Re: [PATCH 2/2] s390: kvm: arm64: add HAS_IOMEM dependency

[Steffen Eiden <seiden@linux.ibm.com>]

On Tue, May 26, 2026 at 02:52:20PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The arm64 kvm driver can only be enabled when MMIO support is part of
> the host kernel:
> 
> arch/s390/kvm/arm64/../../../../virt/kvm/arm64/mmio.c:120:27: error: 'struct kvm_vcpu' has no member named 'mmio_needed'
> 
> s390 does not support MMIO if PCI is disabled, but in practice one
> would not actually need kvm support in those configurations either.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> This is currently needed for randconfig build testing the
> 'sae' branch, it is not yet in linux-next
> ---
>  arch/s390/kvm/arm64/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/s390/kvm/arm64/Kconfig b/arch/s390/kvm/arm64/Kconfig
> index 42a1be50f6e1..65b9dc25fe62 100644
> --- a/arch/s390/kvm/arm64/Kconfig
> +++ b/arch/s390/kvm/arm64/Kconfig
> @@ -3,6 +3,7 @@
>  config KVM_ARM64
>  	def_tristate y
>  	prompt "Kernel-based Virtual Machine (KVM) support for arm64 guests"
> +	depends on HAS_IOMEM
>  	select KVM
>  	select KVM_VFIO
>  	select IRQ_BYPASS_MANAGER
> -- 
> 2.39.5
>

Thank you, 

I would squash this in v3 into the patch that creates this config:
KVM: s390: arm64: Enable KVM_ARM64 config and Kbuild

if that is OK for you.

	Steffen