Re: [PATCH v3 10/19] target/arm: Restrict ARMv4 cpus to TCG accel

[Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>]

On 3/16/20 5:06 PM, Philippe Mathieu-Daudé wrote:
> KVM requires a cpu based on (at least) the ARMv7 architecture.
>
> Only enable the following ARMv4 CPUs when TCG is available:
>
>    - StrongARM (SA1100/1110)
>    - OMAP1510 (TI925T)

I missed to explain, the point of this Kconfig granularity is on a KVM 
only build, the TCG-only CPUs can't be default-selected, so most of 
their devices are not pulled in.

Instead at the end the KVM-only binary only contains the devices 
required to run the Cortex-A machines.

> diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
> index 8b89d8c4c0..0652396296 100644
> --- a/default-configs/arm-softmmu.mak
> +++ b/default-configs/arm-softmmu.mak
> @@ -17,8 +17,6 @@ CONFIG_INTEGRATOR=y
>   CONFIG_FSL_IMX31=y
>   CONFIG_MUSICPAL=y
>   CONFIG_MUSCA=y
> -CONFIG_CHEETAH=y
> -CONFIG_SX1=y
>   CONFIG_NSERIES=y
>   CONFIG_STELLARIS=y
>   CONFIG_REALVIEW=y
[...]
> diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
> index e3d7e7694a..7fc0cff776 100644
> --- a/hw/arm/Kconfig
> +++ b/hw/arm/Kconfig
> @@ -28,6 +28,7 @@ config ARM_VIRT
>   
>   config CHEETAH
>       bool
> +    select ARM_V4
>       select OMAP
>       select TSC210X
>   
> @@ -242,6 +243,7 @@ config COLLIE
>   
>   config SX1
>       bool
> +    select ARM_V4
>       select OMAP
>   
>   config VERSATILE
> diff --git a/target/arm/Kconfig b/target/arm/Kconfig
> index e68c71a6ff..0d496d318a 100644
> --- a/target/arm/Kconfig
> +++ b/target/arm/Kconfig
> @@ -1,2 +1,6 @@
> +config ARM_V4
> +    depends on TCG
> +    bool
> +
>   config ARM_V7M
>       bool