[PATCH v10 02/24] KVM: Move architecture capability Kconfigs to header defines

[Steffen Eiden]

On Tue, Oct 13, 2026 at 02:13:43PM +0200, Steffen Eiden wrote:
> With s390 hosting multiple independent KVM implementations within the
> same kernel build (native s390 KVM and arm64 on s390), global Kconfig
> selections force both implementations to inherit options that only apply
> to one of them.
> 
> Replace global Kconfig options which only apply to one KVM
> implementation with architecture-specific opt-in defines in the
> respective <asm/kvm_host.h>. Only remove Kconfig symbols that would be
> different on both s390 KVM implementations
> 
>   - __KVM_HAVE_INVALID_WAKEUPS		(formerly HAVE_KVM_INVALID_WAKEUPS)
>   - __KVM_HAVE_MSI			(formerly HAVE_KVM_MSI)
>   - __KVM_HAVE_NO_POLL			(formerly HAVE_KVM_NO_POLL)
>   - __KVM_HAVE_READONLY_MEM		(formerly HAVE_KVM_READONLY_MEM)
>   - __KVM_HAVE_VCPU_RUN_PID_CHANGE	(formerly HAVE_KVM_VCPU_RUN_PID_CHANGE)
> 
> This allows each architecture and guest implementation to configure its
> supported capabilities independently in its kvm_host header and eliminates
> adding unnecessary fallback stubs across different KVM targets.
> 
> Acked-by: Hendrik Brueckner <brueckner at linux.ibm.com>
> Signed-off-by: Steffen Eiden <seiden at linux.ibm.com>
> ---
> 
> Sending this patch alone. All others are OK or already picked.
> 
> Changes for v10:
>   - Use __KVM_HAVE_ as prefix
>   - Clarify that this patch touches only selected Kconfig options and
>     not all.

Paolo, 

Sorry, I somehow managed to not CC you, doing that now.

FWIW:
Original patch v10:
https://lore.kernel.org/all/20261013121343.1997112-1-seiden@linux.ibm.com/

	Steffen