On Thu, 9 Nov 2017 10:04:04 +0100
Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote:
> The AIS capability was introduced in 4.12, while the interface
> to migrate the state was added in 4.13. Let's add a new capability
> that tells userspace that AIS states can be migrated.
I think that needs a bit more explanation (i.e., why can't userspace
check for the migration interface?) Also, it would be good to mention
the cap under Documentation/.
[It's very likely that we will have forgotten the history of this in
in a few month's time...]
>
> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> ---
> arch/s390/kvm/kvm-s390.c | 1 +
> include/uapi/linux/kvm.h | 1 +
> 2 files changed, 2 insertions(+)
>
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index de6a5b7..8f4b655 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -395,6 +395,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
> case KVM_CAP_S390_USER_INSTR0:
> case KVM_CAP_S390_CMMA_MIGRATION:
> case KVM_CAP_S390_AIS:
> + case KVM_CAP_S390_AIS_MIGRATION:
> r = 1;
> break;
> case KVM_CAP_S390_MEM_OP:
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 8388875..b605956 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -930,6 +930,7 @@ struct kvm_ppc_resize_hpt {
> #define KVM_CAP_PPC_SMT_POSSIBLE 147
> #define KVM_CAP_HYPERV_SYNIC2 148
> #define KVM_CAP_HYPERV_VP_INDEX 149
> +#define KVM_CAP_S390_AIS_MIGRATION 150
>
> #ifdef KVM_CAP_IRQ_ROUTING
>
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