linux-kernel - Re: [PATCH v9 18/22] s390: vfio-ap: implement VFIO_DEVICE

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Date:   Wed, 15 Aug 2018 17:05:48 -0400
From:   Tony Krowiak <akrowiak@...ux.ibm.com>
To:     Cornelia Huck <cohuck@...hat.com>,
        Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        kwankhede@...dia.com, bjsdjshi@...ux.vnet.ibm.com,
        pbonzini@...hat.com, alex.williamson@...hat.com,
        pmorel@...ux.vnet.ibm.com, alifm@...ux.vnet.ibm.com,
        mjrosato@...ux.vnet.ibm.com, jjherne@...ux.vnet.ibm.com,
        thuth@...hat.com, pasic@...ux.vnet.ibm.com, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com,
        frankja@...ux.ibm.com
Subject: Re: [PATCH v9 18/22] s390: vfio-ap: implement VFIO_DEVICE_RESET ioctl

On 08/15/2018 12:38 PM, Cornelia Huck wrote:
> On Mon, 13 Aug 2018 17:48:15 -0400
> Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:
>
>> From: Tony Krowiak <akrowiak@...ux.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@...ux.ibm.com>
>> Reviewed-by: Halil Pasic <pasic@...ux.ibm.com>
>> Tested-by: Michael Mueller <mimu@...ux.ibm.com>
>> Tested-by: Farhan Ali <alifm@...ux.ibm.com>
>> Reviewed-by: Pierre Morel <pmorel@...ux.ibm.com>
>> Tested-by: Pierre Morel <pmorel@...ux.ibm.com>
>> Signed-off-by: Christian Borntraeger <borntraeger@...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;