linux-kernel - Re: [RFC PATCH v4 04/10] vfio/pci: let vfio_pci know number of vendor regions and vendor irqs

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Date:   Thu, 4 Jun 2020 17:25:15 +0200
From:   Cornelia Huck <cohuck@...hat.com>
To:     Yan Zhao <yan.y.zhao@...el.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        alex.williamson@...hat.com, zhenyuw@...ux.intel.com,
        zhi.a.wang@...el.com, kevin.tian@...el.com, shaopeng.he@...el.com,
        yi.l.liu@...el.com, xin.zeng@...el.com, hang.yuan@...el.com
Subject: Re: [RFC PATCH v4 04/10] vfio/pci: let vfio_pci know number of
 vendor regions and vendor irqs

On Sun, 17 May 2020 22:49:44 -0400
Yan Zhao <yan.y.zhao@...el.com> wrote:

> This allows a simpler VFIO_DEVICE_GET_INFO ioctl in vendor driver
> 
> Cc: Kevin Tian <kevin.tian@...el.com>
> Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
> ---
>  drivers/vfio/pci/vfio_pci.c         | 23 +++++++++++++++++++++--
>  drivers/vfio/pci/vfio_pci_private.h |  2 ++
>  include/linux/vfio.h                |  3 +++
>  3 files changed, 26 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> index 290b7ab55ecf..30137c1c5308 100644
> --- a/drivers/vfio/pci/vfio_pci.c
> +++ b/drivers/vfio/pci/vfio_pci.c
> @@ -105,6 +105,24 @@ void *vfio_pci_vendor_data(void *device_data)
>  }
>  EXPORT_SYMBOL_GPL(vfio_pci_vendor_data);
>  
> +int vfio_pci_set_vendor_regions(void *device_data, int num_vendor_regions)
> +{
> +	struct vfio_pci_device *vdev = device_data;
> +
> +	vdev->num_vendor_regions = num_vendor_regions;

Do we need any kind of sanity check here, in case this is called with a
bogus value?

> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(vfio_pci_set_vendor_regions);
> +
> +
> +int vfio_pci_set_vendor_irqs(void *device_data, int num_vendor_irqs)
> +{
> +	struct vfio_pci_device *vdev = device_data;
> +
> +	vdev->num_vendor_irqs = num_vendor_irqs;

Here as well.

> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(vfio_pci_set_vendor_irqs);
>  /*
>   * Our VGA arbiter participation is limited since we don't know anything
>   * about the device itself.  However, if the device is the only VGA device

(...)