Re: [PATCH v14 3/6] KVM: s390: pv: add KVM_CAP_S390_PROTECTED_ASYNC_DISABLE

[Janosch Frank <frankja@linux.ibm.com>]

On 10/10/22 14:15, Claudio Imbrenda wrote:
> On Mon, 10 Oct 2022 13:45:54 +0200
> Janosch Frank <frankja@linux.ibm.com> wrote:
> 
>> On 9/30/22 16:01, Claudio Imbrenda wrote:
>>> Add KVM_CAP_S390_PROTECTED_ASYNC_DISABLE to signal that the
>>> KVM_PV_ASYNC_DISABLE and KVM_PV_ASYNC_DISABLE_PREPARE commands for the
>>> KVM_S390_PV_COMMAND ioctl are available.
>>>
>>> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
>>> Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
>>> ---
>>>    arch/s390/kvm/kvm-s390.c | 3 +++
>>>    include/uapi/linux/kvm.h | 1 +
>>>    2 files changed, 4 insertions(+)
>>>
>>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
>>> index d0027964a6f5..7a3bd68efd85 100644
>>> --- a/arch/s390/kvm/kvm-s390.c
>>> +++ b/arch/s390/kvm/kvm-s390.c
>>> @@ -618,6 +618,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
>>>    	case KVM_CAP_S390_BPB:
>>>    		r = test_facility(82);
>>>    		break;
>>> +	case KVM_CAP_S390_PROTECTED_ASYNC_DISABLE:
>>> +		r = async_destroy && is_prot_virt_host();
>>> +		break;
>>>    	case KVM_CAP_S390_PROTECTED:
>>>    		r = is_prot_virt_host();
>>>    		break;
>>> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
>>> index 02602c5c1975..9afe0084b2c5 100644
>>> --- a/include/uapi/linux/kvm.h
>>> +++ b/include/uapi/linux/kvm.h
>>> @@ -1177,6 +1177,7 @@ struct kvm_ppc_resize_hpt {
>>>    #define KVM_CAP_VM_DISABLE_NX_HUGE_PAGES 220
>>>    #define KVM_CAP_S390_ZPCI_OP 221
>>>    #define KVM_CAP_S390_CPU_TOPOLOGY 222
>>> +#define KVM_CAP_S390_PROTECTED_ASYNC_DISABLE 225
>>
>> I can see 223 in Paolo's next, is there a 224 that I've missed?
> 
> no, I set this to an arbitrarily high value to avoid conficts
> 
> seems like I got it more or less right :)
> 
> feel free to change the value of the macro when merging, so it's
> contiguous.

Reviewed-by: Janosch Frank <frankja@linux.ibm.com>