env->vfp.zcr_el[1] = cpu->sve_max_vq - 1;
+ env->vfp.zcr_el[1] = cpu_isar_feature(aa64_sve, cpu) ?
+ cpu->sve_max_vq - 1 : 0;
env->vfp.zcr_el[2] = env->vfp.zcr_el[1];
env->vfp.zcr_el[3] = env->vfp.zcr_el[1];
/*
diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c
index d7f5bf610a..89a8ae77fe 100644
--- a/target/arm/cpu64.c
+++ b/target/arm/cpu64.c
@@ -256,15 +256,23 @@ static void aarch64_a72_initfn(Object *obj)
define_arm_cp_regs(cpu, cortex_a72_a57_a53_cp_reginfo);
}
-static void cpu_max_get_sve_vq(Object *obj, Visitor *v, const char *name,
- void *opaque, Error **errp)
+static void cpu_max_get_sve_max_vq(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
{
ARMCPU *cpu = ARM_CPU(obj);
- visit_type_uint32(v, name, &cpu->sve_max_vq, errp);
+ uint32_t value;
+
+ /* All vector lengths are disabled when SVE is off. */
+ if (!cpu_isar_feature(aa64_sve, cpu)) {
+ value = 0;
+ } else {
+ value = cpu->sve_max_vq;
+ }
+ visit_type_uint32(v, name, &value, errp);
}
-static void cpu_max_set_sve_vq(Object *obj, Visitor *v, const char *name,
- void *opaque, Error **errp)
+static void cpu_max_set_sve_max_vq(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
{
ARMCPU *cpu = ARM_CPU(obj);
Error *err = NULL;
@@ -279,6 +287,34 @@ static void cpu_max_set_sve_vq(Object *obj, Visitor *v, const char *name,
error_propagate(errp, err);
}
+static void cpu_arm_get_sve(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ ARMCPU *cpu = ARM_CPU(obj);
+ bool value = cpu_isar_feature(aa64_sve, cpu);
+
+ visit_type_bool(v, name, &value, errp);
+}
+
+static void cpu_arm_set_sve(Object *obj, Visitor *v, const char *name,
+ void *opaque, Error **errp)
+{
+ ARMCPU *cpu = ARM_CPU(obj);
+ Error *err = NULL;
+ bool value;
+ uint64_t t;
+
+ visit_type_bool(v, name, &value, &err);
+ if (err) {
+ error_propagate(errp, err);
+ return;
+ }
+
+ t = cpu->isar.id_aa64pfr0;
+ t = FIELD_DP64(t, ID_AA64PFR0, SVE, value);
+ cpu->isar.id_aa64pfr0 = t;
+}
+
/* -cpu max: if KVM is enabled, like -cpu host (best possible with this host);
* otherwise, a CPU with as many features enabled as our emulation supports.
* The version of '-cpu max' for qemu-system-arm is defined in cpu.c;
@@ -391,8 +427,10 @@ static void aarch64_max_initfn(Object *obj)
#endif
cpu->sve_max_vq = ARM_MAX_VQ;
- object_property_add(obj, "sve-max-vq", "uint32", cpu_max_get_sve_vq,
- cpu_max_set_sve_vq, NULL, NULL, &error_fatal);
+ object_property_add(obj, "sve-max-vq", "uint32", cpu_max_get_sve_max_vq,
+ cpu_max_set_sve_max_vq, NULL, NULL, &error_fatal);
+ object_property_add(obj, "sve", "bool", cpu_arm_get_sve,
+ cpu_arm_set_sve, NULL, NULL, &error_fatal);
}
}
diff --git a/target/arm/monitor.c b/target/arm/monitor.c
index 560970de7f..2209b27b9a 100644
--- a/target/arm/monitor.c
+++ b/target/arm/monitor.c
@@ -97,7 +97,7 @@ GICCapabilityList *qmp_query_gic_capabilities(Error **errp)
* then the order that considers those dependencies must be used.
*/
static const char *cpu_model_advertised_features[] = {
- "aarch64", "pmu",
+ "aarch64", "pmu", "sve",
NULL
};
diff --git a/tests/arm-cpu-features.c b/tests/arm-cpu-features.c
index c59fcf409c..6342cd2e4e 100644
--- a/tests/arm-cpu-features.c
+++ b/tests/arm-cpu-features.c
@@ -179,6 +179,7 @@ static void test_query_cpu_model_expansion(const void *data)
if (g_str_equal(qtest_get_arch(), "aarch64")) {
assert_has_feature(qts, "max", "aarch64");
+ assert_has_feature(qts, "max", "sve");
assert_has_feature(qts, "cortex-a57", "pmu");
assert_has_feature(qts, "cortex-a57", "aarch64");