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

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Date:   Wed, 15 Aug 2018 18:38:35 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     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, Tony Krowiak <akrowiak@...ux.ibm.com>
Subject: Re: [PATCH v9 18/22] s390: vfio-ap: implement VFIO_DEVICE_RESET
 ioctl

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?

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