Re: [Qemu-devel] [PATCH 22/23] target-arm: Enable EL2 feature bit on A53 and A57

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

On Tue, Dec 13, 2016 at 10:36:23AM +0000, Peter Maydell wrote:
> Enable the ARM_FEATURE_EL2 bit on Cortex-A52 and
> Cortex-A57, since this is all now sufficiently implemented
> to work with the GICv3. We provide the usual CPU property
> to disable it for backwards compatibility with the older
> virt boards.
> 
> In this commit, we disable the EL2 feature on the
> virt and ZynpMP boards, so there is no overall effect.
> Another commit will expose a board-level property to
> allow the user to enable EL2.

Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>


> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>  target-arm/cpu.h     |  2 ++
>  hw/arm/virt.c        |  4 ++++
>  hw/arm/xlnx-zynqmp.c |  2 ++
>  target-arm/cpu.c     | 12 ++++++++++++
>  target-arm/cpu64.c   |  2 ++
>  5 files changed, 22 insertions(+)
> 
> diff --git a/target-arm/cpu.h b/target-arm/cpu.h
> index be42ffb..51165fa 100644
> --- a/target-arm/cpu.h
> +++ b/target-arm/cpu.h
> @@ -574,6 +574,8 @@ struct ARMCPU {
>      bool start_powered_off;
>      /* CPU currently in PSCI powered-off state */
>      bool powered_off;
> +    /* CPU has virtualization extension */
> +    bool has_el2;
>      /* CPU has security extension */
>      bool has_el3;
>      /* CPU has PMU (Performance Monitor Unit) */
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index cce8d2e..5bde68c 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -1368,6 +1368,10 @@ static void machvirt_init(MachineState *machine)
>              object_property_set_bool(cpuobj, false, "has_el3", NULL);
>          }
>  
> +        if (object_property_find(cpuobj, "has_el2", NULL)) {
> +            object_property_set_bool(cpuobj, false, "has_el2", NULL);
> +        }
> +
>          if (vms->psci_conduit != QEMU_PSCI_CONDUIT_DISABLED) {
>              object_property_set_int(cpuobj, vms->psci_conduit,
>                                      "psci-conduit", NULL);
> diff --git a/hw/arm/xlnx-zynqmp.c b/hw/arm/xlnx-zynqmp.c
> index 0d86ba3..bc4e66b 100644
> --- a/hw/arm/xlnx-zynqmp.c
> +++ b/hw/arm/xlnx-zynqmp.c
> @@ -258,6 +258,8 @@ static void xlnx_zynqmp_realize(DeviceState *dev, Error **errp)
>  
>          object_property_set_bool(OBJECT(&s->apu_cpu[i]),
>                                   s->secure, "has_el3", NULL);
> +        object_property_set_bool(OBJECT(&s->apu_cpu[i]),
> +                                 false, "has_el2", NULL);
>          object_property_set_int(OBJECT(&s->apu_cpu[i]), GIC_BASE_ADDR,
>                                  "reset-cbar", &error_abort);
>          object_property_set_bool(OBJECT(&s->apu_cpu[i]), true, "realized",
> diff --git a/target-arm/cpu.c b/target-arm/cpu.c
> index 5e0d21d..d721cd4 100644
> --- a/target-arm/cpu.c
> +++ b/target-arm/cpu.c
> @@ -497,6 +497,9 @@ static Property arm_cpu_reset_hivecs_property =
>  static Property arm_cpu_rvbar_property =
>              DEFINE_PROP_UINT64("rvbar", ARMCPU, rvbar, 0);
>  
> +static Property arm_cpu_has_el2_property =
> +            DEFINE_PROP_BOOL("has_el2", ARMCPU, has_el2, true);
> +
>  static Property arm_cpu_has_el3_property =
>              DEFINE_PROP_BOOL("has_el3", ARMCPU, has_el3, true);
>  
> @@ -547,6 +550,11 @@ static void arm_cpu_post_init(Object *obj)
>  #endif
>      }
>  
> +    if (arm_feature(&cpu->env, ARM_FEATURE_EL2)) {
> +        qdev_property_add_static(DEVICE(obj), &arm_cpu_has_el2_property,
> +                                 &error_abort);
> +    }
> +
>      if (arm_feature(&cpu->env, ARM_FEATURE_PMU)) {
>          qdev_property_add_static(DEVICE(obj), &arm_cpu_has_pmu_property,
>                                   &error_abort);
> @@ -690,6 +698,10 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
>          cpu->id_aa64pfr0 &= ~0xf000;
>      }
>  
> +    if (!cpu->has_el2) {
> +        unset_feature(env, ARM_FEATURE_EL2);
> +    }
> +
>      if (!cpu->has_pmu || !kvm_enabled()) {
>          cpu->has_pmu = false;
>          unset_feature(env, ARM_FEATURE_PMU);
> diff --git a/target-arm/cpu64.c b/target-arm/cpu64.c
> index 73c7f31..670c07a 100644
> --- a/target-arm/cpu64.c
> +++ b/target-arm/cpu64.c
> @@ -110,6 +110,7 @@ static void aarch64_a57_initfn(Object *obj)
>      set_feature(&cpu->env, ARM_FEATURE_V8_SHA256);
>      set_feature(&cpu->env, ARM_FEATURE_V8_PMULL);
>      set_feature(&cpu->env, ARM_FEATURE_CRC);
> +    set_feature(&cpu->env, ARM_FEATURE_EL2);
>      set_feature(&cpu->env, ARM_FEATURE_EL3);
>      set_feature(&cpu->env, ARM_FEATURE_PMU);
>      cpu->kvm_target = QEMU_KVM_ARM_TARGET_CORTEX_A57;
> @@ -169,6 +170,7 @@ static void aarch64_a53_initfn(Object *obj)
>      set_feature(&cpu->env, ARM_FEATURE_V8_SHA256);
>      set_feature(&cpu->env, ARM_FEATURE_V8_PMULL);
>      set_feature(&cpu->env, ARM_FEATURE_CRC);
> +    set_feature(&cpu->env, ARM_FEATURE_EL2);
>      set_feature(&cpu->env, ARM_FEATURE_EL3);
>      set_feature(&cpu->env, ARM_FEATURE_PMU);
>      cpu->kvm_target = QEMU_KVM_ARM_TARGET_CORTEX_A53;
> -- 
> 2.7.4
>