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Subject: Re: [PATCH v9 18/22] s390: vfio-ap: implement VFIO_DEVICE_RESET ioctl
To:     Cornelia Huck <cohuck@redhat.com>,
        Tony Krowiak <akrowiak@linux.vnet.ibm.com>
Cc:     linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, freude@de.ibm.com, schwidefsky@de.ibm.com,
        heiko.carstens@de.ibm.com, borntraeger@de.ibm.com,
        kwankhede@nvidia.com, bjsdjshi@linux.vnet.ibm.com,
        pbonzini@redhat.com, alex.williamson@redhat.com,
        pmorel@linux.vnet.ibm.com, alifm@linux.vnet.ibm.com,
        mjrosato@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com,
        thuth@redhat.com, pasic@linux.vnet.ibm.com, berrange@redhat.com,
        fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com,
        frankja@linux.ibm.com
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 <20180815183835.66470bc6.cohuck@redhat.com>
From:   Tony Krowiak <akrowiak@linux.ibm.com>
Date:   Wed, 15 Aug 2018 17:05:48 -0400
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On 08/15/2018 12:38 PM, Cornelia Huck wrote:
> On Mon, 13 Aug 2018 17:48:15 -0400
> Tony Krowiak <akrowiak@linux.vnet.ibm.com> wrote:
>
>> From: Tony Krowiak <akrowiak@linux.ibm.com>
>>
>> Implements the VFIO_DEVICE_RESET ioctl. This ioctl zeroizes
>> all of the AP queues assigned to the guest.
>>
>> Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
>> Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
>> Tested-by: Michael Mueller <mimu@linux.ibm.com>
>> Tested-by: Farhan Ali <alifm@linux.ibm.com>
>> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
>> Tested-by: Pierre Morel <pmorel@linux.ibm.com>
>> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
>> ---
>>   drivers/s390/crypto/vfio_ap_ops.c |    5 ++++-
>>   1 files changed, 4 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
>> index cc90323..d4a065b 100644
>> --- a/drivers/s390/crypto/vfio_ap_ops.c
>> +++ b/drivers/s390/crypto/vfio_ap_ops.c
>> @@ -832,7 +832,7 @@ static int vfio_ap_mdev_get_device_info(unsigned long arg)
>>   	if (info.argsz < minsz)
>>   		return -EINVAL;
>>   
>> -	info.flags = VFIO_DEVICE_FLAGS_AP;
>> +	info.flags = VFIO_DEVICE_FLAGS_AP | VFIO_DEVICE_FLAGS_RESET;
>>   	info.num_regions = 0;
>>   	info.num_irqs = 0;
>>   
>> @@ -848,6 +848,9 @@ static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
>>   	case VFIO_DEVICE_GET_INFO:
>>   		ret = vfio_ap_mdev_get_device_info(arg);
>>   		break;
>> +	case VFIO_DEVICE_RESET:
>> +		ret = vfio_ap_mdev_reset_queues(mdev, true);
> If I see it correctly, you call this function only ever with force ==
> true (here and in the previous patch). Is that what you intended?

That does seem to be the case now; however, I think at one time there were
additional calls to this function. For some reason of which I am not aware,
those were removed, so there is probably no need for it now.

>
>> +		break;
>>   	default:
>>   		ret = -EOPNOTSUPP;
>>   		break;