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Re: [PATCH v4 3/9] target/arm: Allow SVE to be disabled via a CPU proper
From: |
Auger Eric |
Subject: |
Re: [PATCH v4 3/9] target/arm: Allow SVE to be disabled via a CPU property |
Date: |
Tue, 24 Sep 2019 17:06:05 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 |
Hi Drew,
On 9/24/19 1:30 PM, Andrew Jones wrote:
> 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 <address@hidden>
> Reviewed-by: Richard Henderson <address@hidden>
Reviewed-by: Eric Auger <address@hidden>
Eric
> ---
> target/arm/cpu.c | 3 ++-
> target/arm/cpu64.c | 42 ++++++++++++++++++++++++++++++++++------
> target/arm/monitor.c | 2 +-
> tests/arm-cpu-features.c | 1 +
> 4 files changed, 40 insertions(+), 8 deletions(-)
>
> diff --git a/target/arm/cpu.c b/target/arm/cpu.c
> index 2399c144718d..73be2ebfdd39 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 d7f5bf610a7d..8cdb0c79fa7a 100644
> --- a/target/arm/cpu64.c
> +++ b/target/arm/cpu64.c
> @@ -256,15 +256,15 @@ 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);
> }
>
> -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 +279,34 @@ 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 +419,10 @@ 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 edca8aa885f0..4fddb6c252a3 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 198ff6d6b495..202bc0e3e823 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");
>
>
- [PATCH v4 0/9] target/arm/kvm: enable SVE in guests, Andrew Jones, 2019/09/24
- [PATCH v4 1/9] target/arm/monitor: Introduce qmp_query_cpu_model_expansion, Andrew Jones, 2019/09/24
- [PATCH v4 3/9] target/arm: Allow SVE to be disabled via a CPU property, Andrew Jones, 2019/09/24
- Re: [PATCH v4 3/9] target/arm: Allow SVE to be disabled via a CPU property,
Auger Eric <=
- [PATCH v4 2/9] tests: arm: Introduce cpu feature tests, Andrew Jones, 2019/09/24
- [PATCH v4 5/9] target/arm/kvm64: Add kvm_arch_get/put_sve, Andrew Jones, 2019/09/24
- [PATCH v4 4/9] target/arm/cpu64: max cpu: Introduce sve<N> properties, Andrew Jones, 2019/09/24