linux-kernel - Re: [PATCH v4 2/2] vfio: no need to pass kvm pointer during device open

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Message-ID: <1bd635d4-3868-6c6e-48a7-9888a1f4770f@linux.ibm.com>
Date:   Mon, 6 Feb 2023 09:30:52 -0500
From:   Anthony Krowiak <akrowiak@...ux.ibm.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>,
        alex.williamson@...hat.com, pbonzini@...hat.com,
        yi.l.liu@...el.com, jgg@...dia.com
Cc:     cohuck@...hat.com, farman@...ux.ibm.com, pmorel@...ux.ibm.com,
        borntraeger@...ux.ibm.com, frankja@...ux.ibm.com,
        imbrenda@...ux.ibm.com, david@...hat.com, jjherne@...ux.ibm.com,
        pasic@...ux.ibm.com, zhenyuw@...ux.intel.com, zhi.a.wang@...el.com,
        seanjc@...gle.com, kevin.tian@...el.com,
        linux-s390@...r.kernel.org, kvm@...r.kernel.org,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] vfio: no need to pass kvm pointer during device
 open

Tested-by: Tony Krowiak <akrowiak@...ux.ibm.com>

On 2/3/23 4:50 PM, Matthew Rosato wrote:
> Nothing uses this value during vfio_device_open anymore so it's safe
> to remove it.
>
> Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
> ---
>   drivers/vfio/group.c     | 2 +-
>   drivers/vfio/vfio.h      | 3 +--
>   drivers/vfio/vfio_main.c | 7 +++----
>   3 files changed, 5 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/vfio/group.c b/drivers/vfio/group.c
> index 98621ac082f0..0e9036e2b9c4 100644
> --- a/drivers/vfio/group.c
> +++ b/drivers/vfio/group.c
> @@ -187,7 +187,7 @@ static int vfio_device_group_open(struct vfio_device *device)
>   	if (device->open_count == 0)
>   		vfio_device_group_get_kvm_safe(device);
>   
> -	ret = vfio_device_open(device, device->group->iommufd, device->kvm);
> +	ret = vfio_device_open(device, device->group->iommufd);
>   
>   	if (device->open_count == 0)
>   		vfio_device_put_kvm(device);
> diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h
> index 24d6cd285945..4f39ab549a80 100644
> --- a/drivers/vfio/vfio.h
> +++ b/drivers/vfio/vfio.h
> @@ -18,8 +18,7 @@ struct vfio_container;
>   
>   void vfio_device_put_registration(struct vfio_device *device);
>   bool vfio_device_try_get_registration(struct vfio_device *device);
> -int vfio_device_open(struct vfio_device *device,
> -		     struct iommufd_ctx *iommufd, struct kvm *kvm);
> +int vfio_device_open(struct vfio_device *device, struct iommufd_ctx *iommufd);
>   void vfio_device_close(struct vfio_device *device,
>   		       struct iommufd_ctx *iommufd);
>   
> diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
> index 28c47cd6a6b5..3a597e799918 100644
> --- a/drivers/vfio/vfio_main.c
> +++ b/drivers/vfio/vfio_main.c
> @@ -397,7 +397,7 @@ static bool vfio_assert_device_open(struct vfio_device *device)
>   }
>   
>   static int vfio_device_first_open(struct vfio_device *device,
> -				  struct iommufd_ctx *iommufd, struct kvm *kvm)
> +				  struct iommufd_ctx *iommufd)
>   {
>   	int ret;
>   
> @@ -444,8 +444,7 @@ static void vfio_device_last_close(struct vfio_device *device,
>   	module_put(device->dev->driver->owner);
>   }
>   
> -int vfio_device_open(struct vfio_device *device,
> -		     struct iommufd_ctx *iommufd, struct kvm *kvm)
> +int vfio_device_open(struct vfio_device *device, struct iommufd_ctx *iommufd)
>   {
>   	int ret = 0;
>   
> @@ -453,7 +452,7 @@ int vfio_device_open(struct vfio_device *device,
>   
>   	device->open_count++;
>   	if (device->open_count == 1) {
> -		ret = vfio_device_first_open(device, iommufd, kvm);
> +		ret = vfio_device_first_open(device, iommufd);
>   		if (ret)
>   			device->open_count--;
>   	}