linux-kernel - Re: [PATCH v10] vfio: ABI for mdev display dma-buf operation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <980a5c09-fa8a-255d-19ad-acf4bb29d271@nvidia.com>
Date:   Thu, 6 Jul 2017 19:31:34 +0530
From:   Kirti Wankhede <kwankhede@...dia.com>
To:     Tina Zhang <tina.zhang@...el.com>, <alex.williamson@...hat.com>,
        <kraxel@...hat.com>, <chris@...is-wilson.co.uk>,
        <zhenyuw@...ux.intel.com>, <zhiyuan.lv@...el.com>,
        <zhi.a.wang@...el.com>, <kevin.tian@...el.com>, <daniel@...ll.ch>
CC:     <intel-gfx@...ts.freedesktop.org>,
        <intel-gvt-dev@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v10] vfio: ABI for mdev display dma-buf operation



On 7/6/2017 3:59 AM, Tina Zhang wrote:
> Add VFIO_DEVICE_QUERY_GFX_PLANE ioctl command to let user mode query and
> get the plan and its related information.
> 
> The dma-buf's life cycle is handled by user mode and tracked by kernel.
> The returned fd in struct vfio_device_query_gfx_plane can be a new
> fd or an old fd of a re-exported dma-buf. Host User mode can check the
> value of fd and to see if it need to creat new resource according to the
> new fd or just use the existed resource related to the old fd.
> 
> Signed-off-by: Tina Zhang <tina.zhang@...el.com>
> 
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index ae46105..c92bc69 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -502,6 +502,36 @@ struct vfio_pci_hot_reset {
>  
>  #define VFIO_DEVICE_PCI_HOT_RESET	_IO(VFIO_TYPE, VFIO_BASE + 13)
>  
> +/**
> + * VFIO_DEVICE_QUERY_GFX_PLANE - _IOW(VFIO_TYPE, VFIO_BASE + 14,
> + *                           struct vfio_device_query_gfx_plane)
> + * Return: 0 on success, -errno on failure.
> + */
> +
> +struct vfio_device_gfx_plane_info {
> +	__u64 start;
> +	__u64 drm_format_mod;
> +	__u32 drm_format;
> +	__u32 width;
> +	__u32 height;
> +	__u32 stride;
> +	__u32 size;
> +	__u32 x_pos;
> +	__u32 y_pos;
> +};
> +

Above structure looks good to me.

> +struct vfio_device_query_gfx_plane {
> +	__u32 argsz;
> +	__u32 flags;
> +	struct vfio_device_gfx_plane_info plane_info;
> +	__u32 plane_type;
> +	__s32 fd; /* dma-buf fd */
> +	__u32 plane_id;
> +};
> +

It would be better to have comment here about what are expected values
for plane_type and plane_id.

Thanks,
Kirti

> +#define VFIO_DEVICE_QUERY_GFX_PLANE _IO(VFIO_TYPE, VFIO_BASE + 14)
> +
> +
>  /* -------- API for Type1 VFIO IOMMU -------- */
>  
>  /**
>