[PATCH] KVM: arm64: Enforce dependency on an ARMv8.4-aware toolchain

[Viresh Kumar]

On 07-08-24, 12:51, Marc Zyngier wrote:
> With the NV support of TLBI-range operations, KVM makes use of
> instructions that are only supported by binutils versions >= 2.30.
> 
> This breaks the build for very old toolchains.
> 
> Make KVM support conditional on having ARMv8.4 support in the
> assembler, side-stepping the issue.
> 
> Fixes: 5d476ca57d7d ("KVM: arm64: nv: Add handling of range-based TLBI operations")
> Reported-by: Viresh Kumar <viresh.kumar at linaro.org>
> Suggested-by: Arnd Bergmann <arnd at linaro.org>
> Signed-off-by: Marc Zyngier <maz at kernel.org>
> ---
>  arch/arm64/kvm/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
> index 58f09370d17e..8304eb342be9 100644
> --- a/arch/arm64/kvm/Kconfig
> +++ b/arch/arm64/kvm/Kconfig
> @@ -19,6 +19,7 @@ if VIRTUALIZATION
>  
>  menuconfig KVM
>  	bool "Kernel-based Virtual Machine (KVM) support"
> +	depends on AS_HAS_ARMV8_4
>  	select KVM_COMMON
>  	select KVM_GENERIC_HARDWARE_ENABLING
>  	select KVM_GENERIC_MMU_NOTIFIER

Tested-by: Viresh Kumar <viresh.kumar at linaro.org>

(Build only).

-- 
viresh