Subject: Re: [PATCH 03/10] KVM: PPC: reserve a capability and ioctl numbers for realmode VFIO

From: Alexey Kardashevskiy <[email-masked]>
Date: Thu, 15 Aug 2013 17:42:25 +1000

On 08/15/2013 05:25 PM, Alexander Graf wrote:
> 
> On 15.08.2013, at 09:24, Alexander Graf wrote:
> 
>>
>> On 15.08.2013, at 09:22, Alexey Kardashevskiy wrote:
>>
>>> On 08/15/2013 05:16 PM, Alexander Graf wrote:
>>>>
>>>> On 01.08.2013, at 06:44, Alexey Kardashevskiy wrote:
>>>>
>>>>> This is to reserve a capablity number for upcoming support
>>>>> of VFIO-IOMMU DMA operations in real mode.
>>>>>
>>>>> Signed-off-by: Alexey Kardashevskiy <[email-masked]>
>>>>>
>>>>> ---
>>>>> Changes:
>>>>> 2013/07/16:
>>>>> * changed the number
>>>>>
>>>>> 2013/07/11:
>>>>> * changed order in a file, added comment about a gap in ioctl number
>>>>>
>>>>> Signed-off-by: Alexey Kardashevskiy <[email-masked]>
>>>>> ---
>>>>> include/uapi/linux/kvm.h | 4 ++++
>>>>> 1 file changed, 4 insertions(+)
>>>>>
>>>>> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
>>>>> index 99c2533..53c3f1f 100644
>>>>> --- a/include/uapi/linux/kvm.h
>>>>> +++ b/include/uapi/linux/kvm.h
>>>>> @@ -668,6 +668,7 @@ struct kvm_ppc_smmu_info {
>>>>> #define KVM_CAP_IRQ_XICS 92
>>>>> #define KVM_CAP_ARM_EL1_32BIT 93
>>>>> #define KVM_CAP_SPAPR_MULTITCE 94
>>>>> +#define KVM_CAP_SPAPR_TCE_IOMMU 95
>>>>>
>>>>> #ifdef KVM_CAP_IRQ_ROUTING
>>>>>
>>>>> @@ -933,6 +934,9 @@ struct kvm_s390_ucas_mapping {
>>>>> #define KVM_ARM_SET_DEVICE_ADDR	  _IOW(KVMIO,  0xab, struct kvm_arm_device_addr)
>>>>> /* Available with KVM_CAP_PPC_RTAS */
>>>>> #define KVM_PPC_RTAS_DEFINE_TOKEN _IOW(KVMIO,  0xac, struct kvm_rtas_token_args)
>>>>> +/* 0xad and 0xaf are already taken */
>>>>
>>>> so 0xad and 0xaf are already taken? where?
>>>
>>> Mistype :( s/af/ae/
>>>
>>> They are taken in this file:
>>>
>>> 1016 /* VM is being stopped by host */
>>> 1017 #define KVM_KVMCLOCK_CTRL         _IO(KVMIO,   0xad)
>>> 1018 #define KVM_ARM_VCPU_INIT         _IOW(KVMIO,  0xae, struct kvm_vcpu_init)
>>
>> Could you please make sure that whoever reads the comment in a year still knows where to look? :)
> 
> Something like
> 
>   /* 0xad is taken by KVM_KVMCLOCK_CTRL */
>   /* 0xaf is taken by KVM_ARM_VCPU_INIT */

Missed this mail and reposted without this comment but updated commit
message saying where they are used. Repost again?

-- 
Alexey