linux-kernel - Re: [PATCH V2 2/3] kvm: don't register wildcard MMIO EVENTFD on two buses

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Date:	Tue, 25 Aug 2015 17:06:32 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
CC:	gleb@...nel.org, pbonzini@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH V2 2/3] kvm: don't register wildcard MMIO EVENTFD on two
 buses



On 08/25/2015 04:20 PM, Cornelia Huck wrote:
> On Tue, 25 Aug 2015 15:47:14 +0800
> Jason Wang <jasowang@...hat.com> wrote:
>
>> diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
>> index 9ff4193..95f2901 100644
>> --- a/virt/kvm/eventfd.c
>> +++ b/virt/kvm/eventfd.c
>> @@ -762,13 +762,15 @@ ioeventfd_check_collision(struct kvm *kvm, struct _ioeventfd *p)
>>  	return false;
>>  }
>>
>> -static enum kvm_bus ioeventfd_bus_from_flags(__u32 flags)
>> +static enum kvm_bus ioeventfd_bus_from_flags(struct kvm_ioeventfd *args)
> ioeventfd_bus_from_args()? But _from_flags() is not wrong either :)
>
>>  {
>> -	if (flags & KVM_IOEVENTFD_FLAG_PIO)
>> +	if (args->flags & KVM_IOEVENTFD_FLAG_PIO)
>>  		return KVM_PIO_BUS;
>> -	if (flags & KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY)
>> +	if (args->flags & KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY)
>>  		return KVM_VIRTIO_CCW_NOTIFY_BUS;
>> -	return KVM_MMIO_BUS;
>> +	if (args->len)
>> +		return KVM_MMIO_BUS;
>> +	return KVM_FAST_MMIO_BUS;
> Hm...
>
> /* When length is ignored, MMIO is put on a separate bus, for
>  * faster lookups.
>  */
> return args->len ? KVM_MMIO_BUS : KVM_FAST_MMIO_BUS;
>
>>  }
>>
>>  static int
> This version of the patch looks nice and compact. Regardless whether
> you want to follow my (minor) style suggestions, consider this patch
>
> Acked-by: Cornelia Huck <cornelia.huck@...ibm.com>
>

Thanks for the review. V3 posted :)
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