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

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Message-ID: <DS0PR11MB7529C0AF0C079748413999C3C3D49@DS0PR11MB7529.namprd11.prod.outlook.com>
Date:   Sat, 4 Feb 2023 06:23:51 +0000
From:   "Liu, Yi L" <yi.l.liu@...el.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.com>
CC:     "cohuck@...hat.com" <cohuck@...hat.com>,
        "farman@...ux.ibm.com" <farman@...ux.ibm.com>,
        "pmorel@...ux.ibm.com" <pmorel@...ux.ibm.com>,
        "borntraeger@...ux.ibm.com" <borntraeger@...ux.ibm.com>,
        "frankja@...ux.ibm.com" <frankja@...ux.ibm.com>,
        "imbrenda@...ux.ibm.com" <imbrenda@...ux.ibm.com>,
        "david@...hat.com" <david@...hat.com>,
        "akrowiak@...ux.ibm.com" <akrowiak@...ux.ibm.com>,
        "jjherne@...ux.ibm.com" <jjherne@...ux.ibm.com>,
        "pasic@...ux.ibm.com" <pasic@...ux.ibm.com>,
        "zhenyuw@...ux.intel.com" <zhenyuw@...ux.intel.com>,
        "Wang, Zhi A" <zhi.a.wang@...el.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4 2/2] vfio: no need to pass kvm pointer during device
 open

> From: Matthew Rosato <mjrosato@...ux.ibm.com>
> Sent: Saturday, February 4, 2023 5:50 AM
> 
> 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(-)

Reviewed-by: Yi Liu <yi.l.liu@...el.com>

Regards,
Yi Liu

> 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--;
>  	}
> --
> 2.39.1